// 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.Linq;
using osu.Framework.Allocation;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Graphics;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.Judgements;
using osu.Game.Rulesets.UI;
using osu.Game.Rulesets.UI.Scrolling;
using osu.Game.Rulesets.Taiko.Objects;
using osu.Game.Rulesets.Taiko.Objects.Drawables;
using osu.Game.Rulesets.Taiko.Judgements;
using OpenTK;
using OpenTK.Graphics;

namespace osu.Game.Rulesets.Taiko.UI
{
    public class TaikoPlayfield : ScrollingPlayfield
    {
        /// <summary>
        /// Default height of a <see cref="TaikoPlayfield"/> when inside a <see cref="TaikoRulesetContainer"/>.
        /// </summary>
        public const float DEFAULT_HEIGHT = 178;

        /// <summary>
        /// The offset from <see cref="left_area_size"/> which the center of the hit target lies at.
        /// </summary>
        public const float HIT_TARGET_OFFSET = 100;

        /// <summary>
        /// The size of the left area of the playfield. This area contains the input drum.
        /// </summary>
        private const float left_area_size = 240;

        private readonly Container<HitExplosion> hitExplosionContainer;
        private readonly Container<KiaiHitExplosion> kiaiExplosionContainer;
        private readonly JudgementContainer<DrawableTaikoJudgement> judgementContainer;
        internal readonly HitTarget HitTarget;

        private readonly Container topLevelHitContainer;

        private readonly Container barlineContainer;

        private readonly Container overlayBackgroundContainer;
        private readonly Container backgroundContainer;

        private readonly Box overlayBackground;
        private readonly Box background;

        public TaikoPlayfield(ControlPointInfo controlPoints)
        {
            InternalChild = new PlayfieldAdjustmentContainer
            {
                Anchor = Anchor.CentreLeft,
                Origin = Anchor.CentreLeft,
                RelativeSizeAxes = Axes.Both,
                Children = new Drawable[]
                {
                    backgroundContainer = new Container
                    {
                        Name = "Transparent playfield background",
                        RelativeSizeAxes = Axes.Both,
                        Masking = true,
                        EdgeEffect = new EdgeEffectParameters
                        {
                            Type = EdgeEffectType.Shadow,
                            Colour = Color4.Black.Opacity(0.2f),
                            Radius = 5,
                        },
                        Children = new Drawable[]
                        {
                            background = new Box
                            {
                                RelativeSizeAxes = Axes.Both,
                                Alpha = 0.6f
                            },
                        }
                    },
                    new Container
                    {
                        Name = "Right area",
                        RelativeSizeAxes = Axes.Both,
                        Padding = new MarginPadding { Left = left_area_size },
                        Children = new Drawable[]
                        {
                            new Container
                            {
                                Name = "Masked elements before hit objects",
                                RelativeSizeAxes = Axes.Both,
                                Padding = new MarginPadding { Left = HIT_TARGET_OFFSET },
                                Masking = true,
                                Children = new Drawable[]
                                {
                                    hitExplosionContainer = new Container<HitExplosion>
                                    {
                                        RelativeSizeAxes = Axes.Both,
                                        FillMode = FillMode.Fit,
                                        Blending = BlendingMode.Additive,
                                    },
                                    HitTarget = new HitTarget
                                    {
                                        Anchor = Anchor.CentreLeft,
                                        Origin = Anchor.Centre,
                                        RelativeSizeAxes = Axes.Both,
                                        FillMode = FillMode.Fit
                                    }
                                }
                            },
                            barlineContainer = new Container
                            {
                                RelativeSizeAxes = Axes.Both,
                                Padding = new MarginPadding { Left = HIT_TARGET_OFFSET }
                            },
                            new Container
                            {
                                Name = "Hit objects",
                                RelativeSizeAxes = Axes.Both,
                                Padding = new MarginPadding { Left = HIT_TARGET_OFFSET },
                                Masking = true,
                                Child = HitObjectContainer
                            },
                            kiaiExplosionContainer = new Container<KiaiHitExplosion>
                            {
                                Name = "Kiai hit explosions",
                                RelativeSizeAxes = Axes.Both,
                                FillMode = FillMode.Fit,
                                Margin = new MarginPadding { Left = HIT_TARGET_OFFSET },
                                Blending = BlendingMode.Additive
                            },
                            judgementContainer = new JudgementContainer<DrawableTaikoJudgement>
                            {
                                Name = "Judgements",
                                RelativeSizeAxes = Axes.Y,
                                Margin = new MarginPadding { Left = HIT_TARGET_OFFSET },
                                Blending = BlendingMode.Additive
                            },
                        }
                    },
                    overlayBackgroundContainer = new Container
                    {
                        Name = "Left overlay",
                        RelativeSizeAxes = Axes.Y,
                        Size = new Vector2(left_area_size, 1),
                        Children = new Drawable[]
                        {
                            overlayBackground = new Box
                            {
                                RelativeSizeAxes = Axes.Both,
                            },
                            new InputDrum(controlPoints)
                            {
                                Anchor = Anchor.CentreRight,
                                Origin = Anchor.CentreRight,
                                Scale = new Vector2(0.9f),
                                Margin = new MarginPadding { Right = 20 }
                            },
                            new Box
                            {
                                Anchor = Anchor.TopRight,
                                RelativeSizeAxes = Axes.Y,
                                Width = 10,
                                Colour = Framework.Graphics.Colour.ColourInfo.GradientHorizontal(Color4.Black.Opacity(0.6f), Color4.Black.Opacity(0)),
                            },
                        }
                    },
                    new Container
                    {
                        Name = "Border",
                        RelativeSizeAxes = Axes.Both,
                        Masking = true,
                        MaskingSmoothness = 0,
                        BorderThickness = 2,
                        AlwaysPresent = true,
                        Children = new[]
                        {
                            new Box
                            {
                                RelativeSizeAxes = Axes.Both,
                                Alpha = 0,
                                AlwaysPresent = true
                            }
                        }
                    },
                    topLevelHitContainer = new Container
                    {
                        Name = "Top level hit objects",
                        RelativeSizeAxes = Axes.Both,
                    }
                }
            };
        }

