/*
 * Copyright (C) 2017 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.settings.search;

import android.content.ComponentName;
import android.content.Context;
import android.text.TextUtils;
import android.util.Log;

import com.android.internal.annotations.VisibleForTesting;
import com.android.settings.dashboard.SiteMapManager;
import com.android.settings.overlay.FeatureFactory;
import com.android.settings.search.indexing.IndexData;
import com.android.settingslib.wrapper.PackageManagerWrapper;

import java.util.Locale;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * FeatureProvider for the refactored search code.
 */
public class SearchFeatureProviderImpl implements SearchFeatureProvider {

    private static final String TAG = "SearchFeatureProvider";

    private static final String METRICS_ACTION_SETTINGS_INDEX = "search_synchronous_indexing";

    private DatabaseIndexingManager mDatabaseIndexingManager;
    private SiteMapManager mSiteMapManager;
    private ExecutorService mExecutorService;

    @Override
    public boolean isEnabled(Context context) {
        return true;
    }

    @Override
    public void verifyLaunchSearchResultPageCaller(Context context, ComponentName caller) {
        if (caller == null) {
            throw new IllegalArgumentException("ExternalSettingsTrampoline intents "
                    + "must be called with startActivityForResult");
        }
        final String packageName = caller.getPackageName();
        if (!TextUtils.equals(packageName, context.getPackageName())) {
            throw new SecurityException("Only Settings app can launch search result page");
        }
    }

    @Override
    public SearchResultLoader getSearchResultLoader(Context context, String query) {
        return new SearchResultLoader(context, cleanQuery(query));
    }

    @Override
    public DatabaseResultLoader getStaticSearchResultTask(Context context, String query) {
        return new DatabaseResultLoader(context, cleanQuery(query), getSiteMapManager());
    }

    @Override
    public InstalledAppResultLoader getInstalledAppSearchTask(Context context, String query) {
        return new InstalledAppResultLoader(
                context, new PackageManagerWrapper(context.getPackageManager()),
                cleanQuery(query), getSiteMapManager());
    }

    @Override
    public AccessibilityServiceResultLoader getAccessibilityServiceResultTask(Context context,
            String query) {
        return new AccessibilityServiceResultLoader(context, cleanQuery(query),
                getSiteMapManager());
    }

    @Override
    public InputDeviceResultLoader getInputDeviceResultTask(Context context, String query) {
        return new InputDeviceResultLoader(context, cleanQuery(query), getSiteMapManager());
    }

    @Override
    public SavedQueryLoader getSavedQueryLoader(Context context) {
        return new SavedQueryLoader(context);
    }

    @Override
    public DatabaseIndexingManager getIndexingManager(Context context) {
        if (mDatabaseIndexingManager == null) {
            mDatabaseIndexingManager = new DatabaseIndexingManager(context.getApplicationContext());
        }
        return mDatabaseIndexingManager;
    }

    @Override
    public boolean isIndexingComplete(Context context) {
        return getIndexingManager(context).isIndexingComplete();
    }

    public SiteMapManager getSiteMapManager() {
        if (mSiteMapManager == null) {
            mSiteMapManager = new SiteMapManager();
        }
        return mSiteMapManager;
    }

    @Override
    public void updateIndexAsync(Context context, IndexingCallback callback) {
        if (SettingsSearchIndexablesProvider.DEBUG) {
            Log.d(TAG, "updating index async");
        }
        getIndexingManager(context).indexDatabase(callback);
    }

    @Override
    public void updateIndex(Context context) {
        long indexStartTime = System.currentTimeMillis();
        getIndexingManager(context).performIndexing();
        int indexingTime = (int) (System.currentTimeMillis() - indexStartTime);
        FeatureFactory.getFactory(context).getMetricsFeatureProvider()
                .histogram(context, METRICS_ACTION_SETTINGS_INDEX, indexingTime);
    }

    @Override
    public ExecutorService getExecutorService() {
        if (mExecutorService == null) {
            mExecutorService = Executors.newCachedThreadPool();
        }
        return mExecutorService;
    }

    /**
     * A generic method to make the query suitable for searching the database.
     *
     * @return the cleaned query string
     */
    @VisibleForTesting
    String cleanQuery(String query) {
        if (TextUtils.isEmpty(query)) {
            return null;
        }
        if (Locale.getDefault().equals(Locale.JAPAN)) {
            query = IndexData.normalizeJapaneseString(query);
        }
        return query.trim();
    }
}