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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Contracts
import { TToken_V1 } from "./TToken_V1.sol";
import { CONTROLLER } from "./data.sol";
import { ITTokenStrategy } from "./strategies/ITTokenStrategy.sol";

// Libraries
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @notice This contract represents a lending pool for an asset within Teller protocol.
 * @author [email protected]
 */
contract TToken_V2 is TToken_V1 {
    /**
     * @notice Called by the Teller Diamond contract when a loan has been taken out and requires funds.
     * @param recipient The account to send the funds to.
     * @param amount Funds requested to fulfil the loan.
     */
    function fundLoan(address recipient, uint256 amount)
        external
        override
        authorized(CONTROLLER, _msgSender())
    {
        // Call the strategy to ensure there is enough available funds to fund the loan
        _delegateStrategy(
            abi.encodeWithSelector(ITTokenStrategy.withdraw.selector, amount)
        );

        // Increase total borrowed amount
        s().totalBorrowed += amount;

        // Transfer tokens to recipient
        SafeERC20.safeTransfer(s().underlying, recipient, amount);
    }
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The defaut value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The defaut value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Library used to query support of an interface declared via {IERC165}.
 *
 * Note that these functions return the actual result of the query: they do not
 * `revert` if an interface is not supported. It is up to the caller to decide
 * what to do in these cases.
 */
library ERC165Checker {
    // As per the EIP-165 spec, no interface should ever match 0xffffffff
    bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff;

    /**
     * @dev Returns true if `account` supports the {IERC165} interface,
     */
    function supportsERC165(address account) internal view returns (bool) {
        // Any contract that implements ERC165 must explicitly indicate support of
        // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid
        return _supportsERC165Interface(account, type(IERC165).interfaceId) &&
            !_supportsERC165Interface(account, _INTERFACE_ID_INVALID);
    }

    /**
     * @dev Returns true if `account` supports the interface defined by
     * `interfaceId`. Support for {IERC165} itself is queried automatically.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) {
        // query support of both ERC165 as per the spec and support of _interfaceId
        return supportsERC165(account) &&
            _supportsERC165Interface(account, interfaceId);
    }

    /**
     * @dev Returns a boolean array where each value corresponds to the
     * interfaces passed in and whether they're supported or not. This allows
     * you to batch check interfaces for a contract where your expectation
     * is that some interfaces may not be supported.
     *
     * See {IERC165-supportsInterface}.
     *
     * _Available since v3.4._
     */
    function getSupportedInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool[] memory) {
        // an array of booleans corresponding to interfaceIds and whether they're supported or not
        bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length);

        // query support of ERC165 itself
        if (supportsERC165(account)) {
            // query support of each interface in interfaceIds
            for (uint256 i = 0; i < interfaceIds.length; i++) {
                interfaceIdsSupported[i] = _supportsERC165Interface(account, interfaceIds[i]);
            }
        }

        return interfaceIdsSupported;
    }

    /**
     * @dev Returns true if `account` supports all the interfaces defined in
     * `interfaceIds`. Support for {IERC165} itself is queried automatically.
     *
     * Batch-querying can lead to gas savings by skipping repeated checks for
     * {IERC165} support.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
        // query support of ERC165 itself
        if (!supportsERC165(account)) {
            return false;
        }

        // query support of each interface in _interfaceIds
        for (uint256 i = 0; i < interfaceIds.length; i++) {
            if (!_supportsERC165Interface(account, interfaceIds[i])) {
                return false;
            }
        }

        // all interfaces supported
        return true;
    }

    /**
     * @notice Query if a contract implements an interface, does not check ERC165 support
     * @param account The address of the contract to query for support of an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @return true if the contract at account indicates support of the interface with
     * identifier interfaceId, false otherwise
     * @dev Assumes that account contains a contract that supports ERC165, otherwise
     * the behavior of this method is undefined. This precondition can be checked
     * with {supportsERC165}.
     * Interface identification is specified in ERC-165.
     */
    function _supportsERC165Interface(address account, bytes4 interfaceId) private view returns (bool) {
        bytes memory encodedParams = abi.encodeWithSelector(IERC165(account).supportsInterface.selector, interfaceId);
        (bool success, bytes memory result) = account.staticcall{ gas: 30000 }(encodedParams);
        if (result.length < 32) return false;
        return success && abi.decode(result, (bool));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value < 2**128, "SafeCast: value doesn\'t fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value < 2**64, "SafeCast: value doesn\'t fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value < 2**32, "SafeCast: value doesn\'t fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value < 2**16, "SafeCast: value doesn\'t fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value < 2**8, "SafeCast: value doesn\'t fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128) {
        require(value >= -2**127 && value < 2**127, "SafeCast: value doesn\'t fit in 128 bits");
        return int128(value);
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64) {
        require(value >= -2**63 && value < 2**63, "SafeCast: value doesn\'t fit in 64 bits");
        return int64(value);
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32) {
        require(value >= -2**31 && value < 2**31, "SafeCast: value doesn\'t fit in 32 bits");
        return int32(value);
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16) {
        require(value >= -2**15 && value < 2**15, "SafeCast: value doesn\'t fit in 16 bits");
        return int16(value);
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8) {
        require(value >= -2**7 && value < 2**7, "SafeCast: value doesn\'t fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        require(value < 2**255, "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { AccessControlStorageLib, AccessControlStorage } from "../storage.sol";

