/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.view.ActionMode;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.RecyclerListener;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;

import com.afollestad.materialdialogs.AlertDialogWrapper;
import com.melnykov.fab.FloatingActionButton;

import org.thoughtcrime.securesms.ConversationListAdapter.ItemClickListener;
import org.thoughtcrime.securesms.components.DefaultSmsReminder;
import org.thoughtcrime.securesms.components.DividerItemDecoration;
import org.thoughtcrime.securesms.components.ExpiredBuildReminder;
import org.thoughtcrime.securesms.components.PushRegistrationReminder;
import org.thoughtcrime.securesms.components.ReminderView;
import org.thoughtcrime.securesms.components.SystemSmsImportReminder;
import org.thoughtcrime.securesms.crypto.MasterSecret;
import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.database.loaders.ConversationListLoader;
import org.thoughtcrime.securesms.notifications.MessageNotifier;
import org.thoughtcrime.securesms.recipients.Recipients;

import java.util.Set;


public class ConversationListFragment extends Fragment
  implements LoaderManager.LoaderCallbacks<Cursor>, ActionMode.Callback, ItemClickListener
{

  private MasterSecret         masterSecret;
  private ActionMode           actionMode;
  private RecyclerView         list;
  private ReminderView         reminderView;
  private FloatingActionButton fab;
  private String               queryFilter  = "";

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    masterSecret = getArguments().getParcelable("master_secret");
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle) {
    final View view = inflater.inflate(R.layout.conversation_list_fragment, container, false);
    reminderView = (ReminderView) view.findViewById(R.id.reminder);
    list         = (RecyclerView) view.findViewById(R.id.list);
    fab          = (FloatingActionButton) view.findViewById(R.id.fab);
    list.setHasFixedSize(true);
    list.setLayoutManager(new LinearLayoutManager(getActivity()));
    list.addItemDecoration(new DividerItemDecoration(getActivity(), LinearLayoutManager.VERTICAL, R.attr.conversation_list_item_divider));
    return view;
  }

  @Override
  public void onActivityCreated(Bundle bundle) {
    super.onActivityCreated(bundle);

    setHasOptionsMenu(true);
    fab.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        startActivity(new Intent(getActivity(), NewConversationActivity.class));
      }
    });
    initializeListAdapter();
  }

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

    initializeReminders();
    list.getAdapter().notifyDataSetChanged();
  }

  public ConversationListAdapter getListAdapter() {
    return (ConversationListAdapter) list.getAdapter();
  }

  public void setQueryFilter(String query) {
    this.queryFilter = query;
    getLoaderManager().restartLoader(0, null, this);
  }

  public void resetQueryFilter() {
    if (!TextUtils.isEmpty(this.queryFilter)) {
      setQueryFilter("");
    }
  }

  private void initializeReminders() {
    if (ExpiredBuildReminder.isEligible(getActivity())) {
      reminderView.showReminder(new ExpiredBuildReminder());
    } else if (DefaultSmsReminder.isEligible(getActivity())) {
      reminderView.showReminder(new DefaultSmsReminder(getActivity()));
    } else if (SystemSmsImportReminder.isEligible(getActivity())) {
      reminderView.showReminder(new SystemSmsImportReminder(getActivity(), masterSecret));
    } else if (PushRegistrationReminder.isEligible(getActivity())) {
      reminderView.showReminder(new PushRegistrationReminder(getActivity(), masterSecret));
    } else {
      reminderView.hide();
    }
  }

  private void initializeListAdapter() {
    list.setAdapter(new ConversationListAdapter(getActivity(), masterSecret, null, this));
    list.setRecyclerListener(new RecyclerListener() {
      @Override
      public void onViewRecycled(ViewHolder holder) {
        ((ConversationListItem)holder.itemView).unbind();
      }
    });
    getLoaderManager().restartLoader(0, null, this);
  }

  private void handleDeleteAllSelected() {
    AlertDialogWrapper.Builder alert = new AlertDialogWrapper.Builder(getActivity());
    alert.setIconAttribute(R.attr.dialog_alert_icon);
    alert.setTitle(R.string.ConversationListFragment_delete_threads_question);
    alert.setMessage(R.string.ConversationListFragment_are_you_sure_you_wish_to_delete_all_selected_conversation_threads);
    alert.setCancelable(true);

    alert.setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        final Set<Long> selectedConversations = (getListAdapter())
            .getBatchSelections();

        if (!selectedConversations.isEmpty()) {
          new AsyncTask<Void, Void, Void>() {
            private ProgressDialog dialog;

