// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/security/ReentrancyGuard.sol

// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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 Returns the address of the current owner.
     */
    function owner() public view virtual 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 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);
    }
}

// File: contracts/PYRstake.sol


pragma solidity ^0.8.7;



interface IERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function getOwner() external view returns (address);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);
    function allowance(address _owner, address spender)
        external
        view
        returns (uint256);
    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
    );
}

interface IERC721 {
    function balanceOf(address owner) external view returns (uint256 balance);
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function walletOfOwner(address _owner) external view returns (uint256[] memory);
}

contract HydraStake is Ownable, ReentrancyGuard {
    
    struct user{
        uint256 id;
        uint256 totalStakedBalance;
        uint256 totalClaimedRewards;
        uint256 createdTime;
    }

    struct stakePool{
        uint256 id;
        uint256 duration;
        uint256 multiplier; // Used for dynamic APY
        uint256 APY; // Used for fixed APY
        uint256 withdrawalFee;
        uint256 unstakePenalty;
        uint256 stakedTokens;
        uint256 claimedRewards;
        uint256 status; //1: created, 2: active, 3: cancelled
        address creator;
        uint256 createdTime;
    }

    stakePool[] public stakePoolArray;

    struct userStake{
        uint256 id;
        uint256 stakePoolId;
	    uint256 stakeBalance;
    	uint256 totalClaimedRewards;
    	uint256 lastClaimedTime;
        address tokenAddress;
        uint256 status; //0 : Unstaked, 1 : Staked
        address owner;
    	uint256 createdTime;
        uint256 unlockTime;
        uint256 lockDuration;
    }

    userStake[] public userStakeArray;


    mapping (uint256 => stakePool) public stakePoolsById;
    mapping (uint256 => userStake) public userStakesById;

    mapping (address => uint256[]) public userStakeIds;
    mapping (address => userStake[]) userStakeLists;
   
    mapping (address => user) users;

    uint256 public totalStakedBalance;
    uint256 public totalClaimedBalance;
    uint256 public magnitude = 100000000;

    uint256 public userIndex;
    uint256 public poolIndex;
    uint256 public stakeIndex;

    bool public dynamicApy = false;
    bool public unstakePenalty = true; 
    bool public isPaused = false;

    address baseTokenAddress = 0x1165Ce434377D9E0CafF79F9562B6cFC1C3d8Ea3;
    IERC20 stakeToken = IERC20(baseTokenAddress);

    address rewardTokensAddress = 0x1165Ce434377D9E0CafF79F9562B6cFC1C3d8Ea3;
    IERC20 rewardToken = IERC20(rewardTokensAddress);
    

    modifier unpaused {
      require(isPaused == false);
      _;
    }

    modifier paused {
      require(isPaused == true);
      _;
    }

    constructor() {   
        
        addStakePool(
            1, // Duration in days
            0, // Multiplier -- applicable for dynamic APY pools only
            365, // APY % -- applicable for fixed APY pools only
            0, // Withdrawal Fee %
            2 // Unstaking Penalty %
        );

        
        addStakePool(
            7,
            0, 
            450,
            0,
            2
        );

        addStakePool(
            30,
            0,
            550,
            0,
            2
        );

         addStakePool(
            90,
            0,
            640,
            0,
            2
        );
        
    }
    
    function addStakePool(uint256 _duration, uint256 _multiplier, uint256 _apy, uint256 _withdrawalFee, uint256 _unstakePenalty ) public onlyOwner returns (bool){
    
        stakePool memory stakePoolDetails;
        
        stakePoolDetails.id = poolIndex;
        stakePoolDetails.duration = _duration;
        stakePoolDetails.multiplier = _multiplier;
        stakePoolDetails.APY = _apy;
        stakePoolDetails.withdrawalFee = _withdrawalFee;
        stakePoolDetails.unstakePenalty = _unstakePenalty;
        stakePoolDetails.creator = msg.sender;
        stakePoolDetails.createdTime = block.timestamp;
       
        stakePoolArray.push(stakePoolDetails);
        stakePoolsById[poolIndex++] = stakePoolDetails;

        return true;
    }

    function getFixedAPY(uint256 _stakePoolId) public view returns (uint256){
        stakePool memory stakePoolDetails = getStakePoolDetailsById(_stakePoolId);
        return stakePoolDetails.APY;
    }

