/*
  This file is part of Deadbeef Player source code
  http://deadbeef.sourceforge.net

  application launcher, compatible with GNU/Linux and most other POSIX systems

  Copyright (C) 2009-2013 Alexey Yakovenko

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  Alexey Yakovenko waker@users.sourceforge.net
*/
#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <time.h>
#include <locale.h>
#ifdef __linux__
#include <sys/prctl.h>
#endif
#ifndef __linux__
#define _POSIX_C_SOURCE 1
#endif
#include <limits.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/un.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <signal.h>
#ifdef __linux__
#include <execinfo.h>
#endif
#include <unistd.h>
#include "gettext.h"
#include "playlist.h"
#include "threading.h"
#include "messagepump.h"
#include "streamer.h"
#include "conf.h"
#include "volume.h"
#include "plugins.h"
#include "common.h"
#include "junklib.h"

#ifndef PREFIX
#error PREFIX must be defined
#endif

//#define trace(...) { fprintf(stderr, __VA_ARGS__); }
#define trace(fmt,...)

// some common global variables
char sys_install_path[PATH_MAX]; // see deadbeef->get_prefix
char confdir[PATH_MAX]; // $HOME/.config
char dbconfdir[PATH_MAX]; // $HOME/.config/deadbeef
char dbinstalldir[PATH_MAX]; // see deadbeef->get_prefix
char dbdocdir[PATH_MAX]; // see deadbeef->get_doc_dir
char dbplugindir[PATH_MAX]; // see deadbeef->get_plugin_dir
char dbpixmapdir[PATH_MAX]; // see deadbeef->get_pixmap_dir

char use_gui_plugin[100];

static void
print_help (void) {
	bind_textdomain_codeset (PACKAGE, "");
    fprintf (stdout, _("Usage: deadbeef [options] [--] [file(s)]\n"));
    fprintf (stdout, _("Options:\n"));
    fprintf (stdout, _("   --help  or  -h     Print help (this message) and exit\n"));
    fprintf (stdout, _("   --quit             Quit player\n"));
    fprintf (stdout, _("   --version          Print version info and exit\n"));
    fprintf (stdout, _("   --play             Start playback\n"));
    fprintf (stdout, _("   --stop             Stop playback\n"));
    fprintf (stdout, _("   --pause            Pause playback\n"));
    fprintf (stdout, _("   --toggle-pause     Toggle pause\n"));
    fprintf (stdout, _("   --play-pause       Start playback if stopped, toggle pause otherwise\n"));
    fprintf (stdout, _("   --next             Next song in playlist\n"));
    fprintf (stdout, _("   --prev             Previous song in playlist\n"));
    fprintf (stdout, _("   --random           Random song in playlist\n"));
    fprintf (stdout, _("   --queue            Append file(s) to existing playlist\n"));
    fprintf (stdout, _("   --gui PLUGIN       Tells which GUI plugin to use, default is \"GTK2\"\n"));
    fprintf (stdout, _("   --nowplaying FMT   Print formatted track name to stdout\n"));
    fprintf (stdout, _("                      FMT %%-syntax: [a]rtist, [t]itle, al[b]um,\n"
                "                      [l]ength, track[n]umber, [y]ear, [c]omment,\n"
                "                      copy[r]ight, [e]lapsed\n"));
    fprintf (stdout, _("                      e.g.: --nowplaying \"%%a - %%t\" should print \"artist - title\"\n"));
    fprintf (stdout, _("                      for more info, see %s\n"), "http://github.com/Alexey-Yakovenko/deadbeef/wiki/Title-formatting");
	bind_textdomain_codeset (PACKAGE, "UTF-8");
}

// Parse command line an return a single buffer with all
// parameters concatenated (separated by \0).  File names
// are resolved.
char*
prepare_command_line (int argc, char *argv[], int *size) {
    int seen_ddash = 0;

