using UnityEngine;

namespace Superlazy.UI
{
    public class SLUIMoveTo : SLUIOnOffTransition
    {
        public float startDelay = 0.0f;

        public bool useTimeBase = true;
        public float onDuration = 0.3f;
        public float offDuration = 0.0f;

        public bool useSpeedBase = false;
        public float onMoveSpeed = 1.0f;
        public float offMoveSpeed = 1.0f;

        public float scaleTo = 1.0f;
        public bool moveArc = false;
        public string targetPositionBind;
        public string endEffect;

        //public Vector3 offset;

        private RectTransform rectTransform;
        private float currentTime;
        private readonly float currentDelay;

        protected override void Validate()
        {
            rectTransform = GetComponent<RectTransform>();
        }

        protected override void Init()
        {
            if (currentState == false)
            {
                currentTime = 0;
            }
            else
            {
                currentTime = 1;
            }
        }

        protected override bool OnUpdate(bool forceUpdate = false)
        {
            var result = false;

            var defaultPosition = rectTransform.parent.TransformPoint(Vector3.zero);
            var pos = SLGame.Session.Get(targetPositionBind);
            var targetPosition = new Vector3(pos["X"], pos["Y"], pos["Z"]);
            var distance = (defaultPosition - targetPosition).magnitude;
            if (useSpeedBase)
            {
                onDuration = onMoveSpeed == 0 ? 0 : distance / onMoveSpeed;
                offDuration = offMoveSpeed == 0 ? 0 : distance / offMoveSpeed;
            }

            var ease = currentState ? 0.0f : 1.0f;
            if (currentState)
            {
                if (onDuration == 0)
                {
                    currentTime = onDuration;
                }
                else
                {
                    currentTime += Time.unscaledDeltaTime;
                    if ((currentTime - startDelay) > onDuration) currentTime = onDuration + startDelay;
                    if (currentTime > startDelay)
                    {
                        ease = (currentTime - startDelay) / onDuration;
                    }
                    else
                    {
                        ease = 0;
                    }
                }

                if (currentTime - startDelay >= onDuration)
                {
                    if (string.IsNullOrEmpty(endEffect) == false)
                    {
                        SLGame.Event(endEffect, SLEntity.Empty);
                    }
                    result = true;
                }
            }
            else
            {
                if (offDuration == 0)
                {
                    currentTime = 0;
                }
                else
                {
                    currentTime -= Time.unscaledDeltaTime;
                    if (currentTime < 0) currentTime = 0;
                    ease = currentTime / offDuration;
                }

                if (currentTime <= 0.0f)
                {
                    currentTime = 0.0f;
                    result = true;
                }
            }

            var newScale = Mathf.Lerp(1.0f, scaleTo, ease);
            rectTransform.localScale = new Vector3(newScale, newScale, newScale);

            if (moveArc)
            {
                var newX = Mathf.Lerp(defaultPosition.x, targetPosition.x, Mathf.Pow(ease, 0.7f));
                var newY = Mathf.Lerp(defaultPosition.y, targetPosition.y, 1 - Mathf.Pow(1 - ease, 0.7f));
                var newZ = Mathf.Lerp(defaultPosition.z, targetPosition.z, Mathf.Pow(ease, 0.7f));
                var newPosition = new Vector3(newX, newY, newZ);
                rectTransform.position = newPosition;
            }
            else
            {
                var newPosition = Vector3.Lerp(defaultPosition, targetPosition, ease);
                rectTransform.position = newPosition;
            }

            return result;
        }

        protected override void ForceDisable()
        {
            currentTime = 0.0f;
            rectTransform.localPosition = Vector3.zero;
        }
    }
}