abstract contract ReentryMods {
    modifier nonReentry(bytes32 id) {
        AccessControlStorage storage s = AccessControlStorageLib.store();
        require(!s.entered[id], "AccessControl: reentered");
        s.entered[id] = true;
        _;
        s.entered[id] = false;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { RolesMods } from "./RolesMods.sol";
import { RolesLib } from "./RolesLib.sol";
import { ADMIN } from "../../../shared/roles.sol";

contract RolesFacet is RolesMods {
    /**
     * @notice Checks if an account has a specific role.
     * @param role Encoding of the role to check.
     * @param account Address to check the {role} for.
     */
    function hasRole(bytes32 role, address account)
        external
        view
        returns (bool)
    {
        return RolesLib.hasRole(role, account);
    }

    /**
     * @notice Grants an account a new role.
     * @param role Encoding of the role to give.
     * @param account Address to give the {role} to.
     *
     * Requirements:
     *  - Sender must be role admin.
     */
    function grantRole(bytes32 role, address account)
        external
        authorized(ADMIN, msg.sender)
    {
        RolesLib.grantRole(role, account);
    }

    /**
     * @notice Removes a role from an account.
     * @param role Encoding of the role to remove.
     * @param account Address to remove the {role} from.
     *
     * Requirements:
     *  - Sender must be role admin.
     */
    function revokeRole(bytes32 role, address account)
        external
        authorized(ADMIN, msg.sender)
    {
        RolesLib.revokeRole(role, account);
    }

    /**
     * @notice Removes a role from the sender.
     * @param role Encoding of the role to remove.
     */
    function renounceRole(bytes32 role) external {
        RolesLib.revokeRole(role, msg.sender);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { AccessControlStorageLib, AccessControlStorage } from "../storage.sol";

library RolesLib {
    function s() private pure returns (AccessControlStorage storage) {
        return AccessControlStorageLib.store();
    }

    /**
     * @dev Emitted when `account` is granted `role`.
     */
    event RoleGranted(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    /**
     * @dev Emitted when `account` is revoked `role`.
     */
    event RoleRevoked(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    /**
     * @notice Checks if an account has a specific role.
     */
    function hasRole(bytes32 role, address account)
        internal
        view
        returns (bool)
    {
        return s().roles[role][account];
    }

    /**
     * @dev Gives an account a new role.
     * @dev Should only use when circumventing admin checking.
     * @dev If account already has the role, no event is emitted.
     * @param role Encoding of the role to give.
     * @param account Address to give the {role} to.
     */
    function grantRole(bytes32 role, address account) internal {
        if (hasRole(role, account)) return;
        s().roles[role][account] = true;
        emit RoleGranted(role, account, msg.sender);
    }

    /**
     * @dev Removes a role from an account.
     * @dev Should only use when circumventing admin checking.
     * @dev If account does not already have the role, no event is emitted.
     * @param role Encoding of the role to remove.
     * @param account Address to remove the {role} from.
     */
    function revokeRole(bytes32 role, address account) internal {
        if (!hasRole(role, account)) return;
        s().roles[role][account] = false;
        emit RoleRevoked(role, account, msg.sender);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { RolesLib } from "./RolesLib.sol";

abstract contract RolesMods {
    /**
     * @notice Requires that the {account} has {role}
     * @param role Encoding of the role to check.
     * @param account Address to check the {role} for.
     */
    modifier authorized(bytes32 role, address account) {
        require(
            RolesLib.hasRole(role, account),
            "AccessControl: not authorized"
        );
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

struct AccessControlStorage {
    mapping(bytes32 => mapping(address => bool)) roles;
    mapping(address => address) owners;
    mapping(bytes32 => bool) entered;
}

bytes32 constant ACCESS_CONTROL_POS = keccak256(
    "teller.access_control.storage"
);

library AccessControlStorageLib {
    function store() internal pure returns (AccessControlStorage storage s) {
        bytes32 pos = ACCESS_CONTROL_POS;
        assembly {
            s.slot := pos
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Contracts
import {
    ERC20Upgradeable
} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {
    RolesFacet
} from "../../contexts2/access-control/roles/RolesFacet.sol";

