/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2014 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.readers;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.commons.io.IOUtils;
  
  import io.wcm.maven.plugins.i18n.JsonUtil;
  import jakarta.json.JsonObject;
  import jakarta.json.JsonValue;
  
  /**
   * Reads i18n resources from JSON files.
   */
  public class JsonI18nReader implements I18nReader {
  
    @Override
    public Map<String, String> read(File sourceFile) throws IOException {
  
      String fileContent = IOUtils.toString(sourceFile.toURI().toURL(), StandardCharsets.UTF_8);
      try {
        JsonObject root = JsonUtil.fromString(fileContent);
        Map<String, String> map = new HashMap<>();
        parseJson(root, map, "");
        return map;
      }
      catch (IOException ex) {
        throw new IOException("Unable to read JSON from " + sourceFile.getAbsolutePath(), ex);
      }
    }
  
    private void parseJson(JsonObject node, Map<String, String> map, String prefix) throws IOException {
      for (Map.Entry<String, JsonValue> entry : node.entrySet()) {
        String key = entry.getKey();
        JsonValue value = entry.getValue();
        switch (value.getValueType()) {
          case OBJECT:
            parseJson(value.asJsonObject(), map, prefix + key + ".");
            break;
          case STRING:
            map.put(prefix + key, node.getString(key));
            break;
          default:
            throw new IOException("Unsupported JSON value: " + node.getValueType());
        }
      }
    }
  
  }