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// 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.grid.common;

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;

import org.openqa.grid.common.exception.GridConfigurationException;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class JSONConfigurationUtils {

  /**
   * load a JSON file from the resource or file system.
   *
   * @param resource file or jar resource location
   * @return A JsonObject representing the passed resource argument.
   */
  public static JsonObject loadJSON(String resource) {
    InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(
        JSONConfigurationUtils.class.getPackage().getName().replace('.', '/') + '/' + resource);

    if (in == null) {
      try {
        in = new FileInputStream(resource);
      } catch (FileNotFoundException e) {
        // ignore
      }
    }

    if (in == null) {
      throw new RuntimeException(resource + " is not a valid resource.");
    }

    StringBuilder b = new StringBuilder();
    InputStreamReader inputreader = new InputStreamReader(in);
    BufferedReader buffreader = new BufferedReader(inputreader);
    String line;

    try {
      while ((line = buffreader.readLine()) != null) {
        b.append(line);
      }
    } catch (IOException e) {
      throw new GridConfigurationException("Cannot read file " + resource + " , " + e.getMessage(), e);
    } finally {
      try {
        buffreader.close();
        inputreader.close();
        in.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

    try {
      return new JsonParser().parse(b.toString()).getAsJsonObject();
    } catch (JsonSyntaxException e) {
      throw new GridConfigurationException("Wrong format for the JSON input : " + e.getMessage(), e);
    }
  }
}