using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using BililiveRecorder.Core;
using BililiveRecorder.WPF.Controls;
using ModernWpf.Controls;
using NLog;

namespace BililiveRecorder.WPF.Pages
{
    /// <summary>
    /// Interaction logic for RoomList.xaml
    /// </summary>
    public partial class RoomListPage
    {
        private static readonly Logger logger = LogManager.GetCurrentClassLogger();
        private static readonly Regex RoomIdRegex
            = new Regex(@"^(?:https?:\/\/)?live\.bilibili\.com\/(?:blanc\/|h5\/)?(\d*)(?:\?.*)?$",
                RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Compiled);

        private readonly IRecordedRoom[] NullRoom = new IRecordedRoom[] { null };

        private readonly KeyIndexMappingReadOnlyList NullRoomWithMapping;

        public RoomListPage()
        {
            this.NullRoomWithMapping = new KeyIndexMappingReadOnlyList(this.NullRoom);

            this.DataContextChanged += this.RoomListPage_DataContextChanged;

            this.InitializeComponent();
        }

        private void RoomListPage_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (e.OldValue is INotifyCollectionChanged data_old) data_old.CollectionChanged -= this.DataSource_CollectionChanged;
            if (e.NewValue is INotifyCollectionChanged data_new) data_new.CollectionChanged += this.DataSource_CollectionChanged;
            this.ApplySort();
        }

        public static readonly DependencyProperty RoomListProperty =
         DependencyProperty.Register(
             nameof(RoomList),
             typeof(object),
             typeof(RoomListPage),
             new PropertyMetadata(OnPropertyChanged));

        public object RoomList
        {
            get => this.GetValue(RoomListProperty);
            set => this.SetValue(RoomListProperty, value);
        }

        public static readonly DependencyProperty SortByProperty =
              DependencyProperty.Register(
                  nameof(SortBy),
                  typeof(SortedBy),
                  typeof(RoomListPage),
                  new PropertyMetadata(OnPropertyChanged));

        public SortedBy SortBy
        {
            get => (SortedBy)this.GetValue(SortByProperty);
            set
            {
                this.SetValue(SortByProperty, value);
                this.ApplySort();
            }
        }

        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) => ((RoomListPage)d).PrivateOnPropertyChanged(e);

        private void PrivateOnPropertyChanged(DependencyPropertyChangedEventArgs e) { }

        private void DataSource_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) => this.ApplySort();

        private void ApplySort()
        {
            try
            {
                if (this.DataContext is not ICollection<IRecordedRoom> data)
                {
                    this.RoomList = this.NullRoomWithMapping;
                }
                else
                {
                    IEnumerable<IRecordedRoom> orderedData = this.SortBy switch
                    {
                        SortedBy.RoomId => data.OrderBy(x => x.ShortRoomId == 0 ? x.RoomId : x.ShortRoomId),
                        SortedBy.Status => from x in data orderby x.IsRecording descending, x.IsMonitoring descending, x.IsStreaming descending select x,
                        _ => data,
                    };
                    var result = new KeyIndexMappingReadOnlyList(orderedData.Concat(this.NullRoom).ToArray());
                    this.RoomList = result;
                }
            }
            catch (Exception ex)
            {
                logger.Error(ex, "Error Sorting");
            }
        }

        private async void RoomCard_DeleteRequested(object sender, EventArgs e)
        {
            if (this.DataContext is IRecorder rec && sender is IRecordedRoom room)
            {
                var dialog = new DeleteRoomConfirmDialog
                {
                    DataContext = room
                };

                var result = await dialog.ShowAsync();

                if (result == ContentDialogResult.Primary)
                {
                    rec.RemoveRoom(room);
                    rec.SaveConfigToFile();
                }
            }
        }

        private async void RoomCard_ShowSettingsRequested(object sender, EventArgs e)
        {
            try
            {
                await new PerRoomSettingsDialog { DataContext = sender }.ShowAsync();
            }
            catch (Exception) { }
        }

        private async void AddRoomCard_AddRoomRequested(object sender, string e)
        {
            var input = e.Trim();
            if (string.IsNullOrWhiteSpace(input) || this.DataContext is not IRecorder rec) return;

            if (!int.TryParse(input, out var roomid))
            {
                var m = RoomIdRegex.Match(input);
                if (m.Success && m.Groups.Count > 1 && int.TryParse(m.Groups[1].Value, out var result2))
                {
                    roomid = result2;
                }
                else
                {
                    await new AddRoomFailedDialog { DataContext = AddRoomFailedDialog.AddRoomFailedErrorText.InvalidInput }.ShowAsync();
                    return;
                }
            }

            if (roomid < 0)
            {
                await new AddRoomFailedDialog { DataContext = AddRoomFailedDialog.AddRoomFailedErrorText.RoomIdNegative }.ShowAsync();
                return;
            }
            else if (roomid == 0)
            {
                await new AddRoomFailedDialog { DataContext = AddRoomFailedDialog.AddRoomFailedErrorText.RoomIdZero }.ShowAsync();
                return;
            }