    // initial buffer limit, will expand if needed
    int limit = 4096;
    char *buf = (char*) malloc (limit);

    if (argc <= 1) {
        buf[0] = 0;
        *size = 1;
        return buf;
    }

    int p = 0;
    for (int i = 1; i < argc; i++) {
        // if argument is a filename, try to resolve it
        char resolved[PATH_MAX];
        char *arg;
        if (!strncmp ("--", argv[i], 2) && !seen_ddash || !realpath (argv[i], resolved)) {
            arg = argv[i];
        }
        else {
            arg = resolved;
        }

        // make sure that there is enough space in the buffer;
        // re-allocate, if needed
        int arglen = strlen(arg) + 1;
        while (p + arglen >= limit) {
            char *newbuf = (char*) malloc (limit * 2);
            memcpy (newbuf, buf, p);
            free (buf);
            limit *= 2;
            buf = newbuf;
        }

        memcpy (buf + p, arg, arglen);
        p += arglen;

        if (!strcmp("--", argv[i])) {
            seen_ddash = 1;
        }
    }

    *size = p;
    return buf;
}


// this function executes server-side commands only
// must be called only from within server
// -1 error, program must exit with error code -1
//  0 proceed normally as nothing happened
//  1 no error, but program must exit with error code 0
//  2 don't load playlist on startup
//  when executed in remote server -- error code will be ignored
int
server_exec_command_line (const char *cmdline, int len, char *sendback, int sbsize) {
    if (sendback) {
        sendback[0] = 0;
    }
    const uint8_t *parg = (const uint8_t *)cmdline;
    const uint8_t *pend = cmdline + len;
    int queue = 0;
    while (parg < pend) {
        if (!strcmp (parg, "--nowplaying")) {
            parg += strlen (parg);
            parg++;
            if (parg >= pend) {
                if (sendback) {
                    snprintf (sendback, sbsize, "error --nowplaying expects format argument\n");
                    return 0;
                }
                else {
                    fprintf (stderr, "--nowplaying expects format argument\n");
                    return -1;
                }
            }
            if (sendback) {
                playItem_t *curr = streamer_get_playing_track ();
                DB_fileinfo_t *dec = streamer_get_current_fileinfo ();
                if (curr && dec) {
                    const char np[] = "nowplaying ";
                    memcpy (sendback, np, sizeof (np)-1);
                    pl_format_title (curr, -1, sendback+sizeof(np)-1, sbsize-sizeof(np)+1, -1, parg);
                }
                else {
                    strcpy (sendback, "nowplaying nothing");
                }
                if (curr) {
                    pl_item_unref (curr);
                }
            }
            else {
                char out[2048];
                playItem_t *curr = streamer_get_playing_track ();
                DB_fileinfo_t *dec = streamer_get_current_fileinfo();
                if (curr && dec) {
                    pl_format_title (curr, -1, out, sizeof (out), -1, parg);
                }
                else {
                    strcpy (out, "nothing");
                }
                if (curr) {
                    pl_item_unref (curr);
                }
                fwrite (out, 1, strlen (out), stdout);
                return 1; // exit
            }
        }
        else if (!strcmp (parg, "--next")) {
            messagepump_push (DB_EV_NEXT, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--prev")) {
            messagepump_push (DB_EV_PREV, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--play")) {
            messagepump_push (DB_EV_PLAY_CURRENT, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--stop")) {
