package com.doumee.lib_coremodel.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;

import androidx.core.content.ContextCompat;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import com.doumee.lib_coremodel.R;

public class MyRefreshLayout extends SwipeRefreshLayout implements
        OnScrollListener {

   /**
    * 滑动到最下面时的上拉操作
    */

   private int mTouchSlop;
   /**
    * listview实例
    */
   private AbsListView mListView;

   private ListView listView;
   private View footerLayout;

   /**
    * 上拉监听器, 到了最底部的上拉加载操作
    */
   private ILoadListener mOnLoadListener;

   /**
    * 按下时的y坐标
    */
   private int mYDown;
   /**
    * 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉
    */
   private int mLastY;
   /**
    * 是否在加载中 ( 上拉加载更多 )
    */
   private boolean isLoading = false;

   private boolean isFling = false;


   /**
    * 加载更多的监听器
    */
   public static interface ILoadListener {
      public void onLoad();

   }


   /**
    * @param context
    */
   public MyRefreshLayout(Context context) {
      this(context, null);
      initData(context);
   }
   public MyRefreshLayout(Context context, AttributeSet attrs) {
      super(context, attrs);
      initData(context);
   }

   private void initData(Context context) {
      mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
      int c =  ContextCompat.getColor(getContext(), R.color.colorPrimary);
      setColorSchemeColors(c);
   }
   @Override
   protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
      super.onLayout(changed, left, top, right, bottom);
      // 初始化ListView对象
      if (mListView == null) {
         getListView();
      }
   }

   /**
    * 获取ListView对象
    */
   private void getListView() {
      int childs = getChildCount();
      if (childs > 0) {
         View childView = getChildAt(0);
         if (childView instanceof AbsListView) {
            mListView = (AbsListView) childView;
            // 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载
            mListView.setOnScrollListener(this);

            if (childView instanceof ListView){
               //listView = (ListView) mListView;
               //footerLayout = View.inflate(getContext(),R.layout.refresh_foot_view,null);
               //listView.addFooterView(footerLayout);
               //this.footerLayout.setVisibility(View.GONE);
               //this.footerLayout.setPadding(0, -footerLayout.getHeight(), 0, 0);
            }
         }
      }
   }

   /**
    */
   @Override
   public boolean dispatchTouchEvent(MotionEvent event) {
      final int action = event.getAction();
      switch (action) {
         case MotionEvent.ACTION_DOWN:
            // 按下
            mYDown = (int) event.getRawY();
            break;

         case MotionEvent.ACTION_MOVE:
            mLastY = 1000;
            // 移动
            mLastY = (int) event.getRawY();
            break;

         case MotionEvent.ACTION_UP:
            // 抬起
            if (canLoad() && isFling) {
               loadData();
            }
            break;
         default:
            break;
      }
      return super.dispatchTouchEvent(event);
   }

   /**
    * 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作.
    *
    * @return
    */
   private boolean canLoad() {
      return isBottom() && !isLoading && isPullUp();
   }

   /**
    * 判断是否到了最底部
    */
   private boolean isBottom() {
      if (mListView != null && mListView.getAdapter() != null) {
         if (mListView.getLastVisiblePosition() == (mListView.getAdapter().getCount() - 1)) {
            final View bottomChildView =
                  mListView.getChildAt(mListView.getLastVisiblePosition() - mListView.getFirstVisiblePosition());
            if (bottomChildView != null) {
               return mListView.getHeight() >= bottomChildView.getBottom();
            }
         }
      }
      return false;
   }

   /**
    * 是否是上拉操作
    *
    * @return
    */
   private boolean isPullUp() {
      Log.i("ssssss", "down" + mYDown + "      up" + mLastY);
      return (mYDown - mLastY) >= 100;
   }

   /**
    * 如果到了最底部,而且是上拉操作.那么执行onLoad方法
    */
   private void loadData() {
      if (mOnLoadListener != null) {
         if (null != footerLayout){
            this.footerLayout.setVisibility(View.VISIBLE);
            this.footerLayout.setPadding(0, 0, 0, 0);
         }

         // 设置状态为正在加载
         setLoading(true);
         //加载下一页数据
         mOnLoadListener.onLoad();
      }
   }

   /**
    * @param loading
    */
   public void setLoading(boolean loading) {
      isLoading = loading;
      if (!isLoading) {
         mYDown = 0;
         mLastY = 0;
         if (null != footerLayout) {
            this.footerLayout.setVisibility(View.GONE);
            this.footerLayout.setPadding(0, -footerLayout.getHeight(), 0, 0);
         }
      }
   }

   /**
    * @param loadListener
    */
   public void setOnLoadListener(ILoadListener loadListener) {
      mOnLoadListener = loadListener;
   }

   public boolean isFling() {
      return isFling;
   }

   public void setFling(boolean fling) {
      isFling = fling;
   }

   @Override
   public void onScrollStateChanged(AbsListView view, int scrollState) {
      if (scrollState != SCROLL_STATE_IDLE) {
         setFling(true);
      }
      if (canLoad() && scrollState == SCROLL_STATE_IDLE && isFling()) {
         loadData();
      }
   }

   @Override
   public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                        int totalItemCount) {
   }
}