using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Text;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Navigation;
using WinWARP.Core.Services.Interfaces;

namespace WinWARP.Ui.Services;

public class NavigationService : INavigationService
{
    private readonly Dictionary<Type, Type> _mappings = new();
    private Frame _frame;

    public void Configure(Type viewModelType, Type pageType)
    {
        _mappings[viewModelType] = pageType;
        _mappings[pageType] = viewModelType;
    }

    public void RegisterFrame(Frame frame)
    {
        _frame = frame;
        _frame.Navigated += OnFrameNavigated;
    }

    public bool CanGoBack => _frame?.CanGoBack ?? false;

    public void GoBack()
    {
        if (CanGoBack)
        {
            _frame.GoBack();
        }
    }

    public void NavigateTo<TViewModel>(object parameter = null) where TViewModel : class
    {
        var viewModelType = typeof(TViewModel);

        if (!_mappings.TryGetValue(viewModelType, out var pageType))
        {
            throw new ArgumentException($"No registered page found for ViewModel: {viewModelType.FullName}");
        }

        if (_frame != null)
        {
            _frame.Navigate(pageType, parameter);
        }
    }

    public Type CurrentViewModelType
    {
        get; private set;
    }

    public event EventHandler<Type> NavigatedToViewModel;

    private void OnFrameNavigated(object sender, NavigationEventArgs e)
    {
        var pageType = e.SourcePageType;

        if (_mappings.TryGetValue(pageType, out var viewModelType))
        {
            CurrentViewModelType = viewModelType;

            NavigatedToViewModel?.Invoke(this, viewModelType);
        }
    }
}