using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using WindowsGotify.Models;
using WindowsGotify.Services;
using WindowsGotify.Tray;

// 双开 WPF + WinForms 时,这几个类型两个命名空间都有,固定走 WPF 的。
using MessageBox = System.Windows.MessageBox;
using Color = System.Windows.Media.Color;
using Brush = System.Windows.Media.Brush;
using Brushes = System.Windows.Media.Brushes;
using Clipboard = System.Windows.Clipboard;
using Button = System.Windows.Controls.Button;

namespace WindowsGotify;

public partial class MainWindow : Window
{
    private const int MaxHistoryInUi = 200;

    private AppConfig? _config;
    private ConfigService? _configService;
    private Logger? _logger;
    private TrayIconService? _tray;
    private GotifyWebSocketService? _webSocket;
    private GotifyApiService? _apiService;
    private ApplicationCache? _appCache;

    private readonly ObservableCollection<GotifyMessage> _history = new();

    public MainWindow()
    {
        InitializeComponent();
        HistoryList.ItemsSource = _history;

        Closing += (_, e) =>
        {
            e.Cancel = true;
            Hide();
        };
    }

    public void Initialize(
        AppConfig config,
        ConfigService configService,
        Logger logger,
        TrayIconService tray,
        GotifyWebSocketService webSocket,
        GotifyApiService apiService,
        ApplicationCache appCache)
    {
        _config = config;
        _configService = configService;
        _logger = logger;
        _tray = tray;
        _webSocket = webSocket;
        _apiService = apiService;
        _appCache = appCache;

        UrlTextBox.Text = config.Gotify.Url;
        TokenBox.Password = config.Gotify.ClientToken;
        UpdateAppCount();
        SetStatus("等待连接", StatusKind.Pending);
        UpdateHistoryCount();
        UpdateThemeButtonLabel();

        // 实时消息追加到历史
        _webSocket.MessageReceived += OnLiveMessage;

        // 应用缓存更新时,刷新已加载消息的 AppName
        if (_appCache != null)
        {
            _appCache.Updated += (_, _) => Dispatcher.Invoke(() =>
            {
                UpdateAppCount();
                // 已存在的消息重新解析 AppName(缓存里可能新增了之前缺失的应用)
                foreach (var m in _history) m.AppName = _appCache.GetName(m.AppId);
                // 详情面板如果当前选中的,刷新
                if (HistoryList.SelectedItem is GotifyMessage sel) RenderDetail(sel);
            });
        }
    }

    public void ShowFromTray()
    {
        Show();
        WindowState = WindowState.Normal;
        Activate();
        // 每次打开都拉一次最新历史和应用,确保和远端同步
        _ = LoadHistoryAsync();
        _ = RefreshAppsAsync(silent: true);
    }

    private void OnLiveMessage(GotifyMessage msg)
    {
        Enrich(msg);
        Dispatcher.Invoke(() =>
        {
            _history.Insert(0, msg);
            TrimHistory();
            UpdateHistoryCount();
        });
    }

    /// <summary>
    /// 拿到一条消息后,补 AppName(从缓存查),返回原对象。
    /// </summary>
    private GotifyMessage Enrich(GotifyMessage msg)
    {
        if (_appCache != null && string.IsNullOrEmpty(msg.AppName))
        {
            msg.AppName = _appCache.GetName(msg.AppId);
        }
        return msg;
    }

    private void TrimHistory()
    {
        while (_history.Count > MaxHistoryInUi)
        {
            _history.RemoveAt(_history.Count - 1);
        }
    }

    private void UpdateHistoryCount()
    {
        HistoryCountText.Text = $"共 {_history.Count} 条";
    }

    private void UpdateAppCount()
    {
        if (_appCache == null) { AppCountText.Text = "  ·  应用:?"; return; }
        var n = _appCache.Count;
        AppCountText.Text = n == 0 ? "  ·  应用:0(未拉取)" : $"  ·  应用:{n}";
    }

    private enum StatusKind { Pending, Connected, Error, Info }
    private void SetStatus(string text, StatusKind kind)
    {
        StatusText.Text = $"状态:{text}";
        StatusDot.Fill = kind switch
        {
            StatusKind.Connected => new SolidColorBrush(Color.FromRgb(0x10, 0x81, 0x16)),
            StatusKind.Error      => new SolidColorBrush(Color.FromRgb(0xD1, 0x34, 0x38)),
            StatusKind.Pending    => new SolidColorBrush(Color.FromRgb(0xCA, 0x50, 0x10)),
            _                     => new SolidColorBrush(Color.FromRgb(0x88, 0x88, 0x88))
        };
    }

    private async Task LoadHistoryAsync()
    {
        if (_apiService is null || _config is null) return;
        if (string.IsNullOrWhiteSpace(_config.Gotify.ClientToken))
        {
            SetStatus("未配置 Client Token,无法拉取历史", StatusKind.Error);
            return;
        }

        try
        {
            SetStatus("正在拉取历史...", StatusKind.Pending);
            var limit = Math.Clamp(_config.History.ViewerLimit, 1, 100);
            var messages = await _apiService.GetRecentMessagesAsync(limit, CancellationToken.None);
            foreach (var m in messages) Enrich(m);