        [BackgroundDependencyLoader]
        private void load(OsuColour colours)
        {
            overlayBackgroundContainer.BorderColour = colours.Gray0;
            overlayBackground.Colour = colours.Gray1;

            backgroundContainer.BorderColour = colours.Gray1;
            background.Colour = colours.Gray0;
        }

        public override void Add(DrawableHitObject h)
        {
            h.OnNewResult += OnNewResult;

            base.Add(h);

            switch (h)
            {
                case DrawableBarLine barline:
                    barlineContainer.Add(barline.CreateProxy());
                    break;
                case DrawableTaikoHitObject taikoObject:
                    topLevelHitContainer.Add(taikoObject.CreateProxiedContent());
                    break;
            }
        }

        internal void OnNewResult(DrawableHitObject judgedObject, JudgementResult result)
        {
            if (!DisplayJudgements)
                return;

            if (!judgedObject.DisplayResult)
                return;

            switch (result.Judgement)
            {
                case TaikoStrongJudgement _:
                    if (result.IsHit)
                        hitExplosionContainer.Children.FirstOrDefault(e => e.JudgedObject == ((DrawableStrongNestedHit)judgedObject).MainObject)?.VisualiseSecondHit();
                    break;
                default:
                    judgementContainer.Add(new DrawableTaikoJudgement(result, judgedObject)
                    {
                        Anchor = result.IsHit ? Anchor.TopLeft : Anchor.CentreLeft,
                        Origin = result.IsHit ? Anchor.BottomCentre : Anchor.Centre,
                        RelativePositionAxes = Axes.X,
                        X = result.IsHit ? judgedObject.Position.X : 0,
                    });

                    if (!result.IsHit)
                        break;

                    bool isRim = judgedObject.HitObject is RimHit;

                    hitExplosionContainer.Add(new HitExplosion(judgedObject, isRim));

                    if (judgedObject.HitObject.Kiai)
                        kiaiExplosionContainer.Add(new KiaiHitExplosion(judgedObject, isRim));

                    break;
            }
        }
    }
}