/*
 * CUTest -- C/C++ Unit Test facility
 * <http://github.com/mity/cutest>
 *
 * Copyright (c) 2013-2017 Martin Mitas
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef CUTEST_H__
#define CUTEST_H__


/************************
 *** Public interface ***
 ************************/

/* By default, <cutest.h> provides the main program entry point (function
 * main()). However, if the test suite is composed of multiple source files
 * which include <cutest.h>, then this causes a problem of multiple main()
 * definitions. To avoid this problem, #define macro TEST_NO_MAIN in all
 * compilation units but one.
 */

/* Macro to specify list of unit tests in the suite.
 * The unit test implementation MUST provide list of unit tests it implements
 * with this macro:
 *
 *   TEST_LIST = {
 *       { "test1_name", test1_func_ptr },
 *       { "test2_name", test2_func_ptr },
 *       ...
 *       { 0 }
 *   };
 *
 * The list specifies names of each test (must be unique) and pointer to
 * a function implementing it. The function does not take any arguments
 * and has no return values, i.e. every test function has tp be compatible
 * with this prototype:
 *
 *   void test_func(void);
 */
#define TEST_LIST              const struct test__ test_list__[]


/* Macros for testing whether an unit test succeeds or fails. These macros
 * can be used arbitrarily in functions implementing the unit tests.
 *
 * If any condition fails throughout execution of a test, the test fails.
 *
 * TEST_CHECK takes only one argument (the condition), TEST_CHECK_ allows
 * also to specify an error message to print out if the condition fails.
 * (It expects printf-like format string and its parameters). The macros
 * return non-zero (condition passes) or 0 (condition fails).
 *
 * That can be useful when more conditions should be checked only if some
 * preceding condition passes, as illustrated in this code snippet:
 *
 *   SomeStruct* ptr = allocate_some_struct();
 *   if(TEST_CHECK(ptr != NULL)) {
 *       TEST_CHECK(ptr->member1 < 100);
 *       TEST_CHECK(ptr->member2 > 200);
 *   }
 */
#define TEST_CHECK_(cond,...)  test_check__((cond), __FILE__, __LINE__, __VA_ARGS__)
#define TEST_CHECK(cond)       test_check__((cond), __FILE__, __LINE__, "%s", #cond)


/**********************
 *** Implementation ***
 **********************/

/* The unit test files should not rely on anything below. */

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

#if defined(unix) || defined(__unix__) || defined(__unix) || defined(__APPLE__)
    #define CUTEST_UNIX__    1
    #include <errno.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <sys/wait.h>
    #include <signal.h>
#endif

#if defined(_WIN32) || defined(__WIN32__) || defined(__WINDOWS__)
    #define CUTEST_WIN__     1
    #include <windows.h>
    #include <io.h>
#endif

#ifdef __cplusplus
    #include <exception>
#endif


/* Note our global private identifiers end with '__' to mitigate risk of clash
 * with the unit tests implementation. */


#ifdef __cplusplus
    extern "C" {
#endif


struct test__ {
    const char* name;
    void (*func)(void);
};

extern const struct test__ test_list__[];

int test_check__(int cond, const char* file, int line, const char* fmt, ...);


#ifndef TEST_NO_MAIN

static char* test_argv0__ = NULL;
static int test_count__ = 0;
static int test_no_exec__ = 0;
static int test_no_summary__ = 0;
static int test_skip_mode__ = 0;

static int test_stat_failed_units__ = 0;
static int test_stat_run_units__ = 0;

static const struct test__* test_current_unit__ = NULL;
static int test_current_already_logged__ = 0;
static int test_verbose_level__ = 2;
static int test_current_failures__ = 0;
static int test_colorize__ = 0;

