using UnityEngine;

namespace Superlazy.UI
{
    public class SLUIMove : SLUIOnOffTransition
    {
        public float onDuration = 0.3f;
        public float offDuration = 0.3f;
        public Vector3 offset;

        private RectTransform rectTrasform;
        private float currentTime;
        private Vector3 defaultPosition;

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

        protected override void Init()
        {
            defaultPosition = rectTrasform.anchoredPosition3D - offset;

            var newOffset = Vector3.zero;
            if (currentState == false)
            {
                currentTime = 0;
            }
            else
            {
                newOffset = offset;
                currentTime = 1;
            }

            rectTrasform.anchoredPosition3D = newOffset + defaultPosition;
        }

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

            if (currentState)
            {
                if (onDuration == 0)
                {
                    currentTime = 1;
                }
                else
                {
                    currentTime += Time.unscaledDeltaTime / onDuration;
                }

                if (currentTime >= 1.0f)
                {
                    currentTime = 1.0f;
                    result = true;
                }
            }
            else
            {
                if (offDuration == 0)
                {
                    currentTime = 0;
                }
                else
                {
                    currentTime -= Time.unscaledDeltaTime / offDuration;
                }

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

            var ease = 1 - Mathf.Pow(1 - currentTime, 4); // * currentTime; // 0~1

            var newOffset = Vector3.Lerp(Vector3.zero, offset, ease);
            rectTrasform.anchoredPosition3D = newOffset + defaultPosition;

            return result;
        }

        protected override void ForceDisable()
        {
            currentTime = 0.0f;
            rectTrasform.anchoredPosition3D = defaultPosition;
        }
    }
}