            messagepump_push (DB_EV_STOP, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--pause")) {
            messagepump_push (DB_EV_PAUSE, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--toggle-pause")) {
            messagepump_push (DB_EV_TOGGLE_PAUSE, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--play-pause")) {
            int state = deadbeef->get_output ()->state ();
            if (state == OUTPUT_STATE_PLAYING) {
                deadbeef->sendmessage (DB_EV_PAUSE, 0, 0, 0);
            }
            else {
                deadbeef->sendmessage (DB_EV_PLAY_CURRENT, 0, 0, 0);
            }
            return 0;
        }
        else if (!strcmp (parg, "--random")) {
            messagepump_push (DB_EV_PLAY_RANDOM, 0, 0, 0);
            return 0;
        }
        else if (!strcmp (parg, "--queue")) {
            queue = 1;
        }
        else if (!strcmp (parg, "--quit")) {
            messagepump_push (DB_EV_TERMINATE, 0, 0, 0);
        }
        else if (!strcmp (parg, "--sm-client-id")) {
            parg += strlen (parg);
            parg++;
            if (parg < pend) {
                parg += strlen (parg);
                parg++;
            }
            continue;
        }
        else if (!strcmp (parg, "--gui")) {
            // need to skip --gui here, it is handled in the client cmdline
            parg += strlen (parg);
            parg++;
            if (parg >= pend) {
                break;
            }
            parg += strlen (parg);
            parg++;
            continue;
        }
        else if (parg[0] != '-') {
            break; // unknown option is filename
        }
        parg += strlen (parg);
        parg++;
    }
    if (parg < pend) {
        if (conf_get_int ("cli_add_to_specific_playlist", 1)) {
            char str[200];
            conf_get_str ("cli_add_playlist_name", "Default", str, sizeof (str));
            int idx = plt_find (str);
            if (idx < 0) {
                idx = plt_add (plt_get_count (), str);
            }
            if (idx >= 0) {
                plt_set_curr_idx (idx);
            }
        }
        playlist_t *curr_plt = plt_get_curr ();
        if (plt_add_files_begin (curr_plt, 0) != 0) {
            plt_unref (curr_plt);
            snprintf (sendback, sbsize, "it's not allowed to add files to playlist right now, because another file adding operation is in progress. please try again later.");
            return 0;
        }
        // add files
        if (!queue) {
            plt_clear (curr_plt);
            messagepump_push (DB_EV_PLAYLISTCHANGED, 0, 0, 0);
            plt_reset_cursor (curr_plt);
        }
        while (parg < pend) {
            char resolved[PATH_MAX];
            const char *pname;
            if (realpath (parg, resolved)) {
                pname = resolved;
            }
            else {
                pname = parg;
            }
            if (deadbeef->plt_add_dir2 (0, (ddb_playlist_t*)curr_plt, pname, NULL, NULL) < 0) {
                if (deadbeef->plt_add_file2 (0, (ddb_playlist_t*)curr_plt, pname, NULL, NULL) < 0) {
                    int ab = 0;
                    playItem_t *it = plt_load2 (0, curr_plt, NULL, pname, &ab, NULL, NULL);
                    if (!it) {
                        fprintf (stderr, "failed to add file or folder %s\n", pname);
                    }
                }
            }
            parg += strlen (parg);
            parg++;
        }
        messagepump_push (DB_EV_PLAYLIST_REFRESH, 0, 0, 0);
        plt_add_files_end (curr_plt, 0);
        plt_unref (curr_plt);
        if (!queue) {
            messagepump_push (DB_EV_PLAY_NUM, 0, 0, 0);
            return 2; // don't reload playlist at startup
        }
    }
    return 0;
}

