package com.wasu.cs.widget;

import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.List;

import cn.com.wasu.main.R;

/**
 * Created by chenming on 2016/11/10.
 *
 * @Description: 动画列表左侧的tab控件
 * @email chenming@wasu.com
 */

public class CartoonRecyclerView extends RecyclerView {

	private CartoonRecyclerView mRecycleView;
	// context
	private Context mContext;
	// 布局管理器
	private LinearLayoutManager mLayoutManager;
	// 数据集合（专用）
	private List<String> mData;
	// 记录当前的位置（0是初始位置）
	private int mViewPos = 0;
	// 获得焦点时设定item

	// Adapter全局（用于刷新数据）
	private CartoonTabAdapter mainAdapte;
	// 点击事件
	private CartoonRecyclerView.OnItemClickListener itemClickListener;
	// 焦点变换事件
	private CartoonRecyclerView.OnItemFocusChangeListener onItemFocusChangeListener;
	// item存在的布局文件
	private int mItemLayout;
	// 三个drawable三种样式
	private Drawable tabdefault, tabfocused, tabindicator;
	// leaveTag 失去焦点
	private View rightFocusView;
	private boolean mLeaveTag = false;
	private int tabsCount = 0;
	//
	LinearLayout mLinearLayout;
	TextView mTextView;


	public CartoonRecyclerView(Context context) {
		super(context);
		mContext = context;
		mRecycleView = CartoonRecyclerView.this;
		init();
	}

	public CartoonRecyclerView(Context context, @Nullable AttributeSet attrs) {
		super(context, attrs);
		mContext = context;
		mRecycleView = CartoonRecyclerView.this;
		init();
	}

	public CartoonRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		mContext = context;
		mRecycleView = CartoonRecyclerView.this;
		init();
	}

	private void init() {
		mLayoutManager = new LinearLayoutManager(mContext);
		// 设定布局管理器
		mRecycleView.setLayoutManager(mLayoutManager);
		// 设置适配器
		mainAdapte = new CartoonTabAdapter();
		mRecycleView.setAdapter(mainAdapte);
		// 设置间隔
		mRecycleView.addItemDecoration(new RecyclerView.ItemDecoration() {
			@Override
			public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
				super.getItemOffsets(outRect, view, parent, state);
				int count = parent.getChildCount();
				int spacingInPixels = getResources().getDimensionPixelOffset(R.dimen.d_20dp);
				int pos = parent.getChildPosition(view);
				if (pos == 0) {
					outRect.top = 0;
				} else if (pos == count - 1) {
					outRect.top = spacingInPixels;
					outRect.bottom = 0;
				} else {
					outRect.top = spacingInPixels;
				}
			}
		});
		// 要求RecycleView先于子控件获得焦点
		mRecycleView.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
		mRecycleView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
			@Override
			public void onFocusChange(View view, boolean hasFocus) {
				if (hasFocus) {
					setItemFocus();
				}
			}
		});
	}

	android.os.Handler handler = new android.os.Handler() {
		@Override
		public void handleMessage(Message msg) {
			if (msg.what == 0) {
				setItemFocus();
			}
		}
	};

	/**
	 * 必须调用这个setData
	 * SET后自动刷新
	 */
	public void setData(List<String> data) {
		if (data != null && data.size() > 0) {
			mData = data;
		}
		mainAdapte.notifyDataSetChanged();
	}

	public void addItemData(String name) {
		mData.add(name);
		mainAdapte.notifyItemChanged(mData.size());
	}

	public int getViewPos() {
		return mViewPos;
	}


	/**
	 * 设置布局和变化的三个文件
	 * <p>
	 * drawSelct0 -> item的默认样式
	 * drawSelct1 -> item被选中时带红框的样式
	 * drawSelct2 -> item选中后失去焦点的样式
	 */
	public void setLayoutAndDrawable(int itemLayout, Drawable drawSelct0, Drawable drawSelct1, Drawable drawSelct2) {
		mItemLayout = itemLayout;
		tabdefault = drawSelct0;
		tabfocused = drawSelct1;
		tabindicator = drawSelct2;
	}


	/**
	 * tab栏左侧获取焦点的视图
	 *
	 * @param
	 */
	public void setRightFocusView(View FocusView) {
		this.rightFocusView = FocusView;
	}

	@Override
	public LinearLayoutManager getLayoutManager() {
		return mLayoutManager;
	}

	/**
	 * Recycleview之间focus失效，使用外部调用来识别失去焦点
	 */
	public void setLeaveTag() {
		mLeaveTag = true;
	}


	private class CartoonTabAdapter extends RecyclerView.Adapter<CartoonTabAdapter.CartoonTabViewHolder> {

		@Override
		public CartoonTabViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
			CartoonTabViewHolder holder = new CartoonTabViewHolder(LayoutInflater.from(mContext).inflate(mItemLayout, parent, false));
			return holder;
		}

		@Override
		public void onBindViewHolder(final CartoonTabViewHolder holder, final int position) {
			tabsCount = getItemCount();
			holder.textview.setText(mData.get(position));
			// 这样设置才能使控件获得焦点
			holder.itemView.setFocusable(true);

