/* See COPYING.txt for the full license governing this code. */

/**

 * \file variator_exhaustive.c

 *

 * Source file for the variator that tests the SUT with all the different

 * variations of input parameters that are valid.

 */

#include <time.h>

#include <SDL_test.h>

#include "SDL_visualtest_sut_configparser.h"

#include "SDL_visualtest_exhaustive_variator.h"

static int

NextVariation(SDLVisualTest_Variation* variation,

              SDLVisualTest_SUTConfig* config)

{

    int i, carry;

    if(!variation)

    {

        SDLTest_LogError("variation argument cannot be NULL");

        return -1;

    }

    if(!config)

    {

        SDLTest_LogError("config argument cannot be NULL");

        return -1;

    }

    carry = 1;

    for(i = 0; i < variation->num_vars; i++)

    {

        carry = SDLVisualTest_NextValue(&variation->vars[i], &config->options[i]);

        if(carry != 1)

            break;

    }

    if(carry == 1) /* we're done, we've tried all possible variations */

        return 0;

    if(carry == 0)

        return 1;

    SDLTest_LogError("NextVariation() failed");

    return -1;

}

int

SDLVisualTest_InitExhaustiveVariator(SDLVisualTest_ExhaustiveVariator* variator,

                                     SDLVisualTest_SUTConfig* config)

{

    if(!variator)

    {

        SDLTest_LogError("variator argument cannot be NULL");

        return 0;

    }

    if(!config)

    {

        SDLTest_LogError("config argument cannot be NULL");

        return 0;

    }

    SDLTest_FuzzerInit(time(NULL));

    variator->config = *config;

    variator->variation.num_vars = 0;

    variator->variation.vars = NULL;

    return 1;

}

/* TODO: Right now variations where an option is not specified at all are not

   tested for. This can be implemented by switching the on attribute for integer,

   enum and string options to true and false. */

char*

SDLVisualTest_GetNextExhaustiveVariation(SDLVisualTest_ExhaustiveVariator* variator)

{

    int success;

    if(!variator)

    {

        SDLTest_LogError("variator argument cannot be NULL");

        return NULL;

    }

    if(!variator->variation.vars) /* the first time this function is called */

    {

        success = SDLVisualTest_InitVariation(&variator->variation,

                                              &variator->config);

        if(!success)

        {

            SDLTest_LogError("SDLVisualTest_InitVariation() failed");

            return NULL;

        }

        success = SDLVisualTest_MakeStrFromVariation(&variator->variation,

                  &variator->config, variator->buffer, MAX_SUT_ARGS_LEN);

        if(!success)

        {

            SDLTest_LogError("SDLVisualTest_MakeStrFromVariation() failed");

            return NULL;

        }

        return variator->buffer;

    }

    else

    {

        success = NextVariation(&variator->variation, &variator->config);

        if(success == 1)

        {

            success = SDLVisualTest_MakeStrFromVariation(&variator->variation,

                      &variator->config, variator->buffer, MAX_SUT_ARGS_LEN);

            if(!success)

            {

                SDLTest_LogError("SDLVisualTest_MakeStrFromVariation() failed");

                return NULL;

            }

            return variator->buffer;

        }

        else if(success == -1)

            SDLTest_LogError("NextVariation() failed.");

        return NULL;

    }

    return NULL;

}

void

SDLVisualTest_FreeExhaustiveVariator(SDLVisualTest_ExhaustiveVariator* variator)

{

    if(!variator)

    {

        SDLTest_LogError("variator argument cannot be NULL");

        return;

    }

    SDL_free(variator->variation.vars);

    variator->variation.vars = NULL;

}