    function getDynamicAPY(uint256 _stakePoolId) public view returns (uint256) {
        uint256 rewardTokenBalance = rewardToken.balanceOf(address(this));
        stakePool memory stakePoolDetails = getStakePoolDetailsById(_stakePoolId);
        uint256 poolMultiplier = stakePoolDetails.multiplier;
        uint256 totalPoolsAPY = rewardTokenBalance / totalStakedBalance;
        return (totalPoolsAPY * poolMultiplier);
    }

    function getDynamicAPYOfAllPools() public view returns (uint256[] memory) {
        
        uint256[] memory allPoolAPY = new uint256[](stakePoolArray.length);
        uint256 rewardTokenBalance = rewardToken.balanceOf(address(this));

        stakePool memory stakePoolDetails;
        uint256 poolMultiplier;
        uint256 totalPoolsAPY;
        uint256 stakePoolAPY;

        for(uint256 i = 0; i < stakePoolArray.length; i++ ){
            stakePoolDetails = stakePoolArray[i];
            poolMultiplier = stakePoolDetails.multiplier;
            totalPoolsAPY = rewardTokenBalance / totalStakedBalance;
            stakePoolAPY = totalPoolsAPY * poolMultiplier;
            allPoolAPY[i] = stakePoolAPY;
        }

        return (allPoolAPY);
    }

    function getDPR(uint256 _stakePoolId) public view returns (uint256){
        uint256 apy;
        uint256 dpr;

        if(dynamicApy == false){
            apy = getFixedAPY(_stakePoolId);
            dpr = (apy * magnitude) / 360;
        }else{
            apy = getDynamicAPY(_stakePoolId);
            dpr = (apy * magnitude) / 360;
        }

        return dpr;
    }

    function getStakePoolDetailsById(uint256 _stakePoolId) public view returns(stakePool memory){
        return (stakePoolArray[_stakePoolId]);
    }

    function getElapsedTime(uint256 _stakeId) public view returns(uint256){
        userStake memory userStakeDetails = userStakesById[_stakeId];
        if(userStakeDetails.lastClaimedTime == 0){
            uint256 lapsedDays = ((block.timestamp - userStakeDetails.createdTime)/3600)/24; //3600 seconds per hour so: lapsed days = lapsed time * (3600seconds /24hrs)
            return lapsedDays;
        }else {
            uint256 lapsedDays = ((block.timestamp - userStakeDetails.lastClaimedTime)/3600)/24; //3600 seconds per hour so: lapsed days = lapsed time * (3600seconds /24hrs)
            return lapsedDays;
        }
    }

    function stake(uint256 _stakePoolId, uint256 _amount) nonReentrant unpaused external returns (bool) {
        stakePool memory stakePoolDetails = stakePoolsById[_stakePoolId];

        require(stakeToken.allowance(msg.sender, address(this)) >= _amount,'Tokens not approved for transfer');
        
        bool success = stakeToken.transferFrom(msg.sender, address(this), _amount);
        require(success, "Token Transfer failed.");
        
        userStake memory userStakeDetails;

        uint256 userStakeid = stakeIndex++;
        userStakeDetails.id = userStakeid;
        userStakeDetails.stakePoolId = _stakePoolId;
        userStakeDetails.stakeBalance = _amount;
        userStakeDetails.status = 1;
        userStakeDetails.owner = msg.sender;
        userStakeDetails.createdTime = block.timestamp;
        userStakeDetails.unlockTime = block.timestamp + (stakePoolDetails.duration * 86400) ;
        userStakeDetails.lockDuration = stakePoolDetails.duration;
        userStakeDetails.lastClaimedTime = block.timestamp;
        
        userStakesById[userStakeid] = userStakeDetails;
        
        uint256[] storage userStakeIdsArray = userStakeIds[msg.sender];
        
        userStakeIdsArray.push(userStakeid);
        userStakeArray.push(userStakeDetails);
        
        userStake[] storage userStakeList = userStakeLists[msg.sender];
        userStakeList.push(userStakeDetails);

        user memory userDetails = users[msg.sender];

        if(userDetails.id == 0){
            userDetails.id = block.timestamp;
            userDetails.createdTime = block.timestamp;
        }

        userDetails.totalStakedBalance = userDetails.totalStakedBalance + _amount;

        users[msg.sender] = userDetails;

        stakePoolDetails.stakedTokens = stakePoolDetails.stakedTokens + _amount;
        
