using System;
using System.IO;
using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Primitives;

namespace HAcontrol;

public partial class MainWindow : Window
{
    private Settings? settings = null;

    private System.Threading.CancellationTokenSource? _cts;

    private static MainWindow? self;

    public static MainWindow? Self => self;

    public bool ShowFader => !string.IsNullOrEmpty(settings?.FaderEntity);

    private PixelPoint? _windowPosition;

    public MainWindow()
    {
        self = this;

        InitializeComponent();

        Topmost = true;

        LoadSettings();

        // Restore window position if available
        if (settings != null)
        {
            if (settings.WindowTop != 0 || settings.WindowLeft != 0)
                this.Position = new Avalonia.PixelPoint((int)settings.WindowLeft, (int)settings.WindowTop);
        }

        _cts = new System.Threading.CancellationTokenSource();
        StartStatePolling(_cts.Token);
    }

    public void LoadSettings()
    {
        if (!File.Exists(SettingsWindow.SettingsFile))
        {
            // Create default settings file if it does not exist
            var defaultSettings = new Settings();
            var json = JsonSerializer.Serialize(defaultSettings, new JsonSerializerOptions { WriteIndented = true });
            File.WriteAllText(SettingsWindow.SettingsFile, json);
        }
        {
            var json = File.ReadAllText(SettingsWindow.SettingsFile);
            settings = JsonSerializer.Deserialize<Settings>(json);
        }

        FaderControl.IsVisible = ShowFader;
        var newHeight = ShowFader ? 500 : 100;
        MaxHeight = newHeight;
        MinHeight = newHeight;
        Height = newHeight;
    }

    protected override void OnClosed(EventArgs e)
    {
        base.OnClosed(e);
        // Save window position
        if (settings != null && _windowPosition != null)
        {
            settings.WindowTop = _windowPosition.Value.Y;
            settings.WindowLeft = _windowPosition.Value.X;
            var json = System.Text.Json.JsonSerializer.Serialize(settings, new System.Text.Json.JsonSerializerOptions { WriteIndented = true });
            System.IO.File.WriteAllText(SettingsWindow.SettingsFile, json);
        }
        _cts?.Cancel();
        _cts?.Dispose();
        self = null;
    }

    private async void StartStatePolling(System.Threading.CancellationToken token)
    {
        while (!token.IsCancellationRequested)
        {
            await GetState();
            try
            {
                await Task.Delay(10000, token);
            }
            catch (TaskCanceledException)
            {
                break;
            }
        }
    }

    private async void Button_Click(object sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        if (settings == null || string.IsNullOrEmpty(settings.HomeAssistantUrl) || string.IsNullOrEmpty(settings.WebhookId))
        {
            StatusText.Content = "Einstellungen fehlen!";
            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
            return;
        }

        string webhookUrl = $"{settings.HomeAssistantUrl}/api/webhook/{settings.WebhookId}";
        string payload = "{\"event\": \"\"}";

        // HttpClientHandler to ignore SSL certificate errors (for development only!)
        var handler = new HttpClientHandler();
        handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true;

        using (var client = new HttpClient(handler))
        {
            var content = new StringContent(payload, Encoding.UTF8, "application/json");
            using var _ = await client.PostAsync(webhookUrl, content);
            await Task.Delay(100);
        }

        await GetState();
    }

    private async Task GetState()
    {
        _windowPosition = Position;

        if (settings == null || string.IsNullOrEmpty(settings.HomeAssistantUrl) || string.IsNullOrEmpty(settings.Entity) || string.IsNullOrEmpty(settings.AccessToken))
        {
            StatusText.Content = "Einstellungen fehlen!";
            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
            return;
        }

        try
        {
            // HttpClientHandler to ignore SSL certificate errors (for development only!)
            var handler = new HttpClientHandler();
            handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true;

            using (var client = new HttpClient(handler))
            {
                string statusUrl = $"{settings.HomeAssistantUrl}/api/states/{settings.Entity}";
                client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", settings.AccessToken);

                using (var response = await client.GetAsync(statusUrl))
                {
                    string statusJson = await response.Content.ReadAsStringAsync();