            _history.Clear();
            foreach (var m in messages) _history.Add(m);
            UpdateHistoryCount();
            SetStatus($"已加载 {messages.Count} 条历史消息", StatusKind.Connected);
            _logger?.Info($"History loaded. count={messages.Count}");
        }
        catch (Exception ex)
        {
            _logger?.Error("Load history failed.", ex);
            SetStatus($"拉取历史失败 - {ex.Message}", StatusKind.Error);
        }
    }

    private async Task RefreshAppsAsync(bool silent = false)
    {
        if (_appCache is null) return;
        if (_config is null || string.IsNullOrWhiteSpace(_config.Gotify.ClientToken))
        {
            if (!silent) SetStatus("未配置 Client Token,无法拉取应用", StatusKind.Error);
            return;
        }
        try
        {
            if (!silent) SetStatus("正在拉取应用列表...", StatusKind.Pending);
            await _appCache.RefreshAsync();
            UpdateAppCount();
            if (!silent) SetStatus($"已加载 {_appCache.Count} 个应用", StatusKind.Connected);
        }
        catch (Exception ex)
        {
            _logger?.Error("Refresh applications failed.", ex);
            if (!silent) SetStatus($"拉取应用失败 - {ex.Message}", StatusKind.Error);
        }
    }

    private async void RefreshAppsButton_Click(object sender, RoutedEventArgs e)
    {
        await RefreshAppsAsync();
    }

    private async void RefreshButton_Click(object sender, RoutedEventArgs e)
    {
        await LoadHistoryAsync();
    }

    private void HistoryList_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (HistoryList.SelectedItem is GotifyMessage msg)
        {
            RenderDetail(msg);
        }
        else
        {
            DetailPanel.Visibility = Visibility.Collapsed;
            DetailEmptyHint.Visibility = Visibility.Visible;
        }
    }

    private void RenderDetail(GotifyMessage msg)
    {
        DetailEmptyHint.Visibility = Visibility.Collapsed;
        DetailPanel.Visibility = Visibility.Visible;

        DetailAppName.Text = string.IsNullOrWhiteSpace(msg.AppName) ? msg.TitleDisplay : msg.AppName;
        DetailAppName.Foreground = (Brush)(new AppNameToBrushConverter().Convert(msg.AppName, typeof(Brush), null, System.Globalization.CultureInfo.CurrentCulture) ?? Brushes.Black);

        var app = _appCache?.Get(msg.AppId);
        DetailAppDesc.Text = app?.Description ?? "(无应用描述)";
        DetailAppDesc.Visibility = string.IsNullOrWhiteSpace(app?.Description) ? Visibility.Collapsed : Visibility.Visible;

        DetailPriority.Text = $"{msg.PriorityDisplay}  ({(msg.Priority >= 8 ? "紧急-告警音" : msg.Priority >= 5 ? "重要" : "一般")})";
        DetailDate.Text = msg.Date.ToLocalTime().ToString("yyyy-MM-dd HH:mm:ss");
        DetailTitle.Text = msg.TitleDisplay;
        DetailAppId.Text = msg.AppId.ToString();
        DetailMessage.Text = msg.Message ?? "";

        var url = msg.ClickUrl;
        if (!string.IsNullOrWhiteSpace(url))
        {
            DetailUrl.Text = url;
            DetailUrl.Tag = url;
            DetailUrlLabel.Visibility = Visibility.Visible;
            DetailUrl.Visibility = Visibility.Visible;
        }
        else
        {
            DetailUrlLabel.Visibility = Visibility.Collapsed;
            DetailUrl.Visibility = Visibility.Collapsed;
        }
    }

    private void DetailUrl_Click(object sender, MouseButtonEventArgs e)
    {
        if (DetailUrl.Tag is string url && !string.IsNullOrWhiteSpace(url))
        {
            OpenUrl(url);
        }
    }

    private void DetailUrl_DoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (DetailUrl.Text is string url && !string.IsNullOrWhiteSpace(url))
        {
            OpenUrl(url);
        }
    }

    private void OpenUrl(string url)
    {
        try
        {
            Process.Start(new ProcessStartInfo { FileName = url, UseShellExecute = true });
        }
        catch (Exception ex)
        {
            _logger?.Error("Failed to open click url.", ex);
            MessageBox.Show($"无法打开链接:{ex.Message}", "Windows Gotify",
                MessageBoxButton.OK, MessageBoxImage.Warning);
        }
    }

    private void CopyMessageButton_Click(object sender, RoutedEventArgs e)
    {
        if (HistoryList.SelectedItem is not GotifyMessage msg) return;
        var text = BuildFullMessageText(msg);

