// 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;
using System.Diagnostics;
using System.Linq;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Pooling;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Localisation;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.Drawables;
using osu.Game.Graphics;
using osu.Game.Graphics.Sprites;
using osu.Game.Overlays;
using osuTK;

namespace osu.Game.Screens.SelectV2
{
    public partial class BeatmapSetPanel : PoolableDrawable, ICarouselPanel
    {
        public const float HEIGHT = CarouselItem.DEFAULT_HEIGHT * 1.6f;

        // todo: this should be replaced with information from CarouselItem about how deep is BeatmapPanel in the carousel
        // (i.e. whether it's under a beatmap set that's under a group, or just under a top-level beatmap set).
        private const float set_x_offset = 20f; // constant X offset for beatmap set/standalone panels specifically.

        private const float duration = 500;

        private CarouselPanelPiece panel = null!;
        private BeatmapSetPanelBackground background = null!;

        private OsuSpriteText titleText = null!;
        private OsuSpriteText artistText = null!;
        private Drawable chevronIcon = null!;
        private UpdateBeatmapSetButtonV2 updateButton = null!;
        private BeatmapSetOnlineStatusPill statusPill = null!;
        private DifficultySpectrumDisplay difficultiesDisplay = null!;

        [Resolved]
        private BeatmapCarousel? carousel { get; set; }

        [Resolved]
        private OverlayColourProvider colourProvider { get; set; } = null!;

        [Resolved]
        private BeatmapManager beatmaps { get; set; } = null!;

        [BackgroundDependencyLoader]
        private void load()
        {
            Anchor = Anchor.TopRight;
            Origin = Anchor.TopRight;
            RelativeSizeAxes = Axes.X;
            Height = HEIGHT;

            InternalChild = panel = new CarouselPanelPiece(set_x_offset)
            {
                Action = onAction,
                Icon = chevronIcon = new Container
                {
                    Size = new Vector2(22),
                    Child = new SpriteIcon
                    {
                        Anchor = Anchor.Centre,
                        Origin = Anchor.Centre,
                        Icon = FontAwesome.Solid.ChevronRight,
                        Size = new Vector2(12),
                        X = 1f,
                        Colour = colourProvider.Background5,
                    },
                },
                Background = background = new BeatmapSetPanelBackground
                {
                    RelativeSizeAxes = Axes.Both,
                },
                Child = new FillFlowContainer
                {
                    AutoSizeAxes = Axes.Both,
                    Direction = FillDirection.Vertical,
                    Padding = new MarginPadding { Top = 7.5f, Left = 15, Bottom = 5 },
                    Children = new Drawable[]
                    {
                        titleText = new OsuSpriteText
                        {
                            Font = OsuFont.GetFont(weight: FontWeight.Bold, size: 22, italics: true),
                        },
                        artistText = new OsuSpriteText
                        {
                            Font = OsuFont.GetFont(weight: FontWeight.SemiBold, size: 17, italics: true),
                        },
                        new FillFlowContainer
                        {
                            Direction = FillDirection.Horizontal,
                            AutoSizeAxes = Axes.Both,
                            Margin = new MarginPadding { Top = 5f },
                            Children = new Drawable[]
                            {
                                updateButton = new UpdateBeatmapSetButtonV2
                                {
                                    Anchor = Anchor.CentreLeft,
                                    Origin = Anchor.CentreLeft,
                                    Margin = new MarginPadding { Right = 5f, Top = -2f },
                                },
                                statusPill = new BeatmapSetOnlineStatusPill
                                {
                                    AutoSizeAxes = Axes.Both,
                                    Origin = Anchor.CentreLeft,
                                    Anchor = Anchor.CentreLeft,
                                    TextSize = 11,
                                    TextPadding = new MarginPadding { Horizontal = 8, Vertical = 2 },
                                    Margin = new MarginPadding { Right = 5f },
                                },
                                difficultiesDisplay = new DifficultySpectrumDisplay
                                {
                                    DotSize = new Vector2(5, 10),
                                    DotSpacing = 2,
                                    Anchor = Anchor.CentreLeft,
                                    Origin = Anchor.CentreLeft,
                                },
                            },
                        }
                    }
                }
            };
        }

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

            Expanded.BindValueChanged(_ => onExpanded(), true);
            KeyboardSelected.BindValueChanged(k => panel.KeyboardActive.Value = k.NewValue, true);
        }

        private void onExpanded()
        {
            panel.Active.Value = Expanded.Value;
            chevronIcon.ResizeWidthTo(Expanded.Value ? 22 : 0f, duration, Easing.OutQuint);
            chevronIcon.FadeTo(Expanded.Value ? 1f : 0f, duration, Easing.OutQuint);
        }

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

            Debug.Assert(Item != null);

            var beatmapSet = (BeatmapSetInfo)Item.Model;

            // Choice of background image matches BSS implementation (always uses the lowest `beatmap_id` from the set).
            background.Beatmap = beatmaps.GetWorkingBeatmap(beatmapSet.Beatmaps.MinBy(b => b.OnlineID));

            titleText.Text = new RomanisableString(beatmapSet.Metadata.TitleUnicode, beatmapSet.Metadata.Title);
            artistText.Text = new RomanisableString(beatmapSet.Metadata.ArtistUnicode, beatmapSet.Metadata.Artist);
            updateButton.BeatmapSet = beatmapSet;
            statusPill.Status = beatmapSet.Status;
            difficultiesDisplay.BeatmapSet = beatmapSet;

            FinishTransforms(true);
            this.FadeInFromZero(duration, Easing.OutQuint);
        }

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

            background.Beatmap = null;
            updateButton.BeatmapSet = null;
            difficultiesDisplay.BeatmapSet = null;
        }

        private void onAction()
        {
            if (carousel != null)
                carousel.CurrentSelection = Item!.Model;
        }

        #region ICarouselPanel

        public CarouselItem? Item { get; set; }
        public BindableBool Selected { get; } = new BindableBool();
        public BindableBool Expanded { get; } = new BindableBool();
        public BindableBool KeyboardSelected { get; } = new BindableBool();

        public double DrawYPosition { get; set; }

        public void Activated()
        {
            // sets should never be activated.
            throw new InvalidOperationException();
        }

        #endregion
    }
}