/*
    C socket server example, handles multiple clients using threads
    Compile
    gcc server.c -lpthread -o server
*/


#include <bits/stdc++.h>


using namespace std;
void parsing(char* c);

void *connection_handler(void *);//the thread function
void getRequest(string fileName);
void postRequest();
int main(int argc , char *argv[])
{
    printf("%d\n",argc);
    if(argc < 2)
    {
     puts("no port number specified ");
     return 1;
    }
    int socket_desc , client_sock , c;
    struct sockaddr_in server , client;

    //Create socket
    socket_desc = socket(AF_INET , SOCK_STREAM , 0);
    if (socket_desc == -1)
    {
        printf("Could not create socket");
    }
    puts("Socket created");

    //Prepare the sockaddr_in structure
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons( argv[1] ); //get port number from the terminal

    //Bind
    if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
    {
        //print the error message
        perror("bind failed. Error");
        return 1;
    }
    puts("bind done");

    //Listen
    listen(socket_desc , 50); // handle 50 request


    //Accept and incoming connection
    puts("Waiting for incoming connections...");
    c = sizeof(struct sockaddr_in);
    pthread_t thread_id;

    while( (client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )
    {
        puts("Connection accepted");

        if( pthread_create( &thread_id , NULL ,  connection_handler , (void*) &client_sock) < 0)
        {
            perror("could not create thread");
            return 1;
        }

        //Now join the thread , so that we dont terminate before the thread
        //pthread_join( thread_id , NULL);
        puts("Handler assigned");
    }

    if (client_sock < 0)
    {
        perror("accept failed");
        return 1;
    }

    return 0;
}

/*
 * This will handle connection for each client
 * */
void *connection_handler(void *socket_desc)
{
    //Get the socket descriptor
    int sock = *(int*)socket_desc;
    int read_size;
    char *message , client_message[2000];

    //Send some messages to the client
    message = "Greetings! I am your connection handler\n";
    write(sock , message , strlen(message));

    message = "Now type something and i shall repeat what you type \n";
    write(sock , message , strlen(message));

    //Receive a message from client
    while( (read_size = recv(sock , client_message , 2000 , 0)) > 0 )
    {
        client_message[read_size] = '\0';//end of string marker
        parsing(client_message);
        memset(client_message, 0, 2000);//clear the message buffer
    }

    if(read_size == 0)
    {
        puts("Client disconnected");
        fflush(stdout);
    }
    else if(read_size == -1)
    {
        perror("recv failed");
    }

    return 0;
}
void parsing(char *c){
    istringstream iss(c);
    vector<string> tokens;
    copy(istream_iterator<string>(iss),istream_iterator<string>(),back_inserter(tokens));
    if(tokens[0]=="get"){
    getRequest(tokens[1]);
    }
    else if (tokens[0]=="post"){
    postRequest();
    }


}
void getRequest(string fileName){

}
void postRequest(){

}