/* Copyright 2011,2012 Bas van den Berg
 *
 * 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.
 */

#ifndef CTEST_H
#define CTEST_H

#ifdef _MSC_VER
#define snprintf _snprintf
#pragma section(".ctest")

#include <io.h>
#define isatty _isatty
#endif

#ifndef UNUSED_PARAM
/**
 * \def UNUSED_PARAM(p);
 *
 * A macro for quelling compiler warnings about unused variables.
 */
#define UNUSED_PARAM(p) ((void)&(p))
#endif /* UNUSED_PARM */

typedef void (*SetupFunc)(void*);
typedef void (*TearDownFunc)(void*);

struct ctest {
	const char* ssname;	 // suite name
	const char* ttname;	 // test name
	void (*run)();
	int skip;

	void* data;
	SetupFunc setup;
	TearDownFunc teardown;

	unsigned int magic;
};

#define __FNAME(sname, tname) __ctest_##sname##_##tname##_run
#define __TNAME(sname, tname) __ctest_##sname##_##tname

#define __CTEST_MAGIC (0xdeadbeef)
#ifdef __APPLE__
#define __Test_Section __attribute__((unused, section("__DATA, .ctest")))
#define MS__Test_Section
#else
#ifdef _MSC_VER
#define __Test_Section
#define MS__Test_Section __declspec(allocate(".ctest"))
#else
#define __Test_Section __attribute__((unused, section(".ctest")))
#define MS__Test_Section
#endif
#endif

#define __CTEST_STRUCT(sname, tname, _skip, __data, __setup, __teardown)                    \
	MS__Test_Section struct ctest __TNAME(sname, tname) __Test_Section = {.ssname = #sname, \
		.ttname = #tname,                                                                   \
		.run = __FNAME(sname, tname),                                                       \
		.skip = _skip,                                                                      \
		.data = __data,                                                                     \
		.setup = (SetupFunc)__setup,                                                        \
		.teardown = (TearDownFunc)__teardown,                                               \
		.magic = __CTEST_MAGIC};

#define CTEST_DATA(sname) struct sname##_data

#define CTEST_SETUP(sname) void __attribute__((weak)) sname##_setup(struct sname##_data* data)

#define CTEST_TEARDOWN(sname) void __attribute__((weak)) sname##_teardown(struct sname##_data* data)

#define __CTEST_INTERNAL(sname, tname, _skip)             \
	void __FNAME(sname, tname)();                         \
	__CTEST_STRUCT(sname, tname, _skip, NULL, NULL, NULL) \
	void __FNAME(sname, tname)()

#ifdef __APPLE__
#define SETUP_FNAME(sname) NULL
#define TEARDOWN_FNAME(sname) NULL
#else
#define SETUP_FNAME(sname) sname##_setup
#define TEARDOWN_FNAME(sname) sname##_teardown
#endif

#define __CTEST2_INTERNAL(sname, tname, _skip)                                                              \
	static struct sname##_data __ctest_##sname##_data;                                                      \
	CTEST_SETUP(sname);                                                                                     \
	CTEST_TEARDOWN(sname);                                                                                  \
	void __FNAME(sname, tname)(struct sname##_data * data);                                                 \
	__CTEST_STRUCT(sname, tname, _skip, &__ctest_##sname##_data, SETUP_FNAME(sname), TEARDOWN_FNAME(sname)) \
	void __FNAME(sname, tname)(struct sname##_data * data)

void CTEST_LOG(char* fmt, ...);
void CTEST_ERR(char* fmt, ...);	 // doesn't return

#define CTEST(sname, tname) __CTEST_INTERNAL(sname, tname, 0)
#define CTEST_SKIP(sname, tname) __CTEST_INTERNAL(sname, tname, 1)