static struct sockaddr_un srv_local;
static struct sockaddr_un srv_remote;
static unsigned srv_socket;

#if USE_ABSTRACT_SOCKET_NAME
static char server_id[] = "\0deadbeefplayer";
#endif

int
server_start (void) {
    fprintf (stderr, "server_start\n");
    srv_socket = socket (AF_UNIX, SOCK_STREAM, 0);
    int flags;
    flags = fcntl (srv_socket, F_GETFL,0);
    if (flags == -1) {
        perror ("fcntl F_GETFL");
        return -1;
    }
    if (fcntl(srv_socket, F_SETFL, flags | O_NONBLOCK) < 0) {
        perror ("fcntl F_SETFL");
        return -1;
    }
    memset (&srv_local, 0, sizeof (srv_local));
    srv_local.sun_family = AF_UNIX;

#if USE_ABSTRACT_SOCKET_NAME
    memcpy (srv_local.sun_path, server_id, sizeof (server_id));
    int len = offsetof(struct sockaddr_un, sun_path) + sizeof (server_id)-1;
#else
    char *socketdirenv = getenv ("DDB_SOCKET_DIR");
    snprintf (srv_local.sun_path, sizeof (srv_local.sun_path), "%s/socket", socketdirenv ? socketdirenv : dbconfdir);
    if (unlink(srv_local.sun_path) < 0) {
        perror ("INFO: unlink socket");
    }
    int len = offsetof(struct sockaddr_un, sun_path) + strlen (srv_local.sun_path);
#endif

    if (bind(srv_socket, (struct sockaddr *)&srv_local, len) < 0) {
        perror ("bind");
        return -1;
    }

    if (listen(srv_socket, 5) == -1) {
        perror("listen");
        return -1;
    }
    return 0;
}

void
server_close (void) {
    if (srv_socket) {
        close (srv_socket);
        srv_socket = 0;
    }
}

// Read the whole message till end-of-stream
char*
read_entire_message (int sockfd, int *size) {
    int bufsize = 4096; // initial buffer size, will expand if
                        // the actual package turns out to be bigger
    char *buf = (char*) malloc(bufsize);
    int rdp = 0;

    for (;;) {
        if (rdp >= bufsize) {
            int newsize = bufsize * 2;
            char *newbuf = (char*) malloc(newsize);
            memcpy(newbuf, buf, rdp);
            free(buf);
            buf = newbuf;
            bufsize = newsize;
        }

        int rd = recv(sockfd, buf + rdp, bufsize - rdp, 0);
        if (rd < 0) {
            if (errno == EAGAIN) {
                usleep (50000);
                continue;
            }
            free(buf);
            return NULL;
        }
        if (rd == 0) {
            break;
        }
        rdp += rd;
    }

    *size = rdp;
    return buf;
}

int
server_update (void) {
    // handle remote stuff
    int t = sizeof (srv_remote);
    unsigned s2;
    s2 = accept(srv_socket, (struct sockaddr *)&srv_remote, &t);
    if (s2 == -1 && errno != EAGAIN && errno != EWOULDBLOCK) {
        perror("accept");
        return -1;
    }
    else if (s2 != -1) {
        int size = -1;
        char *buf = read_entire_message(s2, &size);
        char sendback[1024] = "";
        if (size > 0) {
            if (size == 1 && buf[0] == 0) {
                // FIXME: that should be called right after activation of gui plugin
                messagepump_push (DB_EV_ACTIVATED, 0, 0, 0);
            }
            else {
                server_exec_command_line (buf, size, sendback, sizeof (sendback));
            }
        }
        if (sendback[0]) {
            // send nowplaying back to client
            send (s2, sendback, strlen (sendback)+1, 0);
        }
        else {
            send (s2, "", 1, 0);
        }
        close(s2);

        if (buf) {
            free(buf);
        }
    }
    return 0;
}

static uintptr_t server_tid;
static int server_terminate;

void
server_loop (void *ctx) {
#ifdef __linux__
    prctl (PR_SET_NAME, "deadbeef-server", 0, 0, 0, 0);
#endif
    fd_set rds;
    int ret;
    struct timeval timeout = {0, 0};

    FD_ZERO(&rds);
    while (!server_terminate) {
        FD_SET(srv_socket, &rds);
        timeout.tv_usec = 500000;
        if ((ret = select(srv_socket + 1, &rds, NULL, NULL, &timeout)) < 0 && errno != EINTR) {
            perror("select");
            exit (-1);
        }
        if (ret > 0) {
            if (server_update () < 0) {
                messagepump_push (DB_EV_TERMINATE, 0, 0, 0);
            }
        }
    }
}

void
save_resume_state (void) {
    playItem_t *trk = streamer_get_playing_track ();
    DB_output_t *output = plug_get_output ();
    float playpos = -1;
    int playtrack = -1;
    int playlist = streamer_get_current_playlist ();
    int paused = (output->state () == OUTPUT_STATE_PAUSED);
    if (trk && playlist >= 0) {
        playtrack = str_get_idx_of (trk);
        playpos = streamer_get_playpos ();
        pl_item_unref (trk);
    }

    conf_set_float ("resume.position", playpos);
    conf_set_int ("resume.track", playtrack);
    conf_set_int ("resume.playlist", playlist);
    conf_set_int ("resume.paused", paused);
}

