/*-
 * Copyright (c) 2004 Nik Clayton
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include "tap.h"

static int no_plan = 0;
static int skip_all = 0;
static int have_plan = 0;
static unsigned int test_count = 0; /* Number of tests that have been run */
static unsigned int e_tests = 0;    /* Expected number of tests to run */
static unsigned int failures = 0;   /* Number of tests that failed */
static char *todo_msg = NULL;
static char *todo_msg_fixed = "libtap malloc issue";
static int todo = 0;
static int test_died = 0;

/* Encapsulate the pthread code in a conditional.  In the absence of
   libpthread the code does nothing */
#ifdef HAVE_LIBPTHREAD
#	include <pthread.h>
static pthread_mutex_t M = PTHREAD_MUTEX_INITIALIZER;
#	define LOCK   pthread_mutex_lock(&M);
#	define UNLOCK pthread_mutex_unlock(&M);
#else
#	define LOCK
#	define UNLOCK
#endif

static void _expected_tests(unsigned int);
static void _tap_init(void);
static void _cleanup(void);

/*
 * Generate a test result.
 *
 * ok -- boolean, indicates whether or not the test passed.
 * test_name -- the name of the test, may be NULL
 * test_comment -- a comment to print afterwards, may be NULL
 */
unsigned int _gen_result(int ok, const char *func, char *file, unsigned int line, char *test_name, ...) {
	va_list ap;
	char *local_test_name = NULL;
	char *c;
	int name_is_digits;

	LOCK;

	test_count++;

	/* Start by taking the test name and performing any printf()
	   expansions on it */
	if (test_name != NULL) {
		va_start(ap, test_name);
		vasprintf(&local_test_name, test_name, ap);
		va_end(ap);

		/* Make sure the test name contains more than digits
		   and spaces.  Emit an error message and exit if it
		   does */
		if (local_test_name) {
			name_is_digits = 1;
			for (c = local_test_name; *c != '\0'; c++) {
				if (!isdigit(*c) && !isspace(*c)) {
					name_is_digits = 0;
					break;
				}
			}

			if (name_is_digits) {
				diag("    You named your test '%s'.  You shouldn't use numbers for your test names.", local_test_name);
				diag("    Very confusing.");
			}
		}
	}

	if (!ok) {
		printf("not ");
		failures++;
	}

	printf("ok %d", test_count);

	if (test_name != NULL) {
		printf(" - ");

		/* Print the test name, escaping any '#' characters it
		   might contain */
		if (local_test_name != NULL) {
			flockfile(stdout);
			for (c = local_test_name; *c != '\0'; c++) {
				if (*c == '#')
					fputc('\\', stdout);
				fputc((int)*c, stdout);
			}
			funlockfile(stdout);
		} else { /* vasprintf() failed, use a fixed message */
			printf("%s", todo_msg_fixed);
		}
	}

	/* If we're in a todo_start() block then flag the test as being
	   TODO.  todo_msg should contain the message to print at this
	   point.  If it's NULL then asprintf() failed, and we should
	   use the fixed message.

	   This is not counted as a failure, so decrement the counter if
	   the test failed. */
	if (todo) {
		printf(" # TODO %s", todo_msg ? todo_msg : todo_msg_fixed);
		if (!ok)
			failures--;
	}

	printf("\n");

	if (!ok)
		diag("    Failed %stest (%s:%s() at line %d)", todo ? "(TODO) " : "", file, func, line);

	free(local_test_name);

	UNLOCK;

	/* We only care (when testing) that ok is positive, but here we
	   specifically only want to return 1 or 0 */
	return ok ? 1 : 0;
}

/*
 * Initialise the TAP library.  Will only do so once, however many times it's
 * called.
 */
void _tap_init(void) {
	static int run_once = 0;

	LOCK;

	if (!run_once) {
		atexit(_cleanup);

		/* stdout needs to be unbuffered so that the output appears
		   in the same place relative to stderr output as it does
		   with Test::Harness */
		setbuf(stdout, 0);
		run_once = 1;
	}

	UNLOCK;
}

/*
 * Note that there's no plan.
 */
int plan_no_plan(void) {

	LOCK;

