// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

interface IERC20 {
    function totalSupply() external view returns (uint256);

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

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

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

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

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

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

contract Context {
    // an instance of this contract, which should be used via inheritance.
    constructor() {}

    function _msgSender() internal view returns (address) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @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.
 */

interface AggregatorV3Interface {
    function decimals() external view returns (uint8);

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

    function version() external view returns (uint256);

    function getRoundData(uint80 _roundId)
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

interface IPresale {
    // function stake(address) external view returns (uint256);

    // function getListStaker() external view returns (address[] memory);

    // function getListBuyer() external view returns (address[] memory);

    // function getTotalStaked() external view returns (uint256);

    // function getStaker(address staker) external view returns (uint256);

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

    function stakeFromStakeContract(address _buyer, uint256 _amount)
        external
        returns (bool);

    function getAddress() external view returns (address);
}

contract Stake is Ownable {
    using SafeMath for uint256;
    address payable public _wallet; 
    IERC20 public  token; 
    IPresale presale; 
    uint256 public currentUpdateNumber;
    uint256 public lastUpdateBlockNumber;

    mapping(address => uint256) private rewards;
    mapping(address => uint256) private stakers;
    mapping(address => bool) isStaker;
    mapping(address => uint256) private lastestUpdatedNumberStaker;
    mapping(address => uint256) private lastestBlockNumberStaker;
    mapping(address => uint256) private timeStartStake;
    mapping(uint256 => UpdateNumber) private updateNumbers;
    uint256 public totalReward;
    uint256 public totalStaked;
    bool public inWithdrawToken = true;

    address[] public stakerAddressList;

    uint256 _rateAPY = 2628000; //60*60*24*365/12
    uint256 timeToHoldTokenStake = 2592000; // seconds
    uint256  public totalTokenRewardPerBlock = 160000000000000000000;

    struct UpdateNumber {
        uint256 blocknumber;
        uint256 totalStaked;
    }

    constructor(IERC20 _token, address payable wallet, IPresale _presale) {
        _wallet = wallet;
        token = _token;
        presale = _presale;
    }

    function setTotalTokenRewardPerBlock(uint256 _totalTokenRewardPerBlock)
        public
        onlyOwner
    {
        totalTokenRewardPerBlock = _totalTokenRewardPerBlock;
    }

    function setWallet(address payable wallet) public  onlyOwner{
        _wallet = wallet;
    }

    function getLastestUpdateNumberStaked(address staker)
        public
        view
        returns (uint256)
    {
        return lastestUpdatedNumberStaker[staker];
    }

    function getListStaker() public view returns (address[] memory) {
        return stakerAddressList;
    }

    function getStaker(address staker) public view returns (uint256) {
        return stakers[staker];
    }

    function getStakeale(address account) public view returns (uint256) {
        return presale.balanceOf(account);
    }

    function getReward(address _staker) public view returns (uint256) {
        return rewards[_staker];
    }

    function getTotalStaked() public view returns (uint256) {
        return totalStaked;
    }

    function getTotalTokenRewardPerBlock() public view returns (uint256) {
        return totalTokenRewardPerBlock;
    }

    function getTotalReward() public view returns (uint256) {
        return totalReward;
    }

    function getWallet() public view returns (address) {
        return _wallet;
    }

    function getUpdateNumber(uint256 updateNumber)
        public
        view
        returns (UpdateNumber memory)
    {
        return updateNumbers[updateNumber];
    }

    function getAddress() public view returns (address) {
        return address(this);
    }

    function getPresaleContract() public view returns (IPresale) {
        return presale;
    }

    function getPoolPercent(address staker) public view returns (uint256) {
        return (getStaker(staker) * (100)) / getTotalStaked();
    }

    function getStartTimeStaker(address staker) public view returns (uint256){
        return timeStartStake[staker];
    }
     function canUnStake(address staker) public view returns (bool){
        return block.timestamp - timeStartStake[staker] > timeToHoldTokenStake;
    }

     function getTimeToHoldTokenStaker() public view returns (uint256){
        return timeToHoldTokenStake;
    }

    function getAPY() public view returns (uint256) {
        return _rateAPY * totalTokenRewardPerBlock /  totalStaked;
    }

    function setPresaleAddress(IPresale presaleAdress) public onlyOwner {
        presale = presaleAdress;
    }

    function setInWithdrawToken(bool _inWithdrawToken) public onlyOwner {
       inWithdrawToken= _inWithdrawToken;
    }

    function setToken(IERC20 _token) public onlyOwner {
       token= _token;
    }

    function setTimeToHoldTokenStake(uint256 newTimeToHoldTokenStake) public onlyOwner {
        timeToHoldTokenStake = newTimeToHoldTokenStake;
    }

    function getRewards(address staker) public view returns (uint256) {
        uint256 blockNumber = block.number;
        uint256 updateNumberOfStaker = lastestUpdatedNumberStaker[staker];
        uint256 stakedOfAddress = stakers[staker];
        if(stakedOfAddress == 0 ){
            return 0;
        }
        uint256 blockNumberStaker = lastestBlockNumberStaker[staker];
        require(
            updateNumberOfStaker <= currentUpdateNumber,
            "address not stake"
        );
        uint256 rewardsOfAddress;

        if (lastestUpdatedNumberStaker[staker] == currentUpdateNumber) {
            rewardsOfAddress =
                (stakedOfAddress *
                    totalTokenRewardPerBlock *
                    (blockNumber - blockNumberStaker)) /
                totalStaked;
        } else {
            // uint256 lastTotalStakedInUpdateNumberSaved;
            UpdateNumber memory nextUpdateNumberOfStaker = updateNumbers[
                updateNumberOfStaker + 1
            ];
            // Step 1: Reward from blockNumberOfStaker to nextUpdateNumber
            rewardsOfAddress +=
                ((nextUpdateNumberOfStaker.blocknumber - blockNumberStaker) *
                    totalTokenRewardPerBlock *
                    stakedOfAddress) /
                updateNumbers[updateNumberOfStaker].totalStaked;

