using DG.Tweening;
using System;
using UnityEngine;
using XGame.Framework.FGUI;
using XGame.Framework.Interfaces;
using XGame.Framework.Time;


namespace FL.FGUI.Actions
{
    /// <summary>
    /// MoveLineAction的参数
    /// </summary>
    public struct UIMoveActionArgs
    {
        public Vector3 from;
        public Vector3 to;
        /// <summary>
        /// 单位:毫秒
        /// </summary>
        public int duration;
        /// <summary>
        /// 延迟，单位: 毫秒
        /// </summary>
        public int delay;
        public float offset;
        public Ease ease;
        public Action<Vector3> onUpdate;
        public Action onComplete;
    }

    public class UIMoveBezierAction : IAction, IPauseable, ITimeScalable
    {
        public UIMoveActionArgs args;
        private Tween _tween;
        private bool _paused;

        float ITimeScalable.TimeScale
        {
            get => _tween?.timeScale ?? 1;
            set
            {
                if (_tween == null)
                {
                    return;
                }
                _tween.timeScale = value;
            }
        }

        void IReference.Clear()
        {
            _tween?.Kill();
            _tween = null;
            args = default;
            _paused = false;
        }
        public void Start(FguiViewModel viewModel)
        {
            // 贝塞尔曲线运动
            viewModel.Pos = args.from;
            var timeScale = UnityEngine.Random.Range(0.2f, 0.8f);
            var linePoint = Vector3.Lerp(args.from, args.to, timeScale);
            var dir = Vector3.Cross(args.to - args.from, Vector3.forward).normalized; //运动方向的法线
            var offset = args.offset > 0 ? args.offset : 300;
            var disOffset = UnityEngine.Random.Range(-offset, offset);
            var center = linePoint + dir * disOffset;
            var totalTime = args.duration * 0.001f;
            var timeTween = DOTween.To(() => 0, (t) =>
            {
                var tNormal = t / totalTime;
                var pos = args.from.BezierPoint(center, args.to, tNormal);
                viewModel.Pos = pos;
                args.onUpdate.SafeInvoke(pos);
            }, totalTime, totalTime);
            if (args.delay > 0)
                timeTween.SetDelay(args.delay * 0.001f);
            timeTween.SetEase(args.ease == Ease.Unset ? Ease.OutQuad : args.ease);
            _tween = timeTween;
            timeTween.onComplete = () =>
            {
                var callback = args.onComplete;
                _tween = null;
                args = default;
                callback?.Invoke();
            };
        }

        void IAction.Start(FguiViewModel viewModel)
        {
            Start(viewModel);
        }


        void IPauseable.Pause()
        {
            if (_tween == null || _paused)
            {
                return;
            }
            _paused = true;
            _tween.Pause();
        }
        void IPauseable.Resume()
        {
            if (_paused)
            {
                _paused = false;
                _tween?.Play();
            }
        }

    }
}