using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using CryptoExchange.Net.Logging;
using CryptoExchange.Net.Objects;
using CryptoExchange.Net.Sockets;
using CryptoExchange.Net.UnitTests.TestImplementations;
using Newtonsoft.Json.Linq;
using NUnit.Framework;

namespace CryptoExchange.Net.UnitTests
{
    [TestFixture]
    public class SocketClientTests
    {
        [TestCase]
        public void SettingOptions_Should_ResultInOptionsSet()
        {
            // arrange
            // act
            var client = new TestSocketClient(new SocketClientOptions()
            {
                BaseAddress = "http://test.address.com",
                ReconnectInterval = TimeSpan.FromSeconds(6)
            });


            // assert
            Assert.IsTrue(client.BaseAddress == "http://test.address.com");
            Assert.IsTrue(client.ReconnectInterval.TotalSeconds == 6);
        }

        [TestCase(true)]
        [TestCase(false)]
        public void ConnectSocket_Should_ReturnConnectionResult(bool canConnect)
        {
            // arrange
            var client = new TestSocketClient();
            var socket = client.CreateSocket();
            socket.CanConnect = canConnect;

            // act
            var connectResult = client.ConnectSocketSub(new SocketSubscription(socket));

            // assert
            Assert.IsTrue(connectResult.Success == canConnect);
        }

        [TestCase]
        public void SocketMessages_Should_BeProcessedInDataHandlers()
        {
            // arrange
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.Zero, LogVerbosity = LogVerbosity.Debug });
            var socket = client.CreateSocket();
            socket.ShouldReconnect = true;
            socket.CanConnect = true;
            socket.DisconnectTime = DateTime.UtcNow;
            var sub = new SocketSubscription(socket);
            var rstEvent = new ManualResetEvent(false);
            JToken result = null;
            sub.MessageHandlers.Add("TestHandler", (subs, data) =>
            {
                result = data;
                rstEvent.Set();
                return true;

            });
            client.ConnectSocketSub(sub);

            // act
            socket.InvokeMessage("{\"property\": 123}");
            rstEvent.WaitOne(1000);

            // assert
            Assert.IsTrue((int)result["property"] == 123);
        }

        [TestCase]
        public void SocketMessages_Should_NotBeProcessedInSubsequentHandlersIfHandlerReturnsTrue()
        {
            // arrange
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.Zero, LogVerbosity = LogVerbosity.Debug });
            var socket = client.CreateSocket();
            socket.ShouldReconnect = true;
            socket.CanConnect = true;
            socket.DisconnectTime = DateTime.UtcNow;
            var sub = new SocketSubscription(socket);
            var rstEvent1 = new ManualResetEvent(false);
            var rstEvent2 = new ManualResetEvent(false);
            JToken result1 = null;
            JToken result2 = null;
            sub.MessageHandlers.Add("TestHandler", (subs, data) =>
            {
                result1 = data;
                rstEvent1.Set();
                return true;
            });
            sub.MessageHandlers.Add("TestHandlerNotHit", (subs, data) =>
            {
                result2 = data;
                rstEvent2.Set();
                return true;
            });
            client.ConnectSocketSub(sub);

            // act
            socket.InvokeMessage("{\"property\": 123}");
            rstEvent1.WaitOne(100);
            rstEvent2.WaitOne(100);

            // assert
            Assert.IsTrue((int)result1["property"] == 123);
            Assert.IsTrue(result2 == null);
        }

        [TestCase]
        public void SocketMessages_Should_BeProcessedInSubsequentHandlersIfHandlerReturnsFalse()
        {
            // arrange
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.Zero, LogVerbosity = LogVerbosity.Debug });
            var socket = client.CreateSocket();
            socket.ShouldReconnect = true;
            socket.CanConnect = true;
            socket.DisconnectTime = DateTime.UtcNow;
            var sub = new SocketSubscription(socket);
            var rstEvent = new ManualResetEvent(false);
            JToken result = null;
            sub.MessageHandlers.Add("TestHandlerNotProcessing", (subs, data) =>
            {
                return false;
            });
            sub.MessageHandlers.Add("TestHandler", (subs, data) =>
            {
                result = data;
                rstEvent.Set();
                return true;
            });
            client.ConnectSocketSub(sub);