            if (rec.Any(x => x.RoomId == roomid || x.ShortRoomId == roomid))
            {
                await new AddRoomFailedDialog { DataContext = AddRoomFailedDialog.AddRoomFailedErrorText.Duplicate }.ShowAsync();
                return;
            }

            rec.AddRoom(roomid);
            rec.SaveConfigToFile();
        }

        private async void MenuItem_EnableAutoRecAll_Click(object sender, RoutedEventArgs e)
        {
            if (this.DataContext is not IRecorder rec) return;

            await Task.WhenAll(rec.ToList().Select(rr => Task.Run(() => rr.Start())));
            rec.SaveConfigToFile();
        }

        private async void MenuItem_DisableAutoRecAll_Click(object sender, RoutedEventArgs e)
        {
            if (this.DataContext is not IRecorder rec) return;

            await Task.WhenAll(rec.ToList().Select(rr => Task.Run(() => rr.Stop())));
            rec.SaveConfigToFile();
        }

        private void MenuItem_SortBy_Click(object sender, RoutedEventArgs e) => this.SortBy = (SortedBy)((MenuItem)sender).Tag;

        private void MenuItem_ShowLog_Click(object sender, RoutedEventArgs e)
        {
            this.Splitter.Visibility = Visibility.Visible;
            this.LogElement.Visibility = Visibility.Visible;
            this.RoomListRowDefinition.Height = new GridLength(1, GridUnitType.Star);
            this.LogRowDefinition.Height = new GridLength(1, GridUnitType.Star);
        }

        private void MenuItem_HideLog_Click(object sender, RoutedEventArgs e)
        {
            this.Splitter.Visibility = Visibility.Collapsed;
            this.LogElement.Visibility = Visibility.Collapsed;
            this.RoomListRowDefinition.Height = new GridLength(1, GridUnitType.Star);
            this.LogRowDefinition.Height = new GridLength(0);
        }

        private void Log_ScrollViewer_Loaded(object sender, RoutedEventArgs e) => (sender as ScrollViewer)?.ScrollToEnd();

        private void TextBlock_Copy_MouseRightButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            try
            {
                if (sender is TextBlock textBlock)
                {
                    Clipboard.SetText(textBlock.Text);
                }
            }
            catch (Exception)
            {
            }
        }

        private void MenuItem_OpenWorkDirectory_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                if (this.DataContext is IRecorder rec)
                    Process.Start("explorer.exe", rec.Config.Global.WorkDirectory);
            }
            catch (Exception)
            {
            }
        }

        private void MenuItem_ShowHideTitleArea_Click(object sender, RoutedEventArgs e)
        {
            if (((MenuItem)sender).Tag is bool b && this.DataContext is IRecorder rec)
                rec.Config.Global.WpfShowTitleAndArea = b;
        }
    }

    public enum SortedBy
    {
        None = 0,
        RoomId,
        Status,
    }

    internal class KeyIndexMappingReadOnlyList : IReadOnlyList<IRecordedRoom>, IKeyIndexMapping
    {
        private readonly IReadOnlyList<IRecordedRoom> data;

        public KeyIndexMappingReadOnlyList(IReadOnlyList<IRecordedRoom> data)
        {
            this.data = data;
        }

        public IRecordedRoom this[int index] => this.data[index];

        public int Count => this.data.Count;

        public IEnumerator<IRecordedRoom> GetEnumerator() => this.data.GetEnumerator();
        IEnumerator IEnumerable.GetEnumerator() => ((IEnumerable)this.data).GetEnumerator();

        #region IKeyIndexMapping

        private int lastRequestedIndex = IndexNotFound;
        private const int IndexNotFound = -1;

        // When UniqueIDs are supported, the ItemsRepeater caches the unique ID for each item
        // with the matching UIElement that represents the item.  When a reset occurs the
        // ItemsRepeater pairs up the already generated UIElements with items in the data
        // source.
        // ItemsRepeater uses IndexForUniqueId after a reset to probe the data and identify
        // the new index of an item to use as the anchor.  If that item no
        // longer exists in the data source it may try using another cached unique ID until
        // either a match is found or it determines that all the previously visible items
        // no longer exist.
        public int IndexFromKey(string uniqueId)
        {
            // We'll try to increase our odds of finding a match sooner by starting from the
            // position that we know was last requested and search forward.
            var start = this.lastRequestedIndex;
            for (var i = start; i < this.Count; i++)
            {
                if ((this[i]?.Guid ?? Guid.Empty).Equals(uniqueId))
                    return i;
            }

            // Then try searching backward.
            start = Math.Min(this.Count - 1, this.lastRequestedIndex);
            for (var i = start; i >= 0; i--)
            {
                if ((this[i]?.Guid ?? Guid.Empty).Equals(uniqueId))
                    return i;
            }

            return IndexNotFound;
        }

        public string KeyFromIndex(int index)
        {
            var key = this[index]?.Guid ?? Guid.Empty;
            this.lastRequestedIndex = index;
            return key.ToString();
        }

        #endregion
    }
}