/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

package jsr166;

import junit.framework.*;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class TimeUnitTest extends JSR166TestCase {

    // (loops to 88888 check increments at all time divisions.)

    /**
     * convert correctly converts sample values across the units
     */
    public void testConvert() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*60*60*24,
                         TimeUnit.SECONDS.convert(t,
                                                  TimeUnit.DAYS));
            assertEquals(t*60*60,
                         TimeUnit.SECONDS.convert(t,
                                                  TimeUnit.HOURS));
            assertEquals(t*60,
                         TimeUnit.SECONDS.convert(t,
                                                  TimeUnit.MINUTES));
            assertEquals(t,
                         TimeUnit.SECONDS.convert(t,
                                                  TimeUnit.SECONDS));
            assertEquals(t,
                         TimeUnit.SECONDS.convert(1000L*t,
                                                  TimeUnit.MILLISECONDS));
            assertEquals(t,
                         TimeUnit.SECONDS.convert(1000000L*t,
                                                  TimeUnit.MICROSECONDS));
            assertEquals(t,
                         TimeUnit.SECONDS.convert(1000000000L*t,
                                                  TimeUnit.NANOSECONDS));

            assertEquals(1000L*t*60*60*24,
                         TimeUnit.MILLISECONDS.convert(t,
                                                  TimeUnit.DAYS));
            assertEquals(1000L*t*60*60,
                         TimeUnit.MILLISECONDS.convert(t,
                                                  TimeUnit.HOURS));
            assertEquals(1000L*t*60,
                         TimeUnit.MILLISECONDS.convert(t,
                                                  TimeUnit.MINUTES));
            assertEquals(1000L*t,
                         TimeUnit.MILLISECONDS.convert(t,
                                                  TimeUnit.SECONDS));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.convert(t,
                                                  TimeUnit.MILLISECONDS));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.convert(1000L*t,
                                                  TimeUnit.MICROSECONDS));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.convert(1000000L*t,
                                                  TimeUnit.NANOSECONDS));

            assertEquals(1000000L*t*60*60*24,
                         TimeUnit.MICROSECONDS.convert(t,
                                                  TimeUnit.DAYS));
            assertEquals(1000000L*t*60*60,
                         TimeUnit.MICROSECONDS.convert(t,
                                                  TimeUnit.HOURS));
            assertEquals(1000000L*t*60,
                         TimeUnit.MICROSECONDS.convert(t,
                                                  TimeUnit.MINUTES));
            assertEquals(1000000L*t,
                         TimeUnit.MICROSECONDS.convert(t,
                                                  TimeUnit.SECONDS));
            assertEquals(1000L*t,
                         TimeUnit.MICROSECONDS.convert(t,
                                                  TimeUnit.MILLISECONDS));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.convert(t,
                                                  TimeUnit.MICROSECONDS));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.convert(1000L*t,
                                                  TimeUnit.NANOSECONDS));

            assertEquals(1000000000L*t*60*60*24,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.DAYS));
            assertEquals(1000000000L*t*60*60,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.HOURS));
            assertEquals(1000000000L*t*60,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.MINUTES));
            assertEquals(1000000000L*t,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.SECONDS));
            assertEquals(1000000L*t,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.MILLISECONDS));
            assertEquals(1000L*t,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.MICROSECONDS));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.convert(t,
                                                  TimeUnit.NANOSECONDS));
        }
    }

    /**
     * toNanos correctly converts sample values in different units to
     * nanoseconds
     */
    public void testToNanos() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*1000000000L*60*60*24,
                         TimeUnit.DAYS.toNanos(t));
            assertEquals(t*1000000000L*60*60,
                         TimeUnit.HOURS.toNanos(t));
            assertEquals(t*1000000000L*60,
                         TimeUnit.MINUTES.toNanos(t));
            assertEquals(1000000000L*t,
                         TimeUnit.SECONDS.toNanos(t));
            assertEquals(1000000L*t,
                         TimeUnit.MILLISECONDS.toNanos(t));
            assertEquals(1000L*t,
                         TimeUnit.MICROSECONDS.toNanos(t));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toNanos(t));
        }
    }

