osu-lazer/osu.Game.Rulesets.Catch/Skinning/Legacy/CatchLegacySkinTransformer.cs

// 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.Linq;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Game.Screens.Play.HUD;
using osu.Game.Skinning;
using osuTK.Graphics;

namespace osu.Game.Rulesets.Catch.Skinning.Legacy
{
    public class CatchLegacySkinTransformer : LegacySkinTransformer
    {
        /// <summary>
        /// For simplicity, let's use legacy combo font texture existence as a way to identify legacy skins from default.
        /// </summary>
        private bool providesComboCounter => this.HasFont(LegacyFont.Combo);

        public CatchLegacySkinTransformer(ISkinSource source)
            : base(source)
        {
        }

        public override Drawable GetDrawableComponent(ISkinComponent component)
        {
            if (component is SkinnableTargetComponent targetComponent)
            {
                switch (targetComponent.Target)
                {
                    case SkinnableTarget.MainHUDComponents:
                        var components = Source.GetDrawableComponent(component) as SkinnableTargetComponentsContainer;

                        if (providesComboCounter && components != null)
                        {
                            // catch may provide its own combo counter; hide the default.
                            // todo: this should be done in an elegant way per ruleset, defining which HUD skin components should be displayed.
                            foreach (var legacyComboCounter in components.OfType<LegacyComboCounter>())
                                legacyComboCounter.HiddenByRulesetImplementation = false;
                        }

                        return components;
                }
            }

            if (component is CatchSkinComponent catchSkinComponent)
            {
                switch (catchSkinComponent.Component)
                {
                    case CatchSkinComponents.Fruit:
                        if (GetTexture("fruit-pear") != null)
                            return new LegacyFruitPiece();

                        return null;

                    case CatchSkinComponents.Banana:
                        if (GetTexture("fruit-bananas") != null)
                            return new LegacyBananaPiece();

                        return null;

                    case CatchSkinComponents.Droplet:
                        if (GetTexture("fruit-drop") != null)
                            return new LegacyDropletPiece();

                        return null;

                    case CatchSkinComponents.Catcher:
                        // New elements will be ignored when the old element exists.
                        if (GetTexture(@"fruit-ryuuta") != null ||
                            GetTexture(@"fruit-ryuuta-0") != null)
                            return new LegacyCatcherOld();

                        if (GetTexture(@"fruit-catcher-idle") != null ||
                            GetTexture(@"fruit-catcher-idle-0") != null)
                            return new LegacyCatcherNew();

                        return null;

                    case CatchSkinComponents.CatchComboCounter:
                        if (providesComboCounter)
                            return new LegacyCatchComboCounter(Source);

                        return null;
                }
            }

            return Source.GetDrawableComponent(component);
        }

        public override IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup)
        {
            switch (lookup)
            {
                case CatchSkinColour colour:
                    var result = (Bindable<Color4>)Source.GetConfig<SkinCustomColourLookup, TValue>(new SkinCustomColourLookup(colour));
                    if (result == null)
                        return null;

                    result.Value = LegacyColourCompatibility.DisallowZeroAlpha(result.Value);
                    return (IBindable<TValue>)result;
            }

            return Source.GetConfig<TLookup, TValue>(lookup);
        }
    }
}