void
player_mainloop (void) {
    for (;;) {
        uint32_t msg;
        uintptr_t ctx;
        uint32_t p1;
        uint32_t p2;
        int term = 0;
        while (messagepump_pop(&msg, &ctx, &p1, &p2) != -1) {
            // broadcast to all plugins
            DB_plugin_t **plugs = plug_get_list ();
            for (int n = 0; plugs[n]; n++) {
                if (plugs[n]->message) {
                    plugs[n]->message (msg, ctx, p1, p2);
                }
            }
            if (!term) {
                DB_output_t *output = plug_get_output ();
                switch (msg) {
                case DB_EV_REINIT_SOUND:
                    plug_reinit_sound ();
                    streamer_reset (1);
                    conf_save ();
                    break;
                case DB_EV_TERMINATE:
                    {
                        save_resume_state ();

                        pl_playqueue_clear ();

                        // stop streaming and playback before unloading plugins
                        DB_output_t *output = plug_get_output ();
                        output->stop ();
                        streamer_free ();
                        output->free ();
                        term = 1;
                    }
                    break;
                case DB_EV_PLAY_CURRENT:
                    streamer_play_current_track ();
                    break;
                case DB_EV_PLAY_NUM:
                    pl_playqueue_clear ();
                    streamer_set_nextsong (p1, 4);
                    break;
                case DB_EV_STOP:
                    streamer_set_nextsong (-2, 0);
                    break;
                case DB_EV_NEXT:
                    streamer_move_to_nextsong (1);
                    break;
                case DB_EV_PREV:
                    streamer_move_to_prevsong (1);
                    break;
                case DB_EV_PAUSE:
                    if (output->state () != OUTPUT_STATE_PAUSED) {
                        output->pause ();
                        messagepump_push (DB_EV_PAUSED, 0, 1, 0);
                    }
                    break;
                case DB_EV_TOGGLE_PAUSE:
                    if (output->state () == OUTPUT_STATE_PAUSED) {
                        streamer_play_current_track ();
                    }
                    else {
                        output->pause ();
                        messagepump_push (DB_EV_PAUSED, 0, 1, 0);
                    }
                    break;
                case DB_EV_PLAY_RANDOM:
                    streamer_move_to_randomsong (1);
                    break;
                case DB_EV_PLAYLIST_REFRESH:
                    pl_save_current ();
                    messagepump_push (DB_EV_PLAYLISTCHANGED, 0, 0, 0);
                    break;
                case DB_EV_CONFIGCHANGED:
                    conf_save ();
                    streamer_configchanged ();
                    junk_configchanged ();
                    break;
                case DB_EV_SEEK:
                    streamer_set_seek (p1 / 1000.f);
                    break;
                }
            }
            if (msg >= DB_EV_FIRST && ctx) {
                messagepump_event_free ((ddb_event_t *)ctx);
            }
        }
        if (term) {
            return;
        }
        messagepump_wait ();
    }
}

#ifdef __linux__
void
sigsegv_handler (int sig) {
    fprintf (stderr, "Segmentation Fault\n");
    int j, nptrs;
#define SIZE 100
    void *buffer[100];
    char **strings;

    nptrs = backtrace(buffer, SIZE);
    printf("backtrace() returned %d addresses\n", nptrs);

    /* The call
     * backtrace_symbols_fd(buffer,
     * nptrs,
     * STDOUT_FILENO)
     would produce similar output to the following: */

    strings = backtrace_symbols(buffer, nptrs);
    if (strings == NULL) {
        perror("backtrace_symbols");
        exit(EXIT_FAILURE);
    }

    for (j = 0; j < nptrs; j++)
        printf("%s\n", strings[j]);

    free(strings);
    exit (0);
}
#endif

void
restore_resume_state (void) {
    DB_output_t *output = plug_get_output ();
    if (conf_get_int ("resume_last_session", 0) && output->state () == OUTPUT_STATE_STOPPED) {
        int plt = conf_get_int ("resume.playlist", -1);
        int track = conf_get_int ("resume.track", -1);
        float pos = conf_get_float ("resume.position", -1);
        int paused = conf_get_int ("resume.paused", 0);
        trace ("resume: track %d pos %f playlist %d\n", track, pos, plt);
        if (plt >= 0 && track >= 0 && pos >= 0) {
            streamer_lock (); // need to hold streamer thread to make the resume operation atomic
            streamer_set_current_playlist (plt);
            streamer_set_nextsong (track, paused ? 2 : 3);
            streamer_set_seek (pos);
            streamer_unlock ();
        }
    }
}

uintptr_t mainloop_tid;

