/*
 * 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.server.utils;

import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.util.Log;

public class AppInstallerUtil {
    private static final String LOG_TAG = "AppInstallerUtil";

    private static Intent resolveIntent(Context context, Intent i) {
        ResolveInfo result = context.getPackageManager().resolveActivity(i, 0);
        return result != null ? new Intent(i.getAction())
                .setClassName(result.activityInfo.packageName, result.activityInfo.name) : null;
    }

    /**
     * Returns the package name of the app which installed a given packageName, if available.
     */
    public static String getInstallerPackageName(Context context, String packageName) {
        String installerPackageName = null;
        try {
            installerPackageName =
                    context.getPackageManager().getInstallerPackageName(packageName);
        } catch (IllegalArgumentException e) {
            Log.e(LOG_TAG, "Exception while retrieving the package installer of " + packageName, e);
        }
        if (installerPackageName == null) {
            return null;
        }
        return installerPackageName;
    }

    /**
     * Returns an intent to launcher the installer for a given package name.
     */
    public static Intent createIntent(Context context, String installerPackageName,
            String packageName) {
        Intent intent = new Intent(Intent.ACTION_SHOW_APP_INFO).setPackage(installerPackageName);
        final Intent result = resolveIntent(context, intent);
        if (result != null) {
            result.putExtra(Intent.EXTRA_PACKAGE_NAME, packageName);
            result.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            return result;
        }
        return null;
    }

    /**
     * Convenience method that looks up the installerPackageName.
     */
    public static Intent createIntent(Context context, String packageName) {
        String installerPackageName = getInstallerPackageName(context, packageName);
        return createIntent(context, installerPackageName, packageName);
    }
}