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package com.netease.cloud.util;

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

import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

/**
 * Utilities for parsing and formatting dates.
 * 
 * Note that this class doesn't use static methods because of the
 * synchronization issues with SimpleDateFormat. This lets synchronization be
 * done on a per-object level, instead of on a per-class level.
 */
public class DateUtils {

	// ISO8601日起格式
	private static final DateTimeFormatter iso8601DateFormat = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS Z")
			.withLocale(Locale.US);
	
	private static final DateTimeFormatter alternateIso8601DateFormat = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss Z")
			.withLocale(Locale.US);
	
	private static final DateTimeFormatter alternateIso8601DateFormatUTC = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss Z")
			.withLocale(Locale.US).withZoneUTC();
	

	// RFC1123 日期格式
	private static final DateTimeFormatter rfc822DateFormat = DateTimeFormat
			.forPattern("EEE, dd MMM yyyy HH:mm:ss ZZZ").withLocale(Locale.US);

	private static final DateTimeFormatter rfc822DateFormatShangHai = DateTimeFormat
			.forPattern("EEE, dd MMM yyyy HH:mm:ss ZZZ").withLocale(Locale.US).withZone(DateTimeZone.forID("Asia/Shanghai"));

	/** RFC 822 format */
	/**
	 * Constructs a new DateUtils object, ready to parse/format dates.
	 */
	public DateUtils() {
	}

	/**
	 * Parses the specified date string as an ISO 8601 date and returns the Date
	 * object.
	 * 
	 * @param dateString
	 *            The date string to parse.
	 * 
	 * @return The parsed Date object.
	 * 
	 * @throws ParseException
	 *             If the date string could not be parsed.
	 */
	public Date parseIso8601Date(String dateString) throws ParseException {
		try {
			return new Date(iso8601DateFormat.parseMillis(dateString));
		} catch (Exception e) {
				return new Date(alternateIso8601DateFormat.parseMillis(dateString));
		}
	}

	/**
	 * Formats the specified date as an ISO 8601 string.
	 * 
	 * @param date
	 *            The date to format.
	 * 
	 * @return The ISO 8601 string representing the specified date.
	 */
	public String formatIso8601Date(Date date) {
		return iso8601DateFormat.print(date.getTime());
	}
	
	public String formatIso8601DateUTC(Date date) {
		return alternateIso8601DateFormatUTC.print(date.getTime()).replace("+0800", "Z");
	}

	/**
	 * Parses the specified date string as an RFC 822 date and returns the Date
	 * object.
	 * 
	 * @param dateString
	 *            The date string to parse.
	 * 
	 * @return The parsed Date object.
	 * 
	 * @throws ParseException
	 *             If the date string could not be parsed.
	 */
	public Date parseRfc822Date(String dateString) throws ParseException {
		long mills = rfc822DateFormat.parseMillis(dateString);
		return new Date(mills);
	}

	/**
	 * Formats the specified date as an RFC 822 string.
	 * 
	 * @param date
	 *            The date to format.
	 * 
	 * @return The RFC 822 string representing the specified date.
	 */
	public String formatRfc822Date(Date date) {
		return rfc822DateFormat.print(date.getTime());
	}
	
	public String formatRfc822DateShangHai(Date date) {
		return rfc822DateFormatShangHai.print(date.getTime());
	}
}