        // 剪贴板常被其他进程占着(RDP、杀软、其他复制操作),CLIPBRD_E_CANT_OPEN 是常见 race。
        // Clipboard.SetText 不自带重试,自己包一层:最多 10 次,每次等 50ms。
        const int MaxAttempts = 10;
        const int DelayMs = 50;
        Exception? lastEx = null;
        bool ok = false;
        for (int attempt = 1; attempt <= MaxAttempts; attempt++)
        {
            try
            {
                Clipboard.SetText(text);
                ok = true;
                break;
            }
            catch (System.Runtime.InteropServices.COMException ex)
            {
                lastEx = ex;
                System.Threading.Thread.Sleep(DelayMs);
            }
        }

        if (ok)
        {
            _logger?.Info($"Copied message to clipboard. id={msg.Id}");
            if (sender is Button btn)
            {
                var origContent = btn.Content;
                btn.Content = "已复制";
                var timer = new System.Windows.Threading.DispatcherTimer
                {
                    Interval = TimeSpan.FromSeconds(1.5)
                };
                timer.Tick += (_, _) =>
                {
                    btn.Content = origContent;
                    timer.Stop();
                };
                timer.Start();
            }
        }
        else
        {
            _logger?.Error("Copy to clipboard failed after retries.", lastEx);
            MessageBox.Show(
                $"复制失败:剪贴板被其他程序占用,重试 {MaxAttempts} 次仍未成功。\n请关闭正在使用剪贴板的程序后重试。\n\n错误:0x{(lastEx?.HResult ?? 0):X8}",
                "Windows Gotify", MessageBoxButton.OK, MessageBoxImage.Warning);
        }
    }

    private static string BuildFullMessageText(GotifyMessage msg)
    {
        var sb = new System.Text.StringBuilder();
        sb.Append("[");
        sb.Append(string.IsNullOrWhiteSpace(msg.AppName) ? $"App {msg.AppId}" : msg.AppName);
        sb.Append("] ");
        sb.Append(string.IsNullOrWhiteSpace(msg.Title) ? "(无标题)" : msg.Title);
        sb.AppendLine();
        sb.Append("时间: ");
        sb.AppendLine(msg.Date.ToLocalTime().ToString("yyyy-MM-dd HH:mm:ss"));
        sb.Append("优先级: P");
        sb.AppendLine(msg.Priority.ToString());
        sb.AppendLine();
        sb.AppendLine(msg.Message ?? "");
        if (!string.IsNullOrWhiteSpace(msg.ClickUrl))
        {
            sb.AppendLine();
            sb.AppendLine(msg.ClickUrl);
        }
        return sb.ToString();
    }

    private void ThemeToggleButton_Click(object sender, RoutedEventArgs e)
    {
        ThemeService.Toggle();
        UpdateThemeButtonLabel();
        // 持久化
        if (_config != null && _configService != null)
        {
            _config.Ui.Theme = ThemeService.Current;
            _ = _configService.SaveAsync(_config);
        }
    }

    private void UpdateThemeButtonLabel()
    {
        ThemeToggleButton.Content = ThemeService.Current == ThemeService.Dark ? "☾ 深色" : "☼ 浅色";
    }

    private async void SaveButton_Click(object sender, RoutedEventArgs e)
    {
        if (_config is null || _configService is null) return;

        var url = UrlTextBox.Text.Trim();
        var token = TokenBox.Password.Trim();

        if (!Uri.TryCreate(url, UriKind.Absolute, out var uri) ||
            (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps))
        {
            MessageBox.Show("Gotify URL 无效。", "Windows Gotify",
                MessageBoxButton.OK, MessageBoxImage.Warning);
            return;
        }

        if (string.IsNullOrWhiteSpace(token))
        {
            MessageBox.Show("Client Token 不能为空。", "Windows Gotify",
                MessageBoxButton.OK, MessageBoxImage.Warning);
            return;
        }

        _config.Gotify.Url = url.TrimEnd('/');
        _config.Gotify.ClientToken = token;

        await _configService.SaveAsync(_config);
        _webSocket?.RequestReconnect();
        // URL/Token 变了,重新拉应用和历史
        _ = RefreshAppsAsync(silent: true);
        await LoadHistoryAsync();

        MessageBox.Show("配置已保存,正在重新连接。", "Windows Gotify",
            MessageBoxButton.OK, MessageBoxImage.Information);
    }

    private async void TestButton_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            var notification = new NotificationService(_config!, _logger!);
            await notification.ShowAsync(new GotifyMessage
            {
                Id = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(),
                Message = "Windows Gotify Agent 测试成功。",
                Title = "Gotify 测试",
                Priority = 5,
                Date = DateTimeOffset.UtcNow
            });
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "测试通知失败",
                MessageBoxButton.OK, MessageBoxImage.Error);
        }
    }
}