/*
 * 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.leanback;

import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v17.leanback.app.GuidedStepFragment;
import android.support.v17.leanback.app.RowsFragment;
import android.support.v17.leanback.app.RowsFragmentAdapter;
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.ObjectAdapter;
import android.support.v17.leanback.widget.OnItemViewClickedListener;
import android.support.v17.leanback.widget.OnItemViewSelectedListener;
import android.support.v17.leanback.widget.PageRow;
import android.support.v17.leanback.widget.PageRowPresenter;
import android.support.v17.leanback.widget.Presenter;
import android.support.v17.leanback.widget.PresenterSelector;
import android.support.v17.leanback.widget.Row;
import android.support.v17.leanback.widget.RowPresenter;
import android.support.v4.app.ActivityOptionsCompat;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class BrowseFragment extends android.support.v17.leanback.app.BrowseFragment {
    private static final String TAG = "leanback.BrowseFragment";

    private static final boolean TEST_ENTRANCE_TRANSITION = true;
    private static final int NUM_ROWS = 4;

    private ArrayObjectAdapter mRowsAdapter;
    private BackgroundHelper mBackgroundHelper = new BackgroundHelper();

    // For good performance, it's important to use a single instance of
    // a card presenter for all rows using that presenter.
    final CardPresenter mCardPresenter = new CardPresenter();
    final CardPresenter mCardPresenter2 = new CardPresenter(R.style.MyImageCardViewTheme);

    public BrowseFragment() {
        setMainFragmentAdapterFactory(new MainFragmentFactorAdapterImpl());
    }

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

        setBadgeDrawable(getActivity().getResources().getDrawable(R.drawable.ic_title));
        setTitle("Leanback Sample App");
        setHeadersState(HEADERS_ENABLED);

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

        setupRows();
        setOnItemViewClickedListener(new ItemViewClickedListener());
        setOnItemViewSelectedListener(new OnItemViewSelectedListener() {
            @Override
            public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item,
                    RowPresenter.ViewHolder rowViewHolder, Row row) {
                Log.i(TAG, "onItemSelected: " + item + " row " + row);

                if (isShowingHeaders()) {
                    mBackgroundHelper.setBackground(getActivity(), null);
                } else if (item instanceof PhotoItem) {
                    mBackgroundHelper.setBackground(
                            getActivity(), ((PhotoItem) item).getImageResourceId());
                }
            }
        });
        if (TEST_ENTRANCE_TRANSITION) {
            // don't run entrance transition if fragment is restored.
            if (savedInstanceState == null) {
                prepareEntranceTransition();
            }
        }
        // simulates in a real world use case  data being loaded two seconds later
        new Handler().postDelayed(new Runnable() {
            public void run() {
                loadData();
                startEntranceTransition();
            }
        }, 2000);
    }

    @Override
    public View onCreateView(
            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return super.onCreateView(inflater, container, savedInstanceState);
    }

    private void setupRows() {
        mRowsAdapter = new ArrayObjectAdapter(new MyPresenterSelector());
        setAdapter(mRowsAdapter);
    }

    private void loadData() {
        int i = 0;
        for (; i < NUM_ROWS; ++i) {
            HeaderItem header = new HeaderItem(i, "Row " + i);
            mRowsAdapter.add(new ListRow(header, createListRowAdapter(i)));
        }

        HeaderItem header = new HeaderItem(NUM_ROWS, "Page Row " + 0);
        mRowsAdapter.add(new PageRow(header));

        header = new HeaderItem(NUM_ROWS, "Page Row " + 1);
        mRowsAdapter.add(new PageRow(header));
    }

    private ArrayObjectAdapter createListRowAdapter(int i) {
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter((i & 1) == 0 ?
                mCardPresenter : mCardPresenter2);
        listRowAdapter.add(new PhotoItem(
                "Hello world",
                R.drawable.gallery_photo_1));
        listRowAdapter.add(new PhotoItem(
                "This is a test",
                "Only a test",
                R.drawable.gallery_photo_2));
        listRowAdapter.add(new PhotoItem(
                "Android TV",
                "by Google",
                R.drawable.gallery_photo_3));
        listRowAdapter.add(new PhotoItem(
                "Leanback",
                R.drawable.gallery_photo_4));
        listRowAdapter.add(new PhotoItem(
                "GuidedStep (Slide left/right)",
                R.drawable.gallery_photo_5));
        listRowAdapter.add(new PhotoItem(
                "GuidedStep (Slide bottom up)",
                "Open GuidedStepFragment",
                R.drawable.gallery_photo_6));
        listRowAdapter.add(new PhotoItem(
                "Android TV",
                "open RowsActivity",
                R.drawable.gallery_photo_7));
        listRowAdapter.add(new PhotoItem(
                "Leanback",
                "open BrowseActivity",
                R.drawable.gallery_photo_8));
        return listRowAdapter;
    }

