// File: IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}

// File: IOwnershipTransferrable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

interface IOwnershipTransferrable {
    function transferOwnership(address owner) external;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
}

// File: IVybeStake.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "./IOwnershipTransferrable.sol";

interface IVybeStake is IOwnershipTransferrable {
    event StakeIncreased(address indexed staker, uint256 amount);
    event StakeDecreased(address indexed staker, uint256 amount);
    event Rewards(
        address indexed staker,
        uint256 mintage,
        uint256 developerFund
    );
    event MelodyAdded(address indexed melody);
    event MelodyRemoved(address indexed melody);

    function vybe() external returns (address);

    function totalStaked() external returns (uint256);

    function staked(address staker) external returns (uint256);

    function lastClaim(address staker) external returns (uint256);

    function addMelody(address melody) external;

    function removeMelody(address melody) external;

    function upgrade(address owned, address upgraded) external;
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "./IOwnershipTransferrable.sol";

abstract contract Ownable is IOwnershipTransferrable {
    address private _owner;

    constructor(address owner) public {
        _owner = owner;
        emit OwnershipTransferred(address(0), _owner);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function transferOwnership(address newOwner) external override onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

abstract contract ReentrancyGuard {
    bool private _entered;

    modifier noReentrancy() {
        require(!_entered);
        _entered = true;
        _;
        _entered = false;
    }
}

// File: SafeMath.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

// File: Vybe.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "./SafeMath.sol";
import "./Ownable.sol";

contract Vybe is Ownable {
    using SafeMath for uint256;

    uint256 constant UINT256_MAX = ~uint256(0);

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

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

    constructor() public Ownable(msg.sender) {
        _name = "TestVybe";
        _symbol = "TVYBE";
        _decimals = 18;

        _totalSupply = 2000000 * 1e18;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    function name() external view returns (string memory) {
        return _name;
    }

    function symbol() external view returns (string memory) {
        return _symbol;
    }

    function decimals() external view returns (uint8) {
        return _decimals;
    }

    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender)
        external
        view
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function transfer(address recipient, uint256 amount)
        external
        returns (bool)
    {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool) {
        _transfer(sender, recipient, amount);
        if (_allowances[msg.sender][sender] != UINT256_MAX) {
            _approve(
                sender,
                msg.sender,
                _allowances[sender][msg.sender].sub(amount)
            );
        }
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        external
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].add(addedValue)
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        external
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].sub(subtractedValue)
        );
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        require(sender != address(0));
        require(recipient != address(0));

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal {
        require(owner != address(0));
        require(spender != address(0));

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function mint(address account, uint256 amount) external onlyOwner {
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    function burn(uint256 amount) external returns (bool) {
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(msg.sender, address(0), amount);
        return true;
    }
}

// File: VybeStake.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "./SafeMath.sol";
import "./IOwnershipTransferrable.sol";
import "./ReentrancyGuard.sol";
import "./Vybe.sol";
import "./IERC20.sol";

contract VybeStake is ReentrancyGuard, Ownable {
    using SafeMath for uint256;

    uint256 constant UINT256_MAX = ~uint256(0);
    uint256 constant MONTH = 30 days;
    uint256 constant DAY = 24 hours;
    // =============Vybe===================//
    Vybe private _VYBE;

    bool private _dated;
    bool private _migrated;
    uint256 _deployedAt;

    uint256 _totalStaked;

    mapping(address => uint256) private _staked;
    mapping(address => uint256) private _lastClaim;
    mapping(address => uint256) private _lastSignificantDecrease;
    mapping(address => uint256) private _lastDecrease;

    address private _developerFund;

    event StakeIncreased(address indexed staker, uint256 amount);
    event StakeDecreased(address indexed staker, uint256 amount);
    event Rewards(
        address indexed staker,
        uint256 mintage,
        uint256 developerFund
    );
    event MelodyAdded(address indexed melody);
    event MelodyRemoved(address indexed melody);