    /**
     * toMicros correctly converts sample values in different units to
     * microseconds
     */
    public void testToMicros() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*1000000L*60*60*24,
                         TimeUnit.DAYS.toMicros(t));
            assertEquals(t*1000000L*60*60,
                         TimeUnit.HOURS.toMicros(t));
            assertEquals(t*1000000L*60,
                         TimeUnit.MINUTES.toMicros(t));
            assertEquals(1000000L*t,
                         TimeUnit.SECONDS.toMicros(t));
            assertEquals(1000L*t,
                         TimeUnit.MILLISECONDS.toMicros(t));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.toMicros(t));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toMicros(t*1000L));
        }
    }

    /**
     * toMillis correctly converts sample values in different units to
     * milliseconds
     */
    public void testToMillis() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*1000L*60*60*24,
                         TimeUnit.DAYS.toMillis(t));
            assertEquals(t*1000L*60*60,
                         TimeUnit.HOURS.toMillis(t));
            assertEquals(t*1000L*60,
                         TimeUnit.MINUTES.toMillis(t));
            assertEquals(1000L*t,
                         TimeUnit.SECONDS.toMillis(t));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.toMillis(t));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.toMillis(t*1000L));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toMillis(t*1000000L));
        }
    }

    /**
     * toSeconds correctly converts sample values in different units to
     * seconds
     */
    public void testToSeconds() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*60*60*24,
                         TimeUnit.DAYS.toSeconds(t));
            assertEquals(t*60*60,
                         TimeUnit.HOURS.toSeconds(t));
            assertEquals(t*60,
                         TimeUnit.MINUTES.toSeconds(t));
            assertEquals(t,
                         TimeUnit.SECONDS.toSeconds(t));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.toSeconds(t*1000L));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.toSeconds(t*1000000L));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toSeconds(t*1000000000L));
        }
    }

    /**
     * toMinutes correctly converts sample values in different units to
     * minutes
     */
    public void testToMinutes() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*60*24,
                         TimeUnit.DAYS.toMinutes(t));
            assertEquals(t*60,
                         TimeUnit.HOURS.toMinutes(t));
            assertEquals(t,
                         TimeUnit.MINUTES.toMinutes(t));
            assertEquals(t,
                         TimeUnit.SECONDS.toMinutes(t*60));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.toMinutes(t*1000L*60));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.toMinutes(t*1000000L*60));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toMinutes(t*1000000000L*60));
        }
    }

    /**
     * toHours correctly converts sample values in different units to
     * hours
     */
    public void testToHours() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t*24,
                         TimeUnit.DAYS.toHours(t));
            assertEquals(t,
                         TimeUnit.HOURS.toHours(t));
            assertEquals(t,
                         TimeUnit.MINUTES.toHours(t*60));
            assertEquals(t,
                         TimeUnit.SECONDS.toHours(t*60*60));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.toHours(t*1000L*60*60));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.toHours(t*1000000L*60*60));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toHours(t*1000000000L*60*60));
        }
    }

    /**
     * toDays correctly converts sample values in different units to
     * days
     */
    public void testToDays() {
        for (long t = 0; t < 88888; ++t) {
            assertEquals(t,
                         TimeUnit.DAYS.toDays(t));
            assertEquals(t,
                         TimeUnit.HOURS.toDays(t*24));
            assertEquals(t,
                         TimeUnit.MINUTES.toDays(t*60*24));
            assertEquals(t,
                         TimeUnit.SECONDS.toDays(t*60*60*24));
            assertEquals(t,
                         TimeUnit.MILLISECONDS.toDays(t*1000L*60*60*24));
            assertEquals(t,
                         TimeUnit.MICROSECONDS.toDays(t*1000000L*60*60*24));
            assertEquals(t,
                         TimeUnit.NANOSECONDS.toDays(t*1000000000L*60*60*24));
        }
    }

