/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.v17.leanback.widget;

import android.support.v17.leanback.tests.R;
import android.support.v7.widget.RecyclerView;
import android.support.v17.leanback.widget.BaseGridView;
import android.support.v17.leanback.widget.OnChildSelectedListener;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * @hide from javadoc
 */
public class GridActivity extends Activity {
    private static final String TAG = "GridActivity";

    public static final String EXTRA_LAYOUT_RESOURCE_ID = "layoutResourceId";
    public static final String EXTRA_NUM_ITEMS = "numItems";
    public static final String EXTRA_ITEMS = "items";
    public static final String EXTRA_STAGGERED = "staggered";
    public static final String SELECT_ACTION = "android.test.leanback.widget.SELECT";

    static final int DEFAULT_NUM_ITEMS = 100;
    static final boolean DEFAULT_STAGGERED = true;

    private static final boolean DEBUG = false;

    int mLayoutId;
    int mOrientation;
    int mNumItems;
    boolean mStaggered;

    int[] mGridViewLayoutSize;
    BaseGridView mGridView;
    int[] mItemLengths;

    private int mBoundCount;

    private View createView() {

        View view = getLayoutInflater().inflate(mLayoutId, null, false);
        mGridView = (BaseGridView) view.findViewById(R.id.gridview);
        mOrientation = mGridView instanceof HorizontalGridView ? BaseGridView.HORIZONTAL :
                BaseGridView.VERTICAL;
        mGridView.setWindowAlignment(BaseGridView.WINDOW_ALIGN_BOTH_EDGE);
        mGridView.setWindowAlignmentOffsetPercent(35);
        mGridView.setOnChildSelectedListener(new OnChildSelectedListener() {
            @Override
            public void onChildSelected(ViewGroup parent, View view, int position, long id) {
                if (DEBUG) Log.d(TAG, "onChildSelected position=" + position +  " id="+id);
            }
        });
        return view;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Intent intent = getIntent();

        mLayoutId = intent.getIntExtra(EXTRA_LAYOUT_RESOURCE_ID, R.layout.horizontal_grid);
        mStaggered = intent.getBooleanExtra(EXTRA_STAGGERED, DEFAULT_STAGGERED);
        mItemLengths = intent.getIntArrayExtra(EXTRA_ITEMS);
        if (mItemLengths == null) {
            mNumItems = intent.getIntExtra(EXTRA_NUM_ITEMS, DEFAULT_NUM_ITEMS);
            mItemLengths = new int[mNumItems];
            for (int i = 0; i < mItemLengths.length; i++) {
                if (mOrientation == BaseGridView.HORIZONTAL) {
                    mItemLengths[i] = mStaggered ? (int)(Math.random() * 180) + 180 : 240;
                } else {
                    mItemLengths[i] = mStaggered ? (int)(Math.random() * 120) + 120 : 160;
                }
            }
        } else {
            mNumItems = mItemLengths.length;
        }

        super.onCreate(savedInstanceState);

        if (DEBUG) Log.v(TAG, "onCreate " + this);

        RecyclerView.Adapter adapter = new MyAdapter();

        View view = createView();

        mGridView.setAdapter(new MyAdapter());
        setContentView(view);
    }

    @Override
    protected void onNewIntent(Intent intent) {
        if (DEBUG) Log.v(TAG, "onNewIntent " + intent+ " "+this);
        if (intent.getAction().equals(SELECT_ACTION)) {
            int position = intent.getIntExtra("SELECT_POSITION", -1);
            if (position >= 0) {
                mGridView.setSelectedPosition(position);
            }
        }
        super.onNewIntent(intent);
    }

    private OnFocusChangeListener mItemFocusChangeListener = new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (hasFocus) {
                v.setBackgroundColor(Color.YELLOW);
            } else {
                v.setBackgroundColor(Color.LTGRAY);
            }
        }
    };

    void resetBoundCount() {
        mBoundCount = 0;
    }

    int getBoundCount() {
       return mBoundCount;
    }

    void swap(int index1, int index2) {
        if (index1 == index2) {
            return;
        } else if (index1 > index2) {
            int index = index1;
            index1 = index2;
            index2 = index;
        }
        int value = mItemLengths[index1];
        mItemLengths[index1] = mItemLengths[index2];
        mItemLengths[index2] = value;
        mGridView.getAdapter().notifyItemMoved(index1, index2);
        mGridView.getAdapter().notifyItemMoved(index2 - 1, index1);
    }

    void changeArraySize(int length) {
        mNumItems = length;
        mGridView.getAdapter().notifyDataSetChanged();
    }

    int[] removeItems(int index, int length) {
        int[] removed = new int[length];
        System.arraycopy(mItemLengths, index, removed, 0, length);
        System.arraycopy(mItemLengths, index + length, mItemLengths, index,
                mNumItems - index - length);
        mNumItems -= length;
        mGridView.getAdapter().notifyItemRangeRemoved(index, length);
        return removed;
    }

    void addItems(int index, int[] items) {
        int length = items.length;
        System.arraycopy(mItemLengths, index, mItemLengths, index + length, mNumItems - index);
        System.arraycopy(items, 0, mItemLengths, index, length);
        mNumItems += length;
        mGridView.getAdapter().notifyItemRangeInserted(index, length);
    }

    class MyAdapter extends RecyclerView.Adapter {

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (DEBUG) Log.v(TAG, "createViewHolder " + viewType);
            TextView textView = new TextView(parent.getContext());
            textView.setTextColor(Color.BLACK);
            textView.setFocusable(true);
            textView.setFocusableInTouchMode(true);
            textView.setOnFocusChangeListener(mItemFocusChangeListener);
            return new ViewHolder(textView);
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder baseHolder, int position) {
            if (DEBUG) Log.v(TAG, "bindViewHolder " + position + " " + baseHolder);
            mBoundCount++;
            ViewHolder holder = (ViewHolder) baseHolder;
            ((TextView) holder.itemView).setText("Item "+position);
            holder.itemView.setBackgroundColor(Color.LTGRAY);
            if (mOrientation == BaseGridView.HORIZONTAL) {
                holder.itemView.setLayoutParams(new ViewGroup.MarginLayoutParams(
                        mItemLengths[position], 80));
            } else {
                holder.itemView.setLayoutParams(new ViewGroup.MarginLayoutParams(
                        240, mItemLengths[position]));
            }
        }

        @Override
        public int getItemCount() {
            return mNumItems;
        }
    }

    static class ViewHolder extends RecyclerView.ViewHolder {

        public ViewHolder(View v) {
            super(v);
        }
    }
}