/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */

/*-************************************
 *  Dependencies
 **************************************/
#include <stdio.h>    /* fprintf, stderr */
#include "datagen.h"  /* RDG_generate */
#include "loremOut.h" /* LOREM_genOut */
#include "util.h"     /* Compiler options */

/*-************************************
 *  Constants
 **************************************/
#define KB *(1 << 10)
#define MB *(1 << 20)
#define GB *(1U << 30)

#define SIZE_DEFAULT ((64 KB) + 1)
#define SEED_DEFAULT 0
#define COMPRESSIBILITY_DEFAULT 9999

/*-************************************
 *  Macros
 **************************************/
#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...)  \
    if (displayLevel >= l) {  \
        DISPLAY(__VA_ARGS__); \
    }
static unsigned displayLevel = 2;

/*-*******************************************************
 *  Command line
 *********************************************************/
static int usage(const char* programName)
{
    DISPLAY("Compressible data generator\n");
    DISPLAY("Usage :\n");
    DISPLAY("      %s [args]\n", programName);
    DISPLAY("\n");
    DISPLAY("Arguments :\n");
    DISPLAY(" -g#    : generate # data (default:%i)\n", SIZE_DEFAULT);
    DISPLAY(" -s#    : Select seed (default:%i)\n", SEED_DEFAULT);
    DISPLAY(" -P#    : Select compressibility in %% (range [0-100])\n");
    DISPLAY(" -h     : display help and exit\n");
    return 0;
}

int main(int argc, const char** argv)
{
    unsigned probaU32             = COMPRESSIBILITY_DEFAULT;
    double litProba               = 0.0;
    U64 size                      = SIZE_DEFAULT;
    U32 seed                      = SEED_DEFAULT;
    const char* const programName = argv[0];

    int argNb;
    for (argNb = 1; argNb < argc; argNb++) {
        const char* argument = argv[argNb];

        if (!argument)
            continue; /* Protection if argument empty */

        /* Handle commands. Aggregated commands are allowed */
        if (*argument == '-') {
            argument++;
            while (*argument != 0) {
                switch (*argument) {
                    case 'h':
                        return usage(programName);
                    case 'g':
                        argument++;
                        size = 0;
                        while ((*argument >= '0') && (*argument <= '9'))
                            size *= 10, size += (U64)(*argument++ - '0');
                        if (*argument == 'K') {
                            size <<= 10;
                            argument++;
                        }
                        if (*argument == 'M') {
                            size <<= 20;
                            argument++;
                        }
                        if (*argument == 'G') {
                            size <<= 30;
                            argument++;
                        }
                        if (*argument == 'B') {
                            argument++;
                        }
                        break;
                    case 's':
                        argument++;
                        seed = 0;
                        while ((*argument >= '0') && (*argument <= '9'))
                            seed *= 10, seed += (U32)(*argument++ - '0');
                        break;
                    case 'P':
                        argument++;
                        probaU32 = 0;
                        while ((*argument >= '0') && (*argument <= '9'))
                            probaU32 *= 10,
                                    probaU32 += (U32)(*argument++ - '0');
                        if (probaU32 > 100)
                            probaU32 = 100;
                        break;
                    case 'L': /* hidden argument : Literal distribution
                                 probability */
                        argument++;
                        litProba = 0.;
                        while ((*argument >= '0') && (*argument <= '9'))
                            litProba *= 10, litProba += *argument++ - '0';
                        if (litProba > 100.)
                            litProba = 100.;
                        litProba /= 100.;
                        break;
                    case 'v':
                        displayLevel = 4;
                        argument++;
                        break;
                    default:
                        return usage(programName);
                }
            }
        }
    } /* for(argNb=1; argNb<argc; argNb++) */

    DISPLAYLEVEL(4, "Compressible data Generator \n");
    DISPLAYLEVEL(3, "Seed = %u \n", (unsigned)seed);

    if (probaU32 != COMPRESSIBILITY_DEFAULT) {
        DISPLAYLEVEL(3, "Compressibility : %i%%\n", probaU32);
        RDG_genStdout(size, (double)probaU32 / 100, litProba, seed);
    } else {
        LOREM_genOut(size, seed);
    }

    DISPLAYLEVEL(3, "\n");

    return 0;
}