/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2010, Digium, Inc.
 *
 * David Vossel <dvossel@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file
 * \brief Device State Test Module
 *
 * \author David Vossel <dvossel@digium.com>
 *
 * \ingroup tests
 */

/*** MODULEINFO
	<depend>TEST_FRAMEWORK</depend>
	<support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/utils.h"
#include "asterisk/module.h"
#include "asterisk/test.h"
#include "asterisk/devicestate.h"
#include "asterisk/pbx.h"
#include "asterisk/stasis_message_router.h"
#include "asterisk/vector.h"

#define UNIT_TEST_DEVICE_IDENTIFIER "unit_test_device_identifier"

#define DEVICE_STATE_CHANNEL_TYPE "TestDeviceState"

#define DEVSTATE_PROVIDER "TestDevState"

#define DEVSTATE_PROVIDER_LC "testdevstate"

#define DEVSTATE_PROVIDER_LEN 12

/*! \brief Used to assign an increasing integer to channel name */
static unsigned int chan_idx;

/* These arrays are the result of the 'core show device2extenstate' output. */
static int combined_results[] = {
	AST_DEVICE_UNKNOWN,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_UNKNOWN,
	AST_DEVICE_UNAVAILABLE,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_BUSY,
	AST_DEVICE_BUSY,
	AST_DEVICE_BUSY,
	AST_DEVICE_BUSY,
	AST_DEVICE_BUSY,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_UNKNOWN,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_INVALID,
	AST_DEVICE_UNAVAILABLE,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_UNAVAILABLE,
	AST_DEVICE_NOT_INUSE,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_UNAVAILABLE,
	AST_DEVICE_UNAVAILABLE,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGING,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_INUSE,
	AST_DEVICE_BUSY,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_ONHOLD,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_RINGINUSE,
	AST_DEVICE_ONHOLD,
};

static int exten_results[] = {
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_UNAVAILABLE,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_UNAVAILABLE,
	AST_EXTENSION_UNAVAILABLE,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_UNAVAILABLE,
	AST_EXTENSION_NOT_INUSE,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_UNAVAILABLE,
	AST_EXTENSION_UNAVAILABLE,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_INUSE,
	AST_EXTENSION_BUSY,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_ONHOLD,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_INUSE | AST_EXTENSION_RINGING,
	AST_EXTENSION_ONHOLD,
};

/*! \brief Mutex for \c update_cond */
AST_MUTEX_DEFINE_STATIC(update_lock);

/*! \brief Condition wait variable for device state updates */
static ast_cond_t update_cond;

/*! \brief Mutext for \c channel_cb_cond */
AST_MUTEX_DEFINE_STATIC(channel_cb_lock);

/*! \brief Condition wait variable for channel tech device state cb */
static ast_cond_t channel_cb_cond;

/*! \brief The resulting device state updates caused by some function call */
static AST_VECTOR(, enum ast_device_state) result_states;

/*! \brief The current device state for our device state provider */
static enum ast_device_state current_device_state;

/*! \brief Clear out all recorded device states in \p result_states */
static void clear_result_states(void)
{
	ast_mutex_lock(&update_lock);
	while (AST_VECTOR_SIZE(&result_states) > 0) {
		AST_VECTOR_REMOVE_UNORDERED(&result_states, 0);
	}
	ast_mutex_unlock(&update_lock);
}

/*! \brief Stasis subscription callback for device state updates */
static void device_state_cb(void *data, struct stasis_subscription *sub, struct stasis_message *message)
{
	struct ast_device_state_message *payload;
	enum ast_device_state state;
	const char *device;

	if (stasis_message_type(message) != ast_device_state_message_type()) {
		return;
	}

	payload = stasis_message_data(message);
	state = payload->state;
	device = payload->device;

	if (ast_strlen_zero(device)) {
		return;
	}

	/* Ignore aggregate events */
	if (!payload->eid) {
		return;
	}

	if (strncasecmp(device, DEVSTATE_PROVIDER, DEVSTATE_PROVIDER_LEN)) {
		return;
	}

	ast_mutex_lock(&update_lock);
	AST_VECTOR_APPEND(&result_states, state);
	ast_cond_signal(&update_cond);
	ast_mutex_unlock(&update_lock);
}

static enum ast_device_state devstate_prov_cb(const char *data)
{
	return current_device_state;
}

static int wait_for_device_state_updates(struct ast_test *test, int expected_updates)
{
	int error;
	struct timeval wait_now = ast_tvnow();
	struct timespec wait_time = { .tv_sec = wait_now.tv_sec + 1, .tv_nsec = wait_now.tv_usec * 1000 };

	ast_mutex_lock(&