/*
    Shellexec plugin for DeaDBeeF
    Copyright (C) 2010-2011 Alexey Yakovenko <waker@users.sf.net>
    Copyright (C) 2010 Viktor Semykin <thesame.ml@gmail.com>

    This program 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.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
    Configuration scheme:

    shellexec.NN shcmd:title:name:flags
    
    @shcmd is the command executed by the shell
        formating directives are allowed, see
        format_shell_command function

    @title is the title of command displayed in UI

    @name used for referencing command, for example in hotkeys
        configuration

    @flags comma-separated of command flags, allowed flags are:
        single - command allowed only for single track
        local - command allowed only for local files
        remote - command allowed only for non-local files
        disabled - ignore command
*/

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

#include "../../deadbeef.h"

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

static DB_misc_t plugin;
static DB_functions_t *deadbeef;

//Probably it's reasonable to move these flags to parent struct
enum {
    SHX_ACTION_LOCAL_ONLY       = 1 << 0,
    SHX_ACTION_REMOTE_ONLY      = 1 << 1
};

typedef struct Shx_action_s
{
    DB_plugin_action_t parent;

    const char *shcommand;
    uint32_t shx_flags;
} Shx_action_t;

static Shx_action_t *actions;

DB_plugin_t *
shellexec_load (DB_functions_t *api) {
    deadbeef = api;
    return DB_PLUGIN (&plugin);
}

static char*
trim (char* s)
{
    char *h, *t;
    
    for (h = s; *h == ' ' || *h == '\t'; h++);
    for (t = s + strlen (s)-1; *t == ' ' || *t == '\t'; t--);
    *(t+1) = 0;
    return h;
}

static int
shx_callback (Shx_action_t *action, DB_playItem_t *it)
{
    char cmd[_POSIX_ARG_MAX];
    int res = deadbeef->pl_format_title_escaped (it, -1, cmd, sizeof (cmd) - 2, -1, action->shcommand);
    if (res < 0) {
        trace ("shellexec: failed to format string for execution (too long?)\n");
        return -1;
    }
    strcat (cmd, "&");
    trace ("%s\n", cmd);
    system (cmd);
    return 0;
}

static DB_plugin_action_t *
shx_get_actions (DB_playItem_t *it)
{
    int is_local = it ? deadbeef->is_local_file (deadbeef->pl_find_meta (it, ":URI")) : 1;

    Shx_action_t *action;
    for (action = actions; action; action = (Shx_action_t *)action->parent.next)
    {
        if (((action->shx_flags & SHX_ACTION_LOCAL_ONLY) && !is_local) ||
            ((action->shx_flags & SHX_ACTION_REMOTE_ONLY) && is_local))
            action->parent.flags |= DB_ACTION_DISABLED;
        else
            action->parent.flags &= ~DB_ACTION_DISABLED;
    }
    return (DB_plugin_action_t *)actions;
}

static int
shx_start ()
{
    actions = NULL;
    Shx_action_t *prev = NULL;

    DB_conf_item_t *item = deadbeef->conf_find ("shellexec.", NULL);
    while (item)
    {
        size_t l = strlen (item->value) + 1;
        char tmp[l];
        char *tmpptr;
        strcpy (tmp, item->value);
        trace ("Shellexec: %s\n", tmp);

        char *args[4] = {0};

        int idx = 0;
        char *p = tmp;
        while (idx < 4 && p) {
            char *e = strchr (p, ':');
            args[idx++] = p;
            if (!e) {
                break;
            }
            *e = 0;
            p = e+1;
        }

        if (idx < 2)
        {
            fprintf (stderr, "Shellexec: need at least command and title (%s)\n", item->value);
            continue;
        }

        const char *command = trim (args[0]);
        const char *title = trim (args[1]);
        const char *name = trim (args[2]);
        const char *flags = trim (args[3]);
        if (!name) {
            name = "noname";
        }
        if (!flags) {
            flags = "local";
        }

        if (strstr (flags, "disabled"))
            continue;

        Shx_action_t *action = calloc (sizeof (Shx_action_t), 1);

        action->parent.title = strdup (title);
        action->parent.name = strdup (name);
        action->shcommand = strdup (command);
        action->parent.callback = (DB_plugin_action_callback_t)shx_callback;
        action->parent.flags = DB_ACTION_SINGLE_TRACK;
        action->parent.next = NULL;

        action->shx_flags = 0;

        if (strstr (flags, "local"))
            action->shx_flags |= SHX_ACTION_LOCAL_ONLY;

        if (strstr (flags, "remote"))
            action->shx_flags |= SHX_ACTION_REMOTE_ONLY;

        if (0 == strstr (flags, "single"))
            action->parent.flags |= DB_ACTION_ALLOW_MULTIPLE_TRACKS;

        if (prev)
            prev->parent.next = (DB_plugin_action_t *)action;
        prev = action;

        if (!actions)
            actions = action;

        item = deadbeef->conf_find ("shellexec.", item);
    }
    return 0;
}

// define plugin interface
static DB_misc_t plugin = {
    .plugin.api_vmajor = DB_API_VERSION_MAJOR,
    .plugin.api_vminor = DB_API_VERSION_MINOR,
    .plugin.version_major = 1,
    .plugin.version_minor = 0,
    .plugin.type = DB_PLUGIN_MISC,
    .plugin.id = "shellexec",
    .plugin.name = "Shell commands",
    .plugin.descr = "Executes configurable shell commands for tracks\n"
    "This plugin doesn't have GUI configuration yet. Please setup manually in config file\n"
    "Syntax:\n"
    "shellexec.NN shcmd:title:name:flags\n\n"
    "NN is any (unique) number, e.g. 01, 02, 03, etc\n\n"
    "shcmd is the command to execute, supports title formatting\n\n"
    "title is the name of command displayed in UI (context menu)\n\n"
    "name used for referencing commands from other plugins, e.g hotkeys\n\n"
    "flags comma-separated of command flags, allowed flags are:\n"
    "    single - command allowed only for single track\n"
    "    local - command allowed only for local files\n"
    "    remote - command allowed only for non-local files\n"
    "    disabled - ignore command\n\n"
    "EXAMPLE: shellexec.00 notify-send \"%a - %t\":Show selected track:notify:singe\n"
    "this would show the name of selected track in notification popup"
    ,
    .plugin.copyright = 
        "Copyright (C) 2010-2011 Alexey Yakovenko <waker@users.sf.net>\n"
        "Copyright (C) 2010 Viktor Semykin <thesame.ml@gmail.com>\n"
        "\n"
        "This program is free software; you can redistribute it and/or\n"
        "modify it under the terms of the GNU General Public License\n"
        "as published by the Free Software Foundation; either version 2\n"
        "of the License, or (at your option) any later version.\n"
        "\n"
        "This program is distributed in the hope that it will be useful,\n"
        "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
        "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
        "GNU General Public License for more details.\n"
        "\n"
        "You should have received a copy of the GNU General Public License\n"
        "along with this program; if not, write to the Free Software\n"
        "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.\n"
    ,
    .plugin.website = "http://deadbeef.sf.net",
    .plugin.start = shx_start,
    .plugin.get_actions = shx_get_actions
};