/*
  This file is part of Subsonic.
    Subsonic is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    Subsonic is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
    Copyright 2014 (C) Scott Jackson
*/

package net.nullsum.audinaut.fragments;

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import net.nullsum.audinaut.R;
import net.nullsum.audinaut.adapter.DownloadFileAdapter;
import net.nullsum.audinaut.adapter.SectionAdapter;
import net.nullsum.audinaut.domain.MusicDirectory;
import net.nullsum.audinaut.service.DownloadFile;
import net.nullsum.audinaut.service.DownloadService;
import net.nullsum.audinaut.service.MusicService;
import net.nullsum.audinaut.util.DownloadFileItemHelperCallback;
import net.nullsum.audinaut.util.ProgressListener;
import net.nullsum.audinaut.util.SilentBackgroundTask;
import net.nullsum.audinaut.util.Util;
import net.nullsum.audinaut.view.UpdateView;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class DownloadFragment extends SelectRecyclerFragment<DownloadFile> implements SectionAdapter.OnItemClickedListener<DownloadFile> {
    private long currentRevision;
    private ScheduledExecutorService executorService;

    public DownloadFragment() {
        serialize = false;
        pullToRefresh = false;
    }

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

        ItemTouchHelper touchHelper = new ItemTouchHelper(new DownloadFileItemHelperCallback(this, false));
        touchHelper.attachToRecyclerView(recyclerView);

        return rootView;
    }

    @Override
    public void onResume() {
        super.onResume();

        final Handler handler = new Handler();
        Runnable runnable = () -> handler.post(this::update);

        executorService = Executors.newSingleThreadScheduledExecutor();
        executorService.scheduleWithFixedDelay(runnable, 0L, 1000L, TimeUnit.MILLISECONDS);
    }

    @Override
    public void onPause() {
        super.onPause();
        executorService.shutdown();
    }

    @Override
    public int getOptionsMenu() {
        return R.menu.downloading;
    }

    @Override
    public SectionAdapter getAdapter(List<DownloadFile> objs) {
        return new DownloadFileAdapter(context, objs, this);
    }

    @Override
    public List<DownloadFile> getObjects(MusicService musicService, boolean refresh, ProgressListener listener) throws Exception {
        DownloadService downloadService = getDownloadService();
        if (downloadService == null) {
            return new ArrayList<>();
        }

        List<DownloadFile> songList = new ArrayList<>();
        songList.addAll(downloadService.getBackgroundDownloads());
        currentRevision = downloadService.getDownloadListUpdateRevision();
        return songList;
    }

    @Override
    public int getTitleResource() {
        return R.string.button_bar_downloading;
    }

    @Override
    public void onItemClicked(UpdateView<DownloadFile> updateView, DownloadFile item) {

    }

    @Override
    public void onCreateContextMenu(Menu menu, MenuInflater menuInflater, UpdateView<DownloadFile> updateView, DownloadFile downloadFile) {
        MusicDirectory.Entry selectedItem = downloadFile.getSong();
        onCreateContextMenuSupport(menu, menuInflater, updateView, selectedItem);
        if (!Util.isOffline(context)) {
            menu.removeItem(R.id.song_menu_remove_playlist);
        }

        recreateContextMenu(menu);
    }

    @Override
    public boolean onContextItemSelected(MenuItem menuItem, UpdateView<DownloadFile> updateView, DownloadFile downloadFile) {
        MusicDirectory.Entry selectedItem = downloadFile.getSong();
        return onContextItemSelected(menuItem, selectedItem);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem menuItem) {
        if (super.onOptionsItemSelected(menuItem)) {
            return true;
        }

        switch (menuItem.getItemId()) {
            case R.id.menu_remove_all:
                Util.confirmDialog(context, R.string.download_menu_remove_all, "", (dialog, which) -> new SilentBackgroundTask<Void>(context) {
                    @Override
                    protected Void doInBackground() throws Throwable {
                        getDownloadService().clearBackground();
                        return null;
                    }

                    @Override
                    protected void done(Void result) {
                        update();
                    }
                }.execute());
                return true;
        }

        return false;
    }

    private void update() {
        DownloadService downloadService = getDownloadService();
        if (downloadService == null || objects == null || adapter == null) {
            return;
        }

        if (currentRevision != downloadService.getDownloadListUpdateRevision()) {
            List<DownloadFile> downloadFileList = downloadService.getBackgroundDownloads();
            objects.clear();
            objects.addAll(downloadFileList);
            adapter.notifyDataSetChanged();

            currentRevision = downloadService.getDownloadListUpdateRevision();
        }
    }
}