			// 焦点变换监听
			View.OnFocusChangeListener onFocusChangeListener = new View.OnFocusChangeListener() {
				@Override
				public void onFocusChange(View view, boolean hasFoucs) {

					if (mLeaveTag) {
						mLeaveTag = false;
						setItemFocus();
						return;
					}
					mLeaveTag = false;
					if (hasFoucs) {
						setDefult();
						mViewPos = holder.getLayoutPosition();
						setHasFocus();
					} else {
						mViewPos = holder.getLayoutPosition();
						setLeaveFocus();
					}
				}
			};
			holder.itemView.setOnFocusChangeListener(onFocusChangeListener);

			// 添加点击事件
			if (itemClickListener != null) {
				holder.itemView.setOnClickListener(new View.OnClickListener() {
					@Override
					public void onClick(View view) {
						itemClickListener.onItemClick(position, mData.get(position));

					}
				});
			}
			//对触屏设备添加触摸事件监听
			holder.itemView.setOnTouchListener(new OnTouchListener() {
				@Override
				public boolean onTouch(View v, MotionEvent event) {
					if (event.getAction() == MotionEvent.ACTION_DOWN) {
						return v.requestFocus();
					}
					return false;
				}
			});
			//对按键焦点进行控制
			holder.itemView.setOnKeyListener(new OnKeyListener() {
				@Override
				public boolean onKey(View v, int keyCode, KeyEvent event) {
					if (event.getAction() == KeyEvent.ACTION_DOWN){
						switch (keyCode){
							case KeyEvent.KEYCODE_DPAD_RIGHT:
								if (rightFocusView != null) {
									rightFocusView.requestFocus();
									return true;
								}
								break;
							case  KeyEvent.KEYCODE_DPAD_DOWN:
								if (position == tabsCount - 1){
									mRecycleView.getItemView(mLayoutManager.findFirstVisibleItemPosition()).requestFocus();
									mViewPos = 0;
									return true;
								}
								break;
							case KeyEvent.KEYCODE_DPAD_UP:
								if (position == 0){
									mRecycleView.getItemView(tabsCount - 1).requestFocus();
									mViewPos = tabsCount - 1;
									return true;
								}
								break;
							default:
								break;
						}
					}
					return false;
				}
			});
		}


		@Override
		public int getItemCount() {
			return mData != null ? mData.size() : 0;
		}

		class CartoonTabViewHolder extends RecyclerView.ViewHolder {
			TextView textview;

			public CartoonTabViewHolder(View itemView) {
				super(itemView);
				textview = (TextView) itemView.findViewById(R.id.tab_name);
			}
		}
	}

	/**
	 * 获取指定位置的itemview
	 */
	private View getItemView(int index) {
		return mLayoutManager.findViewByPosition(index);
	}

	/***
	 * 设置焦点到position制定的位置
	 **/
	private void setItemFocus() {
		View view = getItemView(mViewPos);
		if (view == null) {
			handler.sendEmptyMessageDelayed(0, 100);
		} else {
			setHasFocus();
			view.requestFocus();
		}
	}


	/** -----------------------------焦点变换处理----------------------------- **/
	/**
	 * 恢复默认显示
	 */
	private void setDefult() {
		// 把上一个恢复默认
		mLinearLayout = (LinearLayout) getItemView(mViewPos);
		if (mLinearLayout != null) {
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
				mLinearLayout.setBackground(tabdefault);
			}
			// 字体恢复蓝色
			mTextView = (TextView) mLinearLayout.getChildAt(0);
			if (mTextView != null) {
				mTextView.setTextColor(getResources().getColor(R.color.btn_bule_text));
			}
		}
	}

	/**
	 * 设置focused状态
	 */
	private void setHasFocus() {
		// change background
		mLinearLayout = (LinearLayout) getItemView(mViewPos);
		if (mLinearLayout != null) {
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
				mLinearLayout.setBackground(tabfocused);
			}
			// set text white
			mTextView = (TextView) mLinearLayout.getChildAt(0);
			if (mTextView != null) {
				mTextView.setTextColor(getResources().getColor(R.color.white));
			}
		}
		// 焦点变换回调
		onItemFocusChangeListener.onFocusChange(mViewPos);
	}

	/**
	 * 设置indicator状态
	 **/
	private void setLeaveFocus() {
		mLinearLayout = (LinearLayout) getItemView(mViewPos);
		if (mLinearLayout != null) {
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
				mLinearLayout.setBackground(tabindicator);
			}
		}
	}


	/** -----------------------------事件接口---------------------------------- **/
	/**
	 * item 点击事件接口
	 *
	 * @param <T>
	 */
	public interface OnItemClickListener<T> {
		void onItemClick(int position, T data);
	}

	/**
	 * 设置点击事件
	 */
	public void setOnItemClickListener(CartoonRecyclerView.OnItemClickListener li) {
		itemClickListener = li;
	}

	/**
	 * item 焦点变换
	 */
	public interface OnItemFocusChangeListener {
		void onFocusChange(int position);
	}

	public void setOnItemFocusChangeListener(CartoonRecyclerView.OnItemFocusChangeListener li) {
		onItemFocusChangeListener = li;
	}
}