using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Net.Sockets;//socket库
using System.Net.Http;
using System.Net;
using System.IO;
using System;
using System.Security.Policy;
using log4net;
using log4net.Config;
using System.Text.Json;
using chatclient.Data;
using System.ComponentModel;
using System.Collections.ObjectModel;
using System.Windows.Threading;
using System.Collections.Specialized;

[assembly: XmlConfigurator(ConfigFile = "config/log4net.config", Watch = true)]
namespace chatclient
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        LoginWindow Login = new();
        static string? receive;
        public static string UserName { get; set; } = "?";
        public static string? token = null;
        private static readonly ILog log = LogManager.GetLogger(typeof(MainWindow));
        public static Socket? Client;
        public static readonly HttpClient HttpClient = new HttpClient();
        public event PropertyChangedEventHandler? PropertyChanged;
    private string? _Username;
        public string? Username
        {
            get { return _Username; }
            set
            {
                _Username = value;
                Update("Username");
            }
        }
        // 消息列表
        public ObservableCollection<ChatMessage> Messages { get; } = new ObservableCollection<ChatMessage>();
        private ItemsControl MessageList => messageList;
        private ScrollViewer MessageScroller => messageScroller;
        private void Update(string UpdateName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(UpdateName));
        }
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;
            log.Info("Hello World!");
            this.Hide();
            Client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            try
            {
                log.Info($"连接服务器 {Server.ServerIP}:{Server.ServerPort} ");
                Client.Connect(Server.ServerIP, Server.ServerPort);
            }
            catch (Exception ex)
            {
                Client.Close();
                log.Error(ex);
            }
            Login.Show();
            if(Client != null && Client.Connected == true) StartReceive();
            MessageList.ItemsSource = Messages;
            ((INotifyCollectionChanged)MessageList.Items).CollectionChanged += (s, e) =>
            {
                // 确保有足够的时间让UI更新  
                Dispatcher.BeginInvoke(new Action(() =>
                {
                    MessageScroller.ScrollToEnd();
                }), DispatcherPriority.ContextIdle);
            };
        }
        public static void StartReceive()
        {
            if (Client != null && Client.Connected == true)
            {
                Thread th = new Thread(Receive);
                th.Start();
            }
            else { log.Fatal("在Client为NULL或未连接服务器时被调用StartReceive()"); }
        }
        static void Receive()
        {
            byte[] buffer = new byte[1024];
            try
            {
                while (true)
                {
                    int num = Client!.Receive(buffer);
                    if (num == 0) break;
                    if (Client.Poll(100, SelectMode.SelectRead) && Client.Available == 0 || !Client.Connected)
                    {
                        log.Error("连接已断开");
                        break;
                    }
                    receive = Encoding.UTF8.GetString(buffer, 0, num);
                    response(receive);
                }
            }
            catch (Exception ex)
            {
                log.Error(ex);
            }
            finally
            {
                Client?.Close();
            }
        }
        static void response(string msg)
        {
            log.Info($"收到服务器消息: {msg}");
            try
            {
                var Type = JsonSerializer.Deserialize<RegisterData>(msg);
                if (Type != null)
                {
                    var LoginResponse = JsonSerializer.Deserialize<LoginResultData>(msg);
                    if (Type.type == "login_1")
                    {
                        if (LoginResponse!.status == "success" && LoginResponse != null)
                        {
                            token = LoginResponse.token;
                            UserName = LoginResponse.username ?? "Unnamed";
                            Application.Current.Dispatcher.Invoke(() =>
                            {
                                var mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
                                if (mainWindow != null)
                                {
                                    mainWindow.Username = UserName;
                                    mainWindow.Show();
                                    var loginWindow = Application.Current.Windows.OfType<LoginWindow>().FirstOrDefault();
                                    loginWindow?.Close();
                                    mainWindow.Activate();
                                }
                            });
                            log.Info($"用户 {UserName} 登录成功(token:{token})");
                        }
                        else
                        {
                            Application.Current.Dispatcher.Invoke(() =>
                            {
                                var loginWindow = Application.Current.Windows.OfType<LoginWindow>().FirstOrDefault();
                                if (loginWindow != null)
                                {
                                    loginWindow.LoginMsg = LoginResponse != null ? LoginResponse.message : "服务器返回错误";
                                }
                            });
                        }
                    }
                    else if (Type.type == "login_0" && LoginResponse != null)
                    {
                        log.Warn($"登录失败: {LoginResponse.message}\nMsg:{msg}");
                        Application.Current.Dispatcher.Invoke(() =>
                        {
                            var loginWindow = Application.Current.Windows.OfType<LoginWindow>().FirstOrDefault();
                            if (loginWindow != null)
                            {
                                loginWindow.LoginMsg = "用户名或密码错误";
                            }
                        });
                    }
                    else if (Type.type == "chat")
                    {
                        var chat = JsonSerializer.Deserialize<ChatRegisterData>(msg);
                        if (chat != null)
                        {
                            Application.Current.Dispatcher.Invoke(() =>
                            {
                                // 处理聊天消息
                                if (chat.user == UserName)
                                {
                                    var chatmessage = new ChatMessage
                                    {
                                        Sender = chat.user ?? "未知用户",
                                        Type = MessageType.Text,
                                        Image = new BitmapImage(new Uri(chat.image ?? "pack://application:,,,/resource/user.png", UriKind.Absolute)),
                                        Content = chat.message ?? "(无内容)",
                                        Timestamp = DateTime.Now,
                                        Alignment = HorizontalAlignment.Right,
                                        SenderColor = new SolidColorBrush(Colors.Blue)
                                    };
                                    var mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
                                    mainWindow?.Messages.Add(chatmessage);
                                }
                                else
                                {
                                    var chatmessage = new ChatMessage
                                    {
                                        Sender = chat.user ?? "未知用户",
                                        Type = MessageType.Text,
                                        Image = new BitmapImage(new Uri(chat.image ?? "pack://application:,,,/resource/user.png", UriKind.Absolute)),
                                        Content = chat.message ?? "(无内容)",
                                        Timestamp = chat.timestamp,
                                        Alignment = HorizontalAlignment.Left,
                                        SenderColor = new SolidColorBrush(Colors.Black)
                                    };
                                    var mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
                                    mainWindow?.Messages.Add(chatmessage);
                                }
                                