#define CUTEST_COLOR_DEFAULT__               0
#define CUTEST_COLOR_GREEN__                 1
#define CUTEST_COLOR_RED__                   2
#define CUTEST_COLOR_DEFAULT_INTENSIVE__     3
#define CUTEST_COLOR_GREEN_INTENSIVE__       4
#define CUTEST_COLOR_RED_INTENSIVE__         5

static size_t
test_print_in_color__(int color, const char* fmt, ...)
{
    va_list args;
    char buffer[256];
    size_t n;

    va_start(args, fmt);
    vsnprintf(buffer, sizeof(buffer), fmt, args);
    va_end(args);
    buffer[sizeof(buffer)-1] = '\0';

    if(!test_colorize__) {
        return printf("%s", buffer);
    }

#if defined CUTEST_UNIX__
    {
        const char* col_str;
        switch(color) {
            case CUTEST_COLOR_GREEN__:             col_str = "\033[0;32m"; break;
            case CUTEST_COLOR_RED__:               col_str = "\033[0;31m"; break;
            case CUTEST_COLOR_GREEN_INTENSIVE__:   col_str = "\033[1;32m"; break;
            case CUTEST_COLOR_RED_INTENSIVE__:     col_str = "\033[1;30m"; break;
            case CUTEST_COLOR_DEFAULT_INTENSIVE__: col_str = "\033[1m"; break;
            default:                               col_str = "\033[0m"; break;
        }
        printf("%s", col_str);
        n = printf("%s", buffer);
        printf("\033[0m");
        return n;
    }
#elif defined CUTEST_WIN__
    {
        HANDLE h;
        CONSOLE_SCREEN_BUFFER_INFO info;
        WORD attr;

        h = GetStdHandle(STD_OUTPUT_HANDLE);
        GetConsoleScreenBufferInfo(h, &info);

        switch(color) {
            case CUTEST_COLOR_GREEN__:             attr = FOREGROUND_GREEN; break;
            case CUTEST_COLOR_RED__:               attr = FOREGROUND_RED; break;
            case CUTEST_COLOR_GREEN_INTENSIVE__:   attr = FOREGROUND_GREEN | FOREGROUND_INTENSITY; break;
            case CUTEST_COLOR_RED_INTENSIVE__:     attr = FOREGROUND_RED | FOREGROUND_INTENSITY; break;
            case CUTEST_COLOR_DEFAULT_INTENSIVE__: attr = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_INTENSITY; break;
            default:                               attr = 0; break;
        }
        if(attr != 0)
            SetConsoleTextAttribute(h, attr);
        n = printf("%s", buffer);
        SetConsoleTextAttribute(h, info.wAttributes);
        return n;
    }
#else
    n = printf("%s", buffer);
    return n;
#endif
}

int
test_check__(int cond, const char* file, int line, const char* fmt, ...)
{
    const char *result_str;
    int result_color;
    int verbose_level;

    if(cond) {
        result_str = "ok";
        result_color = CUTEST_COLOR_GREEN__;
        verbose_level = 3;
    } else {
        if(!test_current_already_logged__  &&  test_current_unit__ != NULL) {
            printf("[ ");
            test_print_in_color__(CUTEST_COLOR_RED_INTENSIVE__, "FAILED");
            printf(" ]\n");
        }
        result_str = "failed";
        result_color = CUTEST_COLOR_RED__;
        verbose_level = 2;
        test_current_failures__++;
        test_current_already_logged__++;
    }

    if(test_verbose_level__ >= verbose_level) {
        size_t n = 0;
        va_list args;

        printf("  ");

        if(file != NULL)
            n += printf("%s:%d: Check ", file, line);

        va_start(args, fmt);
        n += vprintf(fmt, args);
        va_end(args);

        printf("... ");
        test_print_in_color__(result_color, result_str);
        printf("\n");
        test_current_already_logged__++;
    }

    return (cond != 0);
}

static void
test_list_names__(void)
{
    const struct test__* test;

    printf("Unit tests:\n");
    for(test = &test_list__[0]; test->func != NULL; test++)
        printf("  %s\n", test->name);
}

static const struct test__*
test_by_name__(const char* name)
{
    const struct test__* test;

    for(test = &test_list__[0]; test->func != NULL; test++) {
        if(strcmp(test->name, name) == 0)
            return test;
    }

    return NULL;
}

/* Call directly the given test unit function. */
static int
test_do_run__(const struct test__* test)
{
    test_current_unit__ = test;
    test_current_failures__ = 0;
    test_current_already_logged__ = 0;

    if(test_verbose_level__ >= 3) {
        test_print_in_color__(CUTEST_COLOR_DEFAULT_INTENSIVE__, "Test %s:\n", test->name);
        test_current_already_logged__++;
    } else if(test_verbose_level__ >= 1) {
        size_t n;
        char spaces[32];

        n = test_print_in_color__(CUTEST_COLOR_DEFAULT_INTENSIVE__, "Test %s... ", test->name);
        memset(spaces, ' ', sizeof(spaces));
        if(n < sizeof(spaces))
            printf("%.*s", (int) (sizeof(spaces) - n), spaces);
    } else {
        test_current_already_logged__ = 1;
    }

