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/* Copyright 2016 Google Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License. */

#include "platform.h"
#include "nsync.h"
#include "time_extra.h"
#include "smprintf.h"
#include "closure.h"
#include "testing.h"

NSYNC_CPP_USING_

/* Verify the properties of a zero counter. */
static void test_counter_zero (testing t) {
	int i;
	nsync_counter c = nsync_counter_new (0);
	for (i = 0; i != 2; i++) {
		if (nsync_counter_value (c) != 0) {
			TEST_ERROR (t, ("zero counter is not zero (test, %d)", i));
		}
		if (nsync_counter_wait (c, nsync_time_zero) != 0) {
			TEST_ERROR (t, ("zero counter is not zero (poll, %d)", i));
		}
		if (nsync_counter_wait (c, nsync_time_no_deadline) != 0) {
			TEST_ERROR (t, ("zero counter is not zero (infinite wait, %d)", i));
		}
		nsync_counter_add (c, 0);
	}
	nsync_counter_free (c);
}


/* Verify the properties of a non-zero counter. */
static void test_counter_non_zero (testing t) {
	nsync_time start;
	nsync_time waited;
	nsync_time abs_deadline;
	nsync_counter c = nsync_counter_new (1);
	if (nsync_counter_value (c) != 1) {
		TEST_ERROR (t, ("counter is not 1 (test)"));
	}
	if (nsync_counter_wait (c, nsync_time_zero) != 1) {
		TEST_ERROR (t, ("counter is not 1 (poll)"));
	}
	start = nsync_time_now ();
	abs_deadline = nsync_time_add (nsync_time_now (), nsync_time_ms (1000));
	if (nsync_counter_wait (c, abs_deadline) != 1) {
		TEST_ERROR (t, ("counter is not 1 (1s wait)"));
	}
	waited = nsync_time_sub (nsync_time_now (), start);
	if (nsync_time_cmp (waited, nsync_time_ms (900)) < 0) {
		TEST_ERROR (t, ("timed wait on non-zero counter returned too quickly (1s wait took %s)",
			   nsync_time_str (waited, 2)));
	}
	if (nsync_time_cmp (waited, nsync_time_ms (2000)) > 0) {
		TEST_ERROR (t, ("timed wait on non-zero counter returned too slowly (1s wait took %s)",
			   nsync_time_str (waited, 2)));
	}

	if (nsync_counter_add (c, -1) != 0) {
		TEST_ERROR (t, ("zero counter note is not 0 (add)"));
	}

	if (nsync_counter_value (c) != 0) {
		TEST_ERROR (t, ("zero counter note is not 0 (test)"));
	}
	if (nsync_counter_wait (c, nsync_time_zero) != 0) {
		TEST_ERROR (t, ("zero counter note is not 0 (poll)"));
	}
	if (nsync_counter_wait (c, nsync_time_no_deadline) != 0) {
		TEST_ERROR (t, ("zero counter note is not 0 (infinite wait)"));
	}
	nsync_counter_free (c);
}

static void decrement_at (nsync_counter c, nsync_time abs_deadline) {
	nsync_time_sleep_until (abs_deadline);
	nsync_counter_add (c, -1);
}

CLOSURE_DECL_BODY2 (decrement, nsync_counter, nsync_time)

/* Test decrement of a counter. */
static void test_counter_decrement (testing t) {
	nsync_time start;
	nsync_time waited;
	nsync_counter c = nsync_counter_new (1);
	closure_fork (closure_decrement (&decrement_at, c,
		nsync_time_add (nsync_time_now (), nsync_time_ms (1000))));
	start = nsync_time_now ();
	if (nsync_counter_wait (c, nsync_time_no_deadline) != 0) {
		TEST_ERROR (t, ("counter is not 0"));
	}
	waited = nsync_time_sub (nsync_time_now (), start);
	if (nsync_time_cmp (waited, nsync_time_ms (900)) < 0) {
		TEST_ERROR (t, ("counter wait too fast (1s delay took %s)", nsync_time_str (waited, 2)));
	}
	if (nsync_time_cmp (waited, nsync_time_ms (2000)) > 0) {
		TEST_ERROR (t, ("counter wait too slow (1s delay took %s)", nsync_time_str (waited, 2)));
	}
	if (nsync_counter_value (c) != 0) {
		TEST_ERROR (t, ("counter is not 0 (test)"));
	}
	if (nsync_counter_wait (c, nsync_time_zero) != 0) {
		TEST_ERROR (t, ("counter is not 0 (poll)"));
	}
	if (nsync_counter_wait (c, nsync_time_no_deadline) != 0) {
		TEST_ERROR (t, ("counter is not 0 (infinite wait)"));
	}
	nsync_counter_free (c);

	c = nsync_counter_new (1);
	closure_fork (closure_decrement (&decrement_at, c,
		nsync_time_add (nsync_time_now (), nsync_time_ms (1000))));
	start = nsync_time_now ();
	while (nsync_counter_value (c) != 0) {
		nsync_time_sleep (nsync_time_ms (10));
	}
	waited = nsync_time_sub (nsync_time_now (), start);
	if (nsync_time_cmp (waited, nsync_time_ms (900)) < 0) {
		TEST_ERROR (t, ("counter wait too fast (1s delay took %s)", nsync_time_str (waited, 2)));
	}
	if (nsync_time_cmp (waited, nsync_time_ms (2000)) > 0) {
		TEST_ERROR (t, ("counter wait too slow (1s delay took %s)", nsync_time_str (waited, 2)));
	}
	if (nsync_counter_value (c) != 0) {
		TEST_ERROR (t, ("counter is not 0 (test)"));
	}
	if (nsync_counter_wait (c, nsync_time_zero) != 0) {
		TEST_ERROR (t, ("counter is not 0 (poll)"));
	}
	if (nsync_counter_wait (c, nsync_time_no_deadline) != 0) {
		TEST_ERROR (t, ("counter is not 0 (infinite wait)"));
	}
	nsync_counter_free (c);
}

int main (int argc, char *argv[]) {
	testing_base tb = testing_new (argc, argv, 0);
	TEST_RUN (tb, test_counter_zero);
	TEST_RUN (tb, test_counter_non_zero);
	TEST_RUN (tb, test_counter_decrement);
	return (testing_base_exit (tb));
}