//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2019 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//

class CounterHandler: ChannelDuplexHandler {
    typealias InboundIn = Any
    typealias InboundOut = Any
    typealias OutboundIn = Any
    typealias OutboundOut = Any

    var channelRegisteredCalls = 0
    var channelUnregisteredCalls = 0
    var channelActiveCalls = 0
    var channelInactiveCalls = 0
    var channelReadCalls = 0
    var channelReadCompleteCalls = 0
    var channelWritabilityChangedCalls = 0
    var userInboundEventTriggeredCalls = 0
    var errorCaughtCalls = 0
    var registerCalls = 0
    var bindCalls = 0
    var connectCalls = 0
    var writeCalls = 0
    var flushCalls = 0
    var readCalls = 0
    var closeCalls = 0
    var triggerUserOutboundEventCalls = 0

    func channelRegistered(context: ChannelHandlerContext) {
        self.channelRegisteredCalls += 1
        XCTAssertEqual(1, self.channelRegisteredCalls, "\(#function) should only ever be called once")
        context.fireChannelRegistered()
    }
    func channelUnregistered(context: ChannelHandlerContext) {
        self.channelUnregisteredCalls += 1
        XCTAssertEqual(1, self.channelUnregisteredCalls, "\(#function) should only ever be called once")
        context.fireChannelUnregistered()
    }
    func channelActive(context: ChannelHandlerContext) {
        self.channelActiveCalls += 1
        XCTAssertEqual(1, self.channelActiveCalls, "\(#function) should only ever be called once")
        context.fireChannelActive()
    }
    func channelInactive(context: ChannelHandlerContext) {
        self.channelInactiveCalls += 1
        XCTAssertEqual(1, self.channelInactiveCalls, "\(#function) should only ever be called once")
        context.fireChannelInactive()
    }
    func channelRead(context: ChannelHandlerContext, data: NIOAny) {
        self.channelReadCalls += 1
        context.fireChannelRead(data)
    }
    func channelReadComplete(context: ChannelHandlerContext) {
        self.channelReadCompleteCalls += 1
        context.fireChannelReadComplete()
    }
    func channelWritabilityChanged(context: ChannelHandlerContext) {
        self.channelWritabilityChangedCalls += 1
        context.fireChannelWritabilityChanged()
    }
    func userInboundEventTriggered(context: ChannelHandlerContext, event: Any) {
        self.userInboundEventTriggeredCalls += 1
        context.fireUserInboundEventTriggered(event)
    }
    func errorCaught(context: ChannelHandlerContext, error: Error) {
        self.errorCaughtCalls += 1
        context.fireErrorCaught(error)
    }
    func register(context: ChannelHandlerContext, promise: EventLoopPromise<Void>?) {
        self.registerCalls += 1
        XCTAssertEqual(1, self.registerCalls, "\(#function) should only ever be called once")
        context.register(promise: promise)
    }
    func bind(context: ChannelHandlerContext, to: SocketAddress, promise: EventLoopPromise<Void>?) {
        self.bindCalls += 1
        XCTAssertEqual(1, self.bindCalls, "\(#function) should only ever be called once")
        context.bind(to: to, promise: promise)
    }
    func connect(context: ChannelHandlerContext, to: SocketAddress, promise: EventLoopPromise<Void>?) {
        self.connectCalls += 1
        XCTAssertEqual(1, self.connectCalls, "\(#function) should only ever be called once")
        context.connect(to: to, promise: promise)
    }
    func write(context: ChannelHandlerContext, data: NIOAny, promise: EventLoopPromise<Void>?) {
        self.writeCalls += 1
        context.write(data, promise: promise)
    }
    func flush(context: ChannelHandlerContext) {
        self.flushCalls += 1
        context.flush()
    }
    func read(context: ChannelHandlerContext) {
        self.readCalls += 1
        context.read()
    }
    func close(context: ChannelHandlerContext, mode: CloseMode, promise: EventLoopPromise<Void>?) {
        self.closeCalls += 1
        XCTAssertEqual(1, self.closeCalls, "\(#function) should only ever be called once")
        context.close(mode: mode, promise: promise)
    }
    func triggerUserOutboundEvent(context: ChannelHandlerContext, event: Any, promise: EventLoopPromise<Void>?) {
        self.triggerUserOutboundEventCalls += 1
        context.triggerUserOutboundEvent(event, promise: promise)
    }
}