/*
 * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
 *
 * 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.sufficientlysecure.keychain.ui;

import java.util.Set;

import org.sufficientlysecure.keychain.Id;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.provider.KeychainContract;
import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds;
import org.sufficientlysecure.keychain.ui.adapter.KeyListSecretAdapter;
import org.sufficientlysecure.keychain.ui.dialog.DeleteKeyDialogFragment;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.AdapterView.OnItemClickListener;

import com.actionbarsherlock.app.SherlockListFragment;

public class KeyListSecretFragment extends SherlockListFragment implements
        LoaderManager.LoaderCallbacks<Cursor>, OnItemClickListener {

    private KeyListSecretActivity mKeyListSecretActivity;
    private KeyListSecretAdapter mAdapter;

    /**
     * Define Adapter and Loader on create of Activity
     */
    @SuppressLint("NewApi")
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        mKeyListSecretActivity = (KeyListSecretActivity) getActivity();

        getListView().setOnItemClickListener(this);

        // Give some text to display if there is no data. In a real
        // application this would come from a resource.
        setEmptyText(getString(R.string.list_empty));

        /*
         * ActionBarSherlock does not support MultiChoiceModeListener. Thus multi-selection is only
         * available for Android >= 3.0
         */
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
            getListView().setMultiChoiceModeListener(new MultiChoiceModeListener() {

                private int count = 0;

                @Override
                public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                    android.view.MenuInflater inflater = getActivity().getMenuInflater();
                    inflater.inflate(R.menu.key_list_secret_multi, menu);
                    return true;
                }

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

                @Override
                public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                    Set<Integer> positions = mAdapter.getCurrentCheckedPosition();

                    // get IDs for checked positions as long array
                    long[] ids = new long[positions.size()];
                    int i = 0;
                    for (int pos : positions) {
                        ids[i] = mAdapter.getItemId(pos);
                        i++;
                    }

                    switch (item.getItemId()) {
                    case R.id.menu_key_list_public_multi_delete: {
                        showDeleteKeyDialog(ids);

                        break;
                    }
                    }
                    return false;
                }

                @Override
                public void onDestroyActionMode(ActionMode mode) {
                    count = 0;
                    mAdapter.clearSelection();
                }

                @Override
                public void onItemCheckedStateChanged(ActionMode mode, int position, long id,
                        boolean checked) {
                    if (checked) {
                        count++;
                        mAdapter.setNewSelection(position, checked);
                    } else {
                        count--;
                        mAdapter.removeSelection(position);
                    }

                    String keysSelected = getResources().getQuantityString(
                            R.plurals.key_list_selected_keys, count, count);
                    mode.setTitle(keysSelected);
                }

            });
        }

        // We have a menu item to show in action bar.
        setHasOptionsMenu(true);

        // Start out with a progress indicator.
        setListShown(false);

        // Create an empty adapter we will use to display the loaded data.
        mAdapter = new KeyListSecretAdapter(mKeyListSecretActivity, null, 0);
        setListAdapter(mAdapter);

        // Prepare the loader. Either re-connect with an existing one,
        // or start a new one.
        getLoaderManager().initLoader(0, null, this);
    }

    // These are the rows that we will retrieve.
    static final String[] PROJECTION = new String[] { KeyRings._ID, KeyRings.MASTER_KEY_ID,
            UserIds.USER_ID };
    static final String SORT_ORDER = UserIds.USER_ID + " COLLATE LOCALIZED ASC";

    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        // This is called when a new Loader needs to be created. This
        // sample only has one Loader, so we don't care about the ID.
        // First, pick the base URI to use depending on whether we are
        // currently filtering.
        Uri baseUri = KeyRings.buildSecretKeyRingsUri();

        // Now create and return a CursorLoader that will take care of
        // creating a Cursor for the data being displayed.
        return new CursorLoader(getActivity(), baseUri, PROJECTION, null, null, SORT_ORDER);
    }

    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        // Swap the new cursor in. (The framework will take care of closing the
        // old cursor once we return.)
        mAdapter.swapCursor(data);

        // The list should now be shown.
        if (isResumed()) {
            setListShown(true);
        } else {
            setListShownNoAnimation(true);
        }
    }

    public void onLoaderReset(Loader<Cursor> loader) {
        // This is called when the last Cursor provided to onLoadFinished()
        // above is about to be closed. We need to make sure we are no
        // longer using it.
        mAdapter.swapCursor(null);
    }

    /**
     * On click on item, start key view activity
     */
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
        Intent editIntent = new Intent(mKeyListSecretActivity, EditKeyActivity.class);
        editIntent.setData(KeychainContract.KeyRings.buildSecretKeyRingsUri(Long.toString(id)));
        editIntent.setAction(EditKeyActivity.ACTION_EDIT_KEY);
        startActivityForResult(editIntent, 0);
    }

    /**
     * Show dialog to delete key
     * 
     * @param keyRingRowIds
     */
    public void showDeleteKeyDialog(long[] keyRingRowIds) {
        DeleteKeyDialogFragment deleteKeyDialog = DeleteKeyDialogFragment.newInstance(null,
                keyRingRowIds, Id.type.secret_key);

        deleteKeyDialog.show(getActivity().getSupportFragmentManager(), "deleteKeyDialog");
    }
}