/**
 * @notice This contract acts as an interface for the Teller token (TToken).
 *
 * @author [email protected]
 */
abstract contract ITToken is ERC20Upgradeable, RolesFacet {
    /**
     * @notice This event is emitted when a user deposits tokens into the pool.
     */
    event Mint(
        address indexed sender,
        uint256 tTokenAmount,
        uint256 underlyingAmount
    );

    /**
     * @notice This event is emitted when a user withdraws tokens from the pool.
     */
    event Redeem(
        address indexed sender,
        uint256 tTokenAmount,
        uint256 underlyingAmount
    );

    /**
     * @notice This event is emitted when a loan has been taken out through the Teller Diamond.
     * @param recipient The address receiving the borrowed funds.
     * @param totalBorrowed The total amount being loaned out by the tToken.
     */
    event LoanFunded(address indexed recipient, uint256 totalBorrowed);

    /**
     * @notice This event is emitted when a loan has been repaid through the Teller Diamond.
     * @param sender The address making the payment to the tToken.
     * @param principlePayment The amount paid back towards the principle loaned out by the tToken.
     * @param interestPayment The amount paid back towards the interest owed to the tToken.
     */
    event LoanPaymentMade(
        address indexed sender,
        uint256 principlePayment,
        uint256 interestPayment
    );

    /**
     * @notice This event is emitted when a new investment management strategy has been set for a Teller token.
     * @param strategyAddress The address of the new strategy set for managing the underlying assets held by the tToken.
     * @param sender The address of the sender setting the token strategy.
     */
    event StrategySet(address strategyAddress, address indexed sender);

    /**
     * @notice This event is emitted when the platform restriction is switched
     * @param restriction Boolean representing the state of the restriction
     * @param investmentManager address of the investment manager flipping the switch
     */
    event PlatformRestricted(
        bool restriction,
        address indexed investmentManager
    );

    /**
     * @notice The token that is the underlying asset for this Teller token.
     * @return ERC20 token
     */
    function underlying() external view virtual returns (ERC20);

    /**
     * @notice The balance of an {account} denoted in underlying value.
     * @param account Address to calculate the underlying balance.
     * @return balance_ the balance of the account
     */
    function balanceOfUnderlying(address account)
        external
        virtual
        returns (uint256 balance_);

    /**
     * @notice It calculates the current exchange rate for a whole Teller Token based off the underlying token balance.
     * @return rate_ The current exchange rate.
     */
    function exchangeRate() external virtual returns (uint256 rate_);

    /**
     * @notice It calculates the total supply of the underlying asset.
     * @return totalSupply_ the total supply denoted in the underlying asset.
     */
    function totalUnderlyingSupply()
        external
        virtual
        returns (uint256 totalSupply_);

    /**
     * @notice It calculates the market state values across a given market.
     * @notice Returns values that represent the global state across the market.
     * @return totalSupplied Total amount of the underlying asset supplied.
     * @return totalBorrowed Total amount borrowed through loans.
     * @return totalRepaid The total amount repaid till the current timestamp.
     * @return totalInterestRepaid The total amount interest repaid till the current timestamp.
     * @return totalOnLoan Total amount currently deployed in loans.
     */
    function getMarketState()
        external
        virtual
        returns (
            uint256 totalSupplied,
            uint256 totalBorrowed,
            uint256 totalRepaid,
            uint256 totalInterestRepaid,
            uint256 totalOnLoan
        );

    /**
     * @notice Calculates the current Total Value Locked, denoted in the underlying asset, in the Teller Token pool.
     * @return tvl_ The value locked in the pool.
     *
     * Note: This value includes the amount that is on loan (including ones that were sent to EOAs).
     */
    function currentTVL() external virtual returns (uint256 tvl_);

