#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <strings.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

#include "common.h"

int main()
{
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
        panic("socket creation error");

    struct sockaddr_in serv_addr;
    bzero(&serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serv_addr.sin_port = htons(8888);

    if (bind(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1)
        panic("socket bind error");

    if (listen(sockfd, SOMAXCONN) == -1)
        panic("socket listen error");

    struct sockaddr_in clnt_addr;
    socklen_t clnt_addr_len = sizeof(clnt_addr);
    bzero(&clnt_addr, sizeof(clnt_addr));

    int clnt_sockfd = accept(sockfd, (struct sockaddr *)&clnt_addr, &clnt_addr_len);
    if (clnt_sockfd == -1)
        panic("socket accept error");

    printf("New client fd %d, ip: %s, port: %d\n", clnt_sockfd, inet_ntoa(clnt_addr.sin_addr), ntohs(clnt_addr.sin_port));

    while (true) {
        char buf[1024];
        bzero(&buf, sizeof(buf));
        ssize_t n_read_bytes = read(clnt_sockfd, buf, sizeof(buf));
        if (n_read_bytes > 0) {
            printf("message from client fd %d: %s\n", clnt_sockfd, buf);
            write(clnt_sockfd, buf, sizeof(buf));
        } else if (n_read_bytes == 0) {
            printf("client fd %d disconnected\n", clnt_sockfd);
            close(clnt_sockfd);
            break;
        } else if (n_read_bytes == -1) {
            close(clnt_sockfd);
            panic("socket read error");
        }
    }
}