            // act
            socket.InvokeMessage("{\"property\": 123}");
            rstEvent.WaitOne(100);

            // assert
            Assert.IsTrue((int)result["property"] == 123);
        }


        [TestCase]
        public void DisconnectedSocket_Should_Reconnect()
        {
            // arrange
            bool reconnected = false;
            var client = new TestSocketClient(new SocketClientOptions(){ReconnectInterval = TimeSpan.Zero ,LogVerbosity = LogVerbosity.Debug});
            var socket = client.CreateSocket();
            socket.ShouldReconnect = true;
            socket.CanConnect = true;
            socket.DisconnectTime = DateTime.UtcNow;
            var sub = new SocketSubscription(socket);
            client.ConnectSocketSub(sub);
            var rstEvent = new ManualResetEvent(false);
            client.OnReconnect += () =>
            {
                reconnected = true;
                rstEvent.Set();
                return true;
            };

            // act
            socket.InvokeClose();
            rstEvent.WaitOne(1000);

            // assert
            Assert.IsTrue(reconnected);
        }

        [TestCase()]
        public void UnsubscribingStream_Should_CloseTheSocket()
        {
            // arrange
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.Zero, LogVerbosity = LogVerbosity.Debug });
            var socket = client.CreateSocket();
            socket.CanConnect = true;
            var sub = new SocketSubscription(socket);
            client.ConnectSocketSub(sub);
            var ups = new UpdateSubscription(sub);

            // act
            client.Unsubscribe(ups).Wait();

            // assert
            Assert.IsTrue(socket.Connected == false);
        }

        [TestCase()]
        public void UnsubscribingAll_Should_CloseAllSockets()
        {
            // arrange
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.Zero, LogVerbosity = LogVerbosity.Debug });
            var socket1 = client.CreateSocket();
            var socket2 = client.CreateSocket();
            socket1.CanConnect = true;
            socket2.CanConnect = true;
            var sub1 = new SocketSubscription(socket1);
            var sub2 = new SocketSubscription(socket2);
            client.ConnectSocketSub(sub1);
            client.ConnectSocketSub(sub2);

            // act
            client.UnsubscribeAll().Wait();

            // assert
            Assert.IsTrue(socket1.Connected == false);
            Assert.IsTrue(socket2.Connected == false);
        }

        [TestCase()]
        public void FailingToConnectSocket_Should_ReturnError()
        {
            // arrange
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.Zero, LogVerbosity = LogVerbosity.Debug });
            var socket = client.CreateSocket();
            socket.CanConnect = false;
            var sub = new SocketSubscription(socket);

            // act
            var connectResult = client.ConnectSocketSub(sub);

            // assert
            Assert.IsFalse(connectResult.Success);
        }
        
        [Test]
        public void WhenResubscribeFails_Socket_ShouldReconnect()
        {
            // arrange
            int reconnected = 0;
            var client = new TestSocketClient(new SocketClientOptions() { ReconnectInterval = TimeSpan.FromMilliseconds(1), LogVerbosity = LogVerbosity.Debug });
            var socket = client.CreateSocket();
            socket.ShouldReconnect = true;
            socket.CanConnect = true;
            socket.DisconnectTime = DateTime.UtcNow;
            var sub = new SocketSubscription(socket);
            client.ConnectSocketSub(sub);
            var rstEvent = new ManualResetEvent(false);
            client.OnReconnect += () =>
            {
                reconnected++;
                rstEvent.Set();
                return reconnected == 2;
            };

            // act
            socket.InvokeClose();
            rstEvent.WaitOne(1000);
            Thread.Sleep(100);

            // assert
            Assert.IsTrue(reconnected == 2);
        }
    }
}