package org.example.opc.unit;

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

public class DateTool {

	public static String getLocalTime() {
		Date date = new Date();
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
		String localTime = formatter.format(date);
		return localTime;
	}

	public static Date getLocalTimeForDate() {
		//创建SimpleDateFormat对象实例并定义好转换格式
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		Date date = new Date();
		try {
			String localTime = sdf.format(date);
			// 注意格式需要与上面一致，不然会出现异常
			date = sdf.parse(localTime);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return date;
	}

	public static Calendar getCalendar(Date date) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		return cal;
	}

	public static String getCurrentDate(String pattern) {
		Date date = new Date();

		String s = dateToStr(date, pattern);
		return s;
	}

	public static Date parseDate(String source) {
		if ((source == null) || (source.length() == 0)) {
			return null;
		}
		String[] datePattern = { "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd", "HH:mm:ss" };
		Date date = null;
		for (int i = 0; i < datePattern.length; i++) {
			date = parseDate(source, datePattern[i]);
			if (date != null) {
				break;
			}
		}
		return date;
	}

	public static Calendar parseCal(String source) {
		if ((source == null) || (source.length() == 0)) {
			return null;
		}
		String[] datePattern = { "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd", "HH:mm:ss" };
		Calendar date = null;
		for (int i = 0; i < datePattern.length; i++) {
			date = parseCal(source, datePattern[i]);
			if (date != null) {
				break;
			}
		}
		return date;
	}

	public static Date parseDate(String dateStr, String format) {
		SimpleDateFormat dateFormat = new SimpleDateFormat(format);
		Date date = null;
		try {
			date = dateFormat.parse(dateStr);
		} catch (ParseException localParseException) {
		}
		return date;
	}

	public static Calendar parseCal(String dateStr, String format) {
		SimpleDateFormat dateFormat = new SimpleDateFormat(format);
		Calendar date = Calendar.getInstance();
		try {
			date.setTime(dateFormat.parse(dateStr));
		} catch (ParseException localParseException) {
		}
		return date;
	}

	public static int diffDate(Date end, Date start) {
		return (int) (getMillis(end) / 86400000L - getMillis(start) / 86400000L);
	}

	public static long diffSecond(Date end, Date start) {
		return (getMillis(end) - getMillis(start)) / 1000L;
	}

	private static long getMillis(Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		return c.getTimeInMillis();
	}

	public static String getNow() {
		Date now = new Date();
		return formatDateTime(now);
	}

	public static String getNow(String pattern) {
		Date now = new Date();
		return formatDate(now, pattern);
	}

	public static String formatDate(String dateStr, String pattern) {
		Date date = parseDate(dateStr);
		return formatDate(date, pattern);
	}

	public static String formatTime(Date date) {
		String pattern = "HH:mm:ss";
		return formatDate(date, pattern);
	}

	public static String formatDate(Date date) {
		String pattern = "yyyy-MM-dd";
		return formatDate(date, pattern);
	}

	public static String formatDateTime(Date date) {
		String pattern = "yyyy-MM-dd HH:mm:ss";
		return formatDate(date, pattern);
	}

	public static String formatDateTime(Calendar cal) {
		String pattern = "yyyy-MM-dd HH:mm:ss";
		if (cal == null) {
			return "";
		}
		return formatDate(cal.getTime(), pattern);
	}

	public static String formatDate(Date date, String pattern) {
		String dateTimePattern = pattern;
		if (date == null) {
			if ((dateTimePattern.length() > 2)
					&& (dateTimePattern.substring(dateTimePattern.length() - 2).equals("_e"))) {
				dateTimePattern = dateTimePattern.replaceAll("(yy|YY){1,2}", "        ");
				dateTimePattern = dateTimePattern.replaceAll("(M){1,2}", "    ");
				dateTimePattern = dateTimePattern.replaceAll("(d|D){1,2}", "    ");
				dateTimePattern = dateTimePattern.replaceAll("(h|H){1,2}", "    ");
				dateTimePattern = dateTimePattern.replaceAll("(m){1,2}", "    ");
				dateTimePattern = dateTimePattern.replaceAll("(s|S){1,2}", "    ");

