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// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "../libraries/math/SafeMath.sol";

import "../core/interfaces/IOrderBook.sol";

contract OrderBookReader {
    using SafeMath for uint256;

    struct Vars {
        uint256 i;
        uint256 index;
        address account;
        uint256 uintLength;
        uint256 addressLength;
    }

    function getIncreaseOrders(
        address payable _orderBookAddress, 
        address _account,
        uint256[] memory _indices
    ) external view returns (uint256[] memory, address[] memory) {
        Vars memory vars = Vars(0, 0, _account, 5, 3);

        uint256[] memory uintProps = new uint256[](vars.uintLength * _indices.length);
        address[] memory addressProps = new address[](vars.addressLength * _indices.length);

        IOrderBook orderBook = IOrderBook(_orderBookAddress);

        while (vars.i < _indices.length) {
            vars.index = _indices[vars.i];
            (
                address purchaseToken,
                uint256 purchaseTokenAmount,
                address collateralToken,
                address indexToken,
                uint256 sizeDelta,
                bool isLong,
                uint256 triggerPrice,
                bool triggerAboveThreshold,
                // uint256 executionFee
            ) = orderBook.getIncreaseOrder(vars.account, vars.index);

            uintProps[vars.i * vars.uintLength] = uint256(purchaseTokenAmount);
            uintProps[vars.i * vars.uintLength + 1] = uint256(sizeDelta);
            uintProps[vars.i * vars.uintLength + 2] = uint256(isLong ? 1 : 0);
            uintProps[vars.i * vars.uintLength + 3] = uint256(triggerPrice);
            uintProps[vars.i * vars.uintLength + 4] = uint256(triggerAboveThreshold ? 1 : 0);

            addressProps[vars.i * vars.addressLength] = (purchaseToken);
            addressProps[vars.i * vars.addressLength + 1] = (collateralToken);
            addressProps[vars.i * vars.addressLength + 2] = (indexToken);

            vars.i++;
        }

        return (uintProps, addressProps);
    }

    function getDecreaseOrders(
        address payable _orderBookAddress, 
        address _account,
        uint256[] memory _indices
    ) external view returns (uint256[] memory, address[] memory) {
        Vars memory vars = Vars(0, 0, _account, 5, 2);

        uint256[] memory uintProps = new uint256[](vars.uintLength * _indices.length);
        address[] memory addressProps = new address[](vars.addressLength * _indices.length);

        IOrderBook orderBook = IOrderBook(_orderBookAddress);

        while (vars.i < _indices.length) {
            vars.index = _indices[vars.i];
            (
                address collateralToken,
                uint256 collateralDelta,
                address indexToken,
                uint256 sizeDelta,
                bool isLong,
                uint256 triggerPrice,
                bool triggerAboveThreshold,
                // uint256 executionFee
            ) = orderBook.getDecreaseOrder(vars.account, vars.index);

            uintProps[vars.i * vars.uintLength] = uint256(collateralDelta);
            uintProps[vars.i * vars.uintLength + 1] = uint256(sizeDelta);
            uintProps[vars.i * vars.uintLength + 2] = uint256(isLong ? 1 : 0);
            uintProps[vars.i * vars.uintLength + 3] = uint256(triggerPrice);
            uintProps[vars.i * vars.uintLength + 4] = uint256(triggerAboveThreshold ? 1 : 0);

            addressProps[vars.i * vars.addressLength] = (collateralToken);
            addressProps[vars.i * vars.addressLength + 1] = (indexToken);

            vars.i++;
        }

        return (uintProps, addressProps);
    }

    function getSwapOrders(
        address payable _orderBookAddress, 
        address _account,
        uint256[] memory _indices
    ) external view returns (uint256[] memory, address[] memory) {
        Vars memory vars = Vars(0, 0, _account, 5, 3);

        uint256[] memory uintProps = new uint256[](vars.uintLength * _indices.length);
        address[] memory addressProps = new address[](vars.addressLength * _indices.length);

        IOrderBook orderBook = IOrderBook(_orderBookAddress);

        while (vars.i < _indices.length) {
            vars.index = _indices[vars.i];
            (
                address path0,
                address path1,
                address path2,
                uint256 amountIn, 
                uint256 minOut, 
                uint256 triggerRatio, 
                bool triggerAboveThreshold,
                bool shouldUnwrap,
                // uint256 executionFee
            ) = orderBook.getSwapOrder(vars.account, vars.index);

            uintProps[vars.i * vars.uintLength] = uint256(amountIn);
            uintProps[vars.i * vars.uintLength + 1] = uint256(minOut);
            uintProps[vars.i * vars.uintLength + 2] = uint256(triggerRatio);
            uintProps[vars.i * vars.uintLength + 3] = uint256(triggerAboveThreshold ? 1 : 0);
            uintProps[vars.i * vars.uintLength + 4] = uint256(shouldUnwrap ? 1 : 0);

            addressProps[vars.i * vars.addressLength] = (path0);
            addressProps[vars.i * vars.addressLength + 1] = (path1);
            addressProps[vars.i * vars.addressLength + 2] = (path2);

            vars.i++;
        }

        return (uintProps, addressProps);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IOrderBook {
	function getSwapOrder(address _account, uint256 _orderIndex) external view returns (
        address path0, 
        address path1,
        address path2,
        uint256 amountIn,
        uint256 minOut,
        uint256 triggerRatio,
        bool triggerAboveThreshold,
        bool shouldUnwrap,
        uint256 executionFee
    );

    function getIncreaseOrder(address _account, uint256 _orderIndex) external view returns (
        address purchaseToken, 
        uint256 purchaseTokenAmount,
        address collateralToken,
        address indexToken,
        uint256 sizeDelta,
        bool isLong,
        uint256 triggerPrice,
        bool triggerAboveThreshold,
        uint256 executionFee
    );

    function getDecreaseOrder(address _account, uint256 _orderIndex) external view returns (
        address collateralToken,
        uint256 collateralDelta,
        address indexToken,
        uint256 sizeDelta,
        bool isLong,
        uint256 triggerPrice,
        bool triggerAboveThreshold,
        uint256 executionFee
    );

    function executeSwapOrder(address, uint256, address payable) external;
    function executeDecreaseOrder(address, uint256, address payable) external;
    function executeIncreaseOrder(address, uint256, address payable) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

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

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

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

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[{"inputs":[{"internalType":"address payable","name":"_orderBookAddress","type":"address"},{"internalType":"address","name":"_account","type":"address"},{"internalType":"uint256[]","name":"_indices","type":"uint256[]"}],"name":"getDecreaseOrders","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address payable","name":"_orderBookAddress","type":"address"},{"internalType":"address","name":"_account","type":"address"},{"internalType":"uint256[]","name":"_indices","type":"uint256[]"}],"name":"getIncreaseOrders","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address payable","name":"_orderBookAddress","type":"address"},{"internalType":"address","name":"_account","type":"address"},{"internalType":"uint256[]","name":"_indices","type":"uint256[]"}],"name":"getSwapOrders","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"}]

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