package com.wpc.library.util.MoveRecycleView;

import android.graphics.Canvas;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.ItemTouchHelper;
import android.util.Log;

public class ItemTouchCallback extends ItemTouchHelper.Callback {

    private ItemTouchHelperAdapter mAdapter;

    public ItemTouchCallback(ItemTouchHelperAdapter adapter) {
        mAdapter = adapter;
    }

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        //int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN; //允许上下的拖动
        //int dragFlags =ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT; //允许左右的拖动
        //int swipeFlags = ItemTouchHelper.LEFT; //只允许从右向左侧滑
        //int swipeFlags = ItemTouchHelper.DOWN; //只允许从上向下侧滑
        //一般使用makeMovementFlags(int,int)或makeFlag(int, int)来构造我们的返回值
        //makeMovementFlags(dragFlags, swipeFlags)

        int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT; //允许上下左右的拖动
        return makeMovementFlags(dragFlags, 0);
    }


    @Override
    public boolean isLongPressDragEnabled() {
        return true;//长按启用拖拽
    }

    @Override
    public boolean isItemViewSwipeEnabled() {
        return false; //不启用拖拽删除
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
        //通过接口传递拖拽交换数据的起始位置和目标位置的ViewHolder
        if (direction != 0) {
            mAdapter.onItemMove(source, target, direction);
            direction = 0;
        }
        return true;
    }


    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        //移动删除回调,如果不用可以不用理
        // mAdapter.onItemDissmiss(viewHolder);
    }

    @Override
    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
        super.onSelectedChanged(viewHolder, actionState);
        if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
            //当滑动或者拖拽view的时候通过接口返回该ViewHolder
            mAdapter.onItemSelect(viewHolder);
        }
    }

    @Override
    public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        super.clearView(recyclerView, viewHolder);
        if (!recyclerView.isComputingLayout()) {
            //当需要清除之前在onSelectedChanged或者onChildDraw,onChildDrawOver设置的状态或者动画时通过接口返回该ViewHolder
            mAdapter.onItemClear(viewHolder);
        }
    }

    int direction = 0;//1、上拉；2、下滑；3、左滑；4、右滑
    float itemWidth = 0;
    float itemHeight = 0;

    @Override
    public void onChildDrawOver(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        super.onChildDrawOver(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
        int fromPosition = viewHolder.getAdapterPosition();

        if (itemWidth == 0) {
            //获取单个Item宽度
            itemWidth = recyclerView.getChildAt(fromPosition).getMeasuredWidth() / 2;
        }

        if (itemHeight == 0) {
            //获取单个Item高度
            itemHeight = recyclerView.getChildAt(fromPosition).getMeasuredHeight() / 2;
        }

        Log.e("mResult", "scrollX:" + itemWidth + "---scrollY:" + itemHeight);
        if (dX < 0 && Math.abs(dX) >= itemWidth) {
            direction = 3;
        } else if (dX > 0 && Math.abs(dX) >= itemWidth) {
            direction = 4;
        } else if (dY < 0 && Math.abs(dY) >= itemHeight) {
            direction = 1;
        } else if (dY > 0 && Math.abs(dY) >= itemHeight) {
            direction = 2;
        } else {
            direction = 0;
        }

        if (Math.abs(dX) >= itemWidth || Math.abs(dY) >= itemHeight) {
            onMove(recyclerView, viewHolder, viewHolder);
        }

    }
}