/*
 * This library is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

#include "camel-test.h"

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>

/* well i dunno, doesn't seem to be in the headers but hte manpage mentions it */
/* a nonportable checking mutex for glibc, not really needed, just validates
 * the test harness really */
static GMutex lock;
#define CAMEL_TEST_LOCK g_mutex_lock(&lock)
#define CAMEL_TEST_UNLOCK g_mutex_unlock(&lock)
#define CAMEL_TEST_ID (g_thread_self())

static gint setup;
static gint ok;

struct _stack {
	struct _stack *next;
	gint fatal;
	gchar *what;
};

/* per-thread state */
struct _state {
	gchar *test;
	gint nonfatal;
	struct _stack *state;
};

static GHashTable *info_table;

gint camel_test_verbose;

static void
dump_action (GThread *thread,
             struct _state *s,
             gpointer d)
{
	struct _stack *node;

	printf ("\nThread %p:\n", thread);

	node = s->state;
	if (node) {
		printf ("Current action:\n");
		while (node) {
			printf ("\t%s%s\n", node->fatal?"":"[nonfatal]", node->what);
			node = node->next;
		}
	}
	printf ("\tTest: %s\n", s->test);
}

static void G_GNUC_NORETURN
die (gint sig)
{
	static gint indie = 0;

	if (!indie) {
		indie = 1;
		printf ("\n\nReceived fatal signal %d\n", sig);
		g_hash_table_foreach (info_table, (GHFunc) dump_action, 0);

		if (camel_test_verbose > 2) {
			printf ("Attach debugger to pid %d to debug\n", getpid ());
			sleep (1000);
		}
	}

	_exit (1);
}

static struct _state *
current_state (void)
{
	struct _state *info;

	if (info_table == NULL)
		info_table = g_hash_table_new (0, 0);

	info = g_hash_table_lookup (info_table, CAMEL_TEST_ID);
	if (info == NULL) {
		info = g_malloc0 (sizeof (*info));
		g_hash_table_insert (info_table, CAMEL_TEST_ID, info);
	}
	return info;
}

void
camel_test_init (gint argc,
                 gchar **argv)
{
	struct stat st;
	gchar *path;
	gint i;

	setup = 1;

	path = g_strdup_printf ("/tmp/camel-test");
	if (mkdir (path, 0700) == -1 && errno != EEXIST)
		abort ();

	if (g_stat (path, &st) == -1)
		abort ();

	if (!S_ISDIR (st.st_mode) || access (path, R_OK | W_OK | X_OK) == -1)
		abort ();

	camel_init (path, FALSE);
	g_free (path);

	info_table = g_hash_table_new (0, 0);

	signal (SIGSEGV, die);
	signal (SIGABRT, die);

	/* default, just say what, how well we did, unless fail, then abort */
	camel_test_verbose = 1;

	for (i = 0; i < argc; i++) {
		if (argv[i][0] == '-') {
			switch (argv[i][1]) {
			case 'v':
				camel_test_verbose = strlen (argv[i]);
				break;
			case 'q':
				camel_test_verbose = 0;
				break;
			}
		}
	}
}

void camel_test_start (const gchar *what)
{
	struct _state *s;

	CAMEL_TEST_LOCK;

	s = current_state ();

	if (!setup)
		camel_test_init (0, 0);

	ok = 1;

	s->test = g_strdup (what);

	if (camel_test_verbose > 0) {
		printf ("Test: %s ... ", what);
		fflush (stdout);
	}

	CAMEL_TEST_UNLOCK;
}

void camel_test_push (const gchar *what, ...)
{
	struct _stack *node;
	va_list ap;
	gchar *text;
	struct _state *s;

	CAMEL_TEST_LOCK;

	s = current_state ();

	va_start (ap, what);
	text = g_strdup_vprintf (what, ap);
	va_end (ap);

	if (camel_test_verbose > 3)
		printf ("Start step: %s\n", text);

	node = g_malloc (sizeof (*node));
	node->what = text;
	node->next = s->state;
	node->fatal = 1;
	s->state = node;

	CAMEL_TEST_UNLOCK;
}

void camel_test_pull (void)
{
	struct _stack *node;
	struct _state *s;

	CAMEL_TEST_LOCK;

	s = current_state ();

	g_return_if_fail (s->state);

	if (camel_test_verbose > 3)
		printf ("Finish step: %s\n", s->state->what);

	node = s->state;
	s->state = node->next;
	if (!node->fatal)
		s->nonfatal--;
	g_free (node->what);
	g_free (node);

	CAMEL_TEST_UNLOCK;
}

/* where to set breakpoints */
void camel_test_break (void);

void camel_test_break (void)
{
}

void camel_test_fail (const gchar *why, ...)
{
	va_list ap;

	va_start (ap, why);
	camel_test_failv (why, ap);
	va_end (ap);
}

void camel_test_failv (const gchar *why, va_list ap)
{
	gchar *text;
	struct _state *s;

	CAMEL_TEST_LOCK;

	s = current_state ();

	text = g_strdup_vprintf (why, ap);

	if ((s->nonfatal == 0 && camel_test_verbose > 0)
	    || (s->nonfatal && camel_test_verbose > 1)) {
		printf ("Failed.\n%s\n", text);
		camel_test_break ();
	}

	g_free (text);

	if ((s->nonfatal == 0 && camel_test_verbose > 0)
	    || (s->nonfatal && camel_test_verbose > 2)) {
		g_hash_table_foreach (info_table, (GHFunc) dump_action, 0);
	}

	if (s->nonfatal == 0) {
		exit (1);
	} else {
		ok = 0;
		if (camel_test_verbose > 1) {
			printf ("Known problem (ignored):\n");
			dump_action (CAMEL_TEST_ID, s, 0);
		}
	}

	CAMEL_TEST_UNLOCK;
}

void camel_test_nonfatal (const gchar *what, ...)
{
	struct _stack *node;
	va_list ap;
	gchar *text;
	struct _state *s;

	CAMEL_TEST_LOCK;

	s = current_state ();

	va_start (ap, what);
	text = g_strdup_vprintf (what, ap);
	va_end (ap);

	if (camel_test_verbose > 3)
		printf ("Start nonfatal: %s\n", text);

	node = g_malloc (sizeof (*node));
	node->what = text;
	node->next = s->state;
	node->fatal = 0;
	s->nonfatal++;
	s->state = node;

	CAMEL_TEST_UNLOCK;
}

void camel_test_fatal (void)
{
	camel_test_pull ();
}

void camel_test_end (void)
{
	if (camel_test_verbose > 0) {
		if (ok)
			printf ("Ok\n");
		else
			printf ("Partial success\n");
	}

	fflush (stdout);
}

/* compare strings, ignore whitespace though */
gint string_equal (const gchar *a, const gchar *b)
{
	const gchar *ap, *bp;

	ap = a;
	bp = b;

	while (*ap && *bp) {
		while (*ap == ' ' || *ap == '\n' || *ap == '\t')
			ap++;
		while (*bp == ' ' || *bp == '\n' || *bp == '\t')
			bp++;

		a = ap;
		b = bp;

		while (*ap && *ap != ' ' && *ap != '\n' && *ap != '\t')
			ap++;
		while (*bp && *bp != ' ' && *bp != '\n' && *bp != '\t')
			bp++;

		if (ap - a != bp - a
		    && ap - a > 0
		    && memcmp (a, b, ap - a) != 0) {
			return 0;
		}
	}

	return 1;
}