                            });
                        }
                        else
                        {
                            log.Error("反序列化聊天数据时返回了 null");
                        }
                    }
                    else
                    {
                        log.Error($"未知的消息类型: {Type.type}，请检查服务器响应格式");
                        Application.Current.Dispatcher.Invoke(() =>
                        {
                            var loginWindow = Application.Current.Windows.OfType<LoginWindow>().FirstOrDefault();
                            if (loginWindow != null) loginWindow.LoginMsg = "服务器返回了错误的值";
                        });
                    }
                }
            }
            catch (JsonException ex)
            {
                log.Error("JSON解析错误", ex);
            }
            catch (Exception ex)
            {
                log.Error("处理响应时发生错误", ex);
            }
        }
        private async void SendMessage_Click(object sender, RoutedEventArgs e)
        {
            await SendMessage();
        }
        private async Task SendMessage()
        {
            if (string.IsNullOrWhiteSpace(txtMessage.Text))
                return;

            // 获取当前选中的联系人
            //var contact = cmbContacts.SelectedItem as Contact;
            // 判断是否为群组，若是则收件人设为“所有人”，否则为联系人显示名
            //string recipient = contact?.IsGroup == true ? "所有人" : contact?.DisplayName;

            // 弃用的方法
            // 创建新消息
            //var newMessage = new ChatMessage
            //{
            //    Sender = "我",
            //    Type = MessageType.Text,
            //    Image = new BitmapImage(new Uri("pack://application:,,,/resource/user.png", UriKind.Absolute)), // 默认头像
            //    Content = txtMessage.Text,
            //    Timestamp = DateTime.Now,
            //    Alignment = HorizontalAlignment.Right, // 自己发送的消息靠右
            //    SenderColor = new SolidColorBrush(Colors.Blue)
            //};
            var newChatMessage = new ChatData
            {
                type = "chat",
                message = txtMessage.Text
            };
            string ChatJsonData = JsonSerializer.Serialize(newChatMessage);
            byte[] dataBytes = Encoding.UTF8.GetBytes(ChatJsonData);
            log.Info($"向服务器聊天信息(长度：{dataBytes.Length})");
            // 检查Socket是否可用
            if (Client?.Connected == true)
            {
                Client.Send(dataBytes);
                Application.Current.Dispatcher.Invoke(() => 
                {
                    txtMessage.Clear();
                });
                return;
            }
            log.Info("未连接服务器，尝试异步连接");
            // 异步连接操作
            await Task.Run(() =>
            {
                try
                {
                    Client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                    Client?.Connect(IPAddress.Parse(Server.ServerIP), Server.ServerPort);
                    StartReceive();
                    Client?.Send(dataBytes);
                    Application.Current.Dispatcher.Invoke(() =>
                    {
                        txtMessage.Clear();
                    });
                }
                catch (Exception ex)
                {
                    log.Error($"连接失败: {ex.Message}");
                    Client?.Close();
                    Application.Current.Dispatcher.Invoke(() =>
                    {
                        var mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
                        if (mainWindow != null)
                        {
                            QueueMessage("连接失败，请检查网络设置或服务器状态。");
                        }
                    });
                }
            });
            // 添加到消息列表
            //Messages.Add(newMessage);
        }
        private void QueueMessage(string message)
        {
            if (SnackbarThree.MessageQueue is { } messageQueue)
            {
                //use the message queue to send a message.
                //the message queue can be called from any thread
                Task.Factory.StartNew(() => messageQueue.Enqueue(message));
            }
        }
    }
}