/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.search;

import org.mozilla.gecko.GeckoSharedPrefs;
import org.mozilla.gecko.Locales;
import org.mozilla.gecko.R;
import org.mozilla.gecko.Telemetry;
import org.mozilla.gecko.TelemetryContract;
import org.mozilla.gecko.db.BrowserContract;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.util.Log;
import android.view.MenuItem;
import android.widget.Toast;

/**
 * This activity allows users to modify the settings for the search activity.
 *
 * A note on implementation: At the moment, we don't have tablet-specific designs.
 * Therefore, this implementation uses the old-style PreferenceActivity. When
 * we start optimizing for tablets, we can migrate to Fennec's PreferenceFragment
 * implementation.
 *
 * TODO: Change this to PreferenceFragment when we stop supporting devices older than SDK 11.
 */
public class SearchPreferenceActivity extends PreferenceActivity {

    private static final String LOG_TAG = "SearchPreferenceActivity";

    public static final String PREF_CLEAR_HISTORY_KEY = "search.not_a_preference.clear_history";

    @Override
    @SuppressWarnings("deprecation")
    protected void onCreate(Bundle savedInstanceState) {
        Locales.initializeLocale(getApplicationContext());
        super.onCreate(savedInstanceState);

        getPreferenceManager().setSharedPreferencesName(GeckoSharedPrefs.APP_PREFS_NAME);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            if (getActionBar() != null) {
                getActionBar().setDisplayHomeAsUpEnabled(true);
            }
        }
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        setupPrefsScreen();
    }

    @SuppressWarnings("deprecation")
    private void setupPrefsScreen() {
        addPreferencesFromResource(R.xml.search_preferences);

        // Attach click listener to clear history button.
        final Preference clearHistoryButton = findPreference(PREF_CLEAR_HISTORY_KEY);
        clearHistoryButton.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
            @Override
            public boolean onPreferenceClick(Preference preference) {
                final AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(SearchPreferenceActivity.this);
                dialogBuilder.setNegativeButton(android.R.string.cancel, null);
                dialogBuilder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Telemetry.sendUIEvent(TelemetryContract.Event.SANITIZE, TelemetryContract.Method.MENU, "search-history");
                        clearHistory();
                    }
                });
                dialogBuilder.setMessage(R.string.pref_clearHistory_dialogMessage);
                dialogBuilder.show();
                return false;
            }
        });
    }

    private void clearHistory() {
        final AsyncTask<Void, Void, Boolean> clearHistoryTask = new AsyncTask<Void, Void, Boolean>() {
            @Override
            protected Boolean doInBackground(Void... params) {
                final int numDeleted = getContentResolver().delete(
                        BrowserContract.SearchHistory.CONTENT_URI, null, null);
                return numDeleted >= 0;
            }

            @Override
            protected void onPostExecute(Boolean success) {
                if (success) {
                    getContentResolver().notifyChange(BrowserContract.SearchHistory.CONTENT_URI, null);
                    Toast.makeText(SearchPreferenceActivity.this, SearchPreferenceActivity.this.getResources()
                            .getString(R.string.pref_clearHistory_confirmation), Toast.LENGTH_SHORT).show();
                } else {
                    Log.e(LOG_TAG, "Error clearing search history.");
                }
            }
        };
        clearHistoryTask.execute();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            finish();
            return true;
        }
        return false;
    }
}