        stakePoolsById[_stakePoolId] = stakePoolDetails;

        totalStakedBalance = totalStakedBalance + _amount;

        return true;
    }

    function unstake(uint256 _stakeId) nonReentrant unpaused external returns (bool){
        userStake memory userStakeDetails = userStakesById[_stakeId];
        uint256 stakePoolId = userStakeDetails.stakePoolId;
        uint256 stakeBalance = userStakeDetails.stakeBalance;
        
        require(userStakeDetails.owner == msg.sender,"You don't own this stake");
        
        stakePool memory stakePoolDetails = stakePoolsById[stakePoolId];

        if(isStakeLocked(_stakeId)){
            stakeBalance = stakeBalance - (stakeBalance * stakePoolDetails.unstakePenalty)/(100);
        }

        uint256 unstakableBalance = stakeBalance;
        userStakeDetails.stakeBalance = 0;
        userStakeDetails.status = 0;

        userStakesById[_stakeId] = userStakeDetails;

        stakePoolDetails.stakedTokens = stakePoolDetails.stakedTokens - stakeBalance;

        userStakesById[_stakeId] = userStakeDetails;

        user memory userDetails = users[msg.sender];
        userDetails.totalStakedBalance =   userDetails.totalStakedBalance - unstakableBalance;

        users[msg.sender] = userDetails;
        stakePoolsById[stakePoolId] = stakePoolDetails;

        totalStakedBalance =  totalStakedBalance - unstakableBalance;

        require(stakeToken.balanceOf(address(this)) >= unstakableBalance, "Insufficient contract stake token balance");
        
        bool success = stakeToken.transfer(msg.sender, unstakableBalance);
        require(success, "Token Transfer failed.");

        return true;
    }

    function isStakeLocked(uint256 _stakeId) public view returns (bool) {
        userStake memory userStakeDetails = userStakesById[_stakeId];
        if(block.timestamp < userStakeDetails.unlockTime){
            return true;
        }else{
            return false;
        }
    }

    function getStakePoolIdByStakeId(uint256 _stakeId) public view returns(uint256){
        userStake memory userStakeDetails = userStakesById[_stakeId];
        return userStakeDetails.stakePoolId;
    }

    function getUserStakeIds() public view returns(uint256[] memory){
        return (userStakeIds[msg.sender]);
    }

    function getUserStakeIdsByAddress(address _userAddress) public view returns(uint256[] memory){
         return(userStakeIds[_userAddress]);
    }

    function getUserStakeDetailsByStakeId(uint256 _stakeId) public view returns(userStake memory, stakePool memory){ 
        userStake memory userStakeDetails = userStakeArray[_stakeId];
        uint256 userStakePoolId = userStakeDetails.stakePoolId;
        return (userStakeArray[_stakeId], stakePoolArray[userStakePoolId]);
    }

    function getUserAllStakeDetails() public view returns(userStake[] memory){
        return (userStakeLists[msg.sender]);
    }

    function getUserAllStakeDetailsByAddress(address _userAddress) public view returns(userStake[] memory){
        return (userStakeLists[_userAddress]);
    }

    function getUserStakeOwner(uint256 _stakeId) public view returns (address){
        userStake memory userStakeDetails = userStakesById[_stakeId];
        return userStakeDetails.owner;
    }

    function getUserStakeBalance(uint256 _stakeId) public view returns (uint256){
        userStake memory userStakeDetails = userStakesById[_stakeId];
        return userStakeDetails.stakeBalance;
    }
    
    function getUnclaimedRewards(uint256 _stakeId) public view returns (uint256){
        userStake memory userStakeDetails = userStakeArray[_stakeId];
        uint256 stakePoolId = userStakeDetails.stakePoolId;

        stakePool memory stakePoolDetails = stakePoolsById[stakePoolId];
        uint256 stakeApr = getDPR(stakePoolDetails.id);

        uint applicableRewards = (userStakeDetails.stakeBalance * stakeApr)/(magnitude * 100); //divided by 10000 to handle decimal percentages like 0.1%
        uint unclaimedRewards = (applicableRewards * getElapsedTime(_stakeId));

        return unclaimedRewards; 
    }

    function getTotalUnclaimedRewards() public view returns (uint256){
        uint256[] memory stakeIds = getUserStakeIds();
        uint256 totalUnclaimedRewards;
        for(uint256 i = 0; i < stakeIds.length; i++) {
            totalUnclaimedRewards += getUnclaimedRewards(stakeIds[i]);
        }
        return totalUnclaimedRewards;
    }

