/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST


LIBNORMALFORM_SENTENCE *
(libnormalform_imply)(LIBNORMALFORM_SENTENCE **xs)
{
	LIBNORMALFORM_SENTENCE *t;
	size_t n = 0, i;

	while (xs[n])
		n += 1;

	if (!n) {
		/* 1 → x = x and 0 → x = 1 */
		return libnormalform_true();
	}

	/* a → b → c = a → (b → c) = (b → c) ← a = (c ← b) ← a = c ← b ← a */
	for (i = 0; i < n--; i++) {
		t = xs[i];
		xs[i] = xs[n];
		xs[n] = t;
	}
	return libnormalform_if(xs);
}


#else


#define IMPLY(...) LIBNORMALFORM_IMPLY(__VA_ARGS__)


int
main(void)
{
	struct libnormalform_variable var1, var2, var3;
	LIBNORMALFORM_SENTENCE *a, *b, *v1, *v2, *v3;
	LIBNORMALFORM_SENTENCE *ts, *fs;

	ASSUME(v1 = libnormalform_variable(&var1));
	ASSUME(v2 = libnormalform_variable(&var2));
	ASSUME(v3 = libnormalform_variable(&var3));
	ASSUME(ts = libnormalform_true());
	ASSUME(fs = libnormalform_false());

#ifdef USE_CHECKED_VERSION
	errno = 0;
	ASSERT(!IMPLY(REF(v1), NULL) && errno == 0);
	errno = 1;
	ASSERT(!IMPLY(REF(v1), NULL) && errno == 1);
	errno = 0;
	ASSERT(!IMPLY(NULL, REF(v1)) && errno == 0);
	errno = 1;
	ASSERT(!IMPLY(NULL, REF(v1)) && errno == 1);
	errno = 0;
	ASSERT(!IMPLY(NULL, NULL) && errno == 0);
	errno = 1;
	ASSERT(!IMPLY(NULL, NULL) && errno == 1);
#endif

#define T REF(ts)
#define F REF(fs)
#define TV LIBNORMALFORM_TRUE
#define FV LIBNORMALFORM_FALSE

#define ASSERT_CONST(VALUE, ...)\
	do {\
		ASSUME(a = IMPLY(__VA_ARGS__));\
		ASSERT(a->type == TYPE_##VALUE);\
		libnormalform_free(a);\
	} while (0)

#define ASSERT_EVAL2(VALUE, V1, V2)\
	do {\
		ASSUME(a = IMPLY(REF(v1), REF(v2)));\
		ASSERT(a->type != TYPE_TRUE && a->type != TYPE_FALSE);\
		var1.value = V1##V;\
		var2.value = V2##V;\
		ASSERT(libnormalform_evaluate(a) == (int)LIBNORMALFORM_##VALUE);\
		libnormalform_free(a);\
	} while (0)

#ifndef USE_TWO

#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wformat"
#endif

	ASSERT_CONST(TRUE); /* IMPLY () -> TRUE */

#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif

	ASSERT_CONST(TRUE, T);  /* IMPLY (TRUE) -> TRUE */
	ASSERT_CONST(FALSE, F); /* IMPLY (FALSE) -> FALSE */

#endif

	ASSERT_CONST(TRUE,  F, F); /* IMPLY (FALSE, FALSE) -> TRUE */
	ASSERT_CONST(TRUE,  F, T); /* IMPLY (FALSE, TRUE) -> TRUE */
	ASSERT_CONST(FALSE, T, F); /* IMPLY (TRUE, FALSE) -> FALSE */
	ASSERT_CONST(TRUE,  T, T); /* IMPLY (TRUE, TRUE) -> TRUE */

	ASSERT_EVAL2(TRUE,  F, F); /* IMPLY (var(FALSE), var(FALSE)) => TRUE */
	ASSERT_EVAL2(TRUE,  F, T); /* IMPLY (var(FALSE), var(TRUE)) => TRUE */
	ASSERT_EVAL2(FALSE, T, F); /* IMPLY (var(TRUE), var(FALSE)) => FALSE */
	ASSERT_EVAL2(TRUE,  T, T); /* IMPLY (var(TRUE), var(TRUE)) => TRUE */

#ifndef USE_TWO

	/* IMPLY (x) -> x */
	ASSUME(a = IMPLY(REF(v1)));
	ASSERT(a == v1);
	ASSERT(a->refcount == 2);
	libnormalform_free(a);

#endif

	/* IMPLY (x, y) -> IF (y, x) */
	ASSUME(a = IMPLY(REF(v1), REF(v2)));
	ASSUME(b = libnormalform_if2(REF(v2), REF(v1)));
	ASSERT_EQUAL(a, b);
	libnormalform_free(a);
	libnormalform_free(b);

#ifndef USE_TWO

	/* IMPLY (x, y, z) -> IF (z, y, x) */
	ASSUME(a = IMPLY(REF(v1), REF(v2), REF(v3)));
	ASSUME(b = libnormalform_ifl(REF(v3), REF(v2), REF(v1), NULL));
	ASSERT_EQUAL(a, b);
	libnormalform_free(a);
	libnormalform_free(b);

	/* IMPLY (x, y) -> independence from IMPLY (y, x) */
	ASSUME(a = IMPLY(REF(v1), REF(v2)));
	ASSUME(b = IMPLY(REF(v2), REF(v1)));
	ASSERT_NOTEQUAL(a, b);
	libnormalform_free(a);
	libnormalform_free(b);

#endif

#undef T
#undef F
#undef TV
#undef FV

#undef ASSERT_CONST
#undef ASSERT_EVAL2

	libnormalform_free(v1);
	libnormalform_free(v2);
	libnormalform_free(v3);
	libnormalform_free(ts);
	libnormalform_free(fs);
	return 0;
}


#endif