/*
 * Copyright (C) 2010 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.android.browser.preferences;

import com.android.browser.BrowserActivity;
import com.android.browser.BrowserSettings;
import com.android.browser.PreferenceKeys;
import com.android.browser.R;
import com.android.browser.search.SearchEngine;

import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceFragment;
import android.view.LayoutInflater;
import android.view.View;

public class LabPreferencesFragment extends PreferenceFragment
        implements OnPreferenceChangeListener {
    private BrowserSettings mBrowserSettings;
    private Preference useInstantPref;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mBrowserSettings = BrowserSettings.getInstance();

        // Load the XML preferences file
        addPreferencesFromResource(R.xml.lab_preferences);
        registerChangeListener(PreferenceKeys.PREF_ENABLE_QUICK_CONTROLS);
        registerChangeListener(PreferenceKeys.PREF_ENABLE_USERAGENT_SWITCHER);
        useInstantPref = findPreference(PreferenceKeys.PREF_USE_INSTANT_SEARCH);
    }

    private void registerChangeListener(String key) {
        Preference e = findPreference(key);
        if (e != null) {
            e.setOnPreferenceChangeListener(this);
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        if (useInstantPref != null) {
            useInstantPref.setEnabled(false);

            // Enable the "use instant" preference only if the selected
            // search engine is google.
            if (mBrowserSettings.getSearchEngine() != null) {
                final String currentName = mBrowserSettings.getSearchEngine().getName();
                if (SearchEngine.GOOGLE.equals(currentName)) {
                    useInstantPref.setEnabled(true);
                }
            }
        }
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        String key = preference.getKey();
        if (PreferenceKeys.PREF_ENABLE_QUICK_CONTROLS.equals(key)) {
            // Attempt to restart
            startActivity(new Intent(BrowserActivity.ACTION_RESTART, null,
                    getActivity(), BrowserActivity.class));
        }
        if (PreferenceKeys.PREF_ENABLE_USERAGENT_SWITCHER.equals(key)) {
            if ((Boolean)newValue) {
                // Show the help
                LayoutInflater inflater = LayoutInflater.from(getActivity());
                View content = inflater.inflate(R.layout.help_dialog_useragent_switcher, null);
                new AlertDialog.Builder(getActivity())
                        .setView(content)
                        .setNeutralButton(android.R.string.ok, null)
                        .show();
            }
        }
        return true;
    }
}