#define CTEST2(sname, tname) __CTEST2_INTERNAL(sname, tname, 0)
#define CTEST2_SKIP(sname, tname) __CTEST2_INTERNAL(sname, tname, 1)

void assert_str(const char* exp, const char* real, const char* caller, int line);
#define ASSERT_STR(exp, real) assert_str(exp, real, __FILE__, __LINE__)

void assert_data(const unsigned char* exp,
	int expsize,
	const unsigned char* real,
	int realsize,
	const char* caller,
	int line);
#define ASSERT_DATA(exp, expsize, real, realsize) assert_data(exp, expsize, real, realsize, __FILE__, __LINE__)

void assert_equal(long exp, long real, const char* caller, int line);
#define ASSERT_EQUAL(exp, real) assert_equal(exp, real, __FILE__, __LINE__)

void assert_not_equal(long exp, long real, const char* caller, int line);
#define ASSERT_NOT_EQUAL(exp, real) assert_not_equal(exp, real, __FILE__, __LINE__)

void assert_null(void* real, const char* caller, int line);
#define ASSERT_NULL(real) assert_null((void*)real, __FILE__, __LINE__)

void assert_not_null(const void* real, const char* caller, int line);
#define ASSERT_NOT_NULL(real) assert_not_null(real, __FILE__, __LINE__)

void assert_true(int real, const char* caller, int line);
#define ASSERT_TRUE(real) assert_true(real, __FILE__, __LINE__)

void assert_false(int real, const char* caller, int line);
#define ASSERT_FALSE(real) assert_false(real, __FILE__, __LINE__)

void assert_fail(const char* caller, int line);
#define ASSERT_FAIL() assert_fail(__FILE__, __LINE__)

#ifdef CTEST_MAIN

#include <setjmp.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#ifndef _MSC_VER
#include <sys/time.h>
#endif
#include <inttypes.h>
#ifndef _MSC_VER
#include <unistd.h>
#endif
#include <stdint.h>
#include <stdlib.h>

#ifdef __APPLE__
#include <dlfcn.h>
#endif

//#define COLOR_OK

static size_t ctest_errorsize;
static char* ctest_errormsg;
#define MSG_SIZE 4096
static char ctest_errorbuffer[MSG_SIZE];
static jmp_buf ctest_err;
static int color_output = 1;
static const char* suite_name;

typedef int (*filter_func)(struct ctest*);

#define ANSI_BLACK "\033[0;30m"
#define ANSI_RED "\033[0;31m"
#define ANSI_GREEN "\033[0;32m"
#define ANSI_YELLOW "\033[0;33m"
#define ANSI_BLUE "\033[0;34m"
#define ANSI_MAGENTA "\033[0;35m"
#define ANSI_CYAN "\033[0;36m"
#define ANSI_GREY "\033[0;37m"
#define ANSI_DARKGREY "\033[01;30m"
#define ANSI_BRED "\033[01;31m"
#define ANSI_BGREEN "\033[01;32m"
#define ANSI_BYELLOW "\033[01;33m"
#define ANSI_BBLUE "\033[01;34m"
#define ANSI_BMAGENTA "\033[01;35m"
#define ANSI_BCYAN "\033[01;36m"
#define ANSI_WHITE "\033[01;37m"
#define ANSI_NORMAL "\033[0m"

static CTEST(suite, test) {}

static void msg_start(const char* color, const char* title)
{
	int size;
	if (color_output) {
		size = snprintf(ctest_errormsg, ctest_errorsize, "%s", color);
		ctest_errorsize -= size;
		ctest_errormsg += size;
	}
	size = snprintf(ctest_errormsg, ctest_errorsize, "  %s: ", title);
	ctest_errorsize -= size;
	ctest_errormsg += size;
}

static void msg_end()
{
	int size;
	if (color_output) {
		size = snprintf(ctest_errormsg, ctest_errorsize, ANSI_NORMAL);
		ctest_errorsize -= size;
		ctest_errormsg += size;
	}
	size = snprintf(ctest_errormsg, ctest_errorsize, "\n");
	ctest_errorsize -= size;
	ctest_errormsg += size;
}

void CTEST_LOG(char* fmt, ...)
{
	va_list argp;
	msg_start(ANSI_BLUE, "LOG");

	va_start(argp, fmt);
	int size = vsnprintf(ctest_errormsg, ctest_errorsize, fmt, argp);
	ctest_errorsize -= size;
	ctest_errormsg += size;
	va_end(argp);

