// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Input.Events;
using osu.Framework.Screens;
using osu.Game.Online.Multiplayer;
using osu.Game.Overlays.SearchableList;
using osu.Game.Screens.Multi.Lounge.Components;
using osu.Game.Screens.Multi.Match;

namespace osu.Game.Screens.Multi.Lounge
{
    public class LoungeScreen : MultiplayerScreen
    {
        protected readonly FilterControl Filter;

        private readonly Container content;
        private readonly SearchContainer search;
        private readonly RoomsContainer rooms;
        private readonly Action<Screen> pushGameplayScreen;

        [Cached]
        private readonly RoomManager manager;

        public override string Title => "Lounge";

        protected override Drawable TransitionContent => content;

        public LoungeScreen(Action<Screen> pushGameplayScreen)
        {
            this.pushGameplayScreen = pushGameplayScreen;

            RoomInspector inspector;

            Children = new Drawable[]
            {
                Filter = new FilterControl { Depth = -1 },
                content = new Container
                {
                    RelativeSizeAxes = Axes.Both,
                    Children = new Drawable[]
                    {
                        new ScrollContainer
                        {
                            RelativeSizeAxes = Axes.Both,
                            Width = 0.55f,
                            Padding = new MarginPadding
                            {
                                Vertical = 35 - DrawableRoom.SELECTION_BORDER_WIDTH,
                                Right = 20 - DrawableRoom.SELECTION_BORDER_WIDTH
                            },
                            Child = search = new SearchContainer
                            {
                                RelativeSizeAxes = Axes.X,
                                AutoSizeAxes = Axes.Y,
                                Child = rooms = new RoomsContainer { OpenRequested = openRoom }
                            },
                        },
                        inspector = new RoomInspector
                        {
                            Anchor = Anchor.TopRight,
                            Origin = Anchor.TopRight,
                            RelativeSizeAxes = Axes.Both,
                            Width = 0.45f,
                        },
                    },
                },
                manager = new RoomManager()
            };

            inspector.Room.BindTo(manager.Current);

            Filter.Search.Current.ValueChanged += s => filterRooms();
            Filter.Tabs.Current.ValueChanged += t => filterRooms();
            Filter.Search.Exit += Exit;
        }

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

            content.Padding = new MarginPadding
            {
                Top = Filter.DrawHeight,
                Left = SearchableListOverlay.WIDTH_PADDING - DrawableRoom.SELECTION_BORDER_WIDTH,
                Right = SearchableListOverlay.WIDTH_PADDING,
            };
        }

        protected override void OnFocus(FocusEvent e)
        {
            GetContainingInputManager().ChangeFocus(Filter.Search);
        }

        protected override void OnEntering(Screen last)
        {
            base.OnEntering(last);
            Filter.Search.HoldFocus = true;
        }

        protected override bool OnExiting(Screen next)
        {
            Filter.Search.HoldFocus = false;
            return base.OnExiting(next);
        }

        protected override void OnResuming(Screen last)
        {
            base.OnResuming(last);

            Filter.Search.HoldFocus = true;
        }

        protected override void OnSuspending(Screen next)
        {
            base.OnSuspending(next);
            Filter.Search.HoldFocus = false;
        }

        private void filterRooms()
        {
            if (Filter.Tabs.Current.Value == LoungeTab.Create)
            {
                Filter.Tabs.Current.Value = LoungeTab.Public;
                openRoom(new Room());
            }

            search.SearchTerm = Filter.Search.Current.Value ?? string.Empty;

            rooms.Filter(Filter.CreateCriteria());
        }

        private void openRoom(Room room)
        {
            // Handles the case where a room is clicked 3 times in quick succession
            if (!IsCurrentScreen)
                return;

            Push(new MatchScreen(room, s  => pushGameplayScreen?.Invoke(s)));
        }
    }
}