//--------------------------------------------------------
//    [Author]:           第二世界
//    [  Date ]:           Friday, September 15, 2017
//--------------------------------------------------------
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;
using TableConfig;

namespace Snxxz.UI
{

    public class NewItemGetBehaviour : MonoBehaviour
    {

        [SerializeField] ItemBehaviour m_ItemBehaviour;
        [SerializeField] Image[] m_Stars;
        [SerializeField] UIAlphaTween m_AlphaTween;
        [SerializeField] ScaleTween m_ScaleTween;

        [SerializeField] AnimationCurve curve;
        [SerializeField] AnimationCurve normalCurve;

        [SerializeField] float m_Duration = 0f;
        public float duration { get { return m_Duration; } }

        [SerializeField] float m_NormalRatio;
        public float normalRatio {
            get { return m_NormalRatio; }
        }

        Vector3 targetPosition;
        Vector3 startPosition;
        Action endCallBack = null;

        Vector3 normal = Vector3.up;
        float timer = 0f;
        float endTime = 0f;
        float distance = 0f;

        public void Begin(Item _item, Vector3 _from, Vector3 _to, Action _callBack)
        {
            startPosition = _from;
            targetPosition = _to;
            endTime = Time.time + duration;

            m_ItemBehaviour.SetItem(_item);

            var config = ConfigManager.Instance.GetTemplate<ItemConfig>(_item.id);
            for (int i = 0; i < m_Stars.Length; i++)
            {
                m_Stars[i].gameObject.SetActive(i < config.StarLevel);
            }

            this.gameObject.SetActive(true);
            this.transform.localPosition = startPosition;
            this.transform.localPosition = this.transform.localPosition.SetZ(0);

            Vector3 nl = Vector3.Normalize(targetPosition - startPosition);
            normal = new Vector3(-nl.y, nl.x, 0);
            distance = Vector3.Distance(startPosition, targetPosition);

            m_AlphaTween.Play();
            m_ScaleTween.Play();
            endCallBack = _callBack;
        }

        private void LateUpdate()
        {
            if (Time.time < endTime)
            {
                timer = duration - (endTime - Time.time);

                var t = timer / duration;
                var c1 = curve.Evaluate(t);
                var c2 = normalCurve.Evaluate(t) * normalRatio;
                var v1 = (targetPosition - startPosition) * c1 + startPosition;
                var v2 = normal * c2 * distance;

                this.transform.localPosition = v1 + v2;
            }
            else
            {
                this.gameObject.SetActive(false);

                if (endCallBack != null)
                {
                    endCallBack();
                    endCallBack = null;
                }
            }

        }

    }

}