/* $Id$ */

/***
  This file is part of polypaudio.
 
  polypaudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser 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 Lesser 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 <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <lirc/lirc_client.h>
#include <stdlib.h>

#include <polypcore/module.h>
#include <polypcore/log.h>
#include <polypcore/namereg.h>
#include <polypcore/sink.h>
#include <polypcore/xmalloc.h>
#include <polypcore/modargs.h>

#include "module-lirc-symdef.h"

PA_MODULE_AUTHOR("Lennart Poettering")
PA_MODULE_DESCRIPTION("LIRC volume control")
PA_MODULE_VERSION(PACKAGE_VERSION)
PA_MODULE_USAGE("config=<config file> sink=<sink name> appname=<lirc application name>")

static const char* const valid_modargs[] = {
    "config",
    "sink",
    "appname",
    NULL,
};

struct userdata {
    int lirc_fd;
    pa_io_event *io;
    struct lirc_config *config;
    char *sink_name;
    pa_module *module;
    float mute_toggle_save;
};

static int lirc_in_use = 0;

static void io_callback(pa_mainloop_api *io, PA_GCC_UNUSED pa_io_event *e, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void*userdata) {
    struct userdata *u = userdata;
    char *name = NULL, *code = NULL;
    assert(io);
    assert(u);

    if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
        pa_log(__FILE__": lost connection to LIRC daemon.");
        goto fail;
    }
        
    if (events & PA_IO_EVENT_INPUT) {
        char *c;
        
        if (lirc_nextcode(&code) != 0 || !code) {
            pa_log(__FILE__": lirc_nextcode() failed.");
            goto fail;
        }
        
        c = pa_xstrdup(code);
        c[strcspn(c, "\n\r")] = 0;
        pa_log_debug(__FILE__": raw IR code '%s'", c);
        pa_xfree(c);
        
        while (lirc_code2char(u->config, code, &name) == 0 && name) {
            enum { INVALID, UP, DOWN, MUTE, RESET, MUTE_TOGGLE } volchange = INVALID;
            
            pa_log_info(__FILE__": translated IR code '%s'", name);
            
            if (strcasecmp(name, "volume-up") == 0)
                volchange = UP;
            else if (strcasecmp(name, "volume-down") == 0)
                volchange = DOWN;
            else if (strcasecmp(name, "mute") == 0)
                volchange = MUTE;
            else if (strcasecmp(name, "mute-toggle") == 0)
                volchange = MUTE_TOGGLE;
            else if (strcasecmp(name, "reset") == 0)
                volchange = RESET;
            
            if (volchange == INVALID)
                pa_log_warn(__FILE__": recieved unknown IR code '%s'", name);
            else {
                pa_sink *s;
                
                if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK, 1)))
                    pa_log(__FILE__": failed to get sink '%s'", u->sink_name);
                else {
                    pa_volume_t v = pa_cvolume_avg(pa_sink_get_volume(s, PA_MIXER_HARDWARE));
                    pa_cvolume cv;
#define DELTA (PA_VOLUME_NORM/20)

                    switch (volchange) {
                        case UP:
                            v += PA_VOLUME_NORM/20;
                            break;
                            
                        case DOWN:
                            if (v > DELTA)
                                v -= DELTA;
                            else
                                v = PA_VOLUME_MUTED;
                            
                            break;
                            
                        case MUTE:
                            v  = PA_VOLUME_MUTED;
                            break;
                            
                        case RESET:
                            v  = PA_VOLUME_NORM;
                            break;
                            
                        case MUTE_TOGGLE: {

                            if (v > 0) {
                                u->mute_toggle_save = v;
                                v = PA_VOLUME_MUTED;
                            } else
                                v = u->mute_toggle_save;
                        }
                        default:
                            ;
                    }

                    pa_cvolume_set(&cv, PA_CHANNELS_MAX, v);
                    pa_sink_set_volume(s, PA_MIXER_HARDWARE, &cv);
                }
            }
        }
    }

    free(code);

    return;
    
fail:
    u->module->core->mainloop->io_free(u->io);
    u->io = NULL;

    pa_module_unload_request(u->module);

    free(code);
}
    
int pa__init(pa_core *c, pa_module*m) {
    pa_modargs *ma = NULL;
    struct userdata *u;
    assert(c && m);

    if (lirc_in_use) {
        pa_log(__FILE__": module-lirc may no be loaded twice.");
        return -1;
    }
    
    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log(__FILE__": Failed to parse module arguments");
        goto fail;
    }

    m->userdata = u = pa_xmalloc(sizeof(struct userdata));
    u->module = m;
    u->io = NULL;
    u->config = NULL;
    u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
    u->lirc_fd = -1;
    u->mute_toggle_save = 0;

    if ((u->lirc_fd = lirc_init((char*) pa_modargs_get_value(ma, "appname", "polypaudio"), 1)) < 0) {
        pa_log(__FILE__": lirc_init() failed.");
        goto fail;
    }

    if (lirc_readconfig((char*) pa_modargs_get_value(ma, "config", NULL), &u->config, NULL) < 0) {
        pa_log(__FILE__": lirc_readconfig() failed.");
        goto fail;
    }
    
    u->io = c->mainloop->io_new(c->mainloop, u->lirc_fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);

    lirc_in_use = 1;

    pa_modargs_free(ma);
    
    return 0;

fail:

    if (ma)
        pa_modargs_free(ma);

    pa__done(c, m);
    return -1;
}

void pa__done(pa_core *c, pa_module*m) {
    struct userdata *u;
    assert(c);
    assert(m);

    if (!(u = m->userdata))
        return;

    if (u->io)
        m->core->mainloop->io_free(u->io);

    if (u->config)
        lirc_freeconfig(u->config);

    if (u->lirc_fd >= 0)
        lirc_deinit();

    pa_xfree(u->sink_name);
    pa_xfree(u);

    lirc_in_use = 0;
}