// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System.Diagnostics;
using System.Linq;
using JetBrains.Annotations;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Logging;
using osu.Framework.Screens;
using osu.Game.Input;
using osu.Game.Online.Rooms;
using osu.Game.Screens.OnlinePlay.Components;
using osu.Game.Screens.OnlinePlay.Match;
using osu.Game.Screens.OnlinePlay.Match.Components;
using osu.Game.Screens.Play;
using osu.Game.Screens.Play.HUD;
using osu.Game.Users;
using osuTK;

namespace osu.Game.Screens.OnlinePlay.Playlists
{
    public class PlaylistsRoomSubScreen : RoomSubScreen
    {
        public override string Title { get; }

        public override string ShortTitle => "playlist";

        private readonly IBindable<bool> isIdle = new BindableBool();

        private MatchLeaderboard leaderboard;
        private SelectionPollingComponent selectionPollingComponent;

        private FillFlowContainer progressSection;

        public PlaylistsRoomSubScreen(Room room)
            : base(room, false) // Editing is temporarily not allowed.
        {
            Title = room.RoomID.Value == null ? "New playlist" : room.Name.Value;
            Activity.Value = new UserActivity.InLobby(room);
        }

        [BackgroundDependencyLoader(true)]
        private void load([CanBeNull] IdleTracker idleTracker)
        {
            if (idleTracker != null)
                isIdle.BindTo(idleTracker.IsIdle);

            AddInternal(selectionPollingComponent = new SelectionPollingComponent(Room));
        }

        protected override void LoadComplete()
        {
            base.LoadComplete();

            isIdle.BindValueChanged(_ => updatePollingRate(), true);
            RoomId.BindValueChanged(id =>
            {
                if (id.NewValue != null)
                {
                    // Set the first playlist item.
                    // This is scheduled since updating the room and playlist may happen in an arbitrary order (via Room.CopyFrom()).
                    Schedule(() => SelectedItem.Value = Room.Playlist.FirstOrDefault());
                }
            }, true);

            Room.MaxAttempts.BindValueChanged(attempts => progressSection.Alpha = Room.MaxAttempts.Value != null ? 1 : 0, true);
        }

        protected override Drawable CreateMainContent() => new GridContainer
        {
            RelativeSizeAxes = Axes.Both,
            Content = new[]
            {
                new Drawable[]
                {
                    new Container
                    {
                        RelativeSizeAxes = Axes.Both,
                        Padding = new MarginPadding { Right = 5 },
                        Child = new GridContainer
                        {
                            RelativeSizeAxes = Axes.Both,
                            Content = new[]
                            {
                                new Drawable[] { new OverlinedPlaylistHeader(), },
                                new Drawable[]
                                {
                                    new DrawableRoomPlaylist
                                    {
                                        RelativeSizeAxes = Axes.Both,
                                        Items = { BindTarget = Room.Playlist },
                                        SelectedItem = { BindTarget = SelectedItem },
                                        AllowSelection = true,
                                        AllowShowingResults = true,
                                        RequestResults = item =>
                                        {
                                            Debug.Assert(RoomId.Value != null);
                                            ParentScreen?.Push(new PlaylistsResultsScreen(null, RoomId.Value.Value, item, false));
                                        }
                                    }
                                },
                            },
                            RowDimensions = new[]
                            {
                                new Dimension(GridSizeMode.AutoSize),
                                new Dimension(),
                            }
                        }
                    },
                    null,
                    new GridContainer
                    {
                        RelativeSizeAxes = Axes.Both,
                        Content = new[]
                        {
                            new[]
                            {
                                UserModsSection = new FillFlowContainer
                                {
                                    RelativeSizeAxes = Axes.X,
                                    AutoSizeAxes = Axes.Y,
                                    Alpha = 0,
                                    Margin = new MarginPadding { Bottom = 10 },
                                    Children = new Drawable[]
                                    {
                                        new OverlinedHeader("Extra mods"),
                                        new FillFlowContainer
                                        {
                                            AutoSizeAxes = Axes.Both,
                                            Direction = FillDirection.Horizontal,
                                            Spacing = new Vector2(10, 0),
                                            Children = new Drawable[]
                                            {
                                                new UserModSelectButton
                                                {
                                                    Anchor = Anchor.CentreLeft,
                                                    Origin = Anchor.CentreLeft,
                                                    Width = 90,
                                                    Text = "Select",
                                                    Action = ShowUserModSelect,
                                                },
                                                new ModDisplay
                                                {
                                                    Anchor = Anchor.CentreLeft,
                                                    Origin = Anchor.CentreLeft,
                                                    Current = UserMods,
                                                    Scale = new Vector2(0.8f),
                                                },
                                            }
                                        }
                                    }
                                },
                            },
                            new Drawable[]
                            {
                                progressSection = new FillFlowContainer
                                {
                                    RelativeSizeAxes = Axes.X,
                                    AutoSizeAxes = Axes.Y,
                                    Alpha = 0,
                                    Margin = new MarginPadding { Bottom = 10 },
                                    Direction = FillDirection.Vertical,
                                    Children = new Drawable[]
                                    {
                                        new OverlinedHeader("Progress"),
                                        new RoomLocalUserInfo(),
                                    }
                                },
                            },
                            new Drawable[]
                            {
                                new OverlinedHeader("Leaderboard")
                            },
                            new Drawable[] { leaderboard = new MatchLeaderboard { RelativeSizeAxes = Axes.Both }, },
                            new Drawable[] { new OverlinedHeader("Chat"), },
                            new Drawable[] { new MatchChatDisplay(Room) { RelativeSizeAxes = Axes.Both } }
                        },
                        RowDimensions = new[]
                        {
                            new Dimension(GridSizeMode.AutoSize),
                            new Dimension(GridSizeMode.AutoSize),
                            new Dimension(GridSizeMode.AutoSize),
                            new Dimension(),
                            new Dimension(GridSizeMode.AutoSize),
                            new Dimension(GridSizeMode.Relative, size: 0.4f, minSize: 120),
                        }
                    },
                },
            },
            ColumnDimensions = new[]
            {
                new Dimension(GridSizeMode.Relative, size: 0.5f, maxSize: 400),
                new Dimension(),
                new Dimension(GridSizeMode.Relative, size: 0.5f, maxSize: 600),
            }
        };

        protected override Drawable CreateFooter() => new PlaylistsRoomFooter
        {
            OnStart = StartPlay
        };

        protected override RoomSettingsOverlay CreateRoomSettingsOverlay(Room room) => new PlaylistsRoomSettingsOverlay(room)
        {
            EditPlaylist = () =>
            {
                if (this.IsCurrentScreen())
                    this.Push(new PlaylistsSongSelect(Room));
            },
        };

        private void updatePollingRate()
        {
            selectionPollingComponent.TimeBetweenPolls.Value = isIdle.Value ? 30000 : 5000;
            Logger.Log($"Polling adjusted (selection: {selectionPollingComponent.TimeBetweenPolls.Value})");
        }

        protected override Screen CreateGameplayScreen() => new PlayerLoader(() => new PlaylistsPlayer(Room, SelectedItem.Value)
        {
            Exited = () => leaderboard.RefetchScores()
        });
    }
}