/*
 * Copyright (C) 2017-2019 Konsulko Group
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define _GNU_SOURCE

#include <glib.h>
#include <json-c/json.h>
#include <string.h>

#define AFB_BINDING_VERSION 3
#include <afb/afb-binding.h>

#include "ofono_manager.h"
#include "ofono_voicecallmanager.h"
#include "ofono_voicecall.h"

#define OFONO_MODEM_INTERFACE	"org.ofono.Modem"

static OrgOfonoVoiceCallManager *vcm;
static OrgOfonoVoiceCall *incoming_call, *voice_call;
static afb_event_t call_state_changed_event;
static afb_event_t dialing_call_event;
static afb_event_t incoming_call_event;
static afb_event_t terminated_call_event;

static void dial(afb_req_t request)
{
	struct json_object *query, *val;
	const char *number;

	query = afb_req_json(request);
	json_object_object_get_ex(query, "value", &val);
	if (json_object_is_type(val, json_type_string)) {
		number = json_object_get_string(val);
		if (voice_call) {
			AFB_ERROR("dial: cannot dial with active call");
			afb_req_fail(request, "active call", NULL);
		} else {
			AFB_DEBUG("dial: %s...\n", number);
			if (ofono_voicecallmanager_dial(vcm, (gchar *)number, "")) {
				afb_req_success(request, NULL, NULL);
			} else {
				AFB_ERROR("dial: failed to dial number\n");
				afb_req_fail(request, "failed dial", NULL);
			}
		}
	} else {
		AFB_ERROR("dial: no phone number parameter\n");
		afb_req_fail(request, "no number", NULL);
	}
}

static void hangup(afb_req_t request)
{
	if (voice_call) {
		AFB_DEBUG("Hangup voice call\n");
		ofono_voicecall_hangup(voice_call);
		afb_req_success(request, NULL, NULL);
	} else if (incoming_call) {
		AFB_DEBUG("Reject incoming call\n");
		ofono_voicecall_hangup(incoming_call);
		afb_req_success(request, NULL, NULL);
	} else {
		AFB_ERROR("Hangup: no active call");
		afb_req_fail(request, "failed hangup", NULL);
	}
}

static void answer(afb_req_t request)
{
	if (incoming_call) {
		AFB_DEBUG("Answer voice call\n");
		voice_call = incoming_call;
		ofono_voicecall_answer(voice_call);
	} else {
		AFB_ERROR("Answer: no incoming call");
	}
}

static void subscribe(afb_req_t request)
{
	const char *value = afb_req_value(request, "value");
	if(value) {
		if (!strcasecmp(value, "callStateChanged")) {
			afb_req_subscribe(request, call_state_changed_event);
		} else if (!strcasecmp(value, "dialingCall")) {
			afb_req_subscribe(request, dialing_call_event);
		} else if (!strcasecmp(value, "incomingCall")) {
			afb_req_subscribe(request, incoming_call_event);
		} else if (!strcasecmp(value, "terminatedCall")) {
			afb_req_subscribe(request, terminated_call_event);
		} else {
			afb_req_fail(request, "failed", "Invalid event");
			return;
		}
	}

	afb_req_success(request, NULL, NULL);
}

static void unsubscribe(afb_req_t request)
{
	const char *value = afb_req_value(request, "value");
	if(value) {
		if (!strcasecmp(value, "callStateChanged")) {
			afb_req_unsubscribe(request, call_state_changed_event);
		} else if (!strcasecmp(value, "dialingCall")) {
			afb_req_unsubscribe(request, dialing_call_event);
		} else if (!strcasecmp(value, "incomingCall")) {
			afb_req_unsubscribe(request, incoming_call_event);
		} else if (!strcasecmp(value, "terminatedCall")) {
			afb_req_unsubscribe(request, terminated_call_event);
		} else {
			afb_req_fail(request, "failed", "Invalid event");
			return;
		}
	}

	afb_req_success(request, NULL, NULL);
}

static void call_state_changed_cb(OrgOfonoVoiceCall *vc, gchar *state)
{
	struct json_object *call_state;
	call_state = json_object_new_object();
	json_object_object_add(call_state, "state", json_object_new_string(state));
	afb_event_push(call_state_changed_event, call_state);
}

static void incoming_call_cb(OrgOfonoVoiceCallManager *manager, gchar *op, gchar *clip)
{
	struct json_object *call_info;

	call_info = json_object_new_object();
	json_object_object_add(call_info, "clip", json_object_new_string(clip));
	afb_event_push(incoming_call_event, call_info);
	incoming_call = ofono_voicecall_new(op, call_state_changed_cb);
}

static void dialing_call_cb(OrgOfonoVoiceCallManager *manager, gchar *op, gchar *colp)
{
	struct json_object *call_info;

