#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <errno.h>

#include <patty/ax25.h>

static void usage(int argc, char **argv, const char *message, ...) {
    if (message != NULL) {
        va_list args;

        va_start(args, message);
        vfprintf(stderr, message, args);
         fprintf(stderr, "\n");
        va_end(args);
    }

    fprintf(stderr, "usage: %s /var/run/patty/patty.sock remotecall\n", argv[0]);

    exit(1);
}

int main(int argc, char **argv) {
    struct sockaddr_un addr;

    int fd,
        sock,
        pty;

    patty_ax25_addr peer;
    char path[PATTY_AX25_SOCK_PATH_SIZE];

    uint8_t buf[4096];
    ssize_t readlen;

    if (argc < 2) {
        usage(argc, argv, "No patty socket provided");
    } else if (argc < 3) {
        usage(argc, argv, "No remote callsign provided");
    } else if (argc > 3) {
        usage(argc, argv, "Too many arguments provided");
    }

    patty_ax25_pton(argv[2], 0, &peer);

    if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
        fprintf(stderr, "%s: %s: %s: %s\n",
            argv[0], "socket()", argv[1], strerror(errno));

        goto error_socket;
    }

    memset(&addr, '\0', sizeof(addr));
    addr.sun_family = AF_UNIX;
    strncpy(addr.sun_path, argv[1], sizeof(addr.sun_path));

    if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
        goto error_connect;
    }

    if ((sock = patty_ax25_call_socket(fd, PATTY_AX25_PROTO_NONE, PATTY_AX25_SOCK_STREAM, path, PATTY_AX25_SOCK_PATH_SIZE)) < 0) {
        fprintf(stderr, "%s: %s: %s\n",
            argv[0], "patty_ax25_call_socket()", strerror(errno));

        goto error_call_socket;
    }

    if (patty_ax25_call_connect(fd, sock, &peer) < 0) {
        fprintf(stderr, "%s: %s: %s\n",
            argv[0], "patty_ax25_call_connect()", strerror(errno));

        goto error_call_connect;
    }

    if ((pty = open(path, O_RDWR)) < 0) {
        fprintf(stderr, "%s: %s: %s: %s\n",
            argv[0], path, "open()", strerror(errno));

        goto error_open_pty;
    }

    while ((readlen = read(pty, buf, sizeof(buf))) > 0) {
        if (write(1, buf, readlen) < 0) {
            goto error_write;
        }
    }

    close(pty);

    patty_ax25_call_close(fd, sock);

    close(fd);

    return 0;

error_write:
error_open_pty:
error_call_connect:
    patty_ax25_call_close(fd, sock);

error_call_socket:
    close(fd);

error_connect:
error_socket:
    return 1;
}