/*
 * Copyright (C) 2014 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 com.example.android.tvleanback.ui;

import android.app.LoaderManager;
import android.content.Intent;
import android.content.Loader;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.support.v17.leanback.app.BackgroundManager;
import android.support.v17.leanback.app.BrowseFragment;
import android.support.v17.leanback.widget.ArrayObjectAdapter;
import android.support.v17.leanback.widget.HeaderItem;
import android.support.v17.leanback.widget.ImageCardView;
import android.support.v17.leanback.widget.ListRow;
import android.support.v17.leanback.widget.ListRowPresenter;
import android.support.v17.leanback.widget.OnItemViewClickedListener;
import android.support.v17.leanback.widget.OnItemViewSelectedListener;
import android.support.v17.leanback.widget.Presenter;
import android.support.v17.leanback.widget.Row;
import android.support.v17.leanback.widget.RowPresenter;
import android.support.v4.app.ActivityOptionsCompat;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.Toast;


import com.bumptech.glide.Glide;
import com.bumptech.glide.load.resource.drawable.GlideDrawable;
import com.bumptech.glide.request.animation.GlideAnimation;
import com.bumptech.glide.request.target.SimpleTarget;

import com.example.android.tvleanback.R;
import com.example.android.tvleanback.data.VideoItemLoader;
import com.example.android.tvleanback.data.VideoProvider;
import com.example.android.tvleanback.model.Movie;
import com.example.android.tvleanback.presenter.CardPresenter;
import com.example.android.tvleanback.presenter.GridItemPresenter;
import com.example.android.tvleanback.recommendation.UpdateRecommendationsService;

import java.net.URI;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;

/*
 * Main class to show BrowseFragment with header and rows of videos
 */
public class MainFragment extends BrowseFragment implements
        LoaderManager.LoaderCallbacks<HashMap<String, List<Movie>>> {
    private static final String TAG = "MainFragment";

    private static int BACKGROUND_UPDATE_DELAY = 300;
    private static String mVideosUrl;
    private final Handler mHandler = new Handler();
    private ArrayObjectAdapter mRowsAdapter;
    private Drawable mDefaultBackground;
    private DisplayMetrics mMetrics;
    private Timer mBackgroundTimer;
    private URI mBackgroundURI;
    private BackgroundManager mBackgroundManager;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        Log.d(TAG, "onCreate");
        super.onActivityCreated(savedInstanceState);

        loadVideoData();

        prepareBackgroundManager();
        setupUIElements();
        setupEventListeners();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (null != mBackgroundTimer) {
            Log.d(TAG, "onDestroy: " + mBackgroundTimer.toString());
            mBackgroundTimer.cancel();
        }
    }

    private void prepareBackgroundManager() {
        mBackgroundManager = BackgroundManager.getInstance(getActivity());
        mBackgroundManager.attach(getActivity().getWindow());
        mDefaultBackground = getResources().getDrawable(R.drawable.default_background);
        mMetrics = new DisplayMetrics();
        getActivity().getWindowManager().getDefaultDisplay().getMetrics(mMetrics);
    }

    private void setupUIElements() {
        setBadgeDrawable(getActivity().getResources().getDrawable(R.drawable.videos_by_google_banner));
        setTitle(getString(R.string.browse_title)); // Badge, when set, takes precedent over title
        setHeadersState(HEADERS_ENABLED);
        setHeadersTransitionOnBackEnabled(true);
        // set fastLane (or headers) background color
        setBrandColor(getResources().getColor(R.color.fastlane_background));
        // set search icon color
        setSearchAffordanceColor(getResources().getColor(R.color.search_opaque));
    }

    private void loadVideoData() {
        VideoProvider.setContext(getActivity());
        mVideosUrl = getActivity().getResources().getString(R.string.catalog_url);
        getLoaderManager().initLoader(0, null, this);
    }

    private void setupEventListeners() {
        setOnSearchClickedListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getActivity(), SearchActivity.class);
                startActivity(intent);
            }
        });

        setOnItemViewClickedListener(new ItemViewClickedListener());
        setOnItemViewSelectedListener(new ItemViewSelectedListener());
    }

    /*
     * (non-Javadoc)
     * @see android.support.v4.app.LoaderManager.LoaderCallbacks#onCreateLoader(int,
     * android.os.Bundle)
     */
    @Override
    public Loader<HashMap<String, List<Movie>>> onCreateLoader(int arg0, Bundle arg1) {
        Log.d(TAG, "VideoItemLoader created ");
        return new VideoItemLoader(getActivity(), mVideosUrl);
    }