    /**
     * @notice It validates whether supply to debt (StD) ratio is valid including the loan amount.
     * @param newLoanAmount the new loan amount to consider the StD ratio.
     * @return ratio_ The debt ratio for lending pool.
     */
    function debtRatioFor(uint256 newLoanAmount)
        external
        virtual
        returns (uint16 ratio_);

    /**
     * @notice Called by the Teller Diamond contract when a loan has been taken out and requires funds.
     * @param recipient The account to send the funds to.
     * @param amount Funds requested to fulfill the loan.
     */
    function fundLoan(address recipient, uint256 amount) external virtual;

    /**
     * @notice Called by the Teller Diamond contract when a loan has been repaid.
     * @param amount Funds deposited back into the pool to repay the principal amount of a loan.
     * @param interestAmount Interest value paid into the pool from a loan.
     */
    function repayLoan(uint256 amount, uint256 interestAmount) external virtual;

    /**
     * @notice Increase account supply of specified token amount.
     * @param amount The amount of underlying tokens to use to mint.
     * @return mintAmount_ the amount minted of the specified token
     */
    function mint(uint256 amount)
        external
        virtual
        returns (uint256 mintAmount_);

    /**
     * @notice Redeem supplied Teller tokens for underlying value.
     * @param amount The amount of Teller tokens to redeem.
     */
    function redeem(uint256 amount) external virtual;

    /**
     * @notice Redeem supplied underlying value.
     * @param amount The amount of underlying tokens to redeem.
     */
    function redeemUnderlying(uint256 amount) external virtual;

    /**
     * @notice Rebalances the funds controlled by Teller Token according to the current strategy.
     *
     * See {TTokenStrategy}.
     */
    function rebalance() external virtual;

    /**
     * @notice Sets a new strategy to use for balancing funds.
     * @param strategy Address to the new strategy contract. Must implement the {ITTokenStrategy} interface.
     * @param initData Optional data to initialize the strategy.
     *
     * Requirements:
     *  - Sender must have ADMIN role
     */
    function setStrategy(address strategy, bytes calldata initData)
        external
        virtual;

    /**
     * @notice Gets the strategy used for balancing funds.
     * @return address of the strategy contract
     */
    function getStrategy() external view virtual returns (address);

    /**
     * @notice Sets the restricted state of the platform.
     * @param state boolean value that resembles the platform's state
     */
    function restrict(bool state) external virtual;

    /**
     * @notice it initializes the Teller Token
     * @param admin address of the admin to the respective Teller Token
     * @param underlying address of the ERC20 token
     */
    function initialize(address admin, address underlying) external virtual;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Contracts
import { CONTROLLER, ADMIN, EXCHANGE_RATE_FACTOR } from "./data.sol";
import { ITTokenStrategy } from "./strategies/ITTokenStrategy.sol";
import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

// Utils
import { Address } from "@openzeppelin/contracts/utils/Address.sol";

// Interfaces
import { ITToken } from "./ITToken.sol";

// Libraries
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {
    ERC165Checker
} from "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol";
import { RolesLib } from "../../contexts2/access-control/roles/RolesLib.sol";
import {
    ReentryMods
} from "../../contexts2/access-control/reentry/ReentryMods.sol";
import { NumbersLib } from "../../shared/libraries/NumbersLib.sol";

// Storage
import "./token-storage.sol" as Storage;

/**
 * @notice This contract represents a lending pool for an asset within Teller protocol.
 * @author [email protected]
 */
contract TToken_V1 is ITToken, ReentryMods {
    function() pure returns (Storage.Store storage) internal constant s =
        Storage.store;

    /* Modifiers */

    /**
     * @notice Checks if the LP is restricted or the message sender has the CONTROLLER role.
     *
     * The LP being restricted means that only the Teller protocol may
     *  lend/borrow funds.
     */
    modifier notRestricted {
        require(
            !s().restricted || RolesLib.hasRole(CONTROLLER, _msgSender()),
            "Teller: platform restricted"
        );
        _;
    }

    /* Public Functions */

    /**
     * @notice it returns the decimal places of the respective TToken
     * @return decimals of the token
     */
    function decimals() public view override returns (uint8) {
        return s().decimals;
    }

    /**
     * @notice The token that is the underlying asset for this Teller token.
     * @return ERC20 token that is the underlying asset
     */
    function underlying() public view override returns (ERC20) {
        return s().underlying;
    }

    /**
     * @notice The balance of an {account} denoted in underlying value.
     * @param account Address to calculate the underlying balance.
     * @return balance_ the balance of the account
     */
    function balanceOfUnderlying(address account)
        public
        override
        returns (uint256)
    {
        return _valueInUnderlying(balanceOf(account), exchangeRate());
    }

