package io.invertase.firebase.database;

/*
 * Copyright (c) 2016-present Invertase Limited & Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this library 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.
 *
 */

import com.google.firebase.FirebaseApp;
import com.google.firebase.database.DatabaseException;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Logger;
import io.invertase.firebase.common.UniversalFirebasePreferences;
import java.util.HashMap;

public class UniversalFirebaseDatabaseCommon {
  private static HashMap<String, Boolean> configSettingsLock = new HashMap<>();
  private static HashMap<String, HashMap<String, Object>> emulatorConfigs = new HashMap<>();

  static FirebaseDatabase getDatabaseForApp(String appName, String dbURL) {
    FirebaseDatabase firebaseDatabase;

    if (dbURL != null && dbURL.length() > 0) {
      if (appName != null && appName.length() > 0) {
        FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
        firebaseDatabase = FirebaseDatabase.getInstance(firebaseApp, dbURL);
      } else {
        firebaseDatabase = FirebaseDatabase.getInstance(dbURL);
      }
    } else {
      FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
      firebaseDatabase = FirebaseDatabase.getInstance(firebaseApp);
    }

    setDatabaseConfig(firebaseDatabase, appName, dbURL);

    HashMap emulatorConfig = getEmulatorConfig(appName, dbURL);

    if (emulatorConfig != null) {
      firebaseDatabase.useEmulator(
          (String) emulatorConfig.get("host"), (Integer) emulatorConfig.get("port"));
    }

    return firebaseDatabase;
  }

  private static void setDatabaseConfig(
      FirebaseDatabase firebaseDatabase, String appName, String dbURL) {
    String lockKey = appName + dbURL;
    if (configSettingsLock.containsKey(lockKey)) return;

    UniversalFirebasePreferences preferences = UniversalFirebasePreferences.getSharedInstance();

    try {
      boolean persistenceEnabled =
          preferences.getBooleanValue(UniversalDatabaseStatics.DATABASE_PERSISTENCE_ENABLED, false);
      firebaseDatabase.setPersistenceEnabled(persistenceEnabled);

      boolean loggingEnabled =
          preferences.getBooleanValue(UniversalDatabaseStatics.DATABASE_LOGGING_ENABLED, false);

      if (loggingEnabled) {
        firebaseDatabase.setLogLevel(Logger.Level.DEBUG);
      } else {
        firebaseDatabase.setLogLevel(Logger.Level.WARN);
      }

      if (preferences.contains(UniversalDatabaseStatics.DATABASE_PERSISTENCE_CACHE_SIZE)) {
        firebaseDatabase.setPersistenceCacheSizeBytes(
            preferences.getLongValue(
                UniversalDatabaseStatics.DATABASE_PERSISTENCE_CACHE_SIZE, 10485760L));
      }
    } catch (DatabaseException exception) {
      if (!exception
          .getMessage()
          .contains("must be made before any other usage of FirebaseDatabase")) {
        throw exception;
      }
    }

    configSettingsLock.put(lockKey, true);
  }

  static void addEmulatorConfig(String appName, String dbURL, String host, int port) {
    String configKey = appName + dbURL;
    HashMap<String, Object> emulatorConfig = new HashMap<>();
    emulatorConfig.put("host", host);
    emulatorConfig.put("port", Integer.valueOf(port));
    emulatorConfigs.put(configKey, emulatorConfig);
  }

  private static HashMap<String, Object> getEmulatorConfig(String appName, String dbURL) {
    return emulatorConfigs.get(appName + dbURL);
  }
}