    /*
     * (non-Javadoc)
     * @see android.support.v4.app.LoaderManager.LoaderCallbacks#onLoadFinished(android
     * .support.v4.content.Loader, java.lang.Object)
     */
    @Override
    public void onLoadFinished(Loader<HashMap<String, List<Movie>>> arg0,
                               HashMap<String, List<Movie>> data) {

        mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
        CardPresenter cardPresenter = new CardPresenter();

        int i = 0;

        for (Map.Entry<String, List<Movie>> entry : data.entrySet()) {
            ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(cardPresenter);
            List<Movie> list = entry.getValue();

            for (int j = 0; j < list.size(); j++) {
                listRowAdapter.add(list.get(j));
            }
            HeaderItem header = new HeaderItem(i, entry.getKey());
            i++;
            mRowsAdapter.add(new ListRow(header, listRowAdapter));
        }

        HeaderItem gridHeader = new HeaderItem(i, getString(R.string.more_samples));

        GridItemPresenter gridPresenter = new GridItemPresenter(this);
        ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(gridPresenter);
        gridRowAdapter.add(getString(R.string.grid_view));
        gridRowAdapter.add(getString(R.string.error_fragment));
        gridRowAdapter.add(getString(R.string.personal_settings));
        mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));

        setAdapter(mRowsAdapter);

        updateRecommendations();
    }

    @Override
    public void onLoaderReset(Loader<HashMap<String, List<Movie>>> arg0) {
        mRowsAdapter.clear();
    }

    protected void setDefaultBackground(Drawable background) {
        mDefaultBackground = background;
    }

    protected void setDefaultBackground(int resourceId) {
        mDefaultBackground = getResources().getDrawable(resourceId);
    }

    protected void updateBackground(String uri) {
        int width = mMetrics.widthPixels;
        int height = mMetrics.heightPixels;
        Glide.with(getActivity())
                .load(uri)
                .centerCrop()
                .error(mDefaultBackground)
                .into(new SimpleTarget<GlideDrawable>(width, height) {
                    @Override
                    public void onResourceReady(GlideDrawable resource,
                                                GlideAnimation<? super GlideDrawable>
                                                        glideAnimation) {
                        mBackgroundManager.setDrawable(resource);
                    }
                });
        mBackgroundTimer.cancel();
    }

    protected void updateBackground(Drawable drawable) {
        BackgroundManager.getInstance(getActivity()).setDrawable(drawable);
    }

    protected void clearBackground() {
        BackgroundManager.getInstance(getActivity()).setDrawable(mDefaultBackground);
    }

    private void startBackgroundTimer() {
        if (null != mBackgroundTimer) {
            mBackgroundTimer.cancel();
        }
        mBackgroundTimer = new Timer();
        mBackgroundTimer.schedule(new UpdateBackgroundTask(), BACKGROUND_UPDATE_DELAY);
    }

    private void updateRecommendations() {
        Intent recommendationIntent = new Intent(getActivity(), UpdateRecommendationsService.class);
        getActivity().startService(recommendationIntent);
    }

    private class UpdateBackgroundTask extends TimerTask {

        @Override
        public void run() {
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    if (mBackgroundURI != null) {
                        updateBackground(mBackgroundURI.toString());
                    }
                }
            });
        }
    }

    private final class ItemViewClickedListener implements OnItemViewClickedListener {
        @Override
        public void onItemClicked(Presenter.ViewHolder itemViewHolder, Object item,
                                  RowPresenter.ViewHolder rowViewHolder, Row row) {

            if (item instanceof Movie) {
                Movie movie = (Movie) item;
                Log.d(TAG, "Movie: " + movie.toString());
                Intent intent = new Intent(getActivity(), MovieDetailsActivity.class);
                intent.putExtra(MovieDetailsActivity.MOVIE, movie);

                Bundle bundle = ActivityOptionsCompat.makeSceneTransitionAnimation(
                        getActivity(),
                        ((ImageCardView) itemViewHolder.view).getMainImageView(),
                        MovieDetailsActivity.SHARED_ELEMENT_NAME).toBundle();
                getActivity().startActivity(intent, bundle);
            } else if (item instanceof String) {
                if (((String) item).indexOf(getString(R.string.grid_view)) >= 0) {
                    Intent intent = new Intent(getActivity(), VerticalGridActivity.class);
                    startActivity(intent);
                } else if (((String) item).indexOf(getString(R.string.error_fragment)) >= 0) {
                    Intent intent = new Intent(getActivity(), BrowseErrorActivity.class);
                    startActivity(intent);
                } else {
                    Toast.makeText(getActivity(), ((String) item), Toast.LENGTH_SHORT)
                            .show();
                }
            }
        }
    }


    private final class ItemViewSelectedListener implements OnItemViewSelectedListener {
        @Override
        public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item,
                                   RowPresenter.ViewHolder rowViewHolder, Row row) {
            if (item instanceof Movie) {
                mBackgroundURI = ((Movie) item).getBackgroundImageURI();
                startBackgroundTimer();
            }

        }
    }
}