// 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 v5.1.0) (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 ^0.8.13;

// @author: yungwknd

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract Stanker is ReentrancyGuard {
    struct Stake {
        uint256 unlockTimestamp;
        uint256 amount;
        address erc20;
        address recipient;
        bool distributed;
    }

    mapping(uint256 => Stake) public stakes;
    uint256[] allStakeIds;

    mapping(address => uint256[]) public userStakesToReceive;
    mapping(address => uint256[]) public userStakesToSend;

    function getAllStakes() public view returns (Stake[] memory, uint256[] memory) {
        Stake[] memory allStakes = new Stake[](allStakeIds.length);
        for (uint256 i = 0; i < allStakeIds.length; i++) {
            allStakes[i] = stakes[allStakeIds[i]];
        }
        return (allStakes, allStakeIds);
    }

    function getReceivingStakes(address user) public view returns (Stake[] memory, uint256[] memory) {
        Stake[] memory userStakesToReturn = new Stake[](userStakesToReceive[user].length);
        uint256[] memory userStakeIdsToReturn = new uint256[](userStakesToReceive[user].length);
        for (uint256 i = 0; i < userStakesToReceive[user].length; i++) {
            userStakesToReturn[i] = stakes[userStakesToReceive[user][i]];
            userStakeIdsToReturn[i] = userStakesToReceive[user][i];
        }
        return (userStakesToReturn, userStakeIdsToReturn);
    }

    function getSendingStakes(address user) public view returns (Stake[] memory, uint256[] memory) {
        Stake[] memory userStakesToReturn = new Stake[](userStakesToSend[user].length);
        uint256[] memory userStakeIdsToReturn = new uint256[](userStakesToSend[user].length);
        for (uint256 i = 0; i < userStakesToSend[user].length; i++) {
            userStakesToReturn[i] = stakes[userStakesToSend[user][i]];
            userStakeIdsToReturn[i] = userStakesToSend[user][i];
        }

        return (userStakesToReturn, userStakeIdsToReturn);
    }

    function withdrawStake(uint256 id) public nonReentrant {
        Stake memory stake = stakes[id];
        require(block.timestamp >= stake.unlockTimestamp, "Stake not yet unlocked");
        require(msg.sender == stake.recipient, "You are not the recipient of this stake");
        require(!stake.distributed, "Stake already distributed");
        IERC20(stake.erc20).transfer(stake.recipient, stake.amount);
        stakes[id].distributed = true;
    }

    function createStake(uint256 id, uint256 unlockTimestamp, uint256 amount, address erc20, address recipient) public nonReentrant {
        // Check for existing stake
        require(stakes[id].unlockTimestamp == 0, "Stake already exists");
        require(unlockTimestamp != 0, "Cannot have no unlockTimestamp");

        // Take in the amount of tokens to stake
        IERC20(erc20).transferFrom(msg.sender, address(this), amount);

        Stake memory stake = Stake(unlockTimestamp, amount, erc20, recipient, false);

        // Create the stake
        stakes[id] = stake;
        userStakesToReceive[recipient].push(id);
        userStakesToSend[msg.sender].push(id);
        allStakeIds.push(id);
    }
}

{
  "compilationTarget": {
    "src/Stanker.sol": "Stanker"
  },
  "evmVersion": "cancun",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": [
    ":@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    ":@uniswap/v3-core/=lib/v3-core/",
    ":erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    ":forge-std/=lib/forge-std/src/",
    ":halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts/",
    ":v3-core/=lib/v3-core/"
  ]
}