				return dateTimePattern.substring(0, dateTimePattern.length() - 2);
			}
			return "";
		}
		if ((dateTimePattern.length() > 2) && (dateTimePattern.substring(dateTimePattern.length() - 2).equals("_e"))) {
			dateTimePattern = dateTimePattern.substring(0, dateTimePattern.length() - 2);
		}
		if ((dateTimePattern == null) || (dateTimePattern.length() == 0)) {
			return formatDateTime(date);
		}
		SimpleDateFormat sdf = new SimpleDateFormat();
		try {
			sdf.applyPattern(dateTimePattern);
		} catch (IllegalArgumentException exp) {
			sdf.applyPattern("yyyy-MM-dd HH:mm:ss");
		}
		return sdf.format(date);
	}

	public static int getCurrYear() {
		Calendar cal = Calendar.getInstance();
		return cal.get(1);
	}

	public static int getCurrMonth() {
		Calendar cal = Calendar.getInstance();
		return cal.get(2) + 1;
	}

	public static String getCurrtWeekDay() {
		Date date = new Date();
		String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int w = cal.get(7) - 1;
		if (w < 0) {
			w = 0;
		}
		return weekDays[w];
	}

	public static int getCurrDay() {
		Calendar cal = Calendar.getInstance();
		return cal.get(5);
	}

	public static int getWeekOfYear(Date date) {
		Calendar c = new GregorianCalendar();
		c.setFirstDayOfWeek(2);
		c.setMinimalDaysInFirstWeek(7);
		c.setTime(date);

		return c.get(3);
	}

	public static int getWeekOfYear() {
		return getWeekOfYear(new Date());
	}

	public static int getMaxWeekNumOfYear(int year) {
		Calendar c = new GregorianCalendar();
		c.set(year, 11, 31, 23, 59, 59);

		return getWeekOfYear(c.getTime());
	}

	public static Date getFirstDayOfWeek(int year, int week) {
		Calendar c = new GregorianCalendar();
		c.set(1, year);
		c.set(2, 0);
		c.set(5, 1);

		Calendar cal = (GregorianCalendar) c.clone();
		cal.add(5, week * 7);

		return getFirstDayOfWeek(cal.getTime());
	}

	public static Date getLastDayOfWeek(int year, int week) {
		Calendar c = new GregorianCalendar();
		c.set(1, year);
		c.set(2, 0);
		c.set(5, 1);

		Calendar cal = (GregorianCalendar) c.clone();
		cal.add(5, week * 7);

		return getLastDayOfWeek(cal.getTime());
	}

	public static Date getFirstDayOfWeek(Date date) {
		Calendar c = new GregorianCalendar();
		c.setFirstDayOfWeek(2);
		c.setTime(date);
		c.set(7, c.getFirstDayOfWeek());
		return c.getTime();
	}

	public static Date getLastDayOfWeek(Date date) {
		Calendar c = new GregorianCalendar();
		c.setFirstDayOfWeek(2);
		c.setTime(date);
		c.set(7, c.getFirstDayOfWeek() + 6);
		return c.getTime();
	}

	public static Date getFirstDayOfFirstWeek(int year, int month) {
		Calendar c = Calendar.getInstance();
		c.setFirstDayOfWeek(2);
		c.set(year, month, 1);

		c.set(8, 1);
		c.set(7, 2);

		return c.getTime();
	}

	public static Date getYesterday() {
		Calendar c = new GregorianCalendar();
		c.set(5, c.get(5) - 1);
		Date date = c.getTime();
		return date;
	}

	public static Date getTomorrow() {
		Calendar c = new GregorianCalendar();
		c.set(5, c.get(5) + 1);
		Date date = c.getTime();
		return date;
	}

	public static Date getPreMonth(Date date) {
		GregorianCalendar c = new GregorianCalendar();
		c.setTime(date);
		c.add(2, -1);
		return c.getTime();
	}


	public static int getDayCountByTwoDates(String strDate1, String strDate2) {
		int differ = 0;
		try {
			SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
			Date date1 = format.parse(strDate1);
			Date date2 = format.parse(strDate2);
			differ = (int) ((date1.getTime() - date2.getTime()) / 86400000L);
		} catch (Exception e) {
			differ = -1;
		}
		return differ;
	}

	public static String dateToStr(Date date, String pattern) {
		if (date == null) {
			return "";
		}
		String pat = pattern;
		if ((pat == null) || (pat.length() == 0)) {
			pat = "yyyy-MM-dd HH:mm:ss";
		}
		SimpleDateFormat sdf = new SimpleDateFormat(pat);

		return sdf.format(date);
	}

	public static Calendar addSeconds(Calendar cal, int amount) {
		Calendar cal2 = Calendar.getInstance();
		cal2.setTime(cal.getTime());
		cal2.add(13, amount);
		return cal2;
	}
}