// File: contracts/LpTokenVesting.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/*
This contract receives XRUNE from the Thorstarter grants multisig and some
project tokens, then, when ready, an owner calls the `lock` method and both
tokens are paired in an AMM and the LP tokens are locked in this contract.
Over time, each party can claim their vested tokens. Each party is owed an
equal share of the initial amount of LP tokens. If a pool already exist, we
attempt to swap some amount of tokens to bring the price in line with the target
price.
*/

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./interfaces/IUniswapV2Router.sol";
import "./interfaces/IUniswapV2Factory.sol";

contract LpTokenVesting {
    using SafeERC20 for IERC20;

    struct Party {
        uint claimedAmount;
        mapping(address => bool) owners;
    }

    IERC20 public token0;
    IERC20 public token1;
    IUniswapV2Router public sushiRouter;
    uint public vestingCliff;
    uint public vestingLength;

    uint public partyCount;
    mapping(uint => Party) public parties;
    mapping(address => bool) public owners;
    uint public initialLpShareAmount;
    uint public vestingStart;

    event Claimed(uint party, uint amount);
    event Locked(uint time, uint amount, uint balance0, uint balance1);

    constructor(address _token0, address _token1, address _sushiRouter, uint _vestingCliff, uint _vestingLength, address[] memory _owners) {
        (_token0, _token1) = _token0 < _token1 ? (_token0, _token1) : (_token1, _token0);
        token0 = IERC20(_token0);
        token1 = IERC20(_token1);
        sushiRouter = IUniswapV2Router(_sushiRouter);
        vestingCliff = _vestingCliff;
        vestingLength = _vestingLength;
        partyCount = _owners.length;
        require(vestingLength > 2592000, "vesting needs to last at least 1 month");
        for (uint i = 0; i < _owners.length; i++) {
            Party storage p = parties[i];
            p.owners[_owners[i]] = true;
            owners[_owners[i]] = true;
        }
    }

    modifier onlyOwner {
        require(owners[msg.sender], "not an owner");
        _;
    }

    function toggleOwner(uint party, address owner) public {
        Party storage p = parties[party];
        require(p.owners[msg.sender], "not an owner of this party");
        require(owner != msg.sender, "can't toggle access for yourself");
        p.owners[owner] = !p.owners[owner];
        owners[owner] = p.owners[owner];
    }

    function partyClaimedAmount(uint party) public view returns (uint) {
        return parties[party].claimedAmount;
    }

    function partyOwner(uint party, address owner) public view returns (bool) {
        return parties[party].owners[owner];
    }

    function pair() public view returns (address) {
        return IUniswapV2Factory(sushiRouter.factory()).getPair(address(token0), address(token1));
    }
    
    function claimable(uint party) public view returns (uint) {
        if (vestingStart == 0 || party >= partyCount) {
            return 0;
        }
        Party storage p = parties[party];
        uint percentVested = (block.timestamp - _min(block.timestamp, vestingStart + vestingCliff)) * 1e6 / vestingLength;
        if (percentVested > 1e6) {
            percentVested = 1e6;
        }
        return ((initialLpShareAmount * percentVested) / 1e6 / partyCount) - p.claimedAmount;
    }
    
    function claim(uint party) public returns (uint) {
        Party storage p = parties[party];
        require(p.owners[msg.sender], "not an owner of this party");
        uint amount = claimable(party);
        if (amount > 0) {
            p.claimedAmount += amount;
            IERC20(pair()).safeTransfer(msg.sender, amount);
            emit Claimed(party, amount);
        }
        return amount;
    }

    function lock() public onlyOwner {
        require(vestingStart == 0, "vesting already started");

        uint token0Balance = token0.balanceOf(address(this));
        uint token1Balance = token1.balanceOf(address(this));
        address pairAddress = pair();

        // If there's already a pair, we'll need to do a swap in order get the price in the right place
        if (pairAddress != address(0)) {
            IUniswapV2Pair pool = IUniswapV2Pair(pairAddress);
            uint targetPrice = (token0Balance * 1e6) / token1Balance;
            (uint112 reserve0, uint112 reserve1,) = pool.getReserves();
            uint currentPrice = (reserve0 * 1e6) / reserve1;
            uint difference = (currentPrice * 1e6) / targetPrice;
            if (difference < 995000) {
                // Current price is smaller than target (>0.5%), swap token1 for token0
                // We divide the amount of reserve1 to send that would balance the price
                // in two because an ammout of reserve0 is going to come out
                address[] memory path = new address[](2);
                path[0] = address(token0);
                path[1] = address(token1);
                // Multiply amount by 0.6 because swapping 100% of the difference would remove the
                // the equivalent amount from the opposite reserves (we're aiming for half that impact)
                uint amount = (reserve0 * (1e6 - difference) * 60) / 1e6 / 100;
                token0.safeApprove(address(sushiRouter), amount);
                sushiRouter.swapExactTokensForTokens(amount, 0, path, address(this), type(uint).max);
            }
            if (difference > 10050000) {
                // Current price is greater than target (>0.5%), swap token0 for token1
                address[] memory path = new address[](2);
                path[0] = address(token1);
                path[1] = address(token0);
                uint amount = (reserve1 * (difference - 1e6)) / 1e6 / 2;
                token1.safeApprove(address(sushiRouter), amount);
                sushiRouter.swapExactTokensForTokens(amount, 0, path, address(this), type(uint).max);
            }

            (reserve0, reserve1,) = pool.getReserves();
        }

        // Update balances in case we did a swap to adjust price
        token0Balance = token0.balanceOf(address(this));
        token1Balance = token1.balanceOf(address(this));
        token0.safeApprove(address(sushiRouter), token0Balance);
        token1.safeApprove(address(sushiRouter), token1Balance);
        sushiRouter.addLiquidity(
            address(token0), address(token1),
            token0Balance, token1Balance,
            (token0Balance * 9850) / 10000, (token1Balance * 9850) / 10000,
            address(this), type(uint).max
        );

        pairAddress = pair();
        initialLpShareAmount = IERC20(pairAddress).balanceOf(address(this));
        vestingStart = block.timestamp;
        emit Locked(vestingStart, initialLpShareAmount, token0Balance, token1Balance);
    }

    function withdraw(address token, uint amount) public onlyOwner {
        require(token == address(token0) || token == address(token1), "can only withdraw token{0,1}");
        IERC20(token).safeTransfer(msg.sender, amount);
    }

    function _min(uint a, uint b) private pure returns (uint) {
        return a < b ? a : b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts/interfaces/IUniswapV2Pair.sol



// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

interface IUniswapV2Pair {
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
}

// File: contracts/interfaces/IUniswapV2Router.sol



// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

interface IUniswapV2Router {
    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 removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
}

// File: contracts/interfaces/IUniswapV2Factory.sol



// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

interface IUniswapV2Factory {
    function getPair(address tokenA, address tokenB) external view returns (address pair);
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}