using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using FModel.Framework;
using FModel.Settings;
using FModel.ViewModels.Commands;

namespace FModel.ViewModels;

public class CustomDirectoriesViewModel : ViewModel
{
    private GoToCommand _goToCommand;
    public GoToCommand GoToCommand => _goToCommand ??= new GoToCommand(this);
    private AddEditDirectoryCommand _addEditDirectoryCommand;
    public AddEditDirectoryCommand AddEditDirectoryCommand => _addEditDirectoryCommand ??= new AddEditDirectoryCommand(this);
    private DeleteDirectoryCommand _deleteDirectoryCommand;
    public DeleteDirectoryCommand DeleteDirectoryCommand => _deleteDirectoryCommand ??= new DeleteDirectoryCommand(this);

    private readonly ObservableCollection<Control> _directories;
    public ReadOnlyObservableCollection<Control> Directories { get; }

    public CustomDirectoriesViewModel()
    {
        _directories = new ObservableCollection<Control>(EnumerateDirectories());
        Directories = new ReadOnlyObservableCollection<Control>(_directories);
    }

    public int GetIndex(CustomDirectory dir)
    {
        return _directories.IndexOf(_directories.FirstOrDefault(x =>
            x is MenuItem m && m.Header.ToString() == dir.Header && m.Tag.ToString() == dir.DirectoryPath));
    }

    public void Add(CustomDirectory dir)
    {
        _directories.Add(new MenuItem { Header = dir.Header, Tag = dir.DirectoryPath, ItemsSource = EnumerateCommands(dir) });
        Save();
    }

    public void Edit(int index, CustomDirectory newDir)
    {
        if (_directories.ElementAt(index) is not MenuItem dir) return;

        dir.Header = newDir.Header;
        dir.Tag = newDir.DirectoryPath;
        Save();
    }

    public void Delete(int index)
    {
        _directories.RemoveAt(index);
        Save();
    }

    public void Save()
    {
        var directories = new List<CustomDirectory>();
        for (var i = 2; i < _directories.Count; i++)
        {
            if (_directories[i] is not MenuItem m) continue;
            directories.Add(new CustomDirectory(m.Header.ToString(), m.Tag.ToString()));
        }

        UserSettings.Default.CurrentDir.Directories = directories;
    }

    private IEnumerable<Control> EnumerateDirectories()
    {
        yield return new MenuItem
        {
            Header = "Add Directory",
            Icon = new Image { Source = new BitmapImage(new Uri("/FModel;component/Resources/add_directory.png", UriKind.Relative)) },
            HorizontalContentAlignment = HorizontalAlignment.Left,
            VerticalContentAlignment = VerticalAlignment.Center,
            Command = AddEditDirectoryCommand
        };
        yield return new Separator();

        foreach (var setting in UserSettings.Default.CurrentDir.Directories)
        {
            if (setting.DirectoryPath.EndsWith('/'))
                setting.DirectoryPath = setting.DirectoryPath[..^1];

            yield return new MenuItem
            {
                Header = setting.Header,
                Tag = setting.DirectoryPath,
                HorizontalContentAlignment = HorizontalAlignment.Left,
                VerticalContentAlignment = VerticalAlignment.Center,
                ItemsSource = EnumerateCommands(setting)
            };
        }
    }

    private IEnumerable<MenuItem> EnumerateCommands(CustomDirectory dir)
    {
        yield return new MenuItem
        {
            Header = "Go To",
            Icon = new Image { Source = new BitmapImage(new Uri("/FModel;component/Resources/go_to_directory.png", UriKind.Relative)) },
            HorizontalContentAlignment = HorizontalAlignment.Left,
            VerticalContentAlignment = VerticalAlignment.Center,
            Command = GoToCommand,
            CommandParameter = dir.DirectoryPath
        };
        yield return new MenuItem
        {
            Header = "Edit Directory",
            Icon = new Image { Source = new BitmapImage(new Uri("/FModel;component/Resources/edit.png", UriKind.Relative)) },
            HorizontalContentAlignment = HorizontalAlignment.Left,
            VerticalContentAlignment = VerticalAlignment.Center,
            Command = AddEditDirectoryCommand,
            CommandParameter = dir
        };
        yield return new MenuItem
        {
            Header = "Delete Directory",
            StaysOpenOnClick = true,
            Icon = new Image { Source = new BitmapImage(new Uri("/FModel;component/Resources/delete.png", UriKind.Relative)) },
            HorizontalContentAlignment = HorizontalAlignment.Left,
            VerticalContentAlignment = VerticalAlignment.Center,
            Command = DeleteDirectoryCommand,
            CommandParameter = dir
        };
    }
}