package com.palmnest.application.core.util;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Timestamp;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

/**
 * 集合服务帮助类
 *
 * @author yubign
 * @since 2016-07-11
 */
public class CollectionUtils {

	public static <T> void sortList(List<T> list, final String sortField, final String sortMode) {
		if (list == null || list.size() < 2) {
			return;
		}
		Collections.sort(list, new Comparator<T>() {
			@Override
			public int compare(T o1, T o2) {
				try {
					Class clazz = o1.getClass();
					Field field = clazz.getDeclaredField(sortField); //获取成员变量
					field.setAccessible(true); //设置成可访问状态
					String typeName = field.getType().getName().toLowerCase(); //转换成小写

					Object v1 = field.get(o1); //获取field的值
					Object v2 = field.get(o2); //获取field的值

					boolean ASC_order = (sortMode == null || "ASC".equalsIgnoreCase(sortMode));

					//判断字段数据类型，并比较大小
					if (typeName.endsWith("string")) {
						String value1 = v1.toString();
						String value2 = v2.toString();
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("short")) {
						Short value1 = Short.parseShort(v1.toString());
						Short value2 = Short.parseShort(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("byte")) {
						Byte value1 = Byte.parseByte(v1.toString());
						Byte value2 = Byte.parseByte(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("char")) {
						Integer value1 = (int) (v1.toString().charAt(0));
						Integer value2 = (int) (v2.toString().charAt(0));
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("int") || typeName.endsWith("integer")) {
						Integer value1 = Integer.parseInt(v1.toString());
						Integer value2 = Integer.parseInt(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("long")) {
						Long value1 = Long.parseLong(v1.toString());
						Long value2 = Long.parseLong(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("float")) {
						Float value1 = Float.parseFloat(v1.toString());
						Float value2 = Float.parseFloat(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("double")) {
						Double value1 = Double.parseDouble(v1.toString());
						Double value2 = Double.parseDouble(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("boolean")) {
						Boolean value1 = Boolean.parseBoolean(v1.toString());
						Boolean value2 = Boolean.parseBoolean(v2.toString());
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("date")) {
						Date value1 = (Date) (v1);
						Date value2 = (Date) (v2);
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("timestamp")) {
						Timestamp value1 = (Timestamp) (v1);
						Timestamp value2 = (Timestamp) (v2);
						return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
					} else {
						//调用对象的compareTo()方法比较大小
						Method method = field.getType().getDeclaredMethod("compareTo", new Class[]{field.getType()});
						method.setAccessible(true); //设置可访问权限
						int result = (Integer) method.invoke(v1, new Object[]{v2});
						return ASC_order ? result : result * (-1);
					}
				} catch (Exception e) {
					String err = e.getLocalizedMessage();
					System.out.println(err);
					e.printStackTrace();
				}

				return 0; //未知类型，无法比较大小
			}
		});
	}

}