	msg_end();
}

void CTEST_ERR(char* fmt, ...)
{
	va_list argp;
	msg_start(ANSI_YELLOW, "ERR");

	va_start(argp, fmt);
	int size = vsnprintf(ctest_errormsg, ctest_errorsize, fmt, argp);
	ctest_errorsize -= size;
	ctest_errormsg += size;
	va_end(argp);

	msg_end();
	longjmp(ctest_err, 1);
}

void assert_str(const char* exp, const char* real, const char* caller, int line)
{
	if ((exp == NULL && real != NULL) || (exp != NULL && real == NULL) || (exp && real && strcmp(exp, real) != 0)) {
		CTEST_ERR("%s:%d  expected '%s', got '%s'", caller, line, exp, real);
	}
}

void assert_data(const unsigned char* exp,
	int expsize,
	const unsigned char* real,
	int realsize,
	const char* caller,
	int line)
{
	int i;
	if (expsize != realsize) {
		CTEST_ERR("%s:%d  expected %d bytes, got %d", caller, line, expsize, realsize);
	}
	for (i = 0; i < expsize; i++) {
		if (exp[i] != real[i]) {
			CTEST_ERR("%s:%d expected 0x%02x at offset %d got 0x%02x", caller, line, exp[i], i, real[i]);
		}
	}
}

void assert_equal(long exp, long real, const char* caller, int line)
{
	if (exp != real) {
		CTEST_ERR("%s:%d  expected %ld, got %ld", caller, line, exp, real);
	}
}

void assert_not_equal(long exp, long real, const char* caller, int line)
{
	if ((exp) == (real)) {
		CTEST_ERR("%s:%d  should not be %ld", caller, line, real);
	}
}

void assert_null(void* real, const char* caller, int line)
{
	if ((real) != NULL) {
		CTEST_ERR("%s:%d  should be NULL", caller, line);
	}
}

void assert_not_null(const void* real, const char* caller, int line)
{
	if (real == NULL) {
		CTEST_ERR("%s:%d  should not be NULL", caller, line);
	}
}

void assert_true(int real, const char* caller, int line)
{
	if ((real) == 0) {
		CTEST_ERR("%s:%d  should be true", caller, line);
	}
}

void assert_false(int real, const char* caller, int line)
{
	if ((real) != 0) {
		CTEST_ERR("%s:%d  should be false", caller, line);
	}
}

void assert_fail(const char* caller, int line)
{
	CTEST_ERR("%s:%d  shouldn't come here", caller, line);
}

static int suite_all(struct ctest* t)
{
	UNUSED_PARAM(t);
	return 1;
}

static int suite_filter(struct ctest* t)
{
	return strncmp(suite_name, t->ssname, strlen(suite_name)) == 0;
}

#ifdef _MSC_VER
int gettimeofday(struct timeval* tp, struct timezone* tzp)
{
	// Note: some broken versions only have 8 trailing zero's, the correct epoch has 9 trailing zero's
	static const uint64_t EPOCH = ((uint64_t)116444736000000000ULL);

	SYSTEMTIME system_time;
	FILETIME file_time;
	uint64_t time;

	GetSystemTime(&system_time);
	SystemTimeToFileTime(&system_time, &file_time);
	time = ((uint64_t)file_time.dwLowDateTime);
	time += ((uint64_t)file_time.dwHighDateTime) << 32;

	tp->tv_sec = (long)((time - EPOCH) / 10000000L);
	tp->tv_usec = (long)(system_time.wMilliseconds * 1000);
	return 0;
}
#endif

static uint64_t getCurrentTime()
{
	struct timeval now;
	gettimeofday(&now, NULL);
	uint64_t now64 = now.tv_sec;
	now64 *= 1000000;
	now64 += (now.tv_usec);
	return now64;
}

static void color_print(const char* color, const char* text)
{
	if (color_output)
		printf("%s%s" ANSI_NORMAL "\n", color, text);
	else
		printf("%s\n", text);
}

#ifdef __APPLE__
static void* find_symbol(struct ctest* test, const char* fname)
{
	size_t len = strlen(test->ssname) + 1 + strlen(fname);
	char* symbol_name = (char*)malloc(len + 1);
	memset(symbol_name, 0, len + 1);
	snprintf(symbol_name, len + 1, "%s_%s", test->ssname, fname);

