#include <stdio.h>
#include <Windows.h>
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int copy_c(char* originalName, char* copyName)
{
    char buffer[BUFSIZ];

    FILE* oldFile = fopen(originalName, "rb");
    if (oldFile == NULL)
    {
        perror(originalName);
        return EXIT_FAILURE;
    }

    FILE* newFile = fopen(copyName, "wb");
    if (newFile == NULL)
    {
        perror(copyName);
        return EXIT_FAILURE;
    }

    size_t inBytes, outBytes;
    while ((inBytes = fread(buffer, 1, BUFSIZ, oldFile)) > 0)
    {
        outBytes = fwrite(buffer, 1, inBytes, newFile);

        if (outBytes != inBytes)
        {
            perror("Failed to copy file via C functions.");
            return EXIT_FAILURE;
        }
    }

    fclose(oldFile);
    fclose(newFile);

    return EXIT_SUCCESS;
}

int copy_windows(char* originalName, char* copyName)
{
    CHAR buffer[BUFSIZ];

    HANDLE hIn = CreateFile(originalName, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hIn == INVALID_HANDLE_VALUE)
    {
        cout << "Failed to open input file: error code " << GetLastError();
        return EXIT_FAILURE;
    }

    HANDLE hOut = CreateFile(copyName, GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, 0, NULL);
    if (hOut == INVALID_HANDLE_VALUE)
    {
        cout << "Failed to open output file: error code " << GetLastError();
        return EXIT_FAILURE;
    }

    DWORD nIn, nOut;
    while (ReadFile(hIn, buffer, BUFSIZ, &nIn, NULL) && nIn > 0)
    {
        WriteFile(hOut, buffer, nIn, &nOut, NULL);
        if (nIn != nOut)
        {
            cout << "Failed to copy file: error code " << GetLastError();
            return EXIT_FAILURE;
        }
    }

    CloseHandle(hIn);
    CloseHandle(hOut);

    return EXIT_SUCCESS;
}

int copy_copyfile(char* originalName, char* copyName)
{
    int success = CopyFile(originalName, copyName, FALSE);
    if (!success) cout << "Failed to copy file: error code " << GetLastError();
    return success ? EXIT_SUCCESS : EXIT_FAILURE;
}