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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.23;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract StakeManager is Ownable, ReentrancyGuard {
    IERC20 public maskToken;

    struct Pool {
        // pointAccStartBlock and pointAccEndBlock are set for external reading and
        // do not participate in business logic on contract.
        uint256 pointAccStartBlock;
        uint256 pointAccEndBlock;
        bool unlocked;
        bool stakingEnabled;
    }

    struct UserInfo {
        uint256 stakedAmount;
        // uint8 is enought for 256 pools
        uint8 poolId;
    }

    Pool[] public pools;
    mapping(address => UserInfo) public userInfos;

    uint8 public currentPoolId = 0;

    event Staked(address indexed account, uint8 indexed poolId, uint256 stakedAmount);
    event StakeChanged(address indexed account, uint8 indexed fromPoolId, uint8 indexed toPoolId);
    event unstaked(address indexed account, uint8 indexed poolId, uint256 unStakedAmount);
    event PoolCreated(
        uint8 indexed poolId, uint256 pointAccStartBlock, uint256 pointAccEndBlock, bool unlocked, bool stakingEnabled
    );
    event PoolUpdated(
        uint8 indexed poolId, uint256 pointAccStartBlock, uint256 pointAccEndBlock, bool unlocked, bool stakingEnabled
    );
    event CurrentPoolIdChanged(uint8 indexed fromPoolId, uint8 indexed toPoolId);

    constructor(address _maskToken) Ownable() {
        maskToken = IERC20(_maskToken);
    }

    function depositAndLock(uint256 _amount) public nonReentrant {
        Pool storage pool = pools[currentPoolId];

        require(pool.stakingEnabled, "Staking is disabled for this pool");

        require(maskToken.transferFrom(msg.sender, address(this), _amount), "Transfer failed");
        userInfos[msg.sender].stakedAmount += _amount;
        // depositAndLock will always stake to currentPoolId
        // it will init userInfos[msg.sender].poolId for the first time
        // it will change userInfos[msg.sender].poolId to currntPoolId(which means new pool) when
        //   user deposit after prev pool unlocked
        userInfos[msg.sender].poolId = currentPoolId;

        emit Staked(msg.sender, currentPoolId, _amount);
    }

    function withdraw(uint256 _amount) public nonReentrant {
        Pool storage pool = pools[userInfos[msg.sender].poolId];

        require(pool.unlocked, "Pool is locked");
        require(userInfos[msg.sender].stakedAmount >= _amount, "Insufficient balance");

        userInfos[msg.sender].stakedAmount -= _amount;
        require(maskToken.transfer(msg.sender, _amount), "Transfer failed");

        emit unstaked(msg.sender, userInfos[msg.sender].poolId, _amount);
    }

    function changePool() public nonReentrant {
        uint8 fromPoolId = userInfos[msg.sender].poolId;
        Pool storage fromPool = pools[userInfos[msg.sender].poolId];
        Pool storage toPool = pools[currentPoolId];

        require(fromPoolId != currentPoolId, "No need to change");
        require(toPool.stakingEnabled, "Staking is disabled for this pool");
        require(fromPool.unlocked, "From pool is locked");
        require(userInfos[msg.sender].stakedAmount > 0, "No staked amount");

        userInfos[msg.sender].poolId = currentPoolId;

        emit StakeChanged(msg.sender, fromPoolId, currentPoolId);
    }

    function createPool(Pool calldata _pool) public onlyOwner {
        pools.push(_pool);
        emit PoolCreated(
            uint8(pools.length - 1),
            _pool.pointAccStartBlock,
            _pool.pointAccEndBlock,
            _pool.unlocked,
            _pool.stakingEnabled
        );
    }

    function updatePool(uint8 _poolId, Pool calldata _pool) public onlyOwner {
        Pool storage pool = pools[_poolId];
        pool.pointAccStartBlock = _pool.pointAccStartBlock;
        pool.pointAccEndBlock = _pool.pointAccEndBlock;
        pool.unlocked = _pool.unlocked;
        pool.stakingEnabled = _pool.stakingEnabled;

        emit PoolUpdated(
            _poolId, _pool.pointAccStartBlock, _pool.pointAccEndBlock, _pool.unlocked, _pool.stakingEnabled
        );
    }

    function updateCurrentPoolId(uint8 _poolId) public onlyOwner {
        uint8 fromPoolId = currentPoolId;
        Pool storage fromPool = pools[fromPoolId];

        require(fromPool.unlocked, "From pool is locked");

        Pool storage pool = pools[_poolId];
        require(pool.stakingEnabled, "Staking is disabled for this pool");

        currentPoolId = _poolId;

        emit CurrentPoolIdChanged(fromPoolId, _poolId);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. 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 {
        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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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 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;

    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
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // 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: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

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

{
  "remappings": [
    "forge-std/=node_modules/forge-std/src/",
    "ds-test/=node_modules/ds-test/src/",
    "murky/=lib/murky/src/",
    "@openzeppelin/contracts/=node_modules/@openzeppelin/contracts/",
    "@ensdomains/=node_modules/@ensdomains/",
    "@nomiclabs/=node_modules/@nomiclabs/",
    "@solidity-parser/=node_modules/@solidity-parser/",
    "erc4626-tests/=lib/murky/lib/openzeppelin-contracts/lib/erc4626-tests/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "hardhat-deploy/=node_modules/hardhat-deploy/",
    "hardhat/=node_modules/hardhat/",
    "openzeppelin-contracts/=lib/murky/lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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