// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package io.flutter.plugins.packageinfo;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.plugin.common.BinaryMessenger;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
import io.flutter.plugin.common.MethodChannel.Result;
import io.flutter.plugin.common.PluginRegistry.Registrar;
import java.util.HashMap;
import java.util.Map;

/** PackageInfoPlugin */
public class PackageInfoPlugin implements MethodCallHandler, FlutterPlugin {
  private Context applicationContext;
  private MethodChannel methodChannel;

  /** Plugin registration. */
  public static void registerWith(Registrar registrar) {
    final PackageInfoPlugin instance = new PackageInfoPlugin();
    instance.onAttachedToEngine(registrar.context(), registrar.messenger());
  }

  @Override
  public void onAttachedToEngine(FlutterPluginBinding binding) {
    onAttachedToEngine(
        binding.getApplicationContext(), binding.getFlutterEngine().getDartExecutor());
  }

  private void onAttachedToEngine(Context applicationContext, BinaryMessenger messenger) {
    this.applicationContext = applicationContext;
    methodChannel = new MethodChannel(messenger, "plugins.flutter.io/package_info");
    methodChannel.setMethodCallHandler(this);
  }

  @Override
  public void onDetachedFromEngine(FlutterPluginBinding binding) {
    applicationContext = null;
    methodChannel.setMethodCallHandler(null);
    methodChannel = null;
  }

  @Override
  public void onMethodCall(MethodCall call, Result result) {
    try {
      if (call.method.equals("getAll")) {
        PackageManager pm = applicationContext.getPackageManager();
        PackageInfo info = pm.getPackageInfo(applicationContext.getPackageName(), 0);

        Map<String, String> map = new HashMap<>();
        map.put("appName", info.applicationInfo.loadLabel(pm).toString());
        map.put("packageName", applicationContext.getPackageName());
        map.put("version", info.versionName);
        map.put("buildNumber", String.valueOf(getLongVersionCode(info)));

        result.success(map);
      } else {
        result.notImplemented();
      }
    } catch (PackageManager.NameNotFoundException ex) {
      result.error("Name not found", ex.getMessage(), null);
    }
  }

  @SuppressWarnings("deprecation")
  private static long getLongVersionCode(PackageInfo info) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
      return info.getLongVersionCode();
    }
    return info.versionCode;
  }
}