package class6_3_ObjectOrientedProgramming; // MSOE. Dr. Yoder. 07 October 2015.

import java.text.DecimalFormat;

/**
 * Models a real-world clock on the wall.
 */
public class Clock {
    public static final int MINUTES_TOP_OF_CLOCK = 60;
    /**
     * The minute part of the time (minutes past the hour). In the range 0-59.
     */
    private int minutes;
    /**
     * The hour part of the time. In the range 1-12.
     */
    private int hours;

    public final int SLEEP_TIME_MILLISECONDS = 1000;

    /**
     * Set the clock to the specified time.
     * @param hrs the hour part of the time. Must be in the range 1-12.
     * @param min the minute part of the time. Must be in the range 0-59.
     */
    public void setTime(int hrs, int min) {
        // EXERCISE: We really ought to check that hrs and min are in the
        // right range, like we do for setHours below.
        // EXERCISE 2: hrs and min aren't good variable names.
        // Can you re-write this method to use hours and minutes
        // for both the parameters and the instance variables?
        hours = hrs;
        minutes = min;
    }

    /**
     * Set the hours
     * @param hours the hour part of the time. Must be in the range 1-12.
     */
    public void setHours(int hours) { // parameter: hrs
        // IN-CLASS: Draw all of memory at this line of the program.
        if(hours <= 12 && hours> 0) {
            this.hours = hours;
        } else {
            System.err.println("Warning: Ignoring invalid time: "+hours);
        }
    }

    /**
     * Format the time as a string. For example,
     * if it is 11:15, return the string "11:15"
     */
    public String toString() {
        DecimalFormat formatter = new DecimalFormat("00");
        String formattedTime = hours+":"+formatter.format(minutes);
        return formattedTime;
    }

    /**
     * Simulate one tick of the clock: Print time, wait 1 second (to simulate 1 minute)
     * and count one minute forward.
     */
    public void tick() {
        // Print current time
        System.out.println("Time: "+this.toString());
        // Wait 1 second
        SleepHelper.sleep(SLEEP_TIME_MILLISECONDS);
        // count forward
        this.countMinuteForward();
    }

    /**
     * Count one minute forward.
     * If the minute hand reaches top of the hour,
     * wrap around to 0 and count forward one hour
     * e.g. 11:58, 11:59, 12:00.
     */
    private void countMinuteForward() {
        minutes+=1;
        if(minutes >= MINUTES_TOP_OF_CLOCK) {
            minutes=0;
            hours+=1;
            // EXERCISE: Make sure hours count over correctly, too.
        }
    }

}