/*
 * Copyright (c) 2021, the SerenityOS developers.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <AK/Random.h>
#include <LibCore/ArgsParser.h>
#include <fcntl.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <unistd.h>

int main(int argc, char** argv)
{
    const char* target = nullptr;
    int max_file_size = 1024 * 1024;
    int count = 1024;

    Core::ArgsParser args_parser;
    args_parser.add_option(max_file_size, "Maximum file size to generate", "max-size", 's', "size");
    args_parser.add_option(count, "Number of truncations to run", "number", 'n', "number");
    args_parser.add_positional_argument(target, "Target file path", "target");
    args_parser.parse(argc, argv);

    int fd = creat(target, 0666);
    if (fd < 0) {
        perror("Couldn't create target file");
        return EXIT_FAILURE;
    }
    close(fd);

    for (int i = 0; i < count; i++) {
        auto new_file_size = AK::get_random<uint64_t>() % (max_file_size + 1);
        printf("(%d/%d)\tTruncating to %" PRIu64 " bytes...\n", i + 1, count, new_file_size);
        if (truncate(target, new_file_size) < 0) {
            perror("Couldn't truncate target file");
            return EXIT_FAILURE;
        }
    }

    if (unlink(target) < 0) {
        perror("Couldn't remove target file");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}