package org.bouncycastle.asn1;

import java.io.*;
import java.util.*;
import java.io.*;

/**
 * UTC time object.
 */
public class DERUTCTime
    extends DERObject
{
    String      time;

    /**
     * The correct format for this is YYMMDDHHMMSSZ (it used to be that seconds were
     * never encoded. When you're creating one of these objects from scratch, that's
     * what you want to use, otherwise we'll try to deal with whatever gets read from
     * the input stream... (this is why the input format is different from the getTime()
     * method output).
     * <p>
     *
     * @param time the time string.
     */
    public DERUTCTime(
        String  time)
    {
        this.time = time;
    }

    DERUTCTime(
        byte[]  bytes)
    {
        //
        // explicitly convert to characters
        //
        char[]  dateC = new char[bytes.length];

        for (int i = 0; i != dateC.length; i++)
        {
            dateC[i] = (char)(bytes[i] & 0xff);
        }

        this.time = new String(dateC);
    }

    /**
     * return the time - always in the form of 
     *  YYMMDDhhmmssGMT(+hh:mm|-hh:mm).
     * <p>
     * Normally in a certificate we would expect "Z" rather than "GMT",
     * however adding the "GMT" means we can just use:
     * <pre>
     *     dateF = new SimpleDateFormat("yyMMddHHmmssz");
     * </pre>
     * To read in the time and get a date which is compatible with our local
     * time zone.
     */
    public String getTime()
    {
        //
        // standardise the format.
        //
        if (time.length() == 11)
        {
            return time.substring(0, 10) + "00GMT+00:00";
        }
        else if (time.length() == 13)
        {
            return time.substring(0, 12) + "GMT+00:00";
        }
        else if (time.length() == 17)
        {
            return time.substring(0, 12) + "GMT" + time.substring(12, 15) + ":" + time.substring(15, 17);
        }

        return time;
    }

    /**
     * return the time as an adjusted date with a 4 digit year. This goes
     * in the range of 1950 - 2049.
     */
    public String getAdjustedTime()
    {
        String   d = this.getTime();

        if (d.charAt(0) < '5')
        {
            return "20" + d;
        }
        else
        {
            return "19" + d;
        }
    }

    void encode(
        DEROutputStream  out)
        throws IOException
    {
        out.writeEncoded(UTC_TIME, time.getBytes());
    }
}
