using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Media.Imaging;
using Avalonia.Platform.Storage;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using GazpromApp.Messages;
using GazpromApp.Models;
using Image = GazpromApp.Models.Image;

namespace GazpromApp.ViewModels;

public partial class EditPointDialogViewModel : ViewModelBase
{
    public ObservableCollection<ImageViewModel> Images { get; set; }
    
    [ObservableProperty]
    [NotifyCanExecuteChangedFor(nameof(CompleteEditCommand))]
    private string? _name;
    
    [ObservableProperty]
    [NotifyCanExecuteChangedFor(nameof(CompleteEditCommand))]
    private string? _description;
    
    [ObservableProperty]
    private bool _isNameEditing;
    
    [ObservableProperty]
    private bool _isDescriptionEditing;

    [RelayCommand]
    private void EditName()
    {
        IsNameEditing = !IsNameEditing;
        IsDescriptionEditing = false;
    }
    
    [RelayCommand]
    private void EditDescription()
    {
        IsDescriptionEditing = !IsDescriptionEditing;
        IsNameEditing = false;
    }

    [RelayCommand]
    private async Task AddImage(Window w)
    {
        IReadOnlyList<IStorageFile> files = await w.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions()
        {
            AllowMultiple = true,
            Title = "Выберите одну или несколько картинок",
            FileTypeFilter = [FilePickerFileTypes.ImageAll],
        });
        foreach (var file in files)
            Images.Add(new ImageViewModel(new Image()) { FileName = new Bitmap(file.Path.AbsolutePath) });
        
        IsImagesEmpty = Images.Count == 0;
    }
    
    [RelayCommand]
    private void DeleteImage(ImageViewModel image)
    {
        Images.Remove(image);
        IsImagesEmpty = Images.Count == 0;
    }

    [RelayCommand]
    private async Task ViewImage(ImageViewModel image)
    {
        _ = await WeakReferenceMessenger.Default.Send(new ViewImageMessage(image));
    }

    private bool CanCompleteEdit() => !string.IsNullOrWhiteSpace(Name);

    [RelayCommand(CanExecute = nameof(CanCompleteEdit))]
    private void CompleteEdit()
    {
        Point point = new Point()
        {
            Name = Name,
            Description = Description,
            Images = Images.Select(e => e.GetImage()).ToList()
        };
        WeakReferenceMessenger.Default.Send(new EditPointDone(new PointViewModel(point)));
    }

    [RelayCommand]
    private static void CancelEdit(Window w)
    {
        w.Close();
    }

    [ObservableProperty]
    private bool _isImagesEmpty;

    public EditPointDialogViewModel()
    {
        Name = "";
        Description = "";
        Images = [];
        IsImagesEmpty = true;
    }

    public EditPointDialogViewModel(PointViewModel point)
    {
        Name = point.Name;
        Description = point.Description;
        Images = new ObservableCollection<ImageViewModel>((point.Images ?? []).Select(e => new ImageViewModel(e)));
        foreach (ImageViewModel imageViewModel in Images)
        {
            Debug.WriteLine(imageViewModel.FileName);
        }
        IsImagesEmpty = Images.Count == 0;
    }
}