// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you 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 org.openqa.selenium.grid.config;

import com.google.common.collect.ImmutableList;
import org.openqa.selenium.json.Json;

import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Logger;

public interface Config {

  Set<String> getSectionNames();

  Set<String> getOptions(String section);

  Optional<List<String>> getAll(String section, String option);

  default Optional<String> get(String section, String option) {
    return getAll(section, option).map(items -> items.isEmpty() ? null : items.get(0));
  }

  default Optional<Integer> getInt(String section, String option) {
    return get(section, option).map(Integer::parseInt);
  }

  default Optional<Boolean> getBool(String section, String option) {
    return get(section, option).map(Boolean::parseBoolean);
  }

  default <X> X getClass(String section, String option, Class<X> typeOfClass, String defaultClazz) {
    String clazz = get(section, option).orElse(defaultClazz);

    // We don't declare a constant on the interface, natch.
    Logger.getLogger(Config.class.getName())
        .fine(String.format("Creating %s as instance of %s", clazz, typeOfClass));

    try {
      return ClassCreation.callCreateMethod(clazz, typeOfClass, this);
    } catch (ReflectiveOperationException e) {
      throw new IllegalArgumentException("Unable to find class: " + clazz, e);
    }
  }

  default List<String> toEntryList(Map<String, Object> mapItem) {
    return mapItem.entrySet().stream()
      .map(entry -> {
        return String.format("%s=%s", entry.getKey(), toJson(entry.getValue()));
      })
      .sorted()
      .collect(ImmutableList.toImmutableList());
  }

  default String toJson(Object value) {
    StringBuilder jsonStr = new StringBuilder();
    new Json().newOutput(jsonStr).setPrettyPrint(false).write(value);
    return jsonStr.toString();
  }
}