    // ========== Vybe LP =========== //
    IERC20 private _LP;
    mapping(address => uint256) private _lpStaked;
    mapping(address => uint256) private _lpLastClaim;
    uint256 _totalLpStaked;
    uint256 totalLpStakedUnrewarded;
    uint256 startOfPeriod;
    uint256 monthlyLPReward;

    event StakeIncreasedLP(address indexed lpStaker, uint256 amount);
    event StakeDecreasedLP(address indexed lpStaker, uint256 amount);
    event RewardsLP(address indexed staker, uint256 mintage);

    constructor(address vybe, address lpvybe) public Ownable(msg.sender) {
        _VYBE = Vybe(vybe);
        _developerFund = msg.sender;
        _deployedAt = block.timestamp;
        _LP = IERC20(lpvybe);
        monthlyLPReward = _VYBE.totalSupply().div(10000).mul(16);
        // resets the start date
        startOfPeriod = block.timestamp;
    }

    //===============VYBE=================//
    function upgradeDevelopmentFund(address fund) external onlyOwner {
        _developerFund = fund;
    }

    function vybe() external view returns (address) {
        return address(_VYBE);
    }

    function totalStaked() external view returns (uint256) {
        return _totalStaked;
    }

    function migrate(address previous, address[] memory people) external {
        require(!_migrated);
        for (uint256 i = 0; i < people.length; i++) {
            uint256 staked = VybeStake(previous).staked(people[i]);
            uint256 lastClaim = VybeStake(previous).lastClaim(people[i]);
            _staked[people[i]] = staked;
            _totalStaked = _totalStaked.add(staked);
            _lastClaim[people[i]] = lastClaim;
            emit StakeIncreased(people[i], staked);
        }
        require(
            _VYBE.transferFrom(
                previous,
                address(this),
                _VYBE.balanceOf(previous)
            )
        );
        _migrated = true;
    }

    function staked(address staker) external view returns (uint256) {
        return _staked[staker];
    }

    function lastClaim(address staker) external view returns (uint256) {
        return _lastClaim[staker];
    }

    function rewardAvailable(address staker) external view returns (bool) {
        if (block.timestamp.sub(_lastClaim[staker]) >= DAY) {
            return true;
        } else {
            return false;
        }
    }

    function increaseStake(uint256 amount) external {
        require(!_dated);

        require(_VYBE.transferFrom(msg.sender, address(this), amount));
        _totalStaked = _totalStaked.add(amount);
        _lastClaim[msg.sender] = block.timestamp;
        _staked[msg.sender] = _staked[msg.sender].add(amount);
        emit StakeIncreased(msg.sender, amount);
    }

    function decreaseStake(uint256 amount) external {
        _staked[msg.sender] = _staked[msg.sender].sub(amount);
        _totalStaked = _totalStaked.sub(amount);
        require(_VYBE.transfer(address(msg.sender), amount));
        uint256 cutoffPercentage = 5;
        // checks is the amount they are withdrawing in more than 5% and if it has been over a month since they withdrew less than 5%
        if (
            amount >= _staked[msg.sender] * (cutoffPercentage.div(10)) &&
            _lastDecrease[msg.sender] > MONTH
        ) {
            _lastSignificantDecrease[msg.sender] = block.timestamp;
            _lastDecrease[msg.sender] = block.timestamp;
            // If they withdraw more than 5% or withdraw less then 5% twice in 1 month then their tier is reset
        } else {
            _lastClaim[msg.sender] = block.timestamp;

            emit StakeDecreased(msg.sender, amount);
        }
    }

    // New function for calculating profit
    function _calculateStakerReward(address staker)
        private
        view
        returns (uint256)
    {
        uint256 interestPerMonth;
        uint256 StakerReward;
        uint256 claimFrom = _lastClaim[staker];
        if (_lastSignificantDecrease[staker] > _lastClaim[staker]) {
            claimFrom = _lastSignificantDecrease[staker];
        }
        uint256 stakedTime = block.timestamp.sub(claimFrom);

