using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace HashCalculator.GUI
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {

        public MainWindow()
        {
            InitializeComponent();
            DataContext = new ViewModel();
        }
    }

    internal sealed class ViewModel : INotifyPropertyChanged
    {
        #region INotifyPropertyChanged
        public event PropertyChangedEventHandler? PropertyChanged;

        private void SetField<X>(ref X field, X value, [CallerMemberName] string? propertyName = null)
        {
            if (propertyName == null)
            {
                throw new InvalidOperationException();
            }

            if (EqualityComparer<X>.Default.Equals(field, value))
            {
                return;
            }

            field = value;

            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        #endregion

        public IReadOnlyList<Person> Items
        {
            get { return PersonModule.All; }
        }

        Person selectedItem;
        public Person SelectedItem
        {
            get { return selectedItem; }
            set { SetField(ref selectedItem, value); }
        }

        long? selectedValue;
        public long? SelectedValue
        {
            get { return selectedValue; }
            set { SetField(ref selectedValue, value); }
        }
    }

    internal enum InputEntryType
    {
        Text,
        SupportedFilePath,
        BinaryFilePath,
        Path,
    }

    internal sealed class InputEntry
    {
        public InputEntryType Type { get; }
        public string Value { get; }

        public InputEntry(InputEntryType type, string value)
        {
            Type = type;
            Value = value;
        }

        public static List<InputEntry> CreateSuggestion(string value)
        {
            var list = new List<InputEntry>();
            try
            {
                var path = new FileInfo(value);
                path.Directory.GetFiles()
            }
            catch { }
            
        }

        public static bool IsSupportedFile(string value)
        {

        }

        public static IEnumerable<InputEntry> ProvideFileSystemSuggestions(string path)
        {
            var empty = Enumerable.Empty<InputEntry>();
            var list = empty;

            if (string.IsNullOrWhiteSpace(path))
            {
                return list;
            }

            var directories = empty;
            try
            {
                var directoryInfo = new DirectoryInfo(path);
                if (directoryInfo.Exists)
                {
                    directories = directoryInfo.GetDirectories()
                        .Select(info => new InputEntry(InputEntryType.Path, info.FullName));
                }
            }
            catch { }

            var files = empty;
            try
            {
                var fileInfo = new FileInfo(path);
                if (fileInfo.Exists)
                {
                    files = files.Concat()
                }
                if (fileInfo.Directory.Exists)
                {
                    
                }

                //fileInfo.Directory.get
            }
            catch { }
        }
    }
}