#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>

#define SERV_PORT 10007 /* arbitrary, but client and server must agree */
#define QUEUE_SIZE 10
#define BUF_SIZE 1024

typedef struct user{
    char *name;
    int fd;
    int status; //on ou off
    user *pnext; //apontador para o proximo user
}USER;

typedef struct allUsers{
    int nUsers;
    USER *pfirst;
}ALLUSERS;

typedef struct message{
    char text[50];
    int type; //tipo da mensagem
}MESSAGE;


struct sockaddr_in init_server_info()
{
    struct sockaddr_in servaddr;
    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(SERV_PORT);
    return servaddr;
}
/*
Adicionar um novo user
*/
void addNewUser(ALLUSERS users , int fd, char name[20]);
//    USER *new=malloc(sizeof(USER));
//    new->name=malloc(sizeof(char)*strlen(name)+1);
//    strcpy(new->name,name);
    new->fd=malloc(sizeof(fd));//?
    new->fd=fd;//?
    new->pnext=NULL;
    if(users.nUsers!=0){
        USER *current=users.pfirst;
        while(1){//loop infinito até encontrar o ultimo elemento, quando o encontra coloca o novo asseguir
            if (current->pnext==NULL){
                current->pnext=new;
                break;
            }
            current=current->pnext;
        }
    }
    else
        users.pfirst=new;
users.nUsers++;
}
int main(int argc, char **argv)
{
    /*
	criar a lista ligada de users
    */
    USERS users	= {0,NULL};
    int maxfd, listenfd;
    fd_set rset, allset;
    char buf[BUF_SIZE];
    struct sockaddr_in cliaddr, servaddr;

    listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    servaddr = init_server_info();

    bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));

    listen(listenfd, QUEUE_SIZE);

    maxfd = listenfd;

    FD_ZERO(&allset);
    FD_SET(listenfd, &allset);//watch for new connections
    FD_SET(0, &allset);//watch for something from the keyboard
    for (;;)
    {
        rset = allset;//copia do allset porque sempre que usamos o select ele destroy o fd_set
        int nready = select(maxfd + 1, &rset, NULL, NULL, NULL);//blocks until something happen in the file descriptors watched
        /*
	ciclo para iterar todas as sockets
	*/
	for(int i=0;i<nready;i++){
		if (FD_ISSET(listenfd, &rset))//check if something happen in the listenfd (new connection)
        	{
            		printf("Read from socket %d\n",i);
            		socklen_t clilen = sizeof(cliaddr);
            		int connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &clilen);//connfd= fd da nova coneção
			/*
			add á lista ligada o novo user
			*/
			addNewUser(users,connfd,?);

            		int bytes = read(connfd, buf, BUF_SIZE);
            		write(1, buf, bytes);
            		write(1,"\n",2);
        	}
        	else if (FD_ISSET(0, &rset)) //check if something happen in the stdin (new input from the keyboard)
        	{
            		printf("Read from keyboard\n");
            		int bytes = read(0, buf, BUF_SIZE);
            		write(1, buf, bytes);
        	}
	}
    }
}