    /**
     * @notice It calculates the current scaled exchange rate for a whole Teller Token based of the underlying token balance.
     * @return rate_ The current exchange rate, scaled by the EXCHANGE_RATE_FACTOR.
     */
    function exchangeRate() public override returns (uint256 rate_) {
        if (totalSupply() == 0) {
            return EXCHANGE_RATE_FACTOR;
        }

        rate_ = (currentTVL() * EXCHANGE_RATE_FACTOR) / totalSupply();
    }

    /**
     * @notice It calculates the total supply of the underlying asset.
     * @return totalSupply_ the total supply denoted in the underlying asset.
     */
    function totalUnderlyingSupply() public override returns (uint256) {
        bytes memory data =
            _delegateStrategy(
                abi.encodeWithSelector(
                    ITTokenStrategy.totalUnderlyingSupply.selector
                )
            );
        return abi.decode(data, (uint256));
    }

    /**
     * @notice It calculates the market state values across a given market.
     * @notice Returns values that represent the global state across the market.
     * @return totalSupplied Total amount of the underlying asset supplied.
     * @return totalBorrowed Total amount borrowed through loans.
     * @return totalRepaid The total amount repaid till the current timestamp.
     * @return totalInterestRepaid The total amount interest repaid till the current timestamp.
     * @return totalOnLoan Total amount currently deployed in loans.
     */
    function getMarketState()
        external
        override
        returns (
            uint256 totalSupplied,
            uint256 totalBorrowed,
            uint256 totalRepaid,
            uint256 totalInterestRepaid,
            uint256 totalOnLoan
        )
    {
        totalSupplied = totalUnderlyingSupply();
        totalBorrowed = s().totalBorrowed;
        totalRepaid = s().totalRepaid;
        totalInterestRepaid = s().totalInterestRepaid;
        totalOnLoan = totalBorrowed - totalRepaid;
    }

    /**
     * @notice Calculates the current Total Value Locked, denoted in the underlying asset, in the Teller Token pool.
     * @return tvl_ The value locked in the pool.
     *
     * Note: This value includes the amount that is on loan (including ones that were sent to EOAs).
     */
    function currentTVL() public override returns (uint256 tvl_) {
        tvl_ += totalUnderlyingSupply();
        tvl_ += s().totalBorrowed;
        tvl_ -= s().totalRepaid;
    }

    /**
     * @notice It validates whether supply to debt (StD) ratio is valid including the loan amount.
     * @param newLoanAmount the new loan amount to consider the StD ratio.
     * @return ratio_ The debt ratio for lending pool.
     */
    function debtRatioFor(uint256 newLoanAmount)
        external
        override
        returns (uint16 ratio_)
    {
        uint256 onLoan = s().totalBorrowed - s().totalRepaid;
        uint256 supplied = totalUnderlyingSupply() + onLoan;
        if (supplied > 0) {
            ratio_ = NumbersLib.ratioOf(onLoan + newLoanAmount, supplied);
        }
    }

    /**
     * @notice Called by the Teller Diamond contract when a loan has been taken out and requires funds.
     * @param recipient The account to send the funds to.
     * @param amount Funds requested to fulfil the loan.
     */
    function fundLoan(address recipient, uint256 amount)
        external
        virtual
        override
        authorized(CONTROLLER, _msgSender())
    {
        // If TToken is not holding enough funds to cover the loan, call the strategy to try to withdraw
        uint256 balance = s().underlying.balanceOf(address(this));
        if (balance < amount) {
            _delegateStrategy(
                abi.encodeWithSelector(
                    ITTokenStrategy.withdraw.selector,
                    amount - balance
                )
            );
        }

        // Increase total borrowed amount
        s().totalBorrowed += amount;

        // Transfer tokens to recipient
        SafeERC20.safeTransfer(s().underlying, recipient, amount);
        emit LoanFunded(recipient, amount);
    }

    /**
     * @notice Called by the Teller Diamond contract when a loan has been repaid.
     * @param amount Funds deposited back into the pool to repay the principal amount of a loan.
     * @param interestAmount Interest value paid into the pool from a loan.
     */
    function repayLoan(uint256 amount, uint256 interestAmount)
        external
        override
        authorized(CONTROLLER, _msgSender())
    {
        s().totalRepaid += amount;
        s().totalInterestRepaid += interestAmount;
        emit LoanPaymentMade(_msgSender(), amount, interestAmount);
    }