DB_plugin_t *
plug_get_gui (void) {
    struct DB_plugin_s **plugs = plug_get_list ();
    for (int i = 0; plugs[i]; i++) {
        if (plugs[i]->type == DB_PLUGIN_GUI) {
            return plugs[i];
        }
    }
    return NULL;
}

static void
mainloop_thread (void *ctx) {
    // this runs until DB_EV_TERMINATE is sent (blocks right here)
    player_mainloop ();

    // tell the gui thread to finish
    DB_plugin_t *gui = plug_get_gui ();
    if (gui) {
        gui->stop ();
    }
    return;
}

int
main (int argc, char *argv[]) {
    int portable = 0;
#if STATICLINK
    int staticlink = 1;
#else
    int staticlink = 0;
#endif
#if PORTABLE
    portable = 1;
    if (!realpath (argv[0], dbinstalldir)) {
        strcpy (dbinstalldir, argv[0]);
    }
    char *e = strrchr (dbinstalldir, '/');
    if (e) {
        *e = 0;
    }
    else {
        fprintf (stderr, "couldn't determine install folder from path %s\n", argv[0]);
        exit (-1);
    }
#else
    if (!realpath (argv[0], dbinstalldir)) {
        strcpy (dbinstalldir, argv[0]);
    }
    char *e = strrchr (dbinstalldir, '/');
    if (e) {
        *e = 0;
        struct stat st;
        char checkpath[PATH_MAX];
        snprintf (checkpath, sizeof (checkpath), "%s/.ddb_portable", dbinstalldir);
        if (!stat (checkpath, &st)) {
            if (S_ISREG (st.st_mode)) {
                portable = 1;
            }
        }
    }
    if (!portable) {
        strcpy (dbinstalldir, PREFIX);
    }
#endif

#ifdef __linux__
    signal (SIGSEGV, sigsegv_handler);
#endif
    setlocale (LC_ALL, "");
    setlocale (LC_NUMERIC, "C");
#ifdef ENABLE_NLS
//    fprintf (stderr, "enabling gettext support: package=" PACKAGE ", dir=" LOCALEDIR "...\n");
    if (portable) {
        char localedir[PATH_MAX];
        snprintf (localedir, sizeof (localedir), "%s/locale", dbinstalldir);
        bindtextdomain (PACKAGE, localedir);
    }
    else {
        bindtextdomain (PACKAGE, LOCALEDIR);
    }
	bind_textdomain_codeset (PACKAGE, "UTF-8");
	textdomain (PACKAGE);
#endif

    fprintf (stderr, "starting deadbeef " VERSION "%s%s\n", staticlink ? " [static]" : "", portable ? " [portable]" : "");
    srand (time (NULL));
#ifdef __linux__
    prctl (PR_SET_NAME, "deadbeef-main", 0, 0, 0, 0);
#endif

#if PORTABLE_FULL
    if (snprintf (confdir, sizeof (confdir), "%s/config", dbinstalldir) > sizeof (confdir)) {
        fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
        return -1;
    }

    strcpy (dbconfdir, confdir);
#else
    char *homedir = getenv ("HOME");
    if (!homedir) {
        fprintf (stderr, "unable to find home directory. stopping.\n");
        return -1;
    }