            @Override
            protected void onPreExecute() {
              dialog = ProgressDialog.show(getActivity(),
                                           getActivity().getString(R.string.ConversationListFragment_deleting),
                                           getActivity().getString(R.string.ConversationListFragment_deleting_selected_threads),
                                           true, false);
            }

            @Override
            protected Void doInBackground(Void... params) {
              DatabaseFactory.getThreadDatabase(getActivity()).deleteConversations(selectedConversations);
              MessageNotifier.updateNotification(getActivity(), masterSecret);
              return null;
            }

            @Override
            protected void onPostExecute(Void result) {
              dialog.dismiss();
              if (actionMode != null) {
                actionMode.finish();
                actionMode = null;
              }
            }
          }.execute();
        }
      }
    });

    alert.setNegativeButton(android.R.string.cancel, null);
    alert.show();
  }

  private void handleSelectAllThreads() {
    getListAdapter().selectAllThreads();
    actionMode.setSubtitle(getString(R.string.conversation_fragment_cab__batch_selection_amount,
                           ((ConversationListAdapter)this.getListAdapter()).getBatchSelections().size()));
  }

  private void handleCreateConversation(long threadId, Recipients recipients, int distributionType) {
    ((ConversationSelectedListener)getActivity()).onCreateConversation(threadId, recipients, distributionType);
  }

  @Override
  public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
    return new ConversationListLoader(getActivity(), queryFilter);
  }

  @Override
  public void onLoadFinished(Loader<Cursor> arg0, Cursor cursor) {
    getListAdapter().changeCursor(cursor);
  }

  @Override
  public void onLoaderReset(Loader<Cursor> arg0) {
    getListAdapter().changeCursor(null);
  }

  @Override
  public void onItemClick(ConversationListItem item) {
    if (actionMode == null) {
      handleCreateConversation(item.getThreadId(), item.getRecipients(),
                               item.getDistributionType());
    } else {
      ConversationListAdapter adapter = (ConversationListAdapter)list.getAdapter();
      adapter.toggleThreadInBatchSet(item.getThreadId());

      if (adapter.getBatchSelections().size() == 0) {
        actionMode.finish();
      } else {
        actionMode.setSubtitle(getString(R.string.conversation_fragment_cab__batch_selection_amount,
                                         adapter.getBatchSelections().size()));
      }

      adapter.notifyDataSetChanged();
    }
  }

  @Override
  public void onItemLongClick(ConversationListItem item) {
    actionMode = ((ActionBarActivity)getActivity()).startSupportActionMode(ConversationListFragment.this);

    getListAdapter().initializeBatchMode(true);
    getListAdapter().toggleThreadInBatchSet(item.getThreadId());
    getListAdapter().notifyDataSetChanged();
  }

  public interface ConversationSelectedListener {
    void onCreateConversation(long threadId, Recipients recipients, int distributionType);
}

  @Override
  public boolean onCreateActionMode(ActionMode mode, Menu menu) {
    MenuInflater inflater = getActivity().getMenuInflater();
    inflater.inflate(R.menu.conversation_list_batch, menu);

    mode.setTitle(R.string.conversation_fragment_cab__batch_selection_mode);
    mode.setSubtitle(null);

    return true;
  }

  @Override
  public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
    return false;
  }

  @Override
  public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
    switch (item.getItemId()) {
    case R.id.menu_select_all:      handleSelectAllThreads(); return true;
    case R.id.menu_delete_selected: handleDeleteAllSelected(); return true;
    }

    return false;
  }

  @Override
  public void onDestroyActionMode(ActionMode mode) {
    getListAdapter().initializeBatchMode(false);
    actionMode = null;
  }

}