using HarmonyWinUI.Models;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Data;
using Microsoft.UI.Xaml.Media.Imaging;
using Microsoft.UI.Xaml.Navigation;
using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Net.Http;
using System.Text.Json;
using System.Threading.Tasks;

// To learn more about WinUI, the WinUI project structure,
// and more about our project templates, see: http://aka.ms/winui-project-info.

namespace HarmonyWinUI.Pages;

public sealed class ImageUrlToImageSourceConverter : IValueConverter
{
	public object? Convert(object value, Type targetType, object parameter, string language)
	{
		if (value is string imageUrl
			&& Uri.TryCreate(imageUrl, UriKind.Absolute, out Uri? imageUri))
		{
			return new BitmapImage(imageUri);
		}

		return null;
	}

	public object ConvertBack(object value, Type targetType, object parameter, string language)
	{
		throw new NotSupportedException();
	}
}

/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class Search : Page
{
	public ObservableCollection<MusicBrainzArtist> Artists { get; } = new();
	private string? pendingSearchText;

	public Search()
	{
		InitializeComponent();
		Loaded += Search_Loaded;
	}

	protected override void OnNavigatedTo(NavigationEventArgs e)
	{
		base.OnNavigatedTo(e);
		pendingSearchText = e.Parameter as string;
	}

	private async void Search_Loaded(object sender, RoutedEventArgs e)
	{
		if (pendingSearchText is not string searchText)
		{
			return;
		}

		pendingSearchText = null;
		await SearchText(searchText);
	}

	private async Task SearchText(string searchText)
	{
		TextBlockQuery.Text = $"Query: '{searchText}'";
		var mb = new MusicBrainz();

		while (true)
		{
			try
			{
				var artists = await mb.getArtists(searchText);

				this.Artists.Clear();
				foreach (var artist in artists)
				{
					this.Artists.Add(artist);
				}

				return;
			}
			catch (Exception exception) when (
				exception is HttpRequestException
				or IOException
				or JsonException
				or TaskCanceledException
			)
			{
				ContentDialog errorDialog = new ContentDialog
				{
					XamlRoot = XamlRoot,
					Title = "MusicBrainz connection failed",
					Content = $"{exception.GetType().Name}: {exception.Message}",
					PrimaryButtonText = "Retry",
					CloseButtonText = "Cancel",
					DefaultButton = ContentDialogButton.Primary
				};

				ContentDialogResult result = await errorDialog.ShowAsync();
				if (result != ContentDialogResult.Primary)
				{
					this.Artists.Clear();
					return;
				}
			}
		}
	}
}