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

#include <pthread.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include "tcp_common.h"

void *worker(void *arg) {
    int sockfd = *(int *)arg;
    for (;;) {
        char reply[DATA_LEN];
        ssize_t length = recv(sockfd, reply, sizeof(reply), 0);
        if (length <= 0) {
            puts("Lose connection to server");
            shutdown(sockfd, SHUT_RDWR);
            return 0;
        }
        while (reply[strlen(reply) - 1] == '\n') reply[strlen(reply) - 1] = 0;
        switch (reply[0]) {
        case TYPE_MSG: {
            int clino, offset;
            sscanf(reply + 1, "%d\n%n", &clino, &offset);
            offset++;
            printf("--- Message From No.%d ---\n", clino);
            puts(reply + offset);
            puts("--- Message End ---");
            break;
        }
        case TYPE_SUC:
            puts("--- Server Reply Begin ---");
            puts(reply + 1);
            puts("--- Server Reply End ---");
            break;
        case TYPE_ERR:
            puts("--- Server Error Begin ---");
            puts(reply + 1);
            puts("--- Server Error End ---");
            break;
        }
    }
}

int request(int sockfd, char type, char *msg) {
    char data[strlen(msg) + 2];
    data[0] = type;
    data[1] = 0;
    strcat(data, msg);
    return send(sockfd, data, sizeof(data), 0);
}

int main(int argc, char *argv[]) {
    int sockfd = socket(PF_INET, SOCK_STREAM, 0);
    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    for (;;) {
        if (servaddr.sin_family) {
            printf("You have connected to %s:%hd. Please select one option from the list below:\n", inet_ntoa(servaddr.sin_addr), ntohs(servaddr.sin_port));
            puts("1. Disconnect from the server.");
            puts("2. Retrieve the server time.");
            puts("3. Retrieve the server name.");
            puts("4. Retrieve the list of clients.");
            puts("5. Send a message.");
            puts("6. Quit.");
            int number;
            scanf("%d", &number);
            switch (number) {
            case 1:
                shutdown(sockfd, SHUT_RDWR);
                sockfd = socket(PF_INET, SOCK_STREAM, 0);
                memset(&servaddr, 0, sizeof(servaddr));
                break;
            case 2:
                request(sockfd, TYPE_TIME, "");
                break;
            case 3:
                request(sockfd, TYPE_NAME, "");
                break;
            case 4:
                request(sockfd, TYPE_LIST, "");
                break;
            case 5: {
                while (getchar() != '\n');
                char msg[DATA_LEN];
                puts("Enter the number of client to which you want to send the message:");
                fgets(msg, DATA_LEN, stdin);
                puts("Enter the message to send:");
                fgets(msg + strlen(msg), DATA_LEN - strlen(msg), stdin);
                request(sockfd, TYPE_SEND, msg);
                break;
            }
            default:
                shutdown(sockfd, SHUT_RDWR);
                return 0;
            }
        } else {
            puts("You have not connected to a server. Please select one option from the list below:");
            puts("1. Connect.");
            puts("2. Quit.");
            int number;
            scanf("%d", &number);
            switch (number) {
            case 1:
                puts("Enter the IP address and port number: (e.g. 127.0.0.1:80)");
                char ipaddr[IPADDR_LEN];
                in_port_t port;
                scanf("\n%[^:]:%hu", ipaddr, &port);

                servaddr.sin_family = PF_INET;
                inet_aton(ipaddr, &servaddr.sin_addr);
                servaddr.sin_port = htons(port);

                int ret = connect(sockfd, (const struct sockaddr *)&servaddr, sizeof(servaddr));
                if (ret == 0) {
                    pthread_t tid;
                    pthread_create(&tid, NULL, worker, &sockfd);
                } else {
                    memset(&servaddr, 0, sizeof(servaddr));
                    puts("Connection failed");
                }
                break;
            default:
                return 0;
            }
        }
    }
}