#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string>
#include <string.h>
#include <windows.h>
using namespace std;

char * a_to_u(char txt[]);
char * u_to_a(char txt[]);


int main(int argc, char *argv[]) {

    if (argc != 2) {
        printf("Invalid arguments");
        return 0;
    }

    FILE *fp;
    char path[100];
    char text[5000];

    printf("Insert file path: ");
    scanf("%[^\n]s", path);

    fp = fopen(path, "r");
    if (fp) {
        fgets(text, 1024, fp);
        text[strlen(text)] = '\0';
    } else {
        printf("An error occurred while opening the file.\n");
    }
    fclose(fp);

    char *mod;
    if (strcmp(argv[1], "-a") == 0)
        mod = a_to_u(text);
    else if (strcmp(argv[1], "-u") == 0)
        mod = a_to_u(text);
    else
        printf("Invalid arguments");
    return 0;


    fp = fopen(path, "w");
    if (fp) {
        fprintf(fp, mod);
    } else {
        printf("An error occurred while opening the file.\n");
    }
    fclose(fp);
}

char * a_to_u(char txt[]) {

    std::string str(txt);

    if (str.empty())
        return char{};
    int size_needed = MultiByteToWideChar(CP_ACP, 0, &str[0], (int)str.size(), NULL, 0);
    std::wstring wstr(size_needed, 0);
    MultiByteToWideChar(CP_ACP, 0, &str[0], (int)str.size(), &wstr[0], size_needed);

    size_needed = WideCharToMultiByte(CP_UTF8, 0, &wstr[0], (int)wstr.size(), NULL, 0, NULL, NULL);
    std::string strTo(size_needed, 0);
    WideCharToMultiByte(CP_UTF8, 0, &wstr[0], (int)wstr.size(), &strTo[0], size_needed, NULL, NULL);

    strcpy(txt, strTo.c_str());
    return txt;
}

char * u_to_a(char txt[]) {

    std::string str(txt);

    if (str.empty())
        return char{};
    int size_needed = MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), NULL, 0);
    std::wstring wstr(size_needed, 0);
    MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), &wstr[0], size_needed);

    size_needed = WideCharToMultiByte(CP_ACP, 0, &wstr[0], (int)wstr.size(), NULL, 0, NULL, NULL);
    std::string strTo(size_needed, 0);
    WideCharToMultiByte(CP_ACP, 0, &wstr[0], (int)wstr.size(), &strTo[0], size_needed, NULL, NULL);

    strcpy(txt, strTo.c_str());
    return txt;
}