#ifdef __cplusplus
    try {
#endif

        /* This is good to do for case the test unit e.g. crashes. */
        fflush(stdout);
        fflush(stderr);

        test->func();

#ifdef __cplusplus
    } catch(std::exception& e) {
        const char* what = e.what();
        if(what != NULL)
            test_check__(0, NULL, 0, "Threw std::exception: %s", what);
        else
            test_check__(0, NULL, 0, "Threw std::exception");
    } catch(...) {
        test_check__(0, NULL, 0, "Threw an exception");
    }
#endif

    if(test_verbose_level__ >= 3) {
        switch(test_current_failures__) {
            case 0:  test_print_in_color__(CUTEST_COLOR_GREEN_INTENSIVE__, "  All conditions have passed.\n\n"); break;
            case 1:  test_print_in_color__(CUTEST_COLOR_RED_INTENSIVE__, "  One condition has FAILED.\n\n"); break;
            default: test_print_in_color__(CUTEST_COLOR_RED_INTENSIVE__, "  %d conditions have FAILED.\n\n", test_current_failures__); break;
        }
    } else if(test_verbose_level__ >= 1 && test_current_failures__ == 0) {
        printf("[   ");
        test_print_in_color__(CUTEST_COLOR_GREEN_INTENSIVE__, "OK");
        printf("   ]\n");
    }

    test_current_unit__ = NULL;
    return (test_current_failures__ == 0) ? 0 : -1;
}

#if defined(CUTEST_UNIX__) || defined(CUTEST_WIN__)
/* Called if anything goes bad in cutest, or if the unit test ends in other
 * way then by normal returning from its function (e.g. exception or some
 * abnormal child process termination). */
static void
test_error__(const char* fmt, ...)
{
    va_list args;

    if(test_verbose_level__ == 0)
        return;

    if(test_verbose_level__ <= 2  &&  !test_current_already_logged__  &&  test_current_unit__ != NULL) {
        printf("[ ");
        test_print_in_color__(CUTEST_COLOR_RED_INTENSIVE__, "FAILED");
        printf(" ]\n");
    }

    if(test_verbose_level__ >= 2) {
        test_print_in_color__(CUTEST_COLOR_RED_INTENSIVE__, "  Error: ");
        va_start(args, fmt);
        vprintf(fmt, args);
        va_end(args);
        printf("\n");
    }
}
#endif

/* Trigger the unit test. If possible (and not suppressed) it starts a child
 * process who calls test_do_run__(), otherwise it calls test_do_run__()
 * directly. */
static void
test_run__(const struct test__* test)
{
    int failed = 1;

    test_current_unit__ = test;
    test_current_already_logged__ = 0;

    if(!test_no_exec__) {

#if defined(CUTEST_UNIX__)

        pid_t pid;
        int exit_code;

        pid = fork();
        if(pid == (pid_t)-1) {
            test_error__("Cannot fork. %s [%d]", strerror(errno), errno);
            failed = 1;
        } else if(pid == 0) {
            /* Child: Do the test. */
            failed = (test_do_run__(test) != 0);
            exit(failed ? 1 : 0);
        } else {
            /* Parent: Wait until child terminates and analyze its exit code. */
            waitpid(pid, &exit_code, 0);
            if(WIFEXITED(exit_code)) {
                switch(WEXITSTATUS(exit_code)) {
                    case 0:   failed = 0; break;   /* test has passed. */
                    case 1:   /* noop */ break;    /* "normal" failure. */
                    default:  test_error__("Unexpected exit code [%d]", WEXITSTATUS(exit_code));
                }
            } else if(WIFSIGNALED(exit_code)) {
                char tmp[32];
                const char* signame;
                switch(WTERMSIG(exit_code)) {
                    case SIGINT:  signame = "SIGINT"; break;
                    case SIGHUP:  signame = "SIGHUP"; break;
                    case SIGQUIT: signame = "SIGQUIT"; break;
                    case SIGABRT: signame = "SIGABRT"; break;
                    case SIGKILL: signame = "SIGKILL"; break;
                    case SIGSEGV: signame = "SIGSEGV"; break;
                    case SIGILL:  signame = "SIGILL"; break;
                    case SIGTERM: signame = "SIGTERM"; break;
                    default:      sprintf(tmp, "signal %d", WTERMSIG(exit_code)); signame = tmp; break;
                }
                test_error__("Test interrupted by %s", signame);
            } else {
                test_error__("Test ended in an unexpected way [%d]", exit_code);
            }
        }

