Mystify/Mystify/ViewModels/MainWindowViewModel.cs

// Author: Gockner, Simon
// Created: 2021-04-06
// Copyright(c) 2021 SimonG. All Rights Reserved.

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows.Input;
using Avalonia.Controls;
using Lib.Audio.Interfaces;
using Lib.Driver;
using Mystify.Views;
using ReactiveUI;

namespace Mystify.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
        private readonly MainModel? _mainModel;
        private readonly MainWindow? _mainWindow;
        
        public MainWindowViewModel()
        {
            if (!IsInDesignMode)
                throw new InvalidOperationException("Constructor is for design time usage only.");
        }
        
        public MainWindowViewModel(MainModel mainModel, MainWindow? mainWindow)
        {
            _mainModel = mainModel;
            _mainWindow = mainWindow;
        }

        public ObservableCollection<ChannelViewModel>? Channels => _mainModel?.Channels?.Select(c => new ChannelViewModel(c, _mainWindow, _mainModel)).ToObservableCollection();
        public List<IControllable>? Controllables => _mainModel?.Controllables;

        public ChannelViewModel? SelectedChannel
        {
            get => _mainModel?.SelectedChannel == null ? null : new ChannelViewModel(_mainModel.SelectedChannel, _mainWindow, _mainModel);
            set
            {
                if (_mainModel != null) 
                    _mainModel.SelectedChannel = value?.Channel;
            }
        }

        public IControllable? SelectedControllable
        {
            get => _mainModel?.SelectedControllable;
            set
            {
                if (_mainModel != null)
                    _mainModel.SelectedControllable = value;
            }
        }

        public bool UseMidiView
        {
            get => _mainModel is {UseMidiView: true};
            set
            {
                if (_mainModel != null)
                    _mainModel.UseMidiView = value;
            }
        }

        public string SelectedDeviceText => $"Selected Device: {_mainModel?.DeviceName ?? "-"}";

        public ICommand SelectDriverCommand => ReactiveCommand.CreateFromTask(async () =>
        {
            OpenFileDialog openFileDialog = new()
            {
                Filters = new List<FileDialogFilter> {new() {Extensions = new List<string> {DriverLoader.DRIVER_FILE_EXTENSION}, Name = "Mystify Driver"}}
            };
            
            string driverPath = (await openFileDialog.ShowAsync(_mainWindow))[0];

            _mainModel?.LoadDriverAndDevice(driverPath);
            
            RaisePropertyChanged(() => SelectedDeviceText);
            RaisePropertyChanged(() => Channels);
            RaisePropertyChanged(() => Controllables);
        });
        
        public ICommand MapControllableCommand => ReactiveCommand.Create(() => _mainModel?.MapControllable());

        public void UpdateChannelsAndControllables()
        {
            RaisePropertyChanged(() => Channels);
            RaisePropertyChanged(() => Controllables);
        }
    }
}