/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2023 wcm.io
    * %%
    * 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.
   * #L%
   */
  package io.wcm.maven.plugins.i18n;
  
  import java.io.IOException;
  import java.io.StringReader;
  import java.io.StringWriter;
  import java.util.Map;
  
  import jakarta.json.Json;
  import jakarta.json.JsonObject;
  import jakarta.json.JsonReader;
  import jakarta.json.JsonReaderFactory;
  import jakarta.json.JsonWriter;
  import jakarta.json.JsonWriterFactory;
  import jakarta.json.stream.JsonGenerator;
  import jakarta.json.stream.JsonParsingException;
  
  /**
   * Helper methods for JSON handling.
   */
  public final class JsonUtil {
  
    private static final JsonWriterFactory JSON_WRITER_FACTORY = Json.createWriterFactory(Map.of(
        JsonGenerator.PRETTY_PRINTING, true));
  
    private static final JsonReaderFactory JSON_READER_FACTORY = Json.createReaderFactory(Map.of(
        "org.apache.johnzon.supports-comments", true));
  
    private JsonUtil() {
      // static methods only
    }
  
    /**
     * Serialize JSON object to String.
     * @param jsonObject JSON object
     * @return String
     */
    public static String toString(JsonObject jsonObject) {
      StringWriter writer = new StringWriter();
      try (JsonWriter jsonWriter = JSON_WRITER_FACTORY.createWriter(writer)) {
        jsonWriter.write(jsonObject);
        return writer.toString();
      }
    }
  
    /**
     * Parse JSON string to JSON object.
     * @param jsonString JSON string
     * @return JSON object
     * @throws IOException if JSON parsing fails
     */
    public static JsonObject fromString(String jsonString) throws IOException {
      StringReader reader = new StringReader(jsonString);
      try (JsonReader jsonReader = JSON_READER_FACTORY.createReader(reader)) {
        return jsonReader.readObject();
      }
      catch (JsonParsingException ex) {
        throw new IOException(ex.getMessage(), ex);
      }
    }
  
  }