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package com.earth2me.essentials.utils;
import static com.earth2me.essentials.I18n.tl;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DateUtil
{
public static long parseDateDiff(String time, boolean future) throws Exception
{
Pattern timePattern = Pattern.compile("(?:([0-9]+)\\s*y[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*mo[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*w[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*d[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*h[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*m[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*(?:s[a-z]*)?)?", Pattern.CASE_INSENSITIVE);
Matcher m = timePattern.matcher(time);
int years = 0;
int months = 0;
int weeks = 0;
int days = 0;
int hours = 0;
int minutes = 0;
int seconds = 0;
boolean found = false;
while (m.find())
{
if (m.group() == null || m.group().isEmpty())
{
continue;
}
for (int i = 0; i < m.groupCount(); i++)
{
if (m.group(i) != null && !m.group(i).isEmpty())
{
found = true;
break;
}
}
if (found)
{
if (m.group(1) != null && !m.group(1).isEmpty())
{
years = Integer.parseInt(m.group(1));
}
if (m.group(2) != null && !m.group(2).isEmpty())
{
months = Integer.parseInt(m.group(2));
}
if (m.group(3) != null && !m.group(3).isEmpty())
{
weeks = Integer.parseInt(m.group(3));
}
if (m.group(4) != null && !m.group(4).isEmpty())
{
days = Integer.parseInt(m.group(4));
}
if (m.group(5) != null && !m.group(5).isEmpty())
{
hours = Integer.parseInt(m.group(5));
}
if (m.group(6) != null && !m.group(6).isEmpty())
{
minutes = Integer.parseInt(m.group(6));
}
if (m.group(7) != null && !m.group(7).isEmpty())
{
seconds = Integer.parseInt(m.group(7));
}
break;
}
}
if (!found)
{
throw new Exception(tl("illegalDate"));
}
Calendar c = new GregorianCalendar();
if (years > 0)
{
c.add(Calendar.YEAR, years * (future ? 1 : -1));
}
if (months > 0)
{
c.add(Calendar.MONTH, months * (future ? 1 : -1));
}
if (weeks > 0)
{
c.add(Calendar.WEEK_OF_YEAR, weeks * (future ? 1 : -1));
}
if (days > 0)
{
c.add(Calendar.DAY_OF_MONTH, days * (future ? 1 : -1));
}
if (hours > 0)
{
c.add(Calendar.HOUR_OF_DAY, hours * (future ? 1 : -1));
}
if (minutes > 0)
{
c.add(Calendar.MINUTE, minutes * (future ? 1 : -1));
}
if (seconds > 0)
{
c.add(Calendar.SECOND, seconds * (future ? 1 : -1));
}
Calendar max = new GregorianCalendar();
max.add(Calendar.YEAR, 10);
if (c.after(max))
{
return max.getTimeInMillis();
}
return c.getTimeInMillis();
}
static int dateDiff(int type, Calendar fromDate, Calendar toDate, boolean future)
{
int diff = 0;
long savedDate = fromDate.getTimeInMillis();
while ((future && !fromDate.after(toDate)) || (!future && !fromDate.before(toDate)))
{
savedDate = fromDate.getTimeInMillis();
fromDate.add(type, future ? 1 : -1);
diff++;
}
diff--;
fromDate.setTimeInMillis(savedDate);
return diff;
}
public static String formatDateDiff(long date)
{
Calendar c = new GregorianCalendar();
c.setTimeInMillis(date);
Calendar now = new GregorianCalendar();
return DateUtil.formatDateDiff(now, c);
}
public static String formatDateDiff(Calendar fromDate, Calendar toDate)
{
boolean future = false;
if (toDate.equals(fromDate))
{
return tl("now");
}
if (toDate.after(fromDate))
{
future = true;
}
StringBuilder sb = new StringBuilder();
int[] types = new int[]
{
Calendar.YEAR, Calendar.MONTH, Calendar.DAY_OF_MONTH, Calendar.HOUR_OF_DAY, Calendar.MINUTE, Calendar.SECOND
};
String[] names = new String[]
{
tl("year"), tl("years"), tl("month"), tl("months"), tl("day"), tl("days"), tl("hour"), tl("hours"), tl("minute"), tl("minutes"), tl("second"), tl("seconds")
};
int accuracy = 0;
for (int i = 0; i < types.length; i++)
{
if (accuracy > 2)
{
break;
}
int diff = dateDiff(types[i], fromDate, toDate, future);
if (diff > 0)
{
accuracy++;
sb.append(" ").append(diff).append(" ").append(names[i * 2 + (diff > 1 ? 1 : 0)]);
}
}
if (sb.length() == 0)
{
return "now";
}
return sb.toString().trim();
}
}
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