package com.hcks.cmfds.commons.util;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;

import com.hcks.cmfds.commons.lang.PaginationList;


/**
 * 
 * @Author  刘厦(liusha.information@gmail.com)
 * @Date  创建时间：May 16, 2011 13:08:19 PM
 * @Version 0.0.0
 */
public class JsonUtils {
	
	private static ObjectMapper mapper = new ObjectMapper();
	public static final String SIMPLE_DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
	public static final SimpleDateFormat df = new SimpleDateFormat(SIMPLE_DATETIME_FORMAT);
	static {
		mapper.configure(org.codehaus.jackson.map.SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false);
		mapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
		mapper.getSerializationConfig().setDateFormat(df);
	}
	
	public static ObjectMapper getMapperBinder(){
		return mapper;
	}
	
	/**
	 * 将各种形式转换为json格式
	 * @param object
	 * @return
	 */
	public static String toJson(Object object) {
		try {
			return mapper.writeValueAsString(object);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
	
	/**
	 * 将json串 转换为已知对象
	 * @param json
	 * @param clazz
	 * @return
	 */
	public static Object fromJson(String json, Class<?> clazz) {
		try {
			return mapper.readValue(json, clazz);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
	
	/**
	 * 转换为grid数据
	 * @param data
	 * @param page
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static String wrapListForGrid(List data, int page) {
		if (page <= 0) page = 1;
		
		Map<String, Object> map = new HashMap<String, Object>(3);
		map.put("page", page);
		map.put("rows", data);
		
		if (data instanceof PaginationList) {
			map.put("total", ((PaginationList)data).getTotal());
		} else {
			map.put("total", data.size());
		}
		return toJson(map);
	}
	
	public static String getJsons(Object object) {
		ObjectMapper mappers = new ObjectMapper();
		 String SIMPLE_DATETIME_FORMAT = "yyyy-MM-dd";
		 SimpleDateFormat df = new SimpleDateFormat(SIMPLE_DATETIME_FORMAT);
		 mappers.configure(org.codehaus.jackson.map.SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false);
		 mappers.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
		 mappers.getSerializationConfig().setDateFormat(df);
		 try {
				return mappers.writeValueAsString(object);
			} catch (Exception e) {
				throw new RuntimeException(e);
			}
	}
	
	/**
	 * 转换为grid数据
	 * @param data
	 * @param page
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static String wrapListForGrid(List data, int page,List vos) {
		if (page <= 0) page = 1;
		
		Map<String, Object> map = new HashMap<String, Object>(3);
		map.put("page", page);
		map.put("rows", vos);
		
		if (data instanceof PaginationList) {
			map.put("total", ((PaginationList)data).getTotal());
		} else {
			map.put("total", data.size());
		}
		return toJson(map);
	}
}