/* $Id$ */

/***
  This file is part of polypaudio.
 
  polypaudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.
 
  polypaudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with polypaudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "socket-server.h"
#include "socket-util.h"
#include "xmalloc.h"

struct pa_socket_server {
    int ref;
    int fd;
    char *filename;

    void (*on_connection)(struct pa_socket_server*s, struct pa_iochannel *io, void *userdata);
    void *userdata;

    struct pa_io_event *io_event;
    struct pa_mainloop_api *mainloop;
    enum { SOCKET_SERVER_GENERIC, SOCKET_SERVER_IPV4, SOCKET_SERVER_UNIX } type;
};

static void callback(struct pa_mainloop_api *mainloop, struct pa_io_event *e, int fd, enum pa_io_event_flags f, void *userdata) {
    struct pa_socket_server *s = userdata;
    struct pa_iochannel *io;
    int nfd;
    assert(s && s->mainloop == mainloop && s->io_event == e && e && fd >= 0 && fd == s->fd);

    pa_socket_server_ref(s);
    
    if ((nfd = accept(fd, NULL, NULL)) < 0) {
        fprintf(stderr, "accept(): %s\n", strerror(errno));
        goto finish;
    }

    if (!s->on_connection) {
        close(nfd);
        goto finish;
    }

    /* There should be a check for socket type here */
    if (s->type == SOCKET_SERVER_IPV4) 
        pa_socket_tcp_low_delay(fd);
    else
        pa_socket_low_delay(fd);
    
    io = pa_iochannel_new(s->mainloop, nfd, nfd);
    assert(io);
    s->on_connection(s, io, s->userdata);

finish:
    pa_socket_server_unref(s);
}

struct pa_socket_server* pa_socket_server_new(struct pa_mainloop_api *m, int fd) {
    struct pa_socket_server *s;
    assert(m && fd >= 0);
    
    s = pa_xmalloc(sizeof(struct pa_socket_server));
    s->ref = 1;
    s->fd = fd;
    s->filename = NULL;
    s->on_connection = NULL;
    s->userdata = NULL;

    s->mainloop = m;
    s->io_event = m->io_new(m, fd, PA_IO_EVENT_INPUT, callback, s);
    assert(s->io_event);

    s->type = SOCKET_SERVER_GENERIC;
    
    return s;
}

struct pa_socket_server* pa_socket_server_ref(struct pa_socket_server *s) {
    assert(s && s->ref >= 1);
    s->ref++;
    return s;
}

struct pa_socket_server* pa_socket_server_new_unix(struct pa_mainloop_api *m, const char *filename) {
    int fd = -1;
    struct sockaddr_un sa;
    struct pa_socket_server *s;
    
    assert(m && filename);

    if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
        fprintf(stderr, "socket(): %s\n", strerror(errno));
        goto fail;
    }

    sa.sun_family = AF_LOCAL;
    strncpy(sa.sun_path, filename, sizeof(sa.sun_path)-1);
    sa.sun_path[sizeof(sa.sun_path) - 1] = 0;

    pa_socket_low_delay(fd);
    
    if (bind(fd, (struct sockaddr*) &sa, SUN_LEN(&sa)) < 0) {
        fprintf(stderr, "bind(): %s\n", strerror(errno));
        goto fail;
    }

    if (listen(fd, 5) < 0) {
        fprintf(stderr, "listen(): %s\n", strerror(errno));
        goto fail;
    }

    s = pa_socket_server_new(m, fd);
    assert(s);

    s->filename = pa_xstrdup(filename);
    s->type = SOCKET_SERVER_UNIX;
    
    return s;
                                                                                                                                                                         
fail:
    if (fd >= 0)
        close(fd);

    return NULL;
}

struct pa_socket_server* pa_socket_server_new_ipv4(struct pa_mainloop_api *m, uint32_t address, uint16_t port) {
    struct pa_socket_server *ss;
    int fd = -1;
    struct sockaddr_in sa;
    int on = 1;

    assert(m && port);

    if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
        fprintf(stderr, "socket(): %s\n", strerror(errno));
        goto fail;
    }

    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
        fprintf(stderr, "setsockopt(): %s\n", strerror(errno));

    pa_socket_tcp_low_delay(fd);
    
    sa.sin_family = AF_INET;
    sa.sin_port = htons(port);
    sa.sin_addr.s_addr = htonl(address);

    if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
        fprintf(stderr, "bind(): %s\n", strerror(errno));
        goto fail;
    }

    if (listen(fd, 5) < 0) {
        fprintf(stderr, "listen(): %s\n", strerror(errno));
        goto fail;
    }

    if ((ss = pa_socket_server_new(m, fd)))
        ss->type = SOCKET_SERVER_IPV4;

    return ss;
    
fail:
    if (fd >= 0)
        close(fd);

    return NULL;
}

static void socket_server_free(struct pa_socket_server*s) {
    assert(s);
    close(s->fd);

    if (s->filename) {
        unlink(s->filename);
        pa_xfree(s->filename);
    }

    s->mainloop->io_free(s->io_event);
    pa_xfree(s);
}

void pa_socket_server_unref(struct pa_socket_server *s) {
    assert(s && s->ref >= 1);

    if (!(--(s->ref)))
        socket_server_free(s);
}

void pa_socket_server_set_callback(struct pa_socket_server*s, void (*on_connection)(struct pa_socket_server*s, struct pa_iochannel *io, void *userdata), void *userdata) {
    assert(s && s->ref >= 1);

    s->on_connection = on_connection;
    s->userdata = userdata;
}