package com.cowr.common.utils;

import com.jfinal.kit.StrKit;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateTimeUtil {
    public static final String ymdhms = "yyyy-MM-dd HH:mm:ss";

    public static final ThreadLocal<SimpleDateFormat> sdf    = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd");
        }
    };
    public static final ThreadLocal<SimpleDateFormat> sdfymd = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy年MM月dd日");
        }
    };
    public static final ThreadLocal<SimpleDateFormat> sd    = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM");
        }
    };
    public static final ThreadLocal<SimpleDateFormat> sdfym = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy年MM月");
        }
    };
    public static final ThreadLocal<SimpleDateFormat> sdfhms = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        }
    };
    public static final ThreadLocal<SimpleDateFormat> sdfhm = new ThreadLocal<SimpleDateFormat>() {
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm");
        }
    };
    /**
     * 验证是否符合格式的时间字符串
     * @param str
     * @param fmt
     * @return
     */
    public static boolean isValidDate(String str, String fmt) {
        if (!StrKit.notBlank(str, fmt)) {
            return false;
        }

        SimpleDateFormat sdf = new SimpleDateFormat(fmt);
        try {
            // 设置lenient为false.
            // 否则SimpleDateFormat会比较宽松地验证日期，比如2007/02/29会被接受，并转换成2007/03/01
            sdf.setLenient(false);
            Date tm = sdf.parse(str);

            return sdf.format(tm).equals(str); // 将转换后的时间再格式化，和原字符串对比，检查是否一致
        } catch (ParseException e) {
            // e.printStackTrace();
            // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
            return false;
        }
    }
}