// SPDX-License-Identifier: MIT
pragma solidity =0.8.24;

import "./interfaces/IERC20.sol";
import "./Owned.sol";
import "./externals/openzeppelin/ReentrancyGuard.sol";

contract SynthFaucet is Owned, ReentrancyGuard {
    IERC20 public synthToken;

    uint256 public constant FAUCET_LIMIT = 1000000 * 10 ** 18;
    mapping(address => uint256) private _faucets;

    event TokensRequested(address indexed user, uint256 amount);
    event SynthTokenUpdated(address indexed oldToken, address indexed newToken);

    constructor(address _synthToken) Owned(msg.sender) {
        require(_synthToken != address(0), "Invalid token address");
        synthToken = IERC20(_synthToken);
    }

    /**
     * @dev Allows users to request SYNTH tokens.
     * Requirements:
     * - Faucet should have enough balance to fulfill the request.
     * - Users should not exceed the total limit allowed (`FAUCET_LIMIT`).
     */
    function faucetToken(uint256 _amount) external {
        require(_amount > 0, "Amount must be greater than zero");
        require(_faucets[msg.sender] + _amount <= FAUCET_LIMIT, "Request exceeds faucet limit");

        uint256 currentBalance = synthToken.balanceOf(address(this));
        require(currentBalance >= _amount, "Faucet balance is insufficient");

        _faucets[msg.sender] += _amount;
        synthToken.transfer(msg.sender, _amount);

        emit TokensRequested(msg.sender, _amount);
    }

    /**
     * @dev Updates the SYNTH token address.
     * Can only be called by the owner.
     * Emits a `SynthTokenUpdated` event.
     */
    function updateSynthToken(address _newSynthToken) external onlyOwner {
        require(_newSynthToken != address(0), "Invalid token address");
        address oldToken = address(synthToken);
        synthToken = IERC20(_newSynthToken);

        emit SynthTokenUpdated(oldToken, _newSynthToken);
    }

    /**
     * @dev Emergency withdrawal for the owner to recover remaining tokens.
     * Should only be used if the faucet is deprecated.
     */
    function emergencyWithdraw(uint256 _amount) external onlyOwner {
        require(_amount <= synthToken.balanceOf(address(this)), "Amount exceeds balance");
        synthToken.transfer(owner, _amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.24;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied 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.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor() {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.24;

interface IERC20 {
    // ERC20 Optional Views
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    // Views
    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    // Mutative functions
    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    // Events
    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.24;

contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(
            msg.sender == nominatedOwner,
            "You must be nominated before you can accept ownership"
        );
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner() {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}

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

[{"inputs":[{"internalType":"address","name":"_synthToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldToken","type":"address"},{"indexed":true,"internalType":"address","name":"newToken","type":"address"}],"name":"SynthTokenUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"TokensRequested","type":"event"},{"inputs":[],"name":"FAUCET_LIMIT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"emergencyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"faucetToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"nominateNewOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nominatedOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"synthToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newSynthToken","type":"address"}],"name":"updateSynthToken","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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