/*

    TUIO Java backend - part of the reacTIVision project

    http://reactivision.sourceforge.net/

    Copyright (c) 2005-2009 Martin Kaltenbrunner <mkalten@iua.upf.edu>

    /**

     * the time since session start in seconds  

     */ 

    private long seconds = 0;

    /**

     * time fraction in microseconds  

     */ 

    private long  micro_seconds = 0;

    /**

     * the session start time in seconds

     */ 

    private static long start_seconds = 0;

    /**

     * start time fraction in microseconds

     */ 

    private static long start_micro_seconds = 0;

    /**

     * The default constructor takes no arguments and sets   

     * the Seconds and Microseconds attributes of the newly created TuioTime both to zero.

     */

    public TuioTime () {

        this.seconds = 0;

        this.micro_seconds = 0;

    }

    /**

     * This constructor takes the provided time represented in total Milliseconds 

     * and assigs this value to the newly created TuioTime.

     *

     * @param  msec  the total time in Millseconds

     */

    public TuioTime (long msec) {

        this.seconds = msec/1000;

        this.micro_seconds = 1000*(msec%1000);

    }

    /**

     * This constructor takes the provided time represented in Seconds and Microseconds   

     * and assigs these value to the newly created TuioTime.

     *

     * @param  sec  the total time in seconds

     * @param  usec    the microseconds time component

     */    

    public TuioTime (long sec, long usec) {

        this.seconds = sec;

        this.micro_seconds = usec;

    }

    /**

     * This constructor takes the provided TuioTime   

     * and assigs its Seconds and Microseconds values to the newly created TuioTime.

     *

     * @param  ttime  the TuioTime used to copy

     */    

    public TuioTime (TuioTime ttime) {

        this.seconds = ttime.getSeconds();

        this.micro_seconds = ttime.getMicroseconds();

    }

    /**

     * Sums the provided time value represented in total Microseconds to this TuioTime.

     *

     * @param  us    the total time to add in Microseconds

     * @return the sum of this TuioTime with the provided argument in microseconds

    */    

    public TuioTime add(long us) {

        long sec = seconds + us/1000000;

        long usec = micro_seconds + us%1000000;

        return new TuioTime(sec,usec);

    }

    /**

     * Sums the provided TuioTime to the private Seconds and Microseconds attributes.  

     *

     * @param  ttime    the TuioTime to add

     * @return the sum of this TuioTime with the provided TuioTime argument

     */

    public TuioTime add(TuioTime ttime) {

        long sec = seconds + ttime.getSeconds();

        long usec = micro_seconds + ttime.getMicroseconds();

        sec += usec/1000000;

        usec = usec%1000000;

        return new TuioTime(sec,usec);

    }

    /**

     * Subtracts the provided time represented in Microseconds from the private Seconds and Microseconds attributes.

     *

     * @param  us    the total time to subtract in Microseconds

     * @return the subtraction result of this TuioTime minus the provided time in Microseconds

     */        

    public TuioTime subtract(long us) {

        long sec = seconds - us/1000000;

        long usec = micro_seconds - us%1000000;

        if (usec<0) {

            usec += 1000000;

            sec--;

        }            

        return new TuioTime(sec,usec);

    }

    /**

     * Subtracts the provided TuioTime from the private Seconds and Microseconds attributes.

     *

     * @param  ttime    the TuioTime to subtract

     * @return the subtraction result of this TuioTime minus the provided TuioTime

     */    

    public TuioTime subtract(TuioTime ttime) {

        long sec = seconds - ttime.getSeconds();

        long usec = micro_seconds - ttime.getMicroseconds();

        if (usec<0) {

            usec += 1000000;

            sec--;

        }

        return new TuioTime(sec,usec);

    }

    /**

     * Takes a TuioTime argument and compares the provided TuioTime to the private Seconds and Microseconds attributes.

     *

     * @param  ttime    the TuioTime to compare

     * @return true if the two TuioTime have equal Seconds and Microseconds attributes

     */    

    public boolean equals(TuioTime ttime) {

        if ((seconds==ttime.getSeconds()) && (micro_seconds==ttime.getMicroseconds())) return true;

        else return false;

    }

    /**

     * Resets the seconds and micro_seconds attributes to zero.

     */

    public void reset() {

        seconds = 0;

        micro_seconds = 0;

    }

    /**

     * Returns the TuioTime Seconds component.

     * @return the TuioTime Seconds component

     */    

    public long getSeconds() {

        return seconds;

    }

    /**

     * Returns the TuioTime Microseconds component.

     * @return the TuioTime Microseconds component

     */    

    public long getMicroseconds() {

        return micro_seconds;

    }

    /**

     * Returns the total TuioTime in Milliseconds.

     * @return the total TuioTime in Milliseconds

     */    

    public long getTotalMilliseconds() {

        return seconds*1000+micro_seconds/1000;

    }

    /**

     * This static method globally resets the TUIO session time.

     */        

    public static void initSession() {

        TuioTime startTime = getSystemTime();

        start_seconds = startTime.getSeconds();

        start_micro_seconds = startTime.getMicroseconds();

    }

    /**

     * Returns the present TuioTime representing the time since session start.

     * @return the present TuioTime representing the time since session start

     */    

    public static TuioTime getSessionTime() {

        TuioTime sessionTime = getSystemTime().subtract(getStartTime());

        return sessionTime;

    }

    /**

     * Returns the absolut TuioTime representing the session start.

     * @return the absolut TuioTime representing the session start

     */    

    public static TuioTime getStartTime() {

        return new TuioTime(start_seconds,start_micro_seconds);

    }

    /**

     * Returns the absolut TuioTime representing the current system time.

     * @return the absolut TuioTime representing the current system time

     */    

    public static TuioTime getSystemTime() {

        long usec = System.nanoTime()/1000;

        return new TuioTime(usec/1000000,usec%1000000);

    }