using System;
using System.IO;
using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

using Avalonia.Controls;

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 MainWindow()
    {
        self = this;

        InitializeComponent();

        LoadSettings();

        _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);
        }
    }

    protected override void OnClosed(EventArgs e)
    {
        base.OnClosed(e);
        _cts?.Cancel();
        _cts?.Dispose();
    }

    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)
        {
            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()
    {
        if (settings == null)
        {
            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 = System.Text.Json.JsonDocument.Parse(statusJson);
                    string? state = jsonDoc.RootElement.GetProperty("state").GetString();
                    string? entity = jsonDoc.RootElement.GetProperty("entity_id").GetString();
                    StatusText.Content = $"{state}";
                    if (state == "on")
                        StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Green);
                    else if (state == "off")
                        StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
                    else
                        StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Orange);
                }
                catch
                {
                    StatusText.Content = "Fehler!";
                    StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
                }
            }
        }
        catch (Exception ex)
        {
            StatusText.Content = "Fehler!";
            StatusText.Foreground = new Avalonia.Media.SolidColorBrush(Avalonia.Media.Colors.Red);
            Console.WriteLine($"Error fetching state: {ex.Message}");
        }
    }

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