//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using OpenTK;
using OpenTK.Graphics;
using osu.Framework;
using osu.Framework.Graphics.Transformations;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace osu.Game.Graphics.UserInterface
{
    /// <summary>
    /// Allows tint and vertical scaling animation. Used in osu!taiko and osu!mania.
    /// </summary>
    public class AlternativeComboCounter : ComboCounter
    {
        public Color4 OriginalColour;
        public Color4 TintColour = Color4.OrangeRed;
        public int TintDuration = 250;
        public float ScaleFactor = 2;
        public EasingTypes TintEasing = EasingTypes.None;
        public bool CanAnimateWhenBackwards = false;

        public override void Load(BaseGame game)
        {
            base.Load(game);

            OriginalColour = Colour;
        }

        public override void ResetCount()
        {
            SetCountWithoutRolling(0);
        }

        protected override ulong getProportionalDuration(ulong currentValue, ulong newValue)
        {
            ulong difference = currentValue > newValue ? currentValue - newValue : currentValue - newValue;
            return difference * RollingDuration;
        }

        protected virtual void transformAnimate(ulong newValue)
        {
            countSpriteText.FadeColour(TintColour, 0);
            countSpriteText.ScaleTo(new Vector2(1, ScaleFactor));
            countSpriteText.FadeColour(OriginalColour, TintDuration, TintEasing);
            countSpriteText.ScaleTo(new Vector2(1, 1), TintDuration, TintEasing);
        }

        protected override void transformVisibleCount(ulong currentValue, ulong newValue)
        {
            countSpriteText.Text = formatCount(newValue);

            if (newValue == 0)
                countSpriteText.FadeOut(TintDuration);
            else
                countSpriteText.Show();

            if (newValue > currentValue || CanAnimateWhenBackwards)
                transformAnimate(newValue);
        }
    }
}