/***
  This file is part of PulseAudio.

  Copyright 2008 Lennart Poettering
  Copyright 2009 Tanu Kaskinen
  Copyright 2013 XXX

  Author: Arun Raghavan <arun.raghavan@collabora.co.uk>

  PulseAudio 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 2.1 of the License,
  or (at your option) any later version.

  PulseAudio 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 PulseAudio; 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 <pulse/xmalloc.h>
#include <pulse/proplist.h>

#include <pulsecore/core.h>
#include <pulsecore/core-util.h>
#include <pulsecore/hashmap.h>
#include <pulsecore/hook-list.h>
#include <pulsecore/modargs.h>
#include <pulsecore/protocol-native.h>
#include <pulsecore/pstream-util.h>
#include <pulsecore/sink-input.h>

#include "module-b2g-policy-symdef.h"

#define DEFAULT_ROLE_PROPERTY PA_PROP_MEDIA_ROLE
#define VOLUME_FACTOR_KEY "b2g-role-volume"

PA_MODULE_AUTHOR("Arun Raghavan");
PA_MODULE_DESCRIPTION("Policy module for Mozilla Firefox OS");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(true);
PA_MODULE_USAGE(
        "role_property=<The property to use for stream types. Defaults to " DEFAULT_ROLE_PROPERTY "> ");

static const char* const valid_modargs[] = {
    "role_property",
    NULL
};

struct userdata {
    pa_core *core;
    char *role_property;
    pa_hashmap *role_volumes;
    pa_hook_slot
        *sink_input_fixate_slot;
};

enum {
    SUBCOMMAND_TEST,
    SUBCOMMAND_GET_ROLE_VOLUME,
    SUBCOMMAND_SET_ROLE_VOLUME,
};

static void apply_volumes(pa_core *c, const char *role, const pa_cvolume *volume) {
    pa_sink_input *i;
    uint32_t idx;

    PA_IDXSET_FOREACH(i, c->sink_inputs, idx) {
        const char *si_role = pa_proplist_gets(i->proplist, DEFAULT_ROLE_PROPERTY);

        if (pa_safe_streq(role, si_role)) {
            /* Remove previous setting, if any */
            pa_sink_input_remove_volume_factor(i, VOLUME_FACTOR_KEY);
            /* Now add the new volume factor in */
            pa_sink_input_add_volume_factor(i, VOLUME_FACTOR_KEY, volume);
        }
    }
}

#define EXT_VERSION 1

static int extension_cb(pa_native_protocol *p, pa_module *m, pa_native_connection *c, uint32_t tag, pa_tagstruct *t) {
    struct userdata *u;
    uint32_t command;
    pa_tagstruct *reply = NULL;

    pa_assert(p);
    pa_assert(m);
    pa_assert(c);
    pa_assert(t);

    u = m->userdata;

    if (pa_tagstruct_getu32(t, &command) < 0)
        goto fail;

    reply = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);

    switch (command) {
        case SUBCOMMAND_TEST: {
            if (!pa_tagstruct_eof(t)) {
                pa_log_warn("Bad arguments to subcommand test");
                goto fail;
            }

            pa_tagstruct_putu32(reply, EXT_VERSION);
            break;
        }

        case SUBCOMMAND_GET_ROLE_VOLUME: {
            const char *role;
            pa_cvolume *vol, invalid;

            if (pa_tagstruct_gets(t, &role) < 0 ||
                !pa_tagstruct_eof(t)) {
                pa_log_warn("Bad arguments to subcommand get-role-volume");
                goto fail;
            }

            vol = pa_hashmap_get(u->role_volumes, role);

            if (!vol) {
                /* We could return 1.0 here, but returning "invalid" lets the
                 * client know that there isn't an explicit setting. */
                pa_cvolume_init(&invalid);
                vol = &invalid;
            }

            pa_tagstruct_put_cvolume(reply, vol);
            break;
        }

        case SUBCOMMAND_SET_ROLE_VOLUME: {
            const char *role;
            pa_cvolume vol, *entry;

            if (pa_tagstruct_gets(t, &role) < 0 ||
                pa_tagstruct_get_cvolume(t, &vol) < 0 || !pa_cvolume_valid(&vol) ||
                !pa_tagstruct_eof(t)) {
                pa_log_warn("Bad arguments to subcommand set-role-volume");
                goto fail;
            }

            /* Valid volume, add this entry */
            entry = pa_hashmap_get(u->role_volumes, role);

            if (entry) {
                pa_log_debug("Updating role volume for '%s'", role);
                *entry = vol;
            } else {
                pa_log_debug("Storing role volume for '%s'", role);
                entry = pa_xnewdup(pa_cvolume, &vol, 1);
                pa_hashmap_put(u->role_volumes, pa_xstrdup(role), entry);
            }

            apply_volumes(u->core, role, &vol);

            break;
        }
    }

    pa_pstream_send_tagstruct(pa_native_connection_get_pstream(c), reply);
    return 0;

fail:
    if (reply)
        pa_tagstruct_free(reply);

    return -1;
}

static pa_hook_result_t sink_input_fixate_cb(pa_core *core, pa_sink_input_new_data *new_data, struct userdata *u) {
    const pa_cvolume *vol;
    const char *role;

    pa_core_assert_ref(core);
    pa_assert(u);
    pa_assert(new_data);

    role = pa_proplist_gets(new_data->proplist, u->role_property);

    if (role) {
        vol = pa_hashmap_get(u->role_volumes, role);

        if (vol) {
            /* We have a stored volume factor, apply */
            pa_log_debug("Setting volume factor setting for new '%s' stream", role);
            pa_sink_input_new_data_add_volume_factor(new_data, VOLUME_FACTOR_KEY, vol);
        }
    }

    return PA_HOOK_OK;
}

int pa__init(pa_module *m) {
    pa_modargs *ma = NULL;
    pa_native_protocol *p;
    struct userdata *u;

    pa_assert(m);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log("Failed to parse module arguments");
        goto fail;
    }

    m->userdata = u = pa_xnew(struct userdata, 1);

    u->core = m->core;
    u->role_volumes = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, pa_xfree, pa_xfree);

    u->role_property = pa_xstrdup(pa_modargs_get_value(ma, "role_property", DEFAULT_ROLE_PROPERTY));

    p = pa_native_protocol_get(u->core);
    pa_native_protocol_install_ext(p, m, extension_cb);

    u->sink_input_fixate_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_FIXATE], PA_HOOK_LATE,
                    (pa_hook_cb_t) sink_input_fixate_cb, u);

    pa_modargs_free(ma);

    return 0;

fail:
    pa__done(m);

    if (ma)
        pa_modargs_free(ma);

    return -1;


}

void pa__done(pa_module *m) {
    struct userdata* u;

    pa_assert(m);

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

    if (u->role_volumes)
        pa_hashmap_free(u->role_volumes);

    if (u->role_property)
        pa_xfree(u->role_property);

    if (u->sink_input_fixate_slot)
        pa_hook_slot_free(u->sink_input_fixate_slot);

    pa_xfree(u);
}