    function getTotalUnclaimedRewardsByAddress(address _userAddress) public view returns (uint256){
        uint256[] memory stakeIds = getUserStakeIdsByAddress(_userAddress);
        uint256 totalUnclaimedRewards;
        for(uint256 i = 0; i < stakeIds.length; i++) {
            totalUnclaimedRewards += getUnclaimedRewards(stakeIds[i]);
        }
        return totalUnclaimedRewards;
    }

    
    function getAllPoolDetails() public view returns(stakePool[] memory){
        return (stakePoolArray);
    }

    function claimRewards(uint256 _stakeId) nonReentrant unpaused external returns (bool){
        address userStakeOwner = getUserStakeOwner(_stakeId);
        require(userStakeOwner == msg.sender,"You don't own this stake");

        userStake memory userStakeDetails = userStakesById[_stakeId];

        require(((block.timestamp - userStakeDetails.lastClaimedTime)/3600) > 24,"You already claimed rewards today");
        
        uint256 unclaimedRewards = getUnclaimedRewards(_stakeId);
        
        userStakeDetails.totalClaimedRewards = userStakeDetails.totalClaimedRewards + unclaimedRewards;
        userStakeDetails.lastClaimedTime = block.timestamp;
        userStakesById[_stakeId] = userStakeDetails;

        totalClaimedBalance += unclaimedRewards;

        user memory userDetails = users[msg.sender];
        userDetails.totalClaimedRewards  +=  unclaimedRewards;

        users[msg.sender] = userDetails;

        require(rewardToken.balanceOf(address(this)) >= unclaimedRewards, "Insufficient contract reward token balance");

        bool success = rewardToken.transfer(msg.sender, unclaimedRewards);
        require(success, "Token Transfer failed.");

        return true;
    }

    function getUserDetails() external view returns (user memory){
        user memory userDetails = users[msg.sender];
        return(userDetails);
    }

    function getUserDetailsByAddress(address _userAddress) external view returns (user memory){
        user memory userDetails = users[_userAddress];
        return(userDetails);
    }

    function pauseStake() public onlyOwner(){
        isPaused = true;
    }

    function unpauseStake() public onlyOwner(){
        isPaused = false;
    }

    function emergencyUnstake() public paused {
        userStake[] memory userAllStakes = userStakeLists[msg.sender];
        
        for (uint256 i = 0; i < userAllStakes.length; i++){
            uint256 _stakeId = userAllStakes[i].id;
            userStake memory userStakeDetails = userStakesById[_stakeId];
            uint256 stakePoolId = userStakeDetails.stakePoolId;
            uint256 stakeBalance = userStakeDetails.stakeBalance;
            
            require(userStakeDetails.owner == msg.sender,"You don't own this stake");
            
            stakePool memory stakePoolDetails = stakePoolsById[stakePoolId];

            uint256 unstakableBalance = stakeBalance;
            userStakeDetails.stakeBalance = 0;
            userStakeDetails.status = 0;

            userStakesById[_stakeId] = userStakeDetails;

            stakePoolDetails.stakedTokens = stakePoolDetails.stakedTokens - stakeBalance;

            userStakesById[_stakeId] = userStakeDetails;

            user memory userDetails = users[msg.sender];
            userDetails.totalStakedBalance =   userDetails.totalStakedBalance - unstakableBalance;

            users[msg.sender] = userDetails;
            stakePoolsById[stakePoolId] = stakePoolDetails;

            totalStakedBalance =  totalStakedBalance - unstakableBalance;

            require(stakeToken.balanceOf(address(this)) >= unstakableBalance, "Insufficient contract stake token balance");
            
            bool success = stakeToken.transfer(msg.sender, unstakableBalance);
            require(success, "Token Transfer failed.");
        }

    }

    function withdrawContractETH() public onlyOwner paused returns(bool){
        (bool success, ) = msg.sender.call{value: address(this).balance}("");
        require(success, "Transfer failed.");

        return true;
    }

    function withdrawContractRewardTokens() public onlyOwner paused returns(bool){
        //IERC20 token = IERC20(baseTokenAddress);

        bool success = rewardToken.transfer(msg.sender, rewardToken.balanceOf(address(this)));
        require(success, "Token Transfer failed.");

        return true;
    }

    receive() external payable {
    }
}