    /**
     * @dev The tToken contract needs to have been granted sufficient allowance to transfer the amount being used to mint.
     * @notice Deposit underlying token amount into LP and mint tokens.
     * @param amount The amount of underlying tokens to use to mint.
     * @return Amount of TTokens minted.
     */
    function mint(uint256 amount)
        external
        override
        notRestricted
        nonReentry(keccak256("MINT"))
        returns (uint256)
    {
        require(amount > 0, "Teller: cannot mint 0");
        require(
            amount <= s().underlying.balanceOf(_msgSender()),
            "Teller: insufficient underlying"
        );

        // Calculate amount of tokens to mint
        uint256 mintAmount = _valueOfUnderlying(amount, exchangeRate());

        require(mintAmount > 0, "Teller: amount to be minted cannot be 0");

        // Transfer tokens from lender
        SafeERC20.safeTransferFrom(
            s().underlying,
            _msgSender(),
            address(this),
            amount
        );

        // Mint Teller token value of underlying
        _mint(_msgSender(), mintAmount);

        emit Mint(_msgSender(), mintAmount, amount);

        return mintAmount;
    }

    /**
     * @notice Redeem supplied Teller tokens for underlying value.
     * @param amount The amount of Teller tokens to redeem.
     */
    function redeem(uint256 amount)
        external
        override
        nonReentry(keccak256("REDEEM"))
    {
        require(amount > 0, "Teller: cannot withdraw 0");
        require(
            amount <= balanceOf(_msgSender()),
            "Teller: redeem amount exceeds balance"
        );

        // Accrue interest and calculate exchange rate
        uint256 underlyingAmount = _valueInUnderlying(amount, exchangeRate());
        require(
            underlyingAmount > 0,
            "Teller: underlying teller token value to be redeemed cannot be 0"
        );

        require(
            underlyingAmount <= totalUnderlyingSupply(),
            "Teller: redeem ttoken lp not enough supply"
        );

        // Burn Teller Tokens and transfer underlying
        _redeem(amount, underlyingAmount);
    }

    /**
     * @notice Redeem supplied underlying value.
     * @param amount The amount of underlying tokens to redeem.
     */
    function redeemUnderlying(uint256 amount)
        external
        override
        nonReentry(keccak256("REDEEM"))
    {
        require(amount > 0, "Teller: cannot withdraw 0");
        require(
            amount <= totalUnderlyingSupply(),
            "Teller: redeem ttoken lp not enough supply"
        );

        // Accrue interest and calculate exchange rate
        uint256 rate = exchangeRate();
        uint256 tokenValue = _valueOfUnderlying(amount, rate) + 1;

        // Make sure sender has adequate balance
        require(
            tokenValue <= balanceOf(_msgSender()),
            "Teller: redeem amount exceeds balance"
        );

        // Burn Teller Tokens and transfer underlying
        _redeem(tokenValue, amount);
    }

    /**
     * @dev Redeem an {amount} of Teller Tokens and transfers {underlyingAmount} to the caller.
     * @param amount Total amount of Teller Tokens to burn.
     * @param underlyingAmount Total amount of underlying asset tokens to transfer to caller.
     *
     * This function should only be called by {redeem} and {redeemUnderlying} after the exchange
     * rate and both token values have been calculated to use.
     */
    function _redeem(uint256 amount, uint256 underlyingAmount) internal {
        // Burn Teller tokens
        _burn(_msgSender(), amount);

        // Make sure enough funds are available to redeem
        _delegateStrategy(
            abi.encodeWithSelector(
                ITTokenStrategy.withdraw.selector,
                underlyingAmount
            )
        );

        // Transfer funds back to lender
        SafeERC20.safeTransfer(s().underlying, _msgSender(), underlyingAmount);

        emit Redeem(_msgSender(), amount, underlyingAmount);
    }

    /**
     * @notice Rebalances the funds controlled by Teller Token according to the current strategy.
     *
     * See {TTokenStrategy}.
     */
    function rebalance() public override {
        _delegateStrategy(
            abi.encodeWithSelector(ITTokenStrategy.rebalance.selector)
        );
    }

