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// SPDX-License-Identifier: MIT
pragma solidity >0.7.5;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

// Paraswap's Camelot router
contract CamelotExchangeRouter {
  using SafeMath for uint256;

  /*solhint-disable var-name-mixedcase*/
  address private constant ETH_IDENTIFIER = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
  // Pool bits are 255-161: fee, 160: direction flag, 159-0: address
  uint256 private constant FEE_OFFSET = 161;
  uint256 private constant DIRECTION_FLAG = 0x0000000000000000000000010000000000000000000000000000000000000000;

  /*solhint-enable var-name-mixedcase */

  /*solhint-disable no-empty-blocks */
  receive() external payable {}

  /*solhint-enable no-empty-blocks */

  function swap(
    address tokenIn,
    uint256 amountIn,
    uint256 amountOutMin,
    address weth,
    uint256[] calldata pools
  ) external payable returns (uint256 tokensBought) {
    return _swap(tokenIn, amountIn, amountOutMin, weth, pools);
  }

  function _swap(
    address tokenIn,
    uint256 amountIn,
    uint256 amountOutMin,
    address weth,
    uint256[] memory pools
  ) private returns (uint256 tokensBought) {
    uint256 pairs = pools.length;

    require(pairs != 0, "At least one pool required");

    bool tokensBoughtEth;

    if (tokenIn == ETH_IDENTIFIER) {
      require(amountIn == msg.value, "Incorrect amount of ETH sent");
      IWETH(weth).deposit{ value: msg.value }();
      require(IWETH(weth).transfer(address(pools[0]), msg.value));
    } else {
      TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(pools[0]), amountIn);
      tokensBoughtEth = weth != address(0);
    }

    tokensBought = amountIn;

    for (uint256 i = 0; i < pairs; ++i) {
      uint256 p = pools[i];
      address pool = address(uint160(p));
      bool direction = p & DIRECTION_FLAG == 0;

      address tokenA = direction ? ICamelotPair(pool).token0() : ICamelotPair(pool).token1();
      tokensBought = ICamelotPair(pool).getAmountOut(tokensBought, tokenA);

      (uint256 amount0Out, uint256 amount1Out) = direction
      ? (uint256(0), tokensBought)
      : (tokensBought, uint256(0));
      ICamelotPair(pool).swap(
        amount0Out,
        amount1Out,
        i + 1 == pairs ? (tokensBoughtEth ? address(this) : msg.sender) : address(pools[i + 1]),
        ""
      );
    }

    if (tokensBoughtEth) {
      IWETH(weth).withdraw(tokensBought);
      TransferHelper.safeTransferETH(msg.sender, tokensBought);
    }

    require(tokensBought >= amountOutMin, "UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
  }
}


abstract contract IWETH is IERC20 {
  function deposit() external payable virtual;

  function withdraw(uint256 amount) external virtual;
}

interface ICamelotPair {
  function getAmountOut(uint256, address) external view returns (uint256);

  function token0() external returns (address);

  function token1() external returns (address);

  function swap(
    uint256 amount0Out,
    uint256 amount1Out,
    address to,
    bytes calldata data
  ) external;

  function stableSwap() external returns (bool);
}

library TransferHelper {
  /// @notice Transfers tokens from the targeted address to the given destination
  /// @notice Errors with 'STF' if transfer fails
  /// @param token The contract address of the token to be transferred
  /// @param from The originating address from which the tokens will be transferred
  /// @param to The destination address of the transfer
  /// @param value The amount to be transferred
  function safeTransferFrom(
    address token,
    address from,
    address to,
    uint256 value
  ) internal {
    (bool success, bytes memory data) =
    token.call(abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, value));
    require(success && (data.length == 0 || abi.decode(data, (bool))), 'STF');
  }

  /// @notice Transfers tokens from msg.sender to a recipient
  /// @dev Errors with ST if transfer fails
  /// @param token The contract address of the token which will be transferred
  /// @param to The recipient of the transfer
  /// @param value The value of the transfer
  function safeTransfer(
    address token,
    address to,
    uint256 value
  ) internal {
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
    require(success && (data.length == 0 || abi.decode(data, (bool))), 'ST');
  }

  /// @notice Approves the stipulated contract to spend the given allowance in the given token
  /// @dev Errors with 'SA' if transfer fails
  /// @param token The contract address of the token to be approved
  /// @param to The target of the approval
  /// @param value The amount of the given token the target will be allowed to spend
  function safeApprove(
    address token,
    address to,
    uint256 value
  ) internal {
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.approve.selector, to, value));
    require(success && (data.length == 0 || abi.decode(data, (bool))), 'SA');
  }

  /// @notice Transfers ETH to the recipient address
  /// @dev Fails with `STE`
  /// @param to The destination of the transfer
  /// @param value The value to be transferred
  function safeTransferETH(address to, uint256 value) internal {
    (bool success, ) = to.call{value: value}(new bytes(0));
    require(success, 'STE');
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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;
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address","name":"weth","type":"address"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"swap","outputs":[{"internalType":"uint256","name":"tokensBought","type":"uint256"}],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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