/*
 * versmr.h
 * 
 * Copyright 2026 
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 * 
 */

#if (!defined(__LIB_versmr_H_))
#define __LIB_versmr_H_

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

#define true 1
#define false 0
typedef unsigned char bool_t;

#define VERSMR_VERSION "1.0"

static void __help(void) {
    puts(
        "Console VERSMR V" VERSMR_VERSION                           "\n"
        "    " "Simple version control"                             "\n"
        "Using:"                                                    "\n"
        "    " "versmr [-v/--version] - view versmr version"        "\n"
        "    " "versmr [-h/--help] - show this help"                "\n"
        "    " "versmr [-s/--set] [version] - init version"         "\n"
        "To update version, call (one of the options):"             "\n"
        "    " "bash .versmr.bash"                                  "\n"
        "    " "make -f versup.mk"                                  "\n"
        "    " "chmod +x .versmr.bash && ./.versmr.bash"            "\n"
        "To set version:"                                           "\n"
        "    " "versmr --set VERSION"                               "\0"
    ); 
}

static void versmr_error(char* _err) {
    printf("\033[1mversmr: \033[91m%s\033[0m\n", _err);
}

static int __versmr_begin(char* version) {
    FILE* bs = fopen(".versmr.bash", "w");
    if (bs == NULL) {
        versmr_error("Unable to find configuration file!");
        return EXIT_FAILURE;
    }
    fputs("#!/bin/bash\nvers=$(cat .versmr)\nvers=$(($vers+1))\necho $vers > .versmr", bs);
    fclose(bs);
    FILE* mk = fopen("versup.mk", "w");
    if (mk == NULL) {
        versmr_error("Unable to find configuration file!");
        return EXIT_FAILURE;
    }
    fputs("all:\n\tbash .versmr.bash\n", mk);
    fclose(mk);
    FILE* fp = fopen(".versmr", "w");
    if (fp == NULL) {
        versmr_error("Unable to find configuration file!");
        return EXIT_FAILURE;
    }
    unsigned long vers = 0;
    if (sscanf(version, "%lu", &vers) == 0) {
        versmr_error("Incorrect version format!");
        fclose(fp);
        return EXIT_FAILURE;
    }; 
    fprintf(fp, "%lu", vers);
    fclose(fp);
    return EXIT_SUCCESS;
}

static int __get_version(void) {
    FILE* fp = fopen(".versmr", "r");
    if (fp == NULL) {
        versmr_error("Unable to find configuration file!");
        return EXIT_FAILURE;
    }
    unsigned long vers = 0;
    if (fscanf(fp, "%lu", &vers) == 0) {
        fclose(fp);
        versmr_error("Unable to find configuration file!");
        return EXIT_FAILURE;
    };
    fprintf(fp, "%lu", vers);
    fclose(fp);
    return EXIT_SUCCESS;
}

int _lib_versmr_main(int argc, char** argv) {

    unsigned int pos = 1;
    bool_t get_name = false;
    char* set_version = NULL;
    while (pos != argc) {
        char* str = argv[pos];
        if (str[0] == '-') {
            bool_t cn_size = false;
            if (str[1] == '-') cn_size = true;
            switch (str[1 + cn_size]) {
                case 'e':
                return __get_version();
                case 'h':
                __help();
                return EXIT_SUCCESS;
                case 'v':
                puts(VERSMR_VERSION);
                return EXIT_SUCCESS;
                case 's':
                get_name = true;
                break;
                default:
                versmr_error("Unknown argument!");
                return EXIT_FAILURE;
            }
        } else {
            if (get_name) set_version = str;
            else set_version = str;
            get_name = false;
        }
        pos ++;
    }
    if (get_name == true) {
        versmr_error("Cannot find option in \"--set\" argument!");
        return EXIT_FAILURE;
    }
    if (set_version == NULL) set_version = "1";
    return __versmr_begin(set_version);
}

#endif /* __LIB_versmr_H_ */