	call_info = json_object_new_object();
	json_object_object_add(call_info, "colp", json_object_new_string(colp));
	afb_event_push(dialing_call_event, call_info);
	voice_call = ofono_voicecall_new(op, call_state_changed_cb);
}

static void terminated_call_cb(OrgOfonoVoiceCallManager *manager, gchar *op)
{
	if (incoming_call) {
		ofono_voicecall_free(incoming_call);
		incoming_call = NULL;
	} else if (voice_call) {
		ofono_voicecall_free(voice_call);
	}
	voice_call = NULL;
	afb_event_push(terminated_call_event, NULL);
}

static void *main_loop_thread(void *unused)
{
	GMainLoop *loop = g_main_loop_new(NULL, FALSE);
	g_main_loop_run(loop);
	return NULL;
}

static int ofono_init_default_modem(void)
{
	int ret = 0;
	const gchar *modem_path = ofono_manager_get_default_modem_path();

	if (modem_path) {
		vcm = ofono_voicecallmanager_init(modem_path,
				incoming_call_cb,
				dialing_call_cb,
				terminated_call_cb);
		if (!vcm) {
			AFB_ERROR("failed to initialize voice call manager\n");
			ret = -1;
		}
	} else {
		AFB_ERROR("default modem not set\n");
		ret = -1;
	}

	return ret;
}

static void ofono_modem_signal_callback(
	GDBusConnection *connection,
	const gchar *sender_name,
	const gchar *object_path,
	const gchar *interface_name,
	const gchar *signal_name,
	GVariant *parameters,
	gpointer user_data)
{
	GVariant *var = NULL;
	const gchar *key = NULL;
	gchar *address, *tmp;
	gboolean state;

	/* Only support hands-free profile for now */
	if (strncasecmp(object_path, "/hfp/org/bluez", 14))
		return;

	if (g_strcmp0(signal_name, "PropertyChanged"))
		return;

	g_variant_get(parameters, "(sv)", &key, &var);

	if (g_strcmp0(key, "Online"))
		return;

	state = g_variant_get_boolean(var);

	address = g_strdup(strstr(object_path, "dev_") + 4);
	tmp = address;

	for (; *tmp; tmp++) {
		if (*tmp == '_') *tmp = ':';
	}

	if (state) {
		ofono_manager_set_default_modem((const char *) address);

		if (ofono_manager_get_default_modem_valid()) {
			ofono_init_default_modem();
		}
	} else if (!g_strcmp0(ofono_manager_get_default_modem_address(), address)) {
		AFB_NOTICE("Removing modem: (%s)", address);
		ofono_manager_invalidate_default_modem();
	}

	g_free(address);
}

static void ofono_event_init(void)
{
	GError *error = NULL;
	GDBusConnection *conn = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);

	g_dbus_connection_signal_subscribe(conn,
			NULL,	/* sender */
			OFONO_MODEM_INTERFACE,
			NULL,	/* member */
			NULL,	/* object path */
			NULL,	/* arg0 */
			G_DBUS_SIGNAL_FLAGS_NONE,
			ofono_modem_signal_callback,
			NULL,   /* user ptr */
			NULL);
}


static void ofono_hfp_init(void)
{
	ofono_manager_set_default_modem(NULL);

	if (ofono_manager_get_default_modem_valid()) {
		ofono_init_default_modem();
	}
}

static int ofono_init(afb_api_t api)
{
	pthread_t tid;
	int ret = 0;

	call_state_changed_event = afb_daemon_make_event("callStateChanged");
	dialing_call_event = afb_daemon_make_event("dialingCall");
	incoming_call_event = afb_daemon_make_event("incomingCall");
	terminated_call_event = afb_daemon_make_event("terminatedCall");

	/* Start the main loop thread */
	pthread_create(&tid, NULL, main_loop_thread, NULL);

	ret = ofono_manager_init();
	if (ret == 0) {
		ofono_event_init();
		ofono_hfp_init();
	} else {
		AFB_ERROR("failed to initialize ofono manager");
	}

	return ret;
}

static const afb_verb_t verbs[]= {
	{
		.verb		= "dial",
		.callback	= dial,
	},
	{
		.verb		= "hangup",
		.callback	= hangup,
	},
	{
		.verb		= "answer",
		.callback	= answer,
	},
	{
		.verb		= "subscribe",
		.callback	= subscribe,
	},
	{
		.verb		= "unsubscribe",
		.callback	= unsubscribe,
	},
	{ }
};

static int init(afb_api_t api)
{
	AFB_NOTICE("Initializing telephony service");

	return ofono_init(api);
}

const afb_binding_t afbBindingV3 = {
	.api = "telephony",
	.verbs = verbs,
	.init = init,
};