using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using DG;
using DG.Tweening;

/// <summary>
/// 描述：血条
/// 作者：WJ
/// </summary>
public class Hpbar : MonoBehaviour
{
    /// <summary>
    /// 自身Transform
    /// </summary>
    private RectTransform mRectTransform = null;

    /// <summary>
    /// 角色
    /// </summary>
    private Role mRole = null;

    /// <summary>
    /// 图片
    /// </summary>
    private Image mImage = null;

    /// <summary>
    /// 图片底
    /// </summary>
    private Image mImageD = null;

    /// <summary>
    /// 时间
    /// </summary>
    private float mCurTime = 0;

    /// <summary>
    /// 血条的上次进度
    /// </summary>
    private float mLastHPAmount = 1.0f;

    /// <summary>
    /// 当前进度
    /// </summary>
    private float mCurAmount = 0;

    /// <summary>
    /// 差值进度
    /// </summary>
    private float mOffsetAmount = 0;

    /// <summary>
    /// 父节点RectTransform
    /// </summary>
    private RectTransform mRootRectTransform = null;

    private float mDelayImageD = 1;

    /// <summary>
    /// 设置进度条进度
    /// </summary>
    /// <param name="val">值</param>
    public void UpdateHPProgress(float val, float hideTime = 5.0f)
    {
        if (mImage)
        {
            mImage.fillAmount = val;
            mCurTime = hideTime;
            mCurAmount = val;

            mOffsetAmount = mLastHPAmount - val;
            mLastHPAmount = val;
            mImageD.DOFillAmount(mCurAmount, 1f);
        }
    }

    /// <summary>
    /// 初始化
    /// </summary>
    /// <param name="role"></param>
    /// <param name="val"></param>
    public void Init(RectTransform rect, Role role, float val)
    {
        mRootRectTransform = rect;
        mRole = role;
        mRectTransform = transform as RectTransform;
        mRectTransform.anchoredPosition = World2UI(mRole.transform.position + Vector3.up * 2.0f);

        transform.Find("Image").gameObject.SetActive(true);
        mImage = transform.Find("Bar").GetComponent<Image>();
        mImageD = transform.Find("BarD").GetComponent<Image>();
        mImage.gameObject.SetActive(true);

        UpdateHPProgress(val);
    }

    // Update is called once per frame
    void FixedUpdate()
    {
        if (mRole == null || mRole.isDie)
        {
            Destroy(gameObject);

            return;
        }

        // 更新血条底
        if (mOffsetAmount > 0)
        {
            //延迟等待
            if(mDelayImageD > 0)
            {
                mDelayImageD -= Time.deltaTime;
            }
            else
            {
                mOffsetAmount -= Time.deltaTime * 0.5f;
                if (mOffsetAmount <= 0)
                {
                    //mImageD.fillAmount = mCurAmount;
                    mDelayImageD = 1;
                }
                else
                {
                    //mImageD.fillAmount = mCurAmount + mOffsetAmount;
                }
            }
            
        }

        // 更新显示时间
        if (mCurTime > 0)
        {
            mCurTime -= Time.deltaTime;
            if (mCurTime <= 0)
            {
                gameObject.SetActive(false);
            }
        }

        mRectTransform.anchoredPosition = Vector2.Lerp(mRectTransform.anchoredPosition, World2UI(mRole.transform.position + Vector3.up * 2.0f), 10 * Time.deltaTime);
    }


    /// <summary>
    /// 世界坐标转成UI坐标
    /// </summary>
    /// <param name="wpos">世界坐标</param>
    /// <returns>UI坐标</returns>
    public Vector2 World2UI(Vector3 wpos)
    {
        if (Camera.main == null)
        {
            return Vector2.zero;
        }

        //世界坐标 -> ViewPort坐标 
        Vector2 viewPos = Camera.main.WorldToViewportPoint(wpos);

        //ViewPort坐标 -> UGUI坐标   	
        return new Vector2(mRootRectTransform.rect.width * viewPos.x, mRootRectTransform.rect.height * viewPos.y);
    }
}