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package org.qas.api.internal.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.SimpleTimeZone;
import java.util.TimeZone;

/**
 * Dates
 *
 * @author Dzung Nguyen
 * @version $Id Dates 2014-03-27 09:27:30z dungvnguyen $
 * @since 1.0
 */
public final class Dates {
  //~ class properties ========================================================
  protected final SimpleDateFormat urlDateFormat = new SimpleDateFormat("yyyyMMdd");
  protected final SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd");
  protected final SimpleDateFormat iso8601DateTimeFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
  protected final SimpleDateFormat alternateIso8601DateTimeFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
  protected final SimpleDateFormat alternateIso8601DateTimeFormatWithoutZ = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
  protected final SimpleDateFormat rfc822DateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.US);

  //~ class members ===========================================================
  private Dates() {
    iso8601DateFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
    iso8601DateTimeFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
    alternateIso8601DateTimeFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
    alternateIso8601DateTimeFormatWithoutZ.setTimeZone(new SimpleTimeZone(0, "GMT"));
    rfc822DateFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
  }

  public static Dates getInstance() {
    return new Dates();
  }

  public Date parseIso8601Date(String source) throws ParseException {
    if (source == null || "".equals(source)) return null;

    // check include timezone.
    int tzPos = source.indexOf("+");
    if (tzPos > 0 && (source.charAt(tzPos + 3) == ':') && (source.length() > tzPos + 4)) {
      source = source.substring(0, tzPos + 3) + source.substring(tzPos + 4);
    }

    try {
      synchronized (iso8601DateTimeFormat) {
        return iso8601DateTimeFormat.parse(source);
      }
    } catch (ParseException ex) {
      try {
        synchronized (alternateIso8601DateTimeFormat) {
          return alternateIso8601DateTimeFormat.parse(source);
        }
      } catch (ParseException pex) {
        try {
          synchronized (alternateIso8601DateTimeFormatWithoutZ) {
            return alternateIso8601DateTimeFormatWithoutZ.parse(source);
          }
        } catch (ParseException ppex) {
          synchronized (iso8601DateFormat) {
            return iso8601DateFormat.parse(source);
          }
        }
      }
    }
  }

  public Date parseRfc822Date(String source) throws ParseException {
    synchronized (rfc822DateFormat) {
      return rfc822DateFormat.parse(source);
    }
  }

  public String formatAlternateIso8601Date(Date date) {
    synchronized (alternateIso8601DateTimeFormat) {
      return alternateIso8601DateTimeFormat.format(date);
    }
  }

  public String formatIso8601DateTime(Date date) {
    synchronized (iso8601DateTimeFormat) {
      return iso8601DateTimeFormat.format(date);
    }
  }

  public String formatIso8601Date(Date date) {
    synchronized (iso8601DateFormat) {
      return iso8601DateFormat.format(date);
    }
  }

  public String formaturlDate(Date date) {
    synchronized (urlDateFormat) {
      return urlDateFormat.format(date);
    }
  }

  public String formatRfc822Date(Date date) {
    synchronized (rfc822DateFormat) {
      return rfc822DateFormat.format(date);
    }
  }
}