#include <stdio.h>
#include <winsock2.h>
#include <windows.h>
#include <wininet.h>

int main() {
    // Socket 
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("Failed to initialize Winsock.\n");
        return 1;
    }

    SOCKET clientSocket;
    clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == INVALID_SOCKET) {
        printf("Failed to create socket.\n");
        WSACleanup();
        return 1;
    }

    // InternetOpenURL 
    HINTERNET hInternet = InternetOpen("MyApplication", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
    if (hInternet == NULL) {
        printf("Failed to initialize WinINet.\n");
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    HINTERNET hURL = InternetOpenUrl(hInternet, "http://www..com", NULL, 0, INTERNET_FLAG_RELOAD, 0);
    if (hURL == NULL) {
        printf("Failed to open URL.\n");
        InternetCloseHandle(hInternet);
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    // CreateFile, WriteFile, CloseHandle 
    HANDLE hFile = CreateFile("output.txt", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) {
        printf("Failed to create file.\n");
        InternetCloseHandle(hURL);
        InternetCloseHandle(hInternet);
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    char buffer[1024];
    DWORD bytesRead;
    DWORD bytesWritten;
    while (InternetReadFile(hURL, buffer, sizeof(buffer), &bytesRead) && bytesRead > 0) {
        WriteFile(hFile, buffer, bytesRead, &bytesWritten, NULL);
    }

    CloseHandle(hFile);
    InternetCloseHandle(hURL);
    InternetCloseHandle(hInternet);
    closesocket(clientSocket);
    WSACleanup();

    // RegEnumKey 
    HKEY hKey;
    if (RegOpenKeyEx(HKEY_CURRENT_USER, "Software", 0, KEY_READ, &hKey) != ERROR_SUCCESS) {
        printf("Failed to open registry key.\n");
        return 1;
    }

    char subkeyName[MAX_PATH];
    DWORD subkeySize = sizeof(subkeyName);
    DWORD index = 0;
    while (RegEnumKeyEx(hKey, index, subkeyName, &subkeySize, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) {
        printf("%s\n", subkeyName);
        index++;
        subkeySize = sizeof(subkeyName);
    }

    RegCloseKey(hKey);

    return 0;
}