// 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.Collections.Generic;
using System.Linq;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Sprites;
using osu.Game.Configuration;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Rulesets.Osu.Objects.Drawables;

namespace osu.Game.Rulesets.Osu.Mods
{
    public class OsuModDeflate : Mod, IReadFromConfig, IApplicableToDrawableHitObjects
    {
        public override string Name => "Deflate";

        public override string Acronym => "DF";

        public override IconUsage Icon => FontAwesome.Solid.CompressArrowsAlt;

        public override ModType Type => ModType.Fun;

        public override string Description => "Become one with the approach circle...";

        public override double ScoreMultiplier => 1;

        private Bindable<bool> increaseFirstObjectVisibility = new Bindable<bool>();

        public void ReadFromConfig(OsuConfigManager config)
        {
            increaseFirstObjectVisibility = config.GetBindable<bool>(OsuSetting.IncreaseFirstObjectVisibility);
        }

        public void ApplyToDrawableHitObjects(IEnumerable<DrawableHitObject> drawables)
        {
            foreach (var drawable in drawables.Skip(increaseFirstObjectVisibility.Value ? 1 : 0))
            {
                switch (drawable)
                {
                    case DrawableSpinner _:
                        continue;

                    default:
                        drawable.ApplyCustomUpdateState += ApplyCustomState;
                        break;
                }
            }
        }

        protected virtual void ApplyCustomState(DrawableHitObject drawable, ArmedState state)
        {
            var h = (OsuHitObject)drawable.HitObject;

            // apply grow effect
            switch (drawable)
            {
                case DrawableSliderHead _:
                case DrawableSliderTail _:
                    // special cases we should *not* be scaling.
                    break;

                case DrawableSlider _:
                case DrawableHitCircle _:
                    {
                        using (drawable.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
                            drawable.ScaleTo(2f).Then().ScaleTo(1f, h.TimePreempt); // sole difference to grow mod
                        break;
                    }
            }

            // remove approach circles
            switch (drawable)
            {
                case DrawableHitCircle circle:
                    // we don't want to see the approach circle
                    using (circle.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
                        circle.ApproachCircle.Hide();
                    break;
            }
        }
    }
}