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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {IGelatoChecker} from "../interfaces/IGelatoChecker.sol";
import {ICharity} from "../interfaces/ICharity.sol";

contract Charity is Ownable, ReentrancyGuard, IGelatoChecker, ICharity {
    /** state variables */
    bool public canWithdrawFunds = true;
    Category public charityCategory;
    address public automationBot = address(0);
    /** constants */
    address public constant ETH_ADDRESS = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);

    /** errors */
    error Charity__InsufficientBalance();
    error Charity__SendingFailed();
    error Charity__WithdrawalDisabled();
    error Charity__TokenAlreadyWhitelisted();
    error Charity__TokenNotWhitelisted();
    error Charity__MustBeAutomatedOrOwner(address caller);

    /**
     * mappings
     */
    mapping(address => bool) private whitelistedTokens;

    /**
     * arrays
     */
    address[] private tokenList;

    enum Category {
        Education,
        Health,
        Environment,
        Animals,
        HumanRights,
        Poverty,
        Other
    }

    modifier onlyAutomationOrOwner() {
        if (msg.sender != automationBot && msg.sender != owner()) {
            revert Charity__MustBeAutomatedOrOwner(msg.sender);
        }
        _;
    }

    /** events */
    event DonationWithdrawn(address indexed organization, address indexed token, uint256 amount);
    event TokenWhitelisted(address token);
    event TokenRemoved(address token);

    constructor(Category _category) Ownable(msg.sender) {
        charityCategory = _category;
    }

    /**
     * @dev Set the automation bot address.
     * @param _automation address of the automation bot
     */
    function setAutomationBot(address _automation) external onlyOwner {
        automationBot = _automation;
    }

    /**
     * @dev Check if the contract can withdraw funds.
     */
    function canWithdraw() external view returns (bool) {
        return canWithdrawFunds;
    }

    /**
     * @dev Set the status of the contract to withdraw funds.
     * @param status The status to set.
     */

    function setCanWithdraw(bool status) external onlyOwner {
        canWithdrawFunds = status;
    }

    /**
     * @dev Adds a token to the whitelist.
     * @param token The address of the token to add.
     */
    function addWhitelistedToken(address token) external onlyOwner {
        if (whitelistedTokens[token]) {
            revert Charity__TokenAlreadyWhitelisted();
        }

        whitelistedTokens[token] = true;
        tokenList.push(token);

        emit TokenWhitelisted(token);
    }

    /**
     * @dev Removes a token from the whitelist.
     * @param token The address of the token to remove.
     */
    function removeWhitelistedToken(address token) external onlyOwner {
        if (!whitelistedTokens[token]) {
            revert Charity__TokenNotWhitelisted();
        }

        whitelistedTokens[token] = false;

        for (uint256 i = 0; i < tokenList.length; i++) {
            if (tokenList[i] == token) {
                tokenList[i] = tokenList[tokenList.length - 1];
                tokenList.pop();
                break;
            }
        }

        emit TokenRemoved(token);
    }

    /**
     * @dev Returns the list of whitelisted ERC-20 tokens.
     */
    function getWhitelistedTokens() public view returns (address[] memory) {
        return tokenList;
    }

    /**
     * Automates funds distribution to the organization.
     * @return canExec - whether the contract can execute the withdrawal
     * @return execPayload - the payload to execute the withdrawal
     */
    function checker() external view returns (bool canExec, bytes memory execPayload) {
        address organization = owner();
        uint256 ethBalance = address(this).balance;

        if (!canWithdrawFunds) {
            return (false, abi.encode("Withdrawals Disabled"));
        }

        if (ethBalance > 0) {
            return (
                true,
                abi.encodeCall(
                    ICharity.withdrawToOrganization,
                    (ETH_ADDRESS, ethBalance, organization)
                )
            );
        }

        address[] memory tokens = getWhitelistedTokens();
        for (uint256 i = 0; i < tokens.length; i++) {
            uint256 tokenBalance = IERC20(tokens[i]).balanceOf(address(this));
            if (tokenBalance > 0) {
                return (
                    true,
                    abi.encodeCall(
                        ICharity.withdrawToOrganization,
                        (tokens[i], tokenBalance, organization)
                    )
                );
            }
        }

        return (false, abi.encode("No Funds Available"));
    }

    /**
     * @dev Check the balance of the contract.
     * @param token The address of the token to check the balance of.
     * @return The balance of the contract.
     */
    function balanceOf(address token) external view returns (uint256) {
        if (token == ETH_ADDRESS) {
            return address(this).balance;
        } else {
            return IERC20(token).balanceOf(address(this));
        }
    }

    /**
     * @dev Withdraw the donation from the contract.
     * @param token The address of the token to withdraw.
     * @param amount The amount to withdraw.
     * @param organization The address to send the funds to.
     */
    function withdrawToOrganization(
        address token,
        uint256 amount,
        address organization
    ) external onlyAutomationOrOwner nonReentrant {
        if (!canWithdrawFunds) {
            revert Charity__WithdrawalDisabled();
        }
        if (token == ETH_ADDRESS) {
            if (address(this).balance < amount) {
                revert Charity__SendingFailed();
            }

            (bool success, ) = organization.call{value: amount}("");
            if (!success) {
                revert Charity__SendingFailed();
            }
        } else {
            if (!whitelistedTokens[token]) {
                revert Charity__TokenNotWhitelisted();
            }
            bool sendSuccess = IERC20(token).transfer(organization, amount);
            if (!sendSuccess) {
                revert Charity__SendingFailed();
            }
        }
        emit DonationWithdrawn(organization, token, amount);
    }

    /**
     * @dev Fallback function to receive ETH donations.
     */
    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.8.0;

interface ICharity {
    function withdrawToOrganization(address token, uint256 amount, address organization) external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.8.0;

interface IGelatoChecker {
    function checker() external view returns (bool canExec, bytes memory execPayload);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"enum Charity.Category","name":"_category","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"Charity__InsufficientBalance","type":"error"},{"inputs":[{"internalType":"address","name":"caller","type":"address"}],"name":"Charity__MustBeAutomatedOrOwner","type":"error"},{"inputs":[],"name":"Charity__SendingFailed","type":"error"},{"inputs":[],"name":"Charity__TokenAlreadyWhitelisted","type":"error"},{"inputs":[],"name":"Charity__TokenNotWhitelisted","type":"error"},{"inputs":[],"name":"Charity__WithdrawalDisabled","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"organization","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"DonationWithdrawn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"}],"name":"TokenRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"}],"name":"TokenWhitelisted","type":"event"},{"inputs":[],"name":"ETH_ADDRESS","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"addWhitelistedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"automationBot","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"canWithdraw","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"canWithdrawFunds","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"charityCategory","outputs":[{"internalType":"enum Charity.Category","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checker","outputs":[{"internalType":"bool","name":"canExec","type":"bool"},{"internalType":"bytes","name":"execPayload","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getWhitelistedTokens","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"removeWhitelistedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_automation","type":"address"}],"name":"setAutomationBot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"status","type":"bool"}],"name":"setCanWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"organization","type":"address"}],"name":"withdrawToOrganization","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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