using System;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Threading;
using XSDVisualiser.Core;
using XSDVisualiser.Models;
using XSDVisualiser.Desktop.ViewModels;
using XSDVisualiser.Desktop.Views;

namespace XSDVisualiser.Desktop
{
    public partial class MainWindow : Window
    {
        private Button _openBtn = null!;

        public MainWindow()
        {
            InitializeComponent();
            var header = this.FindControl<HeaderView>("Header");
            var btn = header?.FindControl<Button>("OpenBtn");
            if (btn == null) return;
            _openBtn = btn;
            _openBtn.Click += OpenBtn_Click;
        }

        private async void OpenBtn_Click(object? sender, RoutedEventArgs e)
        {
            var ofd = new OpenFileDialog
            {
                AllowMultiple = false,
                Title = "Open XSD file"
            };
            ofd.Filters!.Add(new FileDialogFilter { Name = "XSD schema", Extensions = { "xsd" } });
            var files = await ofd.ShowAsync(this);
            if (files is { Length: > 0 })
            {
                await ParseAndShowAsync(files[0]);
            }
        }

        private Task ParseAndShowAsync(string path)
        {
            return Task.Run(() =>
            {
                try
                {
                    var parser = new XsdSchemaParser();
                    var model = parser.Parse(path);
                    Dispatcher.UIThread.Post(() => DataContext = new MainWindowViewModel(model));
                }
                catch (Exception ex)
                {
                    Dispatcher.UIThread.Post(() => DataContext = new MainWindowViewModel(new SchemaModel { TargetNamespace = ex.Message }));
                }
            });
        }
    }
}