/* Copyright 2011-2015 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

#if defined _WIN32 || defined __CYGWIN__
#ifndef WIN32
#define WIN32
#endif
#endif

#ifndef WIN32
#define WEAK __attribute__ ((weak))
#else
#define WEAK
#endif

#include <inttypes.h> /* intmax_t, uintmax_t, PRI* */
#include <stddef.h> /* size_t */

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__ ((used, section ("__DATA, .ctest")))
#else
#define __Test_Section __attribute__ ((used, section (".ctest")))
#endif

#define __CTEST_STRUCT(sname, tname, _skip, __data, __setup, __teardown) \
    static 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 WEAK sname##_setup(struct sname##_data* data)

#define CTEST_TEARDOWN(sname) \
    void 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(const char* fmt, ...);
void CTEST_ERR(const 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, size_t expsize,
                 const unsigned char* real, size_t realsize,
                 const char* caller, int line);
#define ASSERT_DATA(exp, expsize, real, realsize) \
    assert_data(exp, expsize, real, realsize, __FILE__, __LINE__)

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

void assert_equal_u(uintmax_t exp, uintmax_t real, const char* caller, int line);
#define ASSERT_EQUAL_U(exp, real) assert_equal_u(exp, real, __FILE__, __LINE__)

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

void assert_not_equal_u(uintmax_t exp, uintmax_t real, const char* caller, int line);
#define ASSERT_NOT_EQUAL_U(exp, real) assert_not_equal_u(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__)

void assert_dbl_near(double exp, double real, double tol, const char* caller, int line);
#define ASSERT_DBL_NEAR(exp, real) assert_dbl_near(exp, real, 1e-4, __FILE__, __LINE__)
#define ASSERT_DBL_NEAR_TOL(exp, real, tol) assert_dbl_near(exp, real, tol, __FILE__, __LINE__)

void assert_dbl_far(double exp, double real, double tol, const char* caller, int line);
#define ASSERT_DBL_FAR(exp, real) assert_dbl_far(exp, real, 1e-4, __FILE__, __LINE__)
#define ASSERT_DBL_FAR_TOL(exp, real, tol) assert_dbl_far(exp, real, tol, __FILE__, __LINE__)

#ifdef CTEST_MAIN

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

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

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) { }

inline static void vprint_errormsg(const char* const fmt, va_list ap) {
	// (v)snprintf returns the number that would have been written
    const int ret = vsnprintf(ctest_errormsg, ctest_errorsize, fmt, ap);
    if (ret < 0) {
		ctest_errormsg[0] = 0x00;
    } else {
    	const size_t size = (size_t) ret;
    	const size_t s = (ctest_errorsize <= size ? size -ctest_errorsize : size);
    	// ctest_errorsize may overflow at this point
		ctest_errorsize -= s;
		ctest_errormsg += s;
    }
}

inline static void print_errormsg(const char* const fmt, ...) {
    va_list argp;
    va_start(argp, fmt);
    vprint_errormsg(fmt, argp);
    va_end(argp);
}

static void msg_start(const char* color, const char* title) {
    if (color_output) {
    	print_errormsg("%s", color);
    }
    print_errormsg("  %s: ", title);
}

static void msg_end() {
    if (color_output) {
    	print_errormsg(ANSI_NORMAL);
    }
    print_errormsg("\n");
}

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

    va_start(argp, fmt);
    vprint_errormsg(fmt, argp);
    va_end(argp);

    msg_end();
}

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

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

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

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

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

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

void assert_dbl_near(double exp, double real, double tol, const char* caller, int line) {
    double diff = exp - real;
    double absdiff = diff;
    /* avoid using fabs and linking with a math lib */
    if(diff < 0) {
      absdiff *= -1;
    }
    if (absdiff > tol) {
        CTEST_ERR("%s:%d  expected %0.3e, got %0.3e (diff %0.3e, tol %0.3e)", caller, line, exp, real, diff, tol);
    }
}

void assert_dbl_far(double exp, double real, double tol, const char* caller, int line) {
    double diff = exp - real;
    double absdiff = diff;
    /* avoid using fabs and linking with a math lib */
    if(diff < 0) {
      absdiff *= -1;
    }
    if (absdiff <= tol) {
        CTEST_ERR("%s:%d  expected %0.3e, got %0.3e (diff %0.3e, tol %0.3e)", caller, line, exp, real, diff, tol);
    }
}

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) {
    (void) t; // fix unused parameter warning
    return 1;
}

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

static uint64_t getCurrentTime() {
    struct timeval now;
    gettimeofday(&now, NULL);
    uint64_t now64 = (uint64_t) now.tv_sec;
    now64 *= 1000000;
    now64 += ((uint64_t) 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;
    }
#ifdef CTEST_NO_COLORS
    color_output = 0;
#else
    color_output = isatty(1);
#endif
    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 == &__TNAME(suite, test)) continue;
        if (filter(test)) total++;
    }

    for (test = ctest_begin; test != ctest_end; test++) {
        if (test == &__TNAME(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 = (TearDownFunc) 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 CTEST_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