    /**
     * @notice Sets or updates a strategy to use for balancing funds.
     * @param strategy Address to the new strategy contract. Must implement the {ITTokenStrategy} interface.
     * @param initData Optional data to initialize the strategy.
     *
     * Requirements:
     *  - Sender must have ADMIN role
     */
    function setStrategy(address strategy, bytes calldata initData)
        external
        override
        authorized(ADMIN, _msgSender())
    {
        require(
            ERC165Checker.supportsInterface(
                strategy,
                type(ITTokenStrategy).interfaceId
            ),
            "Teller: strategy does not support ITTokenStrategy"
        );
        s().strategy = strategy;
        if (initData.length > 0) {
            _delegateStrategy(initData);
        }
        emit StrategySet(strategy, _msgSender());
    }

    /**
     * @notice Gets the strategy used for balancing funds.
     * @return address of the strategy contract
     */
    function getStrategy() external view override returns (address) {
        return s().strategy;
    }

    /**
     * @notice Sets the restricted state of the tToken.
     * @param state boolean value that resembles the platform's state
     */
    function restrict(bool state)
        public
        override
        authorized(ADMIN, _msgSender())
    {
        s().restricted = state;
        emit PlatformRestricted(state, _msgSender());
    }

    /**
     * @notice it initializes the Teller Token
     * @param admin address of the admin to the respective Teller Token
     * @param underlying address of the ERC20 token
     *
     * Requirements:
     *  - Underlying token must implement `name`, `symbol` and `decimals`
     */
    function initialize(address admin, address underlying)
        external
        override
        initializer
    {
        require(
            Address.isContract(msg.sender),
            "Teller: controller not contract"
        );
        require(
            Address.isContract(underlying),
            "Teller: underlying token not contract"
        );

        RolesLib.grantRole(CONTROLLER, msg.sender);
        RolesLib.grantRole(ADMIN, admin);

        s().underlying = ERC20(underlying);
        __ERC20_init(
            string(abi.encodePacked("Teller ", s().underlying.name())),
            string(abi.encodePacked("t", s().underlying.symbol()))
        );
        s().decimals = s().underlying.decimals();
        // Platform restricted by default
        s().restricted = true;
    }

    /**
     * @notice it retrieves the value of the underlying token
     * @param amount the amount of tokens to calculate the value of
     * @param rate the exchangeRate() to divide with the amount * exchange_rate_factor
     * @return value_ the underlying value of the token amount
     */
    function _valueOfUnderlying(uint256 amount, uint256 rate)
        internal
        pure
        returns (uint256 value_)
    {
        value_ = (amount * EXCHANGE_RATE_FACTOR) / rate;
    }

    /**
     * @notice it retrieves the value in the underlying tokens
     *
     */
    function _valueInUnderlying(uint256 amount, uint256 rate)
        internal
        pure
        returns (uint256 value_)
    {
        value_ = (amount * (rate)) / EXCHANGE_RATE_FACTOR;
    }

    /**
     * @notice Delegates data to call on the strategy contract.
     * @param callData Data to call the strategy contract with.
     *
     */
    function _delegateStrategy(bytes memory callData)
        internal
        returns (bytes memory)
    {
        return Address.functionDelegateCall(s().strategy, callData);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Role ID used to pull funds for the asset it manages (i.e. TellerDiamond)
bytes32 constant CONTROLLER = keccak256("CONTROLLER");
// Role ID used to for accounts to call special methods that modify its state
bytes32 constant ADMIN = keccak256("ADMIN");

uint256 constant EXCHANGE_RATE_FACTOR = 1e18;

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface ITTokenStrategy {
    /**
     * @notice This event is emitted when the underlying assets are rebalanced as directed by the set investment strategy.
     * @param strategyName The name of the strategy being rebalanced - example: "CompoundStrategy_1"
     * @param sender The address of the sender rebalancing the token strategy.
     */
    event StrategyRebalanced(
        string indexed strategyName,
        address indexed sender
    );

    /**
     * @notice This event is emitted when the underlying assets are rebalanced as directed by the set investment strategy.
     * @param strategyName The name of the strategy being rebalanced - example: "CompoundStrategy_1"
     * @param investmentAsset The address of the investible asset / protocol being used to leverage the underlying assets.
     * @param sender The address of the sender rebalancing the token strategy.
     */
    event StrategyInitialized(
        string indexed strategyName,
        address investmentAsset,
        address indexed sender
    );

    /**
     * @notice it returns the total supply of an underlying asset in a Teller token.
     * @return uint256 the underlying supply
     */
    function totalUnderlyingSupply() external returns (uint256);

    /**
     * @notice it rebalances the underlying asset held by the Teller Token.
     */
    function rebalance() external;

