using Demo.Attr;
using System;
using System.Collections;
using UnityEngine;

namespace Demo.Game
{
    [Scriptable]
    public class SplineAnchor : ScriptableObject, IDependOnSplineCore, IDependOnSplineRenderer
    {
        public static SplineAnchor Make()
        {
            return new GameObject().AddComponent<SplineAnchor>();
        }

        public SplineCore MySplineCore { get; set; }
        public BasicSplineRenderer MySplineRenderer { get; set; }
        public float MySplineOffset = 0;
        private Action Updater = null;

        protected override void UpdateTicks(float currentTime, float deltaTime, TickType tickType)
        {
            base.UpdateTicks(currentTime, deltaTime, tickType);
            Updater?.Invoke();
        }

        /// <summary>
        /// 加载并绑定到新样条线
        /// </summary>
        /// <param name="path">对象路径, 不存在时则立刻加载</param>
        [Convention.RScript.Variable.Attr.Method]
        public void LoadSpline(string path)
        {
            this.LoadSplineTool(path);
        }

        /// <summary>
        /// 必须先执行LoadSpline加载样条线
        /// </summary>
        /// <param name="offset">百分比所在位置，取值范围是[0，1]</param>
        [Convention.RScript.Variable.Attr.Method]
        public void EvaluatePosition(float offset)
        {
            MySplineOffset = offset;
            Updater = () => transform.position = MySplineCore.MySplineComputer.EvaluatePosition(MySplineOffset);
        }

        /// <summary>
        /// 绑定到样条线渲染器上
        /// 并设置跟随指定时间的时刻渲染器所生成的头部
        /// </summary>
        /// <param name="splineRenderer">样条线渲染器对象</param>
        /// <param name="time">时刻</param>
        /// <param name="isFollowPosition">是否跟随位置, 默认开启</param>
        /// <param name="isFollowRotation">是否跟随旋转, 默认开启</param>
        [Convention.RScript.Variable.Attr.Method]
        public void LoadSplineRenderer(BasicSplineRenderer splineRenderer, float time, bool isFollowPosition = true, bool isFollowRotation = true)
        {
            MySplineRenderer = splineRenderer;
            MySplineOffset = time;
            bool bIsFollowPosition = isFollowPosition;
            bool bIsFollowRotation = isFollowRotation;
            if (bIsFollowPosition && bIsFollowRotation)
            {
                Updater = () =>
                {
                    var result = MySplineRenderer.EvaluateClipTo(MySplineOffset);
                    transform.SetPositionAndRotation(result.position, result.rotation);
                };
            }
            else if (bIsFollowPosition)
            {
                Updater = () =>
                {
                    transform.position = MySplineRenderer.EvaluateClipToPosition(MySplineOffset);
                };
            }
            else
            {
                Updater = () =>
                {
                    var result = MySplineRenderer.EvaluateClipTo(MySplineOffset);
                    transform.rotation = result.rotation;
                };
            }
        }
    }
}