        // Platinum Tier
        if (stakedTime > MONTH.mul(6)) {
            // in basis points (10% APY)
            interestPerMonth = 28;
            // Gold Tier
        } else if (stakedTime > MONTH.mul(3)) {
            // in basis points (8% APY)
            interestPerMonth = 22;
            // Silver tier
        } else {
            // in basis points (5% APY)
            interestPerMonth = 14;
        }
        if (stakedTime >= DAY) {
            stakedTime = stakedTime.div(DAY);
            uint256 interest = interestPerMonth.mul(stakedTime);

            StakerReward = _staked[staker].div(1e5).mul(interest);
        }

        return StakerReward;
    }

    function calculateRewards(address staker) public view returns (uint256) {
        return _calculateStakerReward(staker);
    }

    function claimRewards() external noReentrancy {
        require(!_dated);
        require(_staked[msg.sender] > 0, "user has 0 staked");

        uint256 stakerReward = _calculateStakerReward(msg.sender);
        uint256 devPiece = stakerReward.div(100);

        stakerReward = stakerReward - devPiece;

        require(stakerReward > 0);
        _lastClaim[msg.sender] = block.timestamp;

        _staked[msg.sender] = _staked[msg.sender].add(stakerReward);
        _totalStaked = _totalStaked.add(stakerReward);
        _VYBE.mint(address(this), stakerReward);
        _VYBE.mint(_developerFund, devPiece);

        emit Rewards(msg.sender, stakerReward, devPiece);
    }

    function addMelody(address melody) external onlyOwner {
        _VYBE.approve(melody, UINT256_MAX);
        emit MelodyAdded(melody);
    }

    function removeMelody(address melody) external onlyOwner {
        _VYBE.approve(melody, 0);
        emit MelodyRemoved(melody);
    }

    function upgrade(address owned, address upgraded) external onlyOwner {
        _dated = true;
        IOwnershipTransferrable(owned).transferOwnership(upgraded);
    }

    function totalLpStaked() external view returns (uint256) {
        return _totalLpStaked;
    }

    function increaseLpStake(uint256 amount) external {
        require(!_dated);

        require(
            _LP.transferFrom(msg.sender, address(this), amount),
            "Can't transfer"
        );
        _totalLpStaked = _totalLpStaked.add(amount);
        _lpLastClaim[msg.sender] = block.timestamp;
        _lpStaked[msg.sender] = _lpStaked[msg.sender].add(amount);
        emit StakeIncreasedLP(msg.sender, amount);
    }

    function decreaseLpStake(uint256 amount) external {
        _lpStaked[msg.sender] = _lpStaked[msg.sender].sub(amount);
        _totalLpStaked = _totalLpStaked.sub(amount);
        require(_LP.transfer(address(msg.sender), amount));

        _lpLastClaim[msg.sender] = block.timestamp;
        emit StakeDecreasedLP(msg.sender, amount);
    }

    function lpBalanceOf(address account) public view returns (uint256) {
        return _lpStaked[account];
    }

    function timeLeftTillNextClaim() public view returns (uint256) {
        return block.timestamp.sub(startOfPeriod).sub(30 days);
    }

    function _monthlyLPReward() public view returns (uint256) {
        return monthlyLPReward;
    }

    function _totalLpStakedUnrewarded() public view returns (uint256) {
        return totalLpStakedUnrewarded;
    }

    function claimLpRewards() external noReentrancy updateLPReward() {
        require(_lpLastClaim[msg.sender] < startOfPeriod);
        uint256 lpRewardPerToken = monthlyLPReward.div(totalLpStakedUnrewarded);
        uint256 lpReward = lpRewardPerToken.mul(_lpStaked[msg.sender]);
        totalLpStakedUnrewarded = totalLpStakedUnrewarded.sub(
            _lpStaked[msg.sender]
        );
        monthlyLPReward = monthlyLPReward.sub(lpReward);
        _VYBE.mint(msg.sender, lpReward);
        emit RewardsLP(msg.sender, lpReward);
    }

    modifier updateLPReward() {
        if (block.timestamp.sub(startOfPeriod) > 30 days) {
            monthlyLPReward = _VYBE.totalSupply().div(10000).mul(41);
            startOfPeriod = block.timestamp;
            totalLpStakedUnrewarded = _totalLpStaked;
        }
        _;
    }
}