using System;
using System.Threading;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Markup.Xaml;
using Avalonia.Threading;
using LibVLCSharp.Avalonia;
using LibVLCSharp.Shared;
using StreamPlayer.Desktop.Models;
using StreamPlayer.Desktop.Services;

namespace StreamPlayer.Desktop.Views;

public partial class PlayerWindow : Window
{
    private readonly StreamChannel _channel;
    private readonly StreamUrlResolver _resolver = new();
    private readonly CancellationTokenSource _lifetimeCts = new();
    private LibVLC? _libVlc;
    private MediaPlayer? _mediaPlayer;
    private bool _overlayVisible = true;

    private TextBlock? _channelNameText;
    private Border? _loadingOverlay;
    private Border? _errorOverlay;
    private TextBlock? _statusText;
    private VideoView? _videoView;
    private TextBlock? _errorText;
    private Border? _overlay;

    public PlayerWindow() : this(new StreamChannel("Canal", string.Empty))
    {
    }

    public PlayerWindow(StreamChannel channel)
    {
        _channel = channel;
        InitializeComponent();
        if (_channelNameText != null)
        {
            _channelNameText.Text = channel.Name;
        }
        Title = $"Reproduciendo {channel.Name}";
    }

    protected override void OnOpened(EventArgs e)
    {
        base.OnOpened(e);
        _ = LoadAndPlayAsync();
    }

    private async Task LoadAndPlayAsync()
    {
        try
        {
            await Dispatcher.UIThread.InvokeAsync(() =>
            {
                if (_loadingOverlay != null)
                {
                    _loadingOverlay.IsVisible = true;
                }
                if (_errorOverlay != null)
                {
                    _errorOverlay.IsVisible = false;
                }
                if (_statusText != null)
                {
                    _statusText.Text = "Resolviendo stream…";
                }
            });

            string resolved = await _resolver.ResolveAsync(_channel.PageUrl, _lifetimeCts.Token);
            await Dispatcher.UIThread.InvokeAsync(() => StartPlayback(resolved));
        }
        catch (OperationCanceledException)
        {
            // ignored
        }
        catch (Exception ex)
        {
            await Dispatcher.UIThread.InvokeAsync(() => ShowError($"No se pudo iniciar el stream: {ex.Message}"));
        }
    }

    private void StartPlayback(string streamUrl)
    {
        ReleasePlayer();
        _libVlc = new LibVLC();
        _mediaPlayer = new MediaPlayer(_libVlc);
        _mediaPlayer.Playing += MediaPlayerOnPlaying;
        _mediaPlayer.Buffering += MediaPlayerOnBuffering;
        _mediaPlayer.EncounteredError += MediaPlayerOnEncounteredError;
        _mediaPlayer.EndReached += MediaPlayerOnEndReached;
        if (_videoView != null)
        {
            _videoView.MediaPlayer = _mediaPlayer;
        }

        using var media = new Media(_libVlc, new Uri(streamUrl));
        media.AddOption($":http-referrer={_channel.PageUrl}");
        media.AddOption(":http-header=Origin: https://streamtpmedia.com");
        media.AddOption(":http-header=Accept: */*");
        media.AddOption(":http-header=Connection: keep-alive");
        media.AddOption(":network-caching=1500");
        media.AddOption(":clock-jitter=0");
        media.AddOption(":clock-synchro=0");
        media.AddOption(":adaptive-use-access=true");
        media.AddOption(":http-user-agent=Mozilla/5.0 (Linux; Android 13; Pixel 7 Build/TQ3A.230805.001) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0 Mobile Safari/537.36 ExoPlayer/2.18.7");
        media.AddOption(":input-repeat=-1");
        _mediaPlayer.Play(media);
    }

    private void MediaPlayerOnEndReached(object? sender, EventArgs e)
    {
        Dispatcher.UIThread.Post(() =>
        {
            if (_loadingOverlay != null)
            {
                _loadingOverlay.IsVisible = false;
            }
        });
    }

    private void MediaPlayerOnEncounteredError(object? sender, EventArgs e)
    {
        Dispatcher.UIThread.Post(() => ShowError("Error en la reproducción. Intenta nuevamente más tarde."));
    }

    private void MediaPlayerOnBuffering(object? sender, MediaPlayerBufferingEventArgs e)
    {
        Dispatcher.UIThread.Post(() =>
        {
            if (_loadingOverlay != null)
            {
                _loadingOverlay.IsVisible = true;
            }
            if (_statusText != null)
            {
                _statusText.Text = "Conectando…";
            }
        });
    }

    private void MediaPlayerOnPlaying(object? sender, EventArgs e)
    {
        Dispatcher.UIThread.Post(() =>
        {
            if (_loadingOverlay != null)
            {
                _loadingOverlay.IsVisible = false;
            }
            SetOverlayVisible(false);
        });
    }

    private void ShowError(string message)
    {
        if (_loadingOverlay != null)
        {
            _loadingOverlay.IsVisible = false;
        }
        if (_errorOverlay != null)
        {
            _errorOverlay.IsVisible = true;
        }
        if (_errorText != null)
        {
            _errorText.Text = message;
        }
    }

    private void ReleasePlayer()
    {
        if (_mediaPlayer != null)
        {
            _mediaPlayer.Playing -= MediaPlayerOnPlaying;
            _mediaPlayer.Buffering -= MediaPlayerOnBuffering;
            _mediaPlayer.EncounteredError -= MediaPlayerOnEncounteredError;
            _mediaPlayer.EndReached -= MediaPlayerOnEndReached;
            _mediaPlayer.Dispose();
            _mediaPlayer = null;
        }
        if (_libVlc != null)
        {
            _libVlc.Dispose();
            _libVlc = null;
        }
    }

    private void OnVideoPointerPressed(object? sender, PointerPressedEventArgs e)
    {
        SetOverlayVisible(!_overlayVisible);
    }

    private void SetOverlayVisible(bool visible)
    {
        _overlayVisible = visible;
        if (_overlay != null)
        {
            _overlay.IsVisible = visible;
        }
    }

    private void OnCloseClicked(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        Close();
    }

    protected override void OnClosing(WindowClosingEventArgs e)
    {
        base.OnClosing(e);
        _lifetimeCts.Cancel();
        ReleasePlayer();
        _lifetimeCts.Dispose();
    }

    private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
        _channelNameText = this.FindControl<TextBlock>("ChannelNameText");
        _loadingOverlay = this.FindControl<Border>("LoadingOverlay");
        _errorOverlay = this.FindControl<Border>("ErrorOverlay");
        _statusText = this.FindControl<TextBlock>("StatusText");
        _videoView = this.FindControl<VideoView>("VideoView");
        _errorText = this.FindControl<TextBlock>("ErrorText");
        _overlay = this.FindControl<Border>("Overlay");
    }
}