#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/wait.h>
#include <sys/un.h>
#include <fcntl.h>
#include <errno.h>

#include <patty/ax25.h>

extern char **environ;

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 localcall\n", argv[0]);

    exit(1);
}

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

    int fd,
        local,
        remote,
        pty;

    patty_ax25_addr addr,
                    peer;

    char path[PATTY_AX25_SOCK_PATH_SIZE];

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

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

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

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

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

        goto error_call_socket;
    }

    if (patty_ax25_call_bind(fd, local, &addr) < 0) {
        fprintf(stderr, "%s: %s: %s\n",
            argv[0], "patty_ax25_call_connect()", strerror(errno));

        goto error_call_bind;
    }

    if (patty_ax25_call_listen(fd, local) < 0) {
        fprintf(stderr, "%s: %s: %s\n",
            argv[0], "patty_ax25_call_listen()", strerror(errno));

        goto error_call_listen;
    }

    if ((remote = patty_ax25_call_accept(fd, local, &peer, path, sizeof(path))) < 0) {
        fprintf(stderr, "%s: %s: %s\n",
            argv[0], "patty_ax25_call_accept()", strerror(errno));

        goto error_call_accept;
    }

    if ((pty = open(path, O_RDWR)) < 0) {
        goto error_open_pty;
    }

    if (write(pty, "hello world\n", 12) < 0) {
        goto error_write;
    }

    close(pty);

    patty_ax25_call_close(fd, remote);
    patty_ax25_call_close(fd, local);

    close(fd);

    return 0;

error_write:
    close(pty);

error_open_pty:
    patty_ax25_call_close(fd, remote);

error_call_accept:
error_call_listen:
error_call_bind:
    patty_ax25_call_close(fd, local);

error_call_socket:
error_connect:
    close(fd);

error_socket:
    return 1;
}