using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Input;
using file_finder__test;

namespace YourNamespace
{
    public class ScanSettingsViewModel : INotifyPropertyChanged
    {
        private int _option;               // 0 = all drives, 1 = specific, 2 = direct path
        private int _specificOption;       // index of selected directory for specific option
        private string _rootPath;          // path for direct path
        private string _selectedOption;    // content of selected RadioButton

        public List<string> Dirs { get; set; } = new List<string>();

        public int Option
        {
            get => _option;
            private set
            {
                if (_option != value)
                {
                    _option = value;
                    OnPropertyChanged();
                }
            }
        }

        public int SpecificOption
        {
            get => _specificOption;
            private set
            {
                if (_specificOption != value)
                {
                    _specificOption = value;
                    OnPropertyChanged();
                }
            }
        }

        public string RootPath
        {
            get => _rootPath;
            set
            {
                if (_rootPath != value)
                {
                    _rootPath = value;
                    OnPropertyChanged();
                    // Notify owner when root path changes
                    StateChanged?.Invoke(this, EventArgs.Empty);
                }
            }
        }

        public string SelectedOption
        {
            get => _selectedOption;
            set
            {
                if (_selectedOption != value)
                {
                    _selectedOption = value;
                    OnPropertyChanged();
                    UpdateOptionState();
                }
            }
        }

        // Event to notify the owner MainWindow
        public event EventHandler StateChanged;

        
        public ScanSettingsViewModel()
        {
            Option = 2;          
            RootPath = "M:/Media";

            SelectPathCommand = new RelayCommand(o => { });
            _ = InitializeAsync();
        }
        
        private async Task InitializeAsync()
        {
            
            FileScanner fileScanner= new FileScanner();
            var drives = await fileScanner.ScanAllDrivesAsync();
            foreach (var drive in drives)
            {
                Dirs.Add(drive);
            }
        }



        public ICommand SelectPathCommand { get; set; }

        private void UpdateOptionState()
        {
            if (SelectedOption == "scan all drives")
            {
                Option = 0;
            }
            else if (SelectedOption == "direct path")
            {
                Option = 2;
                // RootPath already bound to textbox
            }
            else
            {
                // Must be one of the dynamic dirs
                Option = 1;
                SpecificOption = Dirs.IndexOf(SelectedOption);
                
            }

            // Notify owner
            StateChanged?.Invoke(this, EventArgs.Empty);
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged([CallerMemberName] string name = null)
            => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }

    public class RelayCommand : ICommand
    {
        private readonly Action<object> _execute;
        private readonly Predicate<object> _canExecute;

        public RelayCommand(Action<object> execute, Predicate<object> canExecute = null)
        {
            _execute = execute;
            _canExecute = canExecute;
        }

        public bool CanExecute(object parameter) => _canExecute == null || _canExecute(parameter);
        public void Execute(object parameter) => _execute(parameter);
        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
    }
}