/*

  Copyright 2019 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/

pragma solidity ^0.5.9;
pragma experimental ABIEncoderV2;

import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
import "@0x/contracts-exchange-libs/contracts/src/LibFillResults.sol";


contract IExchangeCore {

    // Fill event is emitted whenever an order is filled.
    event Fill(
        address indexed makerAddress,         // Address that created the order.
        address indexed feeRecipientAddress,  // Address that received fees.
        bytes makerAssetData,                 // Encoded data specific to makerAsset.
        bytes takerAssetData,                 // Encoded data specific to takerAsset.
        bytes makerFeeAssetData,              // Encoded data specific to makerFeeAsset.
        bytes takerFeeAssetData,              // Encoded data specific to takerFeeAsset.
        bytes32 indexed orderHash,            // EIP712 hash of order (see LibOrder.getTypedDataHash).
        address takerAddress,                 // Address that filled the order.
        address senderAddress,                // Address that called the Exchange contract (msg.sender).
        uint256 makerAssetFilledAmount,       // Amount of makerAsset sold by maker and bought by taker.
        uint256 takerAssetFilledAmount,       // Amount of takerAsset sold by taker and bought by maker.
        uint256 makerFeePaid,                 // Amount of makerFeeAssetData paid to feeRecipient by maker.
        uint256 takerFeePaid,                 // Amount of takerFeeAssetData paid to feeRecipient by taker.
        uint256 protocolFeePaid               // Amount of eth or weth paid to the staking contract.
    );

    // Cancel event is emitted whenever an individual order is cancelled.
    event Cancel(
        address indexed makerAddress,         // Address that created the order.
        address indexed feeRecipientAddress,  // Address that would have recieved fees if order was filled.
        bytes makerAssetData,                 // Encoded data specific to makerAsset.
        bytes takerAssetData,                 // Encoded data specific to takerAsset.
        address senderAddress,                // Address that called the Exchange contract (msg.sender).
        bytes32 indexed orderHash             // EIP712 hash of order (see LibOrder.getTypedDataHash).
    );

    // CancelUpTo event is emitted whenever `cancelOrdersUpTo` is executed succesfully.
    event CancelUpTo(
        address indexed makerAddress,         // Orders cancelled must have been created by this address.
        address indexed orderSenderAddress,   // Orders cancelled must have a `senderAddress` equal to this address.
        uint256 orderEpoch                    // Orders with specified makerAddress and senderAddress with a salt less than this value are considered cancelled.
    );

    /// @dev Cancels all orders created by makerAddress with a salt less than or equal to the targetOrderEpoch
    ///      and senderAddress equal to msg.sender (or null address if msg.sender == makerAddress).
    /// @param targetOrderEpoch Orders created with a salt less or equal to this value will be cancelled.
    function cancelOrdersUpTo(uint256 targetOrderEpoch)
        external
        payable;

    /// @dev Fills the input order.
    /// @param order Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    /// @return Amounts filled and fees paid by maker and taker.
    function fillOrder(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        public
        payable
        returns (LibFillResults.FillResults memory fillResults);

    /// @dev After calling, the order can not be filled anymore.
    /// @param order Order struct containing order specifications.
    function cancelOrder(LibOrder.Order memory order)
        public
        payable;

    /// @dev Gets information about an order: status, hash, and amount filled.
    /// @param order Order to gather information on.
    /// @return OrderInfo Information about the order and its state.
    ///                   See LibOrder.OrderInfo for a complete description.
    function getOrderInfo(LibOrder.Order memory order)
        public
        view
        returns (LibOrder.OrderInfo memory orderInfo);
}