	_tap_init();

	if (have_plan != 0) {
		fprintf(stderr, "You tried to plan twice!\n");
		test_died = 1;
		UNLOCK;
		exit(255);
	}

	have_plan = 1;
	no_plan = 1;

	UNLOCK;

	return 0;
}

/*
 * Note that the plan is to skip all tests
 */
int plan_skip_all(char *reason) {

	LOCK;

	_tap_init();

	skip_all = 1;

	printf("1..0");

	if (reason != NULL)
		printf(" # Skip %s", reason);

	printf("\n");

	UNLOCK;

	exit(0);
}

/*
 * Note the number of tests that will be run.
 */
int plan_tests(unsigned int tests) {

	LOCK;

	_tap_init();

	if (have_plan != 0) {
		fprintf(stderr, "You tried to plan twice!\n");
		test_died = 1;
		UNLOCK;
		exit(255);
	}

	if (tests == 0) {
		fprintf(stderr, "You said to run 0 tests!  You've got to run something.\n");
		test_died = 1;
		UNLOCK;
		exit(255);
	}

	have_plan = 1;

	_expected_tests(tests);

	UNLOCK;

	return 0;
}

unsigned int diag(char *fmt, ...) {
	va_list ap;

	LOCK;

	fputs("# ", stderr);

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);

	fputs("\n", stderr);

	UNLOCK;

	return 0;
}

void _expected_tests(unsigned int tests) {

	LOCK;

	printf("1..%d\n", tests);
	e_tests = tests;

	UNLOCK;
}

int skip(unsigned int n, char *fmt, ...) {
	va_list ap;
	char *skip_msg;

	LOCK;

	va_start(ap, fmt);
	asprintf(&skip_msg, fmt, ap);
	va_end(ap);

	while (n-- > 0) {
		test_count++;
		printf("ok %d # skip %s\n", test_count, skip_msg != NULL ? skip_msg : "libtap():malloc() failed");
	}

	free(skip_msg);

	UNLOCK;

	return 1;
}

void todo_start(char *fmt, ...) {
	va_list ap;

	LOCK;

	va_start(ap, fmt);
	vasprintf(&todo_msg, fmt, ap);
	va_end(ap);

	todo = 1;

	UNLOCK;
}

void todo_end(void) {

	LOCK;

	todo = 0;
	free(todo_msg);

	UNLOCK;
}

int exit_status(void) {
	int r;

	LOCK;

	/* If there's no plan, just return the number of failures */
	if (no_plan || !have_plan) {
		UNLOCK;
		return failures;
	}

	/* Ran too many tests?  Return the number of tests that were run
	   that shouldn't have been */
	if (e_tests < test_count) {
		r = test_count - e_tests;
		UNLOCK;
		return r;
	}

	/* Return the number of tests that failed + the number of tests
	   that weren't run */
	r = failures + e_tests - test_count;
	UNLOCK;

	return r;
}

/*
 * Cleanup at the end of the run, produce any final output that might be
 * required.
 */
void _cleanup(void) {

	LOCK;

	/* If plan_no_plan() wasn't called, and we don't have a plan,
	   and we're not skipping everything, then something happened
	   before we could produce any output */
	if (!no_plan && !have_plan && !skip_all) {
		diag("Looks like your test died before it could output anything.");
		UNLOCK;
		return;
	}

	if (test_died) {
		diag("Looks like your test died just after %d.", test_count);
		UNLOCK;
		return;
	}

	/* No plan provided, but now we know how many tests were run, and can
	   print the header at the end */
	if (!skip_all && (no_plan || !have_plan)) {
		printf("1..%d\n", test_count);
	}

	if ((have_plan && !no_plan) && e_tests < test_count) {
		diag("Looks like you planned %d tests but ran %d extra.", e_tests, test_count - e_tests);
		UNLOCK;
		return;
	}

	if ((have_plan || !no_plan) && e_tests > test_count) {
		diag("Looks like you planned %d tests but only ran %d.", e_tests, test_count);
		UNLOCK;
		return;
	}

	if (failures)
		diag("Looks like you failed %d tests of %d.", failures, test_count);

	UNLOCK;
}