package cn.ksource.core.test;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;

import cn.ksource.core.util.ConvertUtil;

public class TestUtil {

	public static void main(String[] args) {
		for (int i = 0; i < 100; i++) {
			System.out.println(getRandomEnglishCharacters(6, 26));
		}
	}
	
	/**
	 * 获取英文随机数
	 * @param minLength
	 * @param maxLength
	 * @return
	 * @version V1.0.0
	 * @author 杨凯
	 * @date Jun 8, 2014 5:24:44 PM
	 */
	public static String getRandomEnglishCharacters(int minLength, int maxLength){
		String content = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
		String result = "";
		int length = getRandom(minLength, maxLength);
		int contentLength = content.length();
		int start = getRandom(0, contentLength-length);
		result = content.substring(start, start+length);
		return result;
	}
	
	
	/**
	 * 获得指定长度的随机汉字
	 * @param minLength
	 * @param maxLength
	 * @return
	 * @version V1.0.0
	 * @author 杨凯
	 * @date Jun 8, 2014 5:17:02 PM
	 */
	public static String getRandomChineseCharacters(int minLength,int maxLength){
		String filePath = TestUtil.class.getResource("/cn/ksource/core/test/")+"test_text.txt";
		String content = "";
		String truePath = StringUtils.removeStart(filePath, "file:/");
		String result = "";
		try {
			content = FileUtils.readFileToString(new File(truePath), "utf-8");
			int length = getRandom(minLength, maxLength);
			int contentLength = content.length();
			int start = getRandom(0, contentLength-length);
			result = content.substring(start, start+length);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 获取随机数
	 * @param max
	 * @return
	 * @version V1.0.0
	 * @author 杨凯
	 * @date Jun 8, 2014 4:45:47 PM
	 */
	public static int getRandom(int min,int max){
		for (int i = 0; i < 100000; i++) {
			double random = Math.random();
			int num = ConvertUtil.obj2Int(String.valueOf(random * max));
			if (num < max && num > min) {
				return num;
			}
		}
		return 0;
	}
	
}