    /**
     * @notice it withdraws amount of tokens in a pool
     * @param amount amount to withdraw
     */

    function withdraw(uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

struct Store {
    // The underlying asset of the tToken
    ERC20 underlying;
    // The address of the investment strategy contract managing the underlying assets
    address strategy;
    // The total amount of the underlying asset currently out in disbursed loans
    uint256 totalBorrowed;
    // The total amount of the underlying asset currently repaid from disbursed loans
    uint256 totalRepaid;
    // The total amount of the underlying asset currently repaid in the form of interest owed from disbursed loans
    uint256 totalInterestRepaid;
    // The decimals of the underlying ERC20 asset
    uint8 decimals;
    // The status of token investment restriction
    bool restricted;
}

bytes32 constant POSITION = keccak256("ttoken.storage.position");

/**
 * @notice it saves the Store struct in a hashed slot
 */
function store() pure returns (Store storage s_) {
    bytes32 position = POSITION;
    assembly {
        s_.slot := position
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Libraries
import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol";

/**
 * @dev Utility library for uint256 numbers
 *
 * @author [email protected]
 */
library NumbersLib {
    /**
     * @dev It represents 100% with 2 decimal places.
     */
    uint256 internal constant ONE_HUNDRED_PERCENT = 10000;

    /**
     * @notice Returns a percentage value of a number.
     * @param self The number to get a percentage of.
     * @param percentage The percentage value to calculate with 2 decimal places (10000 = 100%).
     */
    function percent(uint256 self, uint16 percentage)
        internal
        pure
        returns (uint256)
    {
        return (self * uint256(percentage)) / ONE_HUNDRED_PERCENT;
    }

    function percent(int256 self, uint256 percentage)
        internal
        pure
        returns (int256)
    {
        return (self * int256(percentage)) / int256(ONE_HUNDRED_PERCENT);
    }

    /**
     * @notice it returns the absolute number of a specified parameter
     * @param self the number to be returned in it's absolute
     * @return the absolute number
     */
    function abs(int256 self) internal pure returns (uint256) {
        return self >= 0 ? uint256(self) : uint256(-1 * self);
    }

    /**
     * @notice Returns a ratio percentage of {num1} to {num2}.
     * @param num1 The number used to get the ratio for.
     * @param num2 The number used to get the ratio from.
     * @return Ratio percentage with 2 decimal places (10000 = 100%).
     */
    function ratioOf(uint256 num1, uint256 num2)
        internal
        pure
        returns (uint16)
    {
        return
            num2 == 0
                ? 0
                : SafeCast.toUint16((num1 * ONE_HUNDRED_PERCENT) / num2);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @dev the roles for the user to assign, revoke and check in functions
 */
bytes32 constant ADMIN = keccak256("ADMIN");
bytes32 constant PAUSER = keccak256("PAUSER");
bytes32 constant AUTHORIZED = keccak256("AUTHORIZED");

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"totalBorrowed","type":"uint256"}],"name":"LoanFunded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"principlePayment","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"interestPayment","type":"uint256"}],"name":"LoanPaymentMade","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"tTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"underlyingAmount","type":"uint256"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"restriction","type":"bool"},{"indexed":true,"internalType":"address","name":"investmentManager","type":"address"}],"name":"PlatformRestricted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"tTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"underlyingAmount","type":"uint256"}],"name":"Redeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"strategyAddress","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"StrategySet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOfUnderlying","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentTVL","outputs":[{"internalType":"uint256","name":"tvl_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newLoanAmount","type":"uint256"}],"name":"debtRatioFor","outputs":[{"internalType":"uint16","name":"ratio_","type":"uint16"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"exchangeRate","outputs":[{"internalType":"uint256","name":"rate_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"fundLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getMarketState","outputs":[{"internalType":"uint256","name":"totalSupplied","type":"uint256"},{"internalType":"uint256","name":"totalBorrowed","type":"uint256"},{"internalType":"uint256","name":"totalRepaid","type":"uint256"},{"internalType":"uint256","name":"totalInterestRepaid","type":"uint256"},{"internalType":"uint256","name":"totalOnLoan","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getStrategy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"admin","type":"address"},{"internalType":"address","name":"underlying","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rebalance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"redeem","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"redeemUnderlying","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"interestAmount","type":"uint256"}],"name":"repayLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"state","type":"bool"}],"name":"restrict","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"strategy","type":"address"},{"internalType":"bytes","name":"initData","type":"bytes"}],"name":"setStrategy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalUnderlyingSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"underlying","outputs":[{"internalType":"contract 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