	// fprintf(stderr, ">>>> dlsym: loading %s\n", symbol_name);
	void* symbol = dlsym(RTLD_DEFAULT, symbol_name);
	if (!symbol) {
		// fprintf(stderr, ">>>> ERROR: %s\n", dlerror());
	}
	// returns NULL on error

	free(symbol_name);
	return symbol;
}
#endif

#ifdef CTEST_SEGFAULT
#include <signal.h>
static void sighandler(int signum)
{
	char msg[128];
	sprintf(msg, "[SIGNAL %d: %s]", signum, sys_siglist[signum]);
	color_print(ANSI_BRED, msg);
	fflush(stdout);

	/* "Unregister" the signal handler and send the signal back to the process
	 * so it can terminate as expected */
	signal(signum, SIG_DFL);
	kill(getpid(), signum);
}
#endif

int ctest_main(int argc, const char* argv[])
{
	static int total = 0;
	static int num_ok = 0;
	static int num_fail = 0;
	static int num_skip = 0;
	static int index = 1;
	static filter_func filter = suite_all;

#ifdef CTEST_SEGFAULT
	signal(SIGSEGV, sighandler);
#endif

	if (argc == 2) {
		suite_name = argv[1];
		filter = suite_filter;
	}

	color_output = isatty(1);

	uint64_t t1 = getCurrentTime();

	struct ctest* ctest_begin = &__TNAME(suite, test);
	struct ctest* ctest_end = &__TNAME(suite, test);
	// find begin and end of section by comparing magics
	while (1) {
		struct ctest* t = ctest_begin - 1;
		if (t->magic != __CTEST_MAGIC)
			break;
		ctest_begin--;
	}
	while (1) {
		struct ctest* t = ctest_end + 1;
		if (t->magic != __CTEST_MAGIC)
			break;
		ctest_end++;
	}
	ctest_end++;  // end after last one

	static struct ctest* test;
	for (test = ctest_begin; test != ctest_end; test++) {
		if (test == &__ctest_suite_test)
			continue;
		if (filter(test))
			total++;
	}

	for (test = ctest_begin; test != ctest_end; test++) {
		if (test == &__ctest_suite_test)
			continue;
		if (filter(test)) {
			ctest_errorbuffer[0] = 0;
			ctest_errorsize = MSG_SIZE - 1;
			ctest_errormsg = ctest_errorbuffer;
			printf("TEST %d/%d %s:%s ", index, total, test->ssname, test->ttname);
			fflush(stdout);
			if (test->skip) {
				color_print(ANSI_BYELLOW, "[SKIPPED]");
				num_skip++;
			}
			else {
				int result = setjmp(ctest_err);
				if (result == 0) {
#ifdef __APPLE__
					if (!test->setup) {
						test->setup = (SetupFunc)find_symbol(test, "setup");
					}
					if (!test->teardown) {
						test->teardown = (SetupFunc)find_symbol(test, "teardown");
					}
#endif

					if (test->setup)
						test->setup(test->data);
					if (test->data)
						test->run(test->data);
					else
						test->run();
					if (test->teardown)
						test->teardown(test->data);
						// if we got here it's ok
#ifdef COLOR_OK
					color_print(ANSI_BGREEN, "[OK]");
#else
					printf("[OK]\n");
#endif
					num_ok++;
				}
				else {
					color_print(ANSI_BRED, "[FAIL]");
					num_fail++;
				}
				if (ctest_errorsize != MSG_SIZE - 1)
					printf("%s", ctest_errorbuffer);
			}
			index++;
		}
	}
	uint64_t t2 = getCurrentTime();

	const char* color = (num_fail) ? ANSI_BRED : ANSI_GREEN;
	char results[80];
	sprintf(results, "RESULTS: %d tests (%d ok, %d failed, %d skipped) ran in %" PRIu64 " ms", total, num_ok, num_fail,
		num_skip, (t2 - t1) / 1000);
	color_print(color, results);
	return num_fail;
}

#endif

#endif