    char *xdg_conf_dir = getenv ("XDG_CONFIG_HOME");
    if (xdg_conf_dir) {
        if (snprintf (confdir, sizeof (confdir), "%s", xdg_conf_dir) > sizeof (confdir)) {
            fprintf (stderr, "fatal: XDG_CONFIG_HOME value is too long: %s\n", xdg_conf_dir);
            return -1;
        }
    }
    else {
        if (snprintf (confdir, sizeof (confdir), "%s/.config", homedir) > sizeof (confdir)) {
            fprintf (stderr, "fatal: HOME value is too long: %s\n", homedir);
            return -1;
        }
    }
    if (snprintf (dbconfdir, sizeof (dbconfdir), "%s/deadbeef", confdir) > sizeof (dbconfdir)) {
        fprintf (stderr, "fatal: out of memory while configuring\n");
        return -1;
    }
    mkdir (confdir, 0755);
#endif


    if (portable) {
        if (snprintf (dbdocdir, sizeof (dbdocdir), "%s/doc", dbinstalldir) > sizeof (dbdocdir)) {
            fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
            return -1;
        }
        if (snprintf (dbplugindir, sizeof (dbplugindir), "%s/plugins", dbinstalldir) > sizeof (dbplugindir)) {
            fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
            return -1;
        }
        if (snprintf (dbpixmapdir, sizeof (dbpixmapdir), "%s/pixmaps", dbinstalldir) > sizeof (dbpixmapdir)) {
            fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
            return -1;
        }
        mkdir (dbplugindir, 0755);
    }
    else {
        if (snprintf (dbdocdir, sizeof (dbdocdir), "%s", DOCDIR) > sizeof (dbdocdir)) {
            fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
            return -1;
        }
        if (snprintf (dbplugindir, sizeof (dbplugindir), "%s/deadbeef", LIBDIR) > sizeof (dbplugindir)) {
            fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
            return -1;
        }
        if (snprintf (dbpixmapdir, sizeof (dbpixmapdir), "%s/share/deadbeef/pixmaps", PREFIX) > sizeof (dbpixmapdir)) {
            fprintf (stderr, "fatal: too long install path %s\n", dbinstalldir);
            return -1;
        }
    }

    for (int i = 1; i < argc; i++) {
        // help, version and nowplaying are executed with any filter
        if (!strcmp (argv[i], "--help") || !strcmp (argv[i], "-h")) {
            print_help ();
            return 0;
        }
        else if (!strcmp (argv[i], "--version")) {
            fprintf (stderr, "DeaDBeeF " VERSION " Copyright © 2009-2013 Alexey Yakovenko\n");
            return 0;
        }
        else if (!strcmp (argv[i], "--gui")) {
            if (i == argc-1) {
                break;
            }
            i++;
            strncpy (use_gui_plugin, argv[i], sizeof(use_gui_plugin) - 1);
            use_gui_plugin[sizeof(use_gui_plugin) - 1] = 0;
        }
    }

    trace ("installdir: %s\n", dbinstalldir);
    trace ("confdir: %s\n", confdir);
    trace ("docdir: %s\n", dbdocdir);
    trace ("plugindir: %s\n", dbplugindir);
    trace ("pixmapdir: %s\n", dbpixmapdir);

    mkdir (dbconfdir, 0755);

    int size = 0;
    char *cmdline = prepare_command_line (argc, argv, &size);

    // try to connect to remote player
    int s, len;
    struct sockaddr_un remote;

    if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(1);
    }

    memset (&remote, 0, sizeof (remote));
    remote.sun_family = AF_UNIX;
#if USE_ABSTRACT_SOCKET_NAME
    memcpy (remote.sun_path, server_id, sizeof (server_id));
    len = offsetof(struct sockaddr_un, sun_path) + sizeof (server_id)-1;
#else
    char *socketdirenv = getenv ("DDB_SOCKET_DIR");
    snprintf (remote.sun_path, sizeof (remote.sun_path), "%s/socket", socketdirenv ? socketdirenv : dbconfdir);
    len = offsetof(struct sockaddr_un, sun_path) + strlen (remote.sun_path);
#endif
    if (connect(s, (struct sockaddr *)&remote, len) == 0) {
        // pass args to remote and exit
        if (send(s, cmdline, size, 0) == -1) {
            perror ("send");
            exit (-1);
        }
        // end of message
        shutdown(s, SHUT_WR);