            //Step 2: Reward from nextUpdateNumber to currentUpdateNumber
            for (
                uint256 i = updateNumberOfStaker + 1;
                i < currentUpdateNumber;
                i++
            ) {
                uint256 totalStakedInUpdateNumber = updateNumbers[i]
                    .totalStaked;
                uint256 blockNumberInUpdateNumber = updateNumbers[i]
                    .blocknumber;
                uint256 blockNumberInNextUpdateNumber = updateNumbers[i + 1]
                    .blocknumber;
                rewardsOfAddress +=
                    ((stakedOfAddress * totalTokenRewardPerBlock) *
                        (blockNumberInNextUpdateNumber -
                            blockNumberInUpdateNumber)) /
                    totalStakedInUpdateNumber;
            }

            //Step 3: Reward from lastBlockNumber to currentBlockNumber
            rewardsOfAddress +=
                ((block.number -
                    updateNumbers[currentUpdateNumber].blocknumber) *
                    (stakedOfAddress * totalTokenRewardPerBlock)) /
                totalStaked;
        }

        return rewardsOfAddress;
    }

    function withdrawReward() public returns (bool) {
        return withdrawReward(msg.sender);
    }

    function tokenBalanceOfContract() view public returns (uint256){
        return token.balanceOf(address(this));
    }

    function withdrawReward(address staker) public returns (bool) {
        uint256 reward = getRewards(staker);
        require(
            token.balanceOf(address(this)) > reward,
            "Sold out reward token"
        );
        bool success = token.transfer(staker, reward);

        require(success, "Reward error");
        lastestUpdatedNumberStaker[staker] = currentUpdateNumber;
        lastestBlockNumberStaker[staker] = block.number;
         totalReward = totalReward.add(reward);
        return true;
    }

     function withdrawdAndStakeRewards(address staker) public returns (bool) {
        uint256 reward = getRewards(staker);
        require(stakeSuccess(staker, reward), "Withdraw and Stake error");
        return true;
    }

    function addStakerToList(address _staker) private {
        if (isStaker[_staker] == false) {
            stakerAddressList.push(_staker);
            isStaker[_staker] = true;
        }
    }

    function stake() public returns (bool) {
        require(msg.sender != address(0), "address is zero");
        uint256 amount = presale.balanceOf(msg.sender);
        require(amount > 0, "Amount must not zero");
        bool success = presale.stakeFromStakeContract(msg.sender, amount);
        require(success, "Stake error");
        if (stakers[msg.sender] > 0) {
            require(withdrawReward(msg.sender), "Withdraw old tokens error");
        }

        require(stakeSuccess(msg.sender, amount), "Stake error, check again");
        return true;
    }

    function stakeFromToken(uint256 _amount) public returns (bool) {
        require(msg.sender != address(0), "address is zero");
        require(_amount > 0, "Amount stake must > 0");
        uint256 balance = token.balanceOf(msg.sender);
        require(_amount <= balance, "Not enough tokens to stake");
        if (stakers[msg.sender] > 0) {
            require(withdrawReward(msg.sender), "Withdraw old tokens error");
        }
        require(
            token.transferFrom(msg.sender, _wallet, _amount),
            "Stake error"
        );

        require(stakeSuccess(msg.sender, _amount), "Stake error, check again");
        return true;
    }

    function unStake() public returns (bool){
        return unStake(msg.sender);
    }

    function unStake(address staker) private returns (bool)  {
        uint256 amountStaking = stakers[staker];
        require(amountStaking > 0, "Not have token to unstake");
        require( (block.timestamp - timeStartStake[staker] ) > timeToHoldTokenStake , "Not time to unstake yet");
        require(withdrawReward(staker), "Withdraw rewards before unstake error"); 
        token.transferFrom(_wallet, msg.sender, amountStaking);
        require(unStakeSuccess(staker,amountStaking), "Unstake fail");
        return true;
    }

    function stakeFromPresale(address buyer, uint256 amount)
        public
        returns (bool)
    {
        require(
            msg.sender == presale.getAddress(),
            "Only call from PresaleContract"
        );
        require(stakeSuccess(buyer, amount), "Stake error, check again");
        return true;
    }

    function stakeSuccess(address _staker, uint256 amount)
        private
        returns (bool)
    {
        uint256 blockNumber = block.number;
        stakers[_staker] = stakers[_staker].add(amount);
        totalStaked = totalStaked.add(amount);
        if (blockNumber - lastUpdateBlockNumber >= 300 || lastUpdateBlockNumber ==0) {
            lastUpdateBlockNumber = blockNumber;
            UpdateNumber memory updateNumber = UpdateNumber(
                blockNumber,
                totalStaked
            );
            currentUpdateNumber += 1;
            updateNumbers[currentUpdateNumber] = updateNumber;
        }
        lastestUpdatedNumberStaker[_staker] = currentUpdateNumber;
        lastestBlockNumberStaker[_staker] = block.number;
        timeStartStake[_staker] = block.timestamp;
        addStakerToList(_staker);
        return true;
    }

    function unStakeSuccess(address staker, uint256 amount) private  returns (bool) {
        stakers[staker] = stakers[staker].sub(amount);
        totalStaked = totalStaked.sub(amount);
        return true;
    }

    function withdraw() public onlyOwner {
        token.transfer(msg.sender, token.balanceOf(address(this)));
    }
}

{
  "compilationTarget": {
    "Stake.sol": "Stake"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}