/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2022 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.devops.conga.plugins.aem.maven.model;
  
  import java.util.Collections;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * Helper methods for {@link ModelParser}.
   */
  final class ParserUtil {
  
    private static final String PROP_VARIANTS = "variants";
  
    private ParserUtil() {
      // static methods only
    }
  
    @SuppressWarnings("unchecked")
    static List<Map<String, Object>> children(Map<String, Object> data, String propertyName) {
      List<Map<String, Object>> children = (List<Map<String, Object>>)data.get(propertyName);
      if (children == null) {
        return Collections.emptyList();
      }
      else {
        return children;
      }
    }
  
    @SuppressWarnings("unchecked")
    static Set<String> toStringSet(Object value) {
      Set<String> result = new LinkedHashSet<>();
      if (value instanceof String stringValue) {
        String target = stringValue;
        if (StringUtils.isNotBlank(target)) {
          result.add(target);
        }
      }
      else if (value instanceof List) {
        result.addAll(((List<String>)value).stream()
            .filter(StringUtils::isNotBlank)
            .toList());
      }
      else {
        throw new IllegalArgumentException("Value is neither string nor string list: " + value);
      }
      return result;
    }
  
    @SuppressWarnings("unchecked")
    static List<String> getVariants(Map<String, Object> roleData) {
      List<String> variants = (List<String>)roleData.get(PROP_VARIANTS);
      if (variants != null) {
        return variants;
      }
      else {
        return Collections.emptyList();
      }
    }
  
  }