#elif defined(CUTEST_WIN__)

        char buffer[512] = {0};
        STARTUPINFOA startupInfo = {0};
        PROCESS_INFORMATION processInfo;
        DWORD exitCode;

        /* Windows has no fork(). So we propagate all info into the child
         * through a command line arguments. */
        _snprintf(buffer, sizeof(buffer)-1,
                 "%s --no-exec --no-summary --verbose=%d --color=%s -- \"%s\"",
                 test_argv0__, test_verbose_level__,
                 test_colorize__ ? "always" : "never", test->name);
        startupInfo.cb = sizeof(STARTUPINFO);
        if(CreateProcessA(NULL, buffer, NULL, NULL, FALSE, 0, NULL, NULL, &startupInfo, &processInfo)) {
            WaitForSingleObject(processInfo.hProcess, INFINITE);
            GetExitCodeProcess(processInfo.hProcess, &exitCode);
            CloseHandle(processInfo.hThread);
            CloseHandle(processInfo.hProcess);
            failed = (exitCode != 0);
        } else {
            test_error__("Cannot create unit test subprocess [%ld].", GetLastError());
            failed = 1;
        }

#else

        /* A platform where we don't know how to run child process. */
        failed = (test_do_run__(test) != 0);

#endif

    } else {
        /* Child processes suppressed through --no-exec. */
        failed = (test_do_run__(test) != 0);
    }

    test_current_unit__ = NULL;

    test_stat_run_units__++;
    if(failed)
        test_stat_failed_units__++;
}

#if defined(CUTEST_WIN__)
/* Callback for SEH events. */
static LONG CALLBACK
test_exception_filter__(EXCEPTION_POINTERS *ptrs)
{
    test_error__("Unhandled SEH exception %08lx at %p.",
                 ptrs->ExceptionRecord->ExceptionCode,
                 ptrs->ExceptionRecord->ExceptionAddress);
    fflush(stdout);
    fflush(stderr);
    return EXCEPTION_EXECUTE_HANDLER;
}
#endif

static void
test_help__(void)
{
    printf("Usage: %s [options] [test...]\n", test_argv0__);
    printf("Run the specified unit tests; or if the option '--skip' is used, run all\n");
    printf("tests in the suite but those listed.  By default, if no tests are specified\n");
    printf("on the command line, all unit tests in the suite are run.\n");
    printf("\n");
    printf("Options:\n");
    printf("  -s, --skip            Execute all unit tests but the listed ones\n");
    printf("      --no-exec         Do not execute unit tests as child processes\n");
    printf("      --no-summary      Suppress printing of test results summary\n");
    printf("  -l, --list            List unit tests in the suite and exit\n");
    printf("  -v, --verbose         Enable more verbose output\n");
    printf("      --verbose=LEVEL   Set verbose level to LEVEL:\n");
    printf("                          0 ... Be silent\n");
    printf("                          1 ... Output one line per test (and summary)\n");
    printf("                          2 ... As 1 and failed conditions (this is default)\n");
    printf("                          3 ... As 1 and all conditions (and extended summary)\n");
    printf("      --color=WHEN      Enable colorized output (WHEN is one of 'auto', 'always', 'never')\n");
    printf("  -h, --help            Display this help and exit\n");
    printf("\n");
    test_list_names__();
}

int
main(int argc, char** argv)
{
    const struct test__** tests = NULL;
    int i, j, n = 0;
    int seen_double_dash = 0;

    test_argv0__ = argv[0];

#if defined CUTEST_UNIX__
    test_colorize__ = isatty(STDOUT_FILENO);
#elif defined CUTEST_WIN__
    test_colorize__ = _isatty(_fileno(stdout));
#else
    test_colorize__ = 0;
#endif

