// 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 osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.Objects.Drawables;
using osu.Game.Rulesets.Judgements;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.UI.Scrolling;
using osuTK;

namespace osu.Game.Rulesets.Catch.UI
{
    public class CatchPlayfield : ScrollingPlayfield
    {
        /// <summary>
        /// The width of the playfield.
        /// The horizontal movement of the catcher is confined in the area of this width.
        /// </summary>
        public const float WIDTH = 512;

        /// <summary>
        /// The center position of the playfield.
        /// </summary>
        public const float CENTER_X = WIDTH / 2;

        internal readonly CatcherArea CatcherArea;
        private readonly CatchComboDisplay comboDisplay;

        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
            // only check the X position; handle all vertical space.
            base.ReceivePositionalInputAt(new Vector2(screenSpacePos.X, ScreenSpaceDrawQuad.Centre.Y));

        public CatchPlayfield(BeatmapDifficulty difficulty, Func<CatchHitObject, DrawableHitObject<CatchHitObject>> createDrawableRepresentation)
        {
            var explodingFruitContainer = new Container
            {
                RelativeSizeAxes = Axes.Both,
            };

            CatcherArea = new CatcherArea(difficulty)
            {
                CreateDrawableRepresentation = createDrawableRepresentation,
                ExplodingFruitTarget = explodingFruitContainer,
                Anchor = Anchor.BottomLeft,
                Origin = Anchor.TopLeft,
            };

            comboDisplay = new CatchComboDisplay
            {
                RelativeSizeAxes = Axes.None,
                AutoSizeAxes = Axes.Both,
                Anchor = Anchor.CentreLeft,
                Origin = Anchor.Centre,
                Y = 30f,
            };

            InternalChildren = new[]
            {
                explodingFruitContainer,
                CatcherArea.MovableCatcher.CreateProxiedContent(),
                HitObjectContainer,
                CatcherArea,
                comboDisplay,
            };
        }

        public bool CheckIfWeCanCatch(CatchHitObject obj) => CatcherArea.AttemptCatch(obj);

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

            base.Add(h);

            var fruit = (DrawableCatchHitObject)h;
            fruit.CheckPosition = CheckIfWeCanCatch;
        }

        protected override void Update()
        {
            base.Update();
            comboDisplay.X = CatcherArea.MovableCatcher.X;
        }

        private void onNewResult(DrawableHitObject judgedObject, JudgementResult result)
        {
            var catchObject = (DrawableCatchHitObject)judgedObject;
            CatcherArea.OnResult(catchObject, result);

            comboDisplay.OnNewResult(catchObject, result);
        }

        private void onRevertResult(DrawableHitObject judgedObject, JudgementResult result)
        {
            comboDisplay.OnRevertResult((DrawableCatchHitObject)judgedObject, result);
        }
    }
}