using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Ichni
{
    
    /// <summary>
    /// 自定义曲线预设
    /// </summary>
    public static class CustomCurvePresets
    {

        /// <summary>
        /// 瞬间完成
        /// </summary>
        /// <returns></returns>
        public static AnimationCurve Instant()
        {
            Keyframe[] keys = new Keyframe[2];
            keys[0] = new Keyframe(0, 1, 0, 0);
            keys[1] = new Keyframe(1, 1, 0, 0);
            return new AnimationCurve(keys);
        }
        
        /// <summary>
        /// 抛物线曲线，在中间达到最大值，两端为起始值
        /// </summary>
        /// <param name="totalTime">总时间</param>
        /// <param name="startValue">起始（和结束）值</param>
        /// <param name="peakValue">中点最大值</param>
        public static AnimationCurve Parabolic(float totalTime, float startValue, float peakValue)
        {
            Keyframe[] keys = new Keyframe[3];
            keys[0] = new Keyframe(0, startValue, 0, 0);
            keys[1] = new Keyframe(totalTime / 2, peakValue, 0, 0);
            keys[2] = new Keyframe(totalTime, startValue, 0, 0);
            return new AnimationCurve(keys);
        }

        /// <summary>
        /// 自定义峰值点位置的抛物线曲线，在指定时间点达到最大值，两端为起始值
        /// </summary>
        /// <param name="totalTime">总时间</param>
        /// <param name="startValue">起始（和结束）值</param>
        /// <param name="peakValue">最大值</param>
        /// <param name="peakTimePercent">最大值的比例点</param>
        /// <returns></returns>
        public static AnimationCurve CustomPeakTimeParabolic(float totalTime, float startValue, float peakValue, float peakTimePercent)
        {
            Keyframe[] keys = new Keyframe[3];
            keys[0] = new Keyframe(0, startValue, 0, 0);
            keys[1] = new Keyframe(totalTime * peakTimePercent, peakValue, 0, 0);
            keys[2] = new Keyframe(totalTime, startValue, 0, 0);
            return new AnimationCurve(keys);
        }
    }
}