    /**
     * convert saturates positive too-large values to Long.MAX_VALUE
     * and negative to LONG.MIN_VALUE
     */
    public void testConvertSaturate() {
        assertEquals(Long.MAX_VALUE,
                     TimeUnit.NANOSECONDS.convert(Long.MAX_VALUE / 2,
                                                  TimeUnit.SECONDS));
        assertEquals(Long.MIN_VALUE,
                     TimeUnit.NANOSECONDS.convert(-Long.MAX_VALUE / 4,
                                                  TimeUnit.SECONDS));
        assertEquals(Long.MAX_VALUE,
                     TimeUnit.NANOSECONDS.convert(Long.MAX_VALUE / 2,
                                                  TimeUnit.MINUTES));
        assertEquals(Long.MIN_VALUE,
                     TimeUnit.NANOSECONDS.convert(-Long.MAX_VALUE / 4,
                                                  TimeUnit.MINUTES));
        assertEquals(Long.MAX_VALUE,
                     TimeUnit.NANOSECONDS.convert(Long.MAX_VALUE / 2,
                                                  TimeUnit.HOURS));
        assertEquals(Long.MIN_VALUE,
                     TimeUnit.NANOSECONDS.convert(-Long.MAX_VALUE / 4,
                                                  TimeUnit.HOURS));
        assertEquals(Long.MAX_VALUE,
                     TimeUnit.NANOSECONDS.convert(Long.MAX_VALUE / 2,
                                                  TimeUnit.DAYS));
        assertEquals(Long.MIN_VALUE,
                     TimeUnit.NANOSECONDS.convert(-Long.MAX_VALUE / 4,
                                                  TimeUnit.DAYS));
    }

    /**
     * toNanos saturates positive too-large values to Long.MAX_VALUE
     * and negative to LONG.MIN_VALUE
     */
    public void testToNanosSaturate() {
        assertEquals(Long.MAX_VALUE,
                     TimeUnit.MILLISECONDS.toNanos(Long.MAX_VALUE / 2));
        assertEquals(Long.MIN_VALUE,
                     TimeUnit.MILLISECONDS.toNanos(-Long.MAX_VALUE / 3));
    }

    /**
     * toString returns name of unit
     */
    public void testToString() {
        assertEquals("SECONDS", TimeUnit.SECONDS.toString());
    }

    /**
     * name returns name of unit
     */
    public void testName() {
        assertEquals("SECONDS", TimeUnit.SECONDS.name());
    }

    /**
     * Timed wait without holding lock throws
     * IllegalMonitorStateException
     */
    public void testTimedWait_IllegalMonitorException() {
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Object o = new Object();
                TimeUnit tu = TimeUnit.MILLISECONDS;

                try {
                    tu.timedWait(o, LONG_DELAY_MS);
                    threadShouldThrow();
                } catch (IllegalMonitorStateException success) {}
            }});

        awaitTermination(t);
    }

    /**
     * timedWait throws InterruptedException when interrupted
     */
    public void testTimedWait_Interruptible() {
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Object o = new Object();
                TimeUnit tu = TimeUnit.MILLISECONDS;

                Thread.currentThread().interrupt();
                try {
                    synchronized (o) {
                        tu.timedWait(o, LONG_DELAY_MS);
                    }
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());

                pleaseInterrupt.countDown();
                try {
                    synchronized (o) {
                        tu.timedWait(o, LONG_DELAY_MS);
                    }
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());
            }});

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
    }

    /**
     * timedJoin throws InterruptedException when interrupted
     */
    public void testTimedJoin_Interruptible() {
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        final Thread s = newStartedThread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                Thread.sleep(LONG_DELAY_MS);
            }});
        final Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                TimeUnit tu = TimeUnit.MILLISECONDS;
                Thread.currentThread().interrupt();
                try {
                    tu.timedJoin(s, LONG_DELAY_MS);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());

                pleaseInterrupt.countDown();
                try {
                    tu.timedJoin(s, LONG_DELAY_MS);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());
            }});

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
        s.interrupt();
        awaitTermination(s);
    }

    /**
     * timedSleep throws InterruptedException when interrupted
     */
    public void testTimedSleep_Interruptible() {
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                TimeUnit tu = TimeUnit.MILLISECONDS;
                Thread.currentThread().interrupt();
                try {
                    tu.sleep(LONG_DELAY_MS);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());

                pleaseInterrupt.countDown();
                try {
                    tu.sleep(LONG_DELAY_MS);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());
            }});

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
    }

    /**
     * a deserialized serialized unit is the same instance
     */
    public void testSerialization() throws Exception {
        TimeUnit x = TimeUnit.MILLISECONDS;
        assertSame(x, serialClone(x));
    }

}