    /* Parse options */
    for(i = 1; i < argc; i++) {
        if(seen_double_dash || argv[i][0] != '-') {
            tests = (const struct test__**) realloc((void*)tests, (n+1) * sizeof(const struct test__*));
            if(tests == NULL) {
                fprintf(stderr, "Out of memory.\n");
                exit(2);
            }
            tests[n] = test_by_name__(argv[i]);
            if(tests[n] == NULL) {
                fprintf(stderr, "%s: Unrecognized unit test '%s'\n", argv[0], argv[i]);
                fprintf(stderr, "Try '%s --list' for list of unit tests.\n", argv[0]);
                exit(2);
            }
            n++;
        } else if(strcmp(argv[i], "--") == 0) {
            seen_double_dash = 1;
        } else if(strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
            test_help__();
            exit(0);
        } else if(strcmp(argv[i], "--verbose") == 0 || strcmp(argv[i], "-v") == 0) {
            test_verbose_level__++;
        } else if(strncmp(argv[i], "--verbose=", 10) == 0) {
            test_verbose_level__ = atoi(argv[i] + 10);
        } else if(strcmp(argv[i], "--color=auto") == 0) {
            /* noop (set from above) */
        } else if(strcmp(argv[i], "--color=always") == 0 || strcmp(argv[i], "--color") == 0) {
            test_colorize__ = 1;
        } else if(strcmp(argv[i], "--color=never") == 0) {
            test_colorize__ = 0;
        } else if(strcmp(argv[i], "--skip") == 0 || strcmp(argv[i], "-s") == 0) {
            test_skip_mode__ = 1;
        } else if(strcmp(argv[i], "--no-exec") == 0) {
            test_no_exec__ = 1;
        } else if(strcmp(argv[i], "--no-summary") == 0) {
            test_no_summary__ = 1;
        } else if(strcmp(argv[i], "--list") == 0 || strcmp(argv[i], "-l") == 0) {
            test_list_names__();
            exit(0);
        } else {
            fprintf(stderr, "%s: Unrecognized option '%s'\n", argv[0], argv[i]);
            fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
            exit(2);
        }
    }

#if defined(CUTEST_WIN__)
    SetUnhandledExceptionFilter(test_exception_filter__);
#endif

    /* Count all test units */
    test_count__ = 0;
    for(i = 0; test_list__[i].func != NULL; i++)
        test_count__++;

    /* Run the tests */
    if(n == 0) {
        /* Run all tests */
        for(i = 0; test_list__[i].func != NULL; i++)
            test_run__(&test_list__[i]);
    } else if(!test_skip_mode__) {
        /* Run the listed tests */
        for(i = 0; i < n; i++)
            test_run__(tests[i]);
    } else {
        /* Run all tests except those listed */
        for(i = 0; test_list__[i].func != NULL; i++) {
            int want_skip = 0;
            for(j = 0; j < n; j++) {
                if(tests[j] == &test_list__[i]) {
                    want_skip = 1;
                    break;
                }
            }
            if(!want_skip)
                test_run__(&test_list__[i]);
        }
    }

    /* Write a summary */
    if(!test_no_summary__ && test_verbose_level__ >= 1) {
        test_print_in_color__(CUTEST_COLOR_DEFAULT_INTENSIVE__, "\nSummary:\n");

        if(test_verbose_level__ >= 3) {
            printf("  Count of all unit tests:     %4d\n", test_count__);
            printf("  Count of run unit tests:     %4d\n", test_stat_run_units__);
            printf("  Count of failed unit tests:  %4d\n", test_stat_failed_units__);
            printf("  Count of skipped unit tests: %4d\n", test_count__ - test_stat_run_units__);
        }

        if(test_stat_failed_units__ == 0) {
            test_print_in_color__(CUTEST_COLOR_GREEN_INTENSIVE__,
                    "  SUCCESS: All unit tests have passed.\n");
        } else {
            test_print_in_color__(CUTEST_COLOR_RED_INTENSIVE__,
                    "  FAILED: %d of %d unit tests have failed.\n",
                    test_stat_failed_units__, test_stat_run_units__);
        }
    }

    if(tests != NULL)
        free((void*)tests);

    return (test_stat_failed_units__ == 0) ? 0 : 1;
}


#endif  /* #ifndef TEST_NO_MAIN */

#ifdef __cplusplus
    }  /* extern "C" */
#endif


#endif  /* #ifndef CUTEST_H__ */
