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package net.sf.xmlform.util;

import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.YearMonth;
import java.time.format.DateTimeFormatter;

public class TimeUtils {
	private static DateTimeFormatter localDateParseFormatter=DateTimeFormatter.ofPattern("yyyy-M-d");
	private static DateTimeFormatter localDateFormatter=DateTimeFormatter.ofPattern("yyyy-MM-dd");
	
	private static DateTimeFormatter localTimeParseFormatter=DateTimeFormatter.ofPattern("H:m:s");
	private static DateTimeFormatter localTimeMicroParseFormatter=DateTimeFormatter.ofPattern("H:m:s.SSS");
	private static DateTimeFormatter localTimeFormatter=DateTimeFormatter.ofPattern("HH:mm:ss");
	
	private static DateTimeFormatter localDateTimeParseFormatter=DateTimeFormatter.ofPattern("yyyy-M-d H:m:s");
	private static DateTimeFormatter localDateTimeTParseFormatter=DateTimeFormatter.ofPattern("yyyy-M-d'T'H:m:s");
	private static DateTimeFormatter localDateTimeMicroParseFormatter=DateTimeFormatter.ofPattern("yyyy-M-d H:m:s.SSS");
	private static DateTimeFormatter localDateTimeMicroTParseFormatter=DateTimeFormatter.ofPattern("yyyy-M-d'T'H:m:s.SSS");
	private static DateTimeFormatter localDateTimeFormatter=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
	
	private static DateTimeFormatter localYearMonthParseFormatter=DateTimeFormatter.ofPattern("yyyy-M");
	private static DateTimeFormatter localYearMonthFormatter=DateTimeFormatter.ofPattern("yyyy-MM");
	
	static public LocalDate parseLocalDate(String source){
		if(source==null||source.length()==0)
			return null;
		return LocalDate.parse(source, localDateParseFormatter);
	}
	
	static public String formatLocalDate(LocalDate date){
		if(date==null)
			return null;
		return date.format(localDateFormatter);
	}
	static public LocalDate convertToLocalDate(Object value) {
		if(value==null)
			return null;
		LocalDate localDate=null;
		if(value instanceof LocalDate) {
			localDate=(LocalDate)value;
		} else if(value instanceof Timestamp){
			Timestamp ts=(Timestamp)value;
			localDate=ts.toLocalDateTime().toLocalDate();
		}else if(value instanceof Date) {
			Date date=(Date)value;
			localDate=date.toLocalDate();
		}else {
			throw new IllegalArgumentException("Invalid date "+value);
		}
		return localDate;
	}
	static public boolean isLocalDate(String source){
		try{
			parseLocalDate(source);
			return true;
		}catch(Exception e){
			return false;
		}
	}
	
	static public LocalTime parseLocalTime(String source){
		if(source==null||source.length()==0)
			return null;
		if(source.indexOf(".")>0)
			return LocalTime.parse(source, localTimeMicroParseFormatter);
		return LocalTime.parse(source, localTimeParseFormatter);
	}
	static public String formatLocalTime(LocalTime time){
		if(time==null)
			return null;
		return time.format(localTimeFormatter);
	}
	static public boolean isLocalTime(String source){
		try{
			parseLocalTime(source);
			return true;
		}catch(Exception e){
			return false;
		}
	}
	static public LocalTime convertToLocalTime(Object value) {
		if(value==null)
			return null;
		LocalTime localTime=null;
		if(value instanceof LocalTime) {
			localTime=(LocalTime)value;
		} else if(value instanceof Time){
			Time ts=(Time)value;
			localTime=ts.toLocalTime();
		}else {
			throw new IllegalArgumentException("Invalid time "+value);
		}
		return localTime;
	}
	
	static public LocalDateTime parseLocalDateTime(String source){
		if(source==null||source.length()==0)
			return null;
		if(source.indexOf(".")>0) {
			if(source.indexOf('T')>0)
				return LocalDateTime.parse(source, localDateTimeMicroTParseFormatter);
			return LocalDateTime.parse(source, localDateTimeMicroParseFormatter);
		}
		if(source.indexOf('T')>0)
			return LocalDateTime.parse(source, localDateTimeTParseFormatter);
		return LocalDateTime.parse(source, localDateTimeParseFormatter);
	}
	static public String formatLocalDateTime(LocalDateTime time){
		if(time==null)
			return null;
		return time.format(localDateTimeFormatter);
	}
	static public boolean isLocalDateTime(String source){
		try{
			parseLocalDateTime(source);
			return true;
		}catch(Exception e){
			return false;
		}
	}
	static public LocalDateTime convertToLocalDateTime(Object value) {
		if(value==null)
			return null;
		LocalDateTime localDate=null;
		if(value instanceof LocalDateTime) {
			localDate=(LocalDateTime)value;
		} else if(value instanceof Timestamp){
			Timestamp ts=(Timestamp)value;
			localDate=ts.toLocalDateTime();
		}else {
			throw new IllegalArgumentException("Invalid datetime "+value);
		}
		return localDate;
	}
	
	static public YearMonth parseYearMonth(String source){
		if(source==null||source.length()==0)
			return null;
		return YearMonth.parse(source, localYearMonthParseFormatter);
	}
	static public String formatYearMonth(YearMonth time){
		if(time==null)
			return null;
		return time.format(localYearMonthFormatter);
	}
	static public boolean isYearMonth(String source){
		try{
			parseYearMonth(source);
			return true;
		}catch(Exception e){
			return false;
		}
	}
	static public YearMonth convertToYearMonth(Object value) {
		if(value==null)
			return null;
		YearMonth yearMonth=null;
		if(value instanceof YearMonth) {
			yearMonth=(YearMonth)value;
		} else if(value instanceof String){
			return parseYearMonth((String)value);
		}else {
			throw new IllegalArgumentException("Invalid date "+value);
		}
		return yearMonth;
	}
}