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/*
 * Copyright (C) 2021-2023 Thomas Akehurst
 *
 * 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.
 */
package com.github.tomakehurst.wiremock.extension.responsetemplating.helpers;

import com.fasterxml.jackson.core.type.TypeReference;
import com.github.jknack.handlebars.Options;
import com.github.jknack.handlebars.TagType;
import com.github.tomakehurst.wiremock.common.Json;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ParseJsonHelper extends HandlebarsHelper {

  @Override
  public Object apply(Object context, Options options) throws IOException {
    CharSequence json;
    String variableName;
    Object result = new HashMap();

    // Edge case if null JSON object passed in
    if (context == null) {
      return result;
    }

    boolean hasContext = context != options.context.model();

    if (options.tagType == TagType.SECTION) {
      json = options.apply(options.fn);
      variableName = hasContext ? context.toString() : null;
    } else {
      if (!hasContext) {
        return handleError("Missing required JSON string parameter");
      }

      json = context.toString();
      variableName = options.params.length > 0 ? options.param(0) : null;
    }

    if (json != null) {
      String jsonAsString = json.toString().trim();

      // Edge case if JSON object is empty {}
      String jsonAsStringWithoutSpace = jsonAsString.replaceAll("\\s", "");
      if (jsonAsStringWithoutSpace.equals("{}") || jsonAsStringWithoutSpace.isEmpty()) {
        result = new HashMap();
      } else {
        if (jsonAsString.startsWith("[") && jsonAsString.endsWith("]")) {
          result = Json.read(jsonAsString, new TypeReference>() {});
        } else {
          result = Json.read(jsonAsString, new TypeReference>() {});
        }
      }
    }

    if (variableName != null) {
      options.context.data(variableName, result);
      return null;
    }

    return result;
  }
}
 















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