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

            Intent intent;
            Bundle bundle;
            if (((PhotoItem) item).getImageResourceId() == R.drawable.gallery_photo_6) {
                GuidedStepFragment.add(getFragmentManager(),
                        new GuidedStepHalfScreenActivity.FirstStepFragment(),
                        R.id.lb_guidedstep_host);
                return;
            } else if (((PhotoItem) item).getImageResourceId() == R.drawable.gallery_photo_5) {
                GuidedStepFragment.add(getFragmentManager(),
                        new GuidedStepActivity.FirstStepFragment(), R.id.lb_guidedstep_host);
                return;
            } else if (((PhotoItem) item).getImageResourceId() == R.drawable.gallery_photo_8) {
                intent = new Intent(getActivity(), BrowseActivity.class);
                bundle = ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity())
                        .toBundle();
            } else if (((PhotoItem) item).getImageResourceId() == R.drawable.gallery_photo_7) {
                intent = new Intent(getActivity(), RowsActivity.class);
                bundle = ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity())
                        .toBundle();
            } else {
                intent = new Intent(getActivity(), DetailsActivity.class);
                intent.putExtra(DetailsActivity.EXTRA_ITEM, (PhotoItem) item);
                bundle = ActivityOptionsCompat.makeSceneTransitionAnimation(
                        getActivity(),
                        ((ImageCardView) itemViewHolder.view).getMainImageView(),
                        DetailsActivity.SHARED_ELEMENT_NAME).toBundle();
            }
            getActivity().startActivity(intent, bundle);
        }
    }

    private static class MainFragmentFactorAdapterImpl extends MainFragmentAdapterFactory {
        private AbstractMainFragmentAdapter pageFragmentAdapter1 = new PageFragmentAdapterImpl();
        private RowsFragmentAdapter gridPageFragmentAdapter;

        @Override
        public AbstractMainFragmentAdapter getPageFragmentAdapter(
                ObjectAdapter adapter, int position) {
            if (position == 4) {
                return pageFragmentAdapter1;
            } else {
                if (gridPageFragmentAdapter == null) {
                    gridPageFragmentAdapter = new GridPageFragmentAdapterImpl();
                }
                return gridPageFragmentAdapter;
            }
        }
    }

    private static class PageFragmentAdapterImpl extends AbstractMainFragmentAdapter {
        private Fragment mFragment;

        PageFragmentAdapterImpl() {
            setScalingEnabled(true);
        }

        @Override
        public Fragment getFragment() {
            if (mFragment == null) {
                mFragment = new SampleFragment();
            }
            return mFragment;
        }
    }

    private static class GridPageFragmentAdapterImpl extends RowsFragmentAdapter {
        final CardPresenter mCardPresenter = new CardPresenter();
        final CardPresenter mCardPresenter2 = new CardPresenter(R.style.MyImageCardViewTheme);
        private RowsFragment mFragment;

        GridPageFragmentAdapterImpl() {
            setScalingEnabled(true);
        }

        protected Fragment createFragment() {
            if (mFragment == null) {
                mFragment = new RowsFragment();
                ArrayObjectAdapter adapter = new ArrayObjectAdapter(new ListRowPresenter());
                for (int i = 0; i < 4; i++) {
                    ListRow row = new ListRow(new HeaderItem("Row " + i), createListRowAdapter(i));
                    adapter.add(row);
                }
                mFragment.setAdapter(adapter);
            }
            return mFragment;
        }

        private ArrayObjectAdapter createListRowAdapter(int i) {
            ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter((i & 1) == 0 ?
                    mCardPresenter : mCardPresenter2);
            listRowAdapter.add(new PhotoItem(
                    "Hello world",
                    R.drawable.gallery_photo_1));
            listRowAdapter.add(new PhotoItem(
                    "This is a test",
                    "Only a test",
                    R.drawable.gallery_photo_2));
            listRowAdapter.add(new PhotoItem(
                    "Android TV",
                    "by Google",
                    R.drawable.gallery_photo_3));
            listRowAdapter.add(new PhotoItem(
                    "Leanback",
                    R.drawable.gallery_photo_4));
            listRowAdapter.add(new PhotoItem(
                    "GuidedStep (Slide left/right)",
                    R.drawable.gallery_photo_5));
            listRowAdapter.add(new PhotoItem(
                    "GuidedStep (Slide bottom up)",
                    "Open GuidedStepFragment",
                    R.drawable.gallery_photo_6));
            listRowAdapter.add(new PhotoItem(
                    "Android TV",
                    "open RowsActivity",
                    R.drawable.gallery_photo_7));
            listRowAdapter.add(new PhotoItem(
                    "Leanback",
                    "open BrowseActivity",
                    R.drawable.gallery_photo_8));
            return listRowAdapter;
        }
    }

    private static class SampleFragment extends Fragment {

        @Override
        public View onCreateView(
                LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.page_fragment, container, false);
        }
    }

    private static class MyPresenterSelector extends PresenterSelector {
        private Presenter[] presenters = {
                new ListRowPresenter(),
                new PageRowPresenter()
        };

        @Override
        public Presenter getPresenter(Object item) {
            if (item instanceof PageRow) {
                return presenters[1];
            }
            return presenters[0];
        }

        @Override
        public Presenter[] getPresenters() {
            return presenters;
        }
    }
}