                    // Parse the JSON and extract the state
                    try
                    {
                        var jsonDoc = JsonDocument.Parse(statusJson);
                        string? state = jsonDoc.RootElement.GetProperty("state").GetString();
                        string? entity = jsonDoc.RootElement.GetProperty("entity_id").GetString();
                        StatusText.Content = $"{state}";
                        if (state == "on")
                            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Green);
                        else if (state == "off")
                            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
                        else
                            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Orange);
                    }
                    catch
                    {
                        StatusText.Content = "Fehler!";
                        StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
                    }
                }

                if (!string.IsNullOrEmpty(settings.FaderEntity))
                {
                    statusUrl = $"{settings.HomeAssistantUrl}/api/states/{settings.FaderEntity}";
                    using (var response = await client.GetAsync(statusUrl))
                    {
                        string statusJson = await response.Content.ReadAsStringAsync();

                        // Parse the JSON and extract the state
                        try
                        {
                            // {"entity_id":"number.wing_pp_control_main_4_fader","state":"20.0000002980232","attributes":{"min":0,"max":100,"step":1.0,"mode":"auto","db":"-38.0","low_precision":20.0,"attribution":"","icon":"mdi:volume-source","friendly_name":"Main 4 Fader"},"last_changed":"2025-08-16T14:14:32.455801+00:00","last_reported":"2025-08-16T14:14:32.455801+00:00","last_updated":"2025-08-16T14:14:32.455801+00:00","context":{"id":"01K2SKPTR48X14WGRN6AZDP4Y4","parent_id":null,"user_id":"d548e3619c124b8ead8043c4d6e9223b"}}
                            var jsonDoc = JsonDocument.Parse(statusJson);
                            string? state = jsonDoc.RootElement.GetProperty("state").GetString();
                            string? entity = jsonDoc.RootElement.GetProperty("entity_id").GetString();
                            if (double.TryParse(state, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out double faderValue))
                            {
                                FaderControl.Value = faderValue;
                                FaderControl.IsVisible = true;
                            }
                            else
                            {
                                FaderControl.Value = 0.0;
                                FaderControl.IsVisible = false;
                            }
                        }
                        catch
                        {
                            FaderControl.Value = 0.0;
                            FaderControl.IsVisible = false;
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            StatusText.Content = "Fehler!";
            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
            Console.WriteLine($"Error fetching state: {ex.Message}");
        }
    }

    private void SettingsButton_Click(object sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        var settingsWindow = new SettingsWindow();
        settingsWindow.ShowDialog(this);
    }

    private async void Fader_ValueChanged(object? sender, RangeBaseValueChangedEventArgs e)
    {
        if (settings == null || string.IsNullOrEmpty(settings.HomeAssistantUrl) || string.IsNullOrEmpty(settings.FaderEntity))
        {
            StatusText.Content = "Einstellungen fehlen!";
            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
            return;
        }

        string newState = e.NewValue.ToString(System.Globalization.CultureInfo.InvariantCulture);

        await ChangeEntityState(settings.FaderEntity, newState);
    }

    private async Task ChangeEntityState(string entity, string newState)
    {
        if (settings == null || string.IsNullOrEmpty(settings.HomeAssistantUrl) || string.IsNullOrEmpty(settings.AccessToken))
        {
            Console.WriteLine("Einstellungen fehlen!");
            return;
        }

        var url = $"{settings.HomeAssistantUrl}/api/states/{entity}";

        var handler = new HttpClientHandler();
        handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true;

        using var client = new HttpClient(handler);

        // Setze den Authorization-Header
        client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", settings.AccessToken);

        // Erstelle den JSON-Inhalt
        var jsonContent = new
        {
            state = newState
        };
        var content = new StringContent(JsonSerializer.Serialize(jsonContent), Encoding.UTF8, "application/json");

        try
        {
            // Sende die POST-Anfrage
            HttpResponseMessage response = await client.PostAsync(url, content);

            // Überprüfe den Statuscode der Antwort
            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("Status erfolgreich geändert.");
            }
            else
            {
                Console.WriteLine($"Fehler: {response.StatusCode} - {await response.Content.ReadAsStringAsync()}");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Ein Fehler ist aufgetreten: {ex.Message}");
        }
    }

    private void FaderControl_PointerWheelChanged(object? sender, Avalonia.Input.PointerWheelEventArgs e)
    {
        if (FaderControl.IsVisible && FaderControl.IsEnabled)
        {
            double delta = e.Delta.Y > 0 ? 0.5 : -0.5;
            double newValue = FaderControl.Value + delta;
            if (newValue < FaderControl.Minimum) newValue = FaderControl.Minimum;
            if (newValue > FaderControl.Maximum) newValue = FaderControl.Maximum;
            FaderControl.Value = newValue;
        }
    }
}