// File: src/TearSwap.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {Ownable} from "@oz/access/Ownable.sol";
import {Pausable} from "@oz/security/Pausable.sol";
import {IERC20} from "@oz/token/ERC20/IERC20.sol";
import {ITearToken} from "./interfaces/ITearToken.sol";

/**
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 * MMMMMKolk00kloXMWNK0KKNWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
 * MMMMMMXkxxddkXWKdoddxxxxkOKXXXNNWWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
 * MMMMMMMMMWWMMMXllO000KKKOkxxxxkkkkkkkkkO0KNWMMMMMMMMMMMMMMMMMMMMMMMMMM
 * MMMMMMMMMMMMMMKccO000000KKXNNNNNNNXXXK0OkkkkkkOKNMMMMMMMMMMMMMMMMMMMMM
 * MMMMMMMMMMMN0xocck0000000000KKKKXXXNNNNWWWWNX0kkkkOKWMMMMMMMMMMMMMMMMM
 * MMMMMMMMWXkoodkOOO00000000000000000000KKXXNNWWWMWXOxxk0NMMMMMMMMMMMMMM
 * MMMMMMWKxlokO000000000000000000000000000000KXWMMMMMMN0kxkKWMMMMMMMMMMM
 * MMMMMXxlok0000000000000000000000000000000000KNMMMMMMMMMN0xxONMMMMMMMMM
 * MMMW0ook0000000000000000000000000000000000000XWMMMMMMMMMMWKxdONMMMMMMM
 * MMWkldO000000000000000000000000000000000000000KXNWMMWNNWMMMWKxd0WMMMMM
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 * MMMMMWOolxO000000000000000000000000000000000000000000000000KNNNWKxdKMM
 * MMMMMMMNOoldO000000000000000000000000000000000000000000000KNNNXkdkNMMM
 * MMMMMMMMMN0dooxO00000000000000000000000000000000000000000KXKkxdkXWMMMM
 * MMMMMMMMMMMWXOxdooxkO0000000000000000000000000000000Okxxdxxxk0NMMMMMMM
 * MMMMMMMMMMMMMMMNKOxdddoooddxxxxkkkkkkkxxxxxddddoooodddxkOKNWMMMMMMMMMM
 * MMMMMMMMMMMMMMMMMMMWNKOxdollccccccccccccccccllodxk0KNWMMMMMMMMMMMMMMMM
 *
 * @title TearSwap
 * @custom:website www.descend.gg
 * @author Lozz (@lozzereth / www.allthingsweb3.com)
 * @notice Contract that enables allows the exchange of one ERC20 token
 *         for another, provided that there is a valid exchange rate.
 */
contract TearSwap is Pausable, Ownable {
    /// @notice Contract for $TEAR
    ITearToken public immutable tearContract;

    /// @notice Exchange rate for the swap
    mapping(IERC20 => uint256) public exchangeableErc20;

    /// @notice Destination address for the receiving tokens
    address public destinationAddress;

    /// @notice Expected amount of $TEAR is not the actual amount
    error InvalidSwap(uint256 expected, uint256 actual);

    constructor(ITearToken tearContract_) {
        tearContract = tearContract_;
        destinationAddress = 0x160cf78416e33a73C7f59043F12C8B6dA50d30D4;
    }

    /**
     * @notice Swap ERC20 tokens for $TEAR tokens
     * @param contract_ ERC20 contract to swap tokens
     * @param amount Amount of ERC20 coins
     */
    function swap(IERC20 contract_, uint256 amount) public whenNotPaused {
        uint256 exchangeRate = exchangeableErc20[contract_];
        if (exchangeRate == 0) {
            revert InvalidSwap(amount, 0);
        }
        uint256 tearAmount = amount / exchangeRate;
        uint256 slimeAmount = tearAmount * exchangeRate;
        if (slimeAmount != amount) {
            revert InvalidSwap(slimeAmount, amount);
        }
        IERC20(contract_).transferFrom(msg.sender, destinationAddress, amount);
        ITearToken(tearContract).eoaMint(msg.sender, tearAmount);
    }

    /**
     * @notice Set the exchange rate for ERC20 to $TEAR
     * @param address_ ERC20 contract address
     * @param rate Rate in wei
     */
    function setExchangeableERC20(IERC20 address_, uint256 rate)
        external
        onlyOwner
    {
        exchangeableErc20[address_] = rate;
    }

    /**
     * @notice Set the destination address for the tokens
     * @param destinationAddress_ Destination address for all the tokens
     */
    function setDestinationAddress(address destinationAddress_)
        external
        onlyOwner
    {
        destinationAddress = destinationAddress_;
    }

    /**
     * @notice Toggle paused state of the contract
     */
    function togglePause() external onlyOwner {
        if (paused()) {
            _unpause();
        } else {
            _pause();
        }
    }
}

// File: lib/openzeppelin-contracts/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: lib/openzeppelin-contracts/contracts/security/Pausable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// File: src/interfaces/ITearToken.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {IERC20Upgradeable} from "@oz-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/**
 * @title ITearToken
 * @author Lozz (@lozzereth / www.allthingsweb3.com)
 * @notice Interface for $TEAR Token.
 */
interface ITearToken is IERC20Upgradeable {
    /// @notice When an account is not an approved EOA
    error NonApprovedEOA(address address_);

    /**
     * @notice Allow the EOA to mint tokens
     * @param recipient Recipient to receive tokens
     * @param amount Amount of token to issue
     */
    function eoaMint(address recipient, uint256 amount) external;
}

// File: lib/openzeppelin-contracts/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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) {
        return msg.data;
    }
}

// File: lib/openzeppelin-contracts-upgradeable/contracts/token/ERC20/IERC20Upgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

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