// File: /Users/elenaderymova/projects/work/4irelabs/options-market-vaults/contracts/HodlerVault.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.7.1;
import "@openzeppelin/contracts/access/Ownable.sol";
import "./facades/IERC20.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IWETH.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";

contract HodlerVault is Ownable {

    /** Emitted when purchaseLP() is called and LP tokens minted */
    event LPQueued(
        address hodler,
        uint amount,
        uint eth,
        uint osmTokens,
        uint timeStamp
    );

    /** Emitted when claimLP() is called */
    event LPClaimed(
        address hodler,
        uint amount,
        uint timestamp,
        uint donation
    );

    struct LPbatch {
        uint amount;
        uint timestamp;
        bool claimed;
    }

    struct HodlerVaultConfig {
        IERC20 osmToken;
        IUniswapV2Router02 uniswapRouter;
        IUniswapV2Pair tokenPair;
        address weth;
        uint32 stakeDuration;
        uint8 donationShare; //0-100
    }

    bool private locked;
    bool public forceUnlock;

    modifier lock {
        require(!locked, "HodlerVault: reentrancy violation");
        locked = true;
        _;
        locked = false;
    }

    HodlerVaultConfig public config;
    //Front end can loop through this and inspect if enough time has passed
    mapping(address => LPbatch[]) public lockedLP;
    mapping(address => uint) public queueCounter;

    receive() external payable {}

    function maxTokensToInvest() public view returns (uint) {
        uint totalETH = address(this).balance;
        if (totalETH == 0) {
            return 0;
        }

        uint osmMaxAllowed;

        (uint reserve1, uint reserve2,) = config.tokenPair.getReserves();

        if (address(config.osmToken) < address(config.weth)) {
            osmMaxAllowed = config.uniswapRouter.quote(
                totalETH,
                reserve2,
                reserve1
            );
        } else {
            osmMaxAllowed = config.uniswapRouter.quote(
                totalETH,
                reserve1,
                reserve2
            );
        }

        return osmMaxAllowed;
    }


    function getLockedLP(address hodler, uint position)
        public
        view
        returns (
            address,
            uint,
            uint,
            bool
        )
    {
        LPbatch memory batch = lockedLP[hodler][position];
        return (hodler, batch.amount, batch.timestamp, batch.claimed);
    }

    function lockedLPLength(address hodler) public view returns (uint) {
        return lockedLP[hodler].length;
    }

    function getStakeDuration() public view returns (uint) {
        return forceUnlock ? 0 : config.stakeDuration;
    }

    function seed(
        uint32 duration,
        IERC20 osmToken,
        address uniswapPair,
        address uniswapRouter
    ) public onlyOwner {
        config.osmToken = osmToken;
        config.uniswapRouter = IUniswapV2Router02(uniswapRouter);
        config.tokenPair = IUniswapV2Pair(uniswapPair);
        config.weth = config.uniswapRouter.WETH();
        setParameters(duration, 0);
    }

    function setParameters(uint32 duration, uint8 donationShare)
        public
        onlyOwner
    {
        require(
            donationShare <= 100,
            "HodlerVault: donation share % between 0 and 100"
        );

        config.stakeDuration = duration * 1 days;
        config.donationShare = donationShare;
    }


    function purchaseLP(uint amount) public lock {
        require(amount > 0, "HodlerVault: OSM required to mint LP");
        require(config.osmToken.balanceOf(msg.sender) >= amount, "HodlerVault: Not enough OSM tokens");
        require(config.osmToken.allowance(msg.sender, address(this)) >= amount, "HodlerVault: Not enough OSM tokens allowance");

        (uint reserve1, uint reserve2, ) = config.tokenPair.getReserves();

        uint ethRequired;

        if (address(config.osmToken) > address(config.weth)) {
            ethRequired = config.uniswapRouter.quote(
                amount,
                reserve2,
                reserve1
            );
        } else {
            ethRequired = config.uniswapRouter.quote(
                amount,
                reserve1,
                reserve2
            );
        }

        require(
            address(this).balance >= ethRequired,
            "HodlerVault: insufficient ETH on HodlerVault"
        );

        IWETH(config.weth).deposit{ value: ethRequired }();
        address tokenPairAddress = address(config.tokenPair);
        IWETH(config.weth).transfer(tokenPairAddress, ethRequired);
        config.osmToken.transferFrom(
            msg.sender,
            tokenPairAddress,
            amount
        );

        uint liquidityCreated = config.tokenPair.mint(address(this));

        lockedLP[msg.sender].push(
            LPbatch({
                amount: liquidityCreated,
                timestamp: block.timestamp,
                claimed: false
            })
        );

        emit LPQueued(
            msg.sender,
            liquidityCreated,
            ethRequired,
            amount,
            block.timestamp
        );

    }

    //pops latest LP if older than period
    function claimLP() public {
        uint next = queueCounter[msg.sender];
        require(
            next < lockedLP[msg.sender].length,
            "HodlerVault: nothing to claim."
        );
        LPbatch storage batch = lockedLP[msg.sender][next];
        require(
            block.timestamp - batch.timestamp > getStakeDuration(),
            "HodlerVault: LP still locked."
        );
        next++;
        queueCounter[msg.sender] = next;
        uint donation = (config.donationShare * batch.amount) / 100;
        batch.claimed = true;
        emit LPClaimed(msg.sender, batch.amount, block.timestamp, donation);
        require(
            config.tokenPair.transfer(address(0), donation),
            "HodlerVault: donation transfer failed in LP claim."
        );
        require(
            config.tokenPair.transfer(msg.sender, batch.amount - donation),
            "HodlerVault: transfer failed in LP claim."
        );
    }

    // Could not be canceled if activated
    function enableLPForceUnlock() public onlyOwner {
        forceUnlock = true;
    }
}

// File: /Users/elenaderymova/projects/work/4irelabs/options-market-vaults/contracts/facades/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.7.1;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {

    function decimals() external view returns (uint8);
    /**
     * @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: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

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

// File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol



pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol



pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol



pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: @uniswap/v2-periphery/contracts/interfaces/IWETH.sol



pragma solidity >=0.5.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}