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package net.sourceforge.cruisecontrol.dashboard.utils;

import java.text.SimpleDateFormat;
import java.util.Locale;

import net.sourceforge.cruisecontrol.util.DateUtil;

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

public final class CCDateFormatter {

    private static final int DATE_START = 3;

    private static final int DATE_END = 17;

    private static final int MILLONS_OF_DAY = 1000 * 3600 * 24;

    private static DateTimeFormatter yyyyMMddHHmmssPattern = DateTimeFormat.forPattern("yyyyMMddHHmmss");

    private static SimpleDateFormat yyyyMMddHHmmssSimpleDateFormat =
        new SimpleDateFormat("yyyyMMddHHmmss", Locale.ENGLISH);

    private CCDateFormatter() {
    }

    public static String duration(long timeSpan) {
        String when = timeSpan > 0 ? "ago" : "later";
        long days = timeSpan / CCDateFormatter.MILLONS_OF_DAY;
        String daysString = days == 0 ? "" : days + " days ";
        String remaining = DateUtil.formatTime(timeSpan - days * CCDateFormatter.MILLONS_OF_DAY);
        String space = remaining.endsWith(" ") ? "" : " ";
        return daysString + remaining + space + when;
    }

    public static String getDateStringInHumanBeingReadingStyle(DateTime date) {
        String dateString = getDateFormatterWithTimeZone().format(date.toDate());
        int colonPlace = dateString.length() - 2;
        return dateString.substring(0, colonPlace) + ":" + dateString.substring(colonPlace);
    }

    private static SimpleDateFormat getDateFormatterWithTimeZone() {
        return new SimpleDateFormat("d MMM yyyy HH:mm 'GMT' Z", Locale.ENGLISH);
    }

    public static String yyyyMMddHHmmss(DateTime date) {
        return yyyyMMddHHmmssSimpleDateFormat.format(date.toDate());
    }

    public static DateTime format(String datetime, String dateFormat) {
        return DateTimeFormat.forPattern(dateFormat).parseDateTime(datetime);
    }

    public static String format(DateTime datetime, String format) {
        return new SimpleDateFormat(format, Locale.ENGLISH).format(datetime.toDate());
    }

    public static DateTime formatLogName(String logFileName) {
        return yyyyMMddHHmmssPattern.parseDateTime(getBuildDateFromLogFileName(logFileName));
    }

    public static String getBuildDateFromLogFileName(String logFileName) {
        return logFileName.substring(DATE_START, DATE_END);
    }

    public static DateTime iso8601(String datetime) {
        try {
            return new DateTime(DateUtil.parseIso8601(datetime).getTime(),
                    DateTimeZone.forOffsetHours(0));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}