        int sz = -1;
        char *out = read_entire_message(s, &sz);
        if (sz == -1) {
            fprintf (stderr, "failed to pass args to remote!\n");
            exit (-1);
        }
        else {
            // check if that's nowplaying response
            const char np[] = "nowplaying ";
            const char err[] = "error ";
            if (!strncmp (out, np, sizeof (np)-1)) {
                const char *prn = &out[sizeof (np)-1];
                fwrite (prn, 1, strlen (prn), stdout);
            }
            else if (!strncmp (out, err, sizeof (err)-1)) {
                const char *prn = &out[sizeof (err)-1];
                fwrite (prn, 1, strlen (prn), stderr);
            }
            else if (sz > 0 && out[0]) {
                fprintf (stderr, "%s\n", out);
            }
        }
        if (out) {
            free (out);
        }
        close (s);
        exit (0);
    }
//    else {
//        perror ("INFO: failed to connect to existing session:");
//    }
    close(s);

    // become a server
    if (server_start () < 0) {
        exit (-1);
    }

    // hack: report nowplaying
    if (!strcmp (cmdline, "--nowplaying")) {
        char nothing[] = "nothing";
        fwrite (nothing, 1, sizeof (nothing)-1, stdout);
        return 0;
    }

    pl_init ();
    conf_init ();
    conf_load (); // required by some plugins at startup

    if (use_gui_plugin[0]) {
        conf_set_str ("gui_plugin", use_gui_plugin);
    }

    conf_set_str ("deadbeef_version", VERSION);

    volume_set_db (conf_get_float ("playback.volume", 0)); // volume need to be initialized before plugins start

    messagepump_init (); // required to push messages while handling commandline
    if (plug_load_all ()) { // required to add files to playlist from commandline
        exit (-1);
    }
    pl_load_all ();
    plt_set_curr_idx (conf_get_int ("playlist.current", 0));

    // execute server commands in local context
    int noloadpl = 0;
    if (argc > 1) {
        int res = server_exec_command_line (cmdline, size, NULL, 0);
        // some of the server commands ran on 1st instance should terminate it
        if (res == 2) {
            noloadpl = 1;
        }
        else if (res > 0) {
            exit (0);
        }
        else if (res < 0) {
            exit (-1);
        }
    }

    free (cmdline);

#if 0
    signal (SIGTERM, sigterm_handler);
    atexit (atexit_handler); // helps to save in simple cases
#endif

    streamer_init ();

    plug_connect_all ();
    messagepump_push (DB_EV_PLUGINSLOADED, 0, 0, 0);

    if (!noloadpl) {
        restore_resume_state ();
    }

    server_tid = thread_start (server_loop, NULL);

    mainloop_tid = thread_start (mainloop_thread, NULL);

    DB_plugin_t *gui = plug_get_gui ();
    if (gui) {
        gui->start ();
    }

    fprintf (stderr, "gui plugin has quit; waiting for mainloop thread to finish\n");
    thread_join (mainloop_tid);

    // terminate server and wait for completion
    if (server_tid) {
        server_terminate = 1;
        thread_join (server_tid);
        server_tid = 0;
    }

    // save config
    pl_save_all ();
    conf_save ();

    // delete legacy session file
    {
        char sessfile[1024]; // $HOME/.config/deadbeef/session
        if (snprintf (sessfile, sizeof (sessfile), "%s/deadbeef/session", confdir) < sizeof (sessfile)) {
            unlink (sessfile);
        }
    }

    // stop receiving messages from outside
    server_close ();

    // plugins might still hold references to playitems,
    // and query configuration in background
    // so unload everything 1st before final cleanup
    plug_disconnect_all ();
    plug_unload_all ();

    // at this point we can simply do exit(0), but let's clean up for debugging
    pl_free (); // may access conf_*
    conf_free ();

    fprintf (stderr, "messagepump_free\n");
    messagepump_free ();
    fprintf (stderr, "plug_cleanup\n");
    plug_cleanup ();

    fprintf (stderr, "hej-hej!\n");

    return 0;
}