/*
 * Copyright (C) 2003-2011 eXo Platform SAS.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.exoplatform.social.client.api.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.util.EntityUtils;
import org.exoplatform.social.client.api.model.Model;
import org.exoplatform.social.client.api.net.SocialHttpClientException;
import org.json.simple.JSONArray;
import org.json.simple.JSONValue;
import org.json.simple.parser.ContainerFactory;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

/**
 * Created by The eXo Platform SAS
 * Author : eXoPlatform
 *          exo@exoplatform.com
 * Jun 30, 2011  
 */
public class SocialJSONDecodingSupport {
  /**
   * Parse JSON text into java Model object from the input source.
   * and then it's base on the class type.
   * 
   * @param <T> Generic type must extend from Model.
   * @param clazz Class type.
   * @param jsonContent Json content which you need to create the Model
   * @throws ParseException Throw this exception if any
   * 
   */
  public static <T extends Model> T parser(final Class<T> clazz, String jsonContent) throws ParseException {
    JSONParser parser = new JSONParser();
    ContainerFactory containerFactory = new ContainerFactory() {
      public List<T> creatArrayContainer() {
        return new LinkedList<T>();
      }

      public T createObjectContainer() {
        try {
          return clazz.newInstance();
        } catch (InstantiationException e) {
          return null;
        } catch (IllegalAccessException e) {
          return null;
        }
      }
    };
    return (T) parser.parse(jsonContent, containerFactory);
  }
  
  /**
   * Parse JSON text into java Model object from the input source.
   * and then it's base on the class type.
   * 
   * @param <T> Generic type must extend from Model.
   * @param clazz Class type.
   * @param response HttpResponse which getting the JSONContent.
   * @throws ParseException Throw this exception if any
   * @throws IOException Throw this exception if any
   */
  public static <T extends Model> T parser(final Class<T> clazz, HttpResponse response) throws IOException, ParseException {
    //Read InputStream from HttpResponse to Buffered
    HttpEntity entity = SocialHttpClientSupport.processContent(response);
    //Check the content length
    if (entity.getContentLength() != -1) {
      //getting the HttpResponse content
      String jsonContent = EntityUtils.toString(entity);
      //close stream
      SocialHttpClientSupport.consume(entity);
      return parser(clazz, jsonContent);
    } else {
      return null;
    }
  }
  
  /**
   * Parse JSON text into java Map object from the input source.
   *  
   * @param jsonContent Json content which you need to create the Model
   * @throws ParseException Throw this exception if any
   */
  public static Map parser(String jsonContent) throws ParseException {
    JSONParser parser = new JSONParser();
    ContainerFactory containerFactory = new ContainerFactory() {
      public List creatArrayContainer() {
        return new LinkedList();
      }

      public Map createObjectContainer() {
          return new LinkedHashMap();
      }
    };
    return (Map) parser.parse(jsonContent, containerFactory);
  }

  /**
   * HttpResponse text into java Map object from the input source.
   *  
   * @param response HttpResponse to get the content.
   * @throws ParseException Throw this exception if any
   */
  public static Map parser(HttpResponse response) throws ParseException {
    String jsonContent = null;
    try {
      jsonContent = SocialHttpClientSupport.getContent(response);
    } catch (SocialHttpClientException e) {
      throw new ParseException(0);
    }
    return parser(jsonContent);
  }

  /**
   *  
   * @author Ly Minh Phuong - http://phuonglm.net
   * @param <T>
   * @param clazz
   * @param response
   * @return
   * @throws IOException
   * @throws ParseException
   */
  public static <T extends Model > List<T> JSONArrayObjectParser(final Class<T> clazz, HttpResponse response) throws IOException, ParseException{
    //Read InputStream from HttpResponse to Buffered
    HttpEntity entity = SocialHttpClientSupport.processContent(response);
    //Check the content length
    if (entity.getContentLength() != -1) {
      //getting the HttpResponse content
      String jsonContent = EntityUtils.toString(entity);
      //close stream
      SocialHttpClientSupport.consume(entity);
      return JSONArrayObjectParser(clazz, jsonContent);
    } else {
      return null;
    }
  }
  
  /**
   * 
   * @author Ly Minh Phuong - http://phuonglm.net
   * @param <T>
   * @param clazz
   * @param jsonArrayContent
   * @return
   * @throws IOException
   * @throws ParseException
   */
  public static <T extends Model > List<T> JSONArrayObjectParser(final Class<T> clazz, String jsonArrayContent) throws IOException, ParseException{
    JSONArray jsonResultArray = (JSONArray)JSONValue.parse(jsonArrayContent);
    List<T> result = new ArrayList<T>();
    for (Object jsonObject : jsonResultArray) {
      String jsonString = jsonObject.toString();
      result.add(parser(clazz,jsonString));
    }
    return result;
  }
}