#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>

#define PORT 12345
#define BUFFER_SIZE 1024
#define MAX_CLIENTS 5

// Structure to hold client information
struct ClientInfo {
    SOCKET socket;
    struct sockaddr_in address;
};

// Function to handle each client
DWORD WINAPI handleClient(LPVOID lpParam) {
    struct ClientInfo *clientInfo = (struct ClientInfo *)lpParam;
    SOCKET clientSocket = clientInfo->socket;

    // Open and send file
    FILE *fileToSend = fopen&#40;"file_to_send.txt", "rb"&#41;;
    if (!fileToSend) {
        printf("Error opening file\n");
        closesocket(clientSocket);
        free(clientInfo);
        return 1;
    }

    char buffer[BUFFER_SIZE];

    while (1) {
        int bytesRead = fread(buffer, 1, sizeof(buffer), fileToSend);
        if (bytesRead <= 0) {
            break; // End of file or error
        }
        send(clientSocket, buffer, bytesRead, 0);
    }

    printf("File sent to %s:%d\n", inet_ntoa(clientInfo->address.sin_addr), ntohs(clientInfo->address.sin_port));

    // Close the socket and file
    fclose(fileToSend);
    closesocket(clientSocket);
    free(clientInfo);
    return 0;
}

int main() {
    WSADATA wsaData;
    SOCKET serverSocket, clientSocket;
    struct sockaddr_in serverAddr, clientAddr;
    int addrSize = sizeof(struct sockaddr_in);

    // Initialize Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsaData;) != 0) {
        printf("WSAStartup failed\n");
        return 1;
    }

    // Create socket
    if ((serverSocket = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
        printf("Error creating socket: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // Configure server address
    memset(&serverAddr;, 0, sizeof(serverAddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(PORT);
    serverAddr.sin_addr.s_addr = INADDR_ANY;

    // Bind the socket
    if (bind(serverSocket, (struct sockaddr *)&serverAddr;, sizeof(serverAddr)) == SOCKET_ERROR) {
        printf("Error binding socket: %d\n", WSAGetLastError());
        closesocket(serverSocket);
        WSACleanup();
        return 1;
    }

    // Listen for incoming connections
    if (listen(serverSocket, MAX_CLIENTS) == SOCKET_ERROR) {
        printf("Error listening for connections: %d\n", WSAGetLastError());
        closesocket(serverSocket);
        WSACleanup();
        return 1;
    }

    printf("Server listening on port %d...\n", PORT);

    while (1) {
        // Accept a connection
        if ((clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddr;, &addrSize;)) == INVALID_SOCKET) {
            printf("Error accepting connection: %d\n", WSAGetLastError());
            closesocket(serverSocket);
            WSACleanup();
            return 1;
        }

        // Create a new thread to handle the client
        struct ClientInfo *clientInfo = (struct ClientInfo *)malloc(sizeof(struct ClientInfo));
        clientInfo->socket = clientSocket;
        clientInfo->address = clientAddr;

        HANDLE hThread = CreateThread(NULL, 0, handleClient, (LPVOID)clientInfo, 0, NULL);
        if (hThread == NULL) {
            printf("Error creating thread\n");
            closesocket(clientSocket);
            free(clientInfo);
        } else {
            CloseHandle(hThread);
        }
    }

    // Close the server socket
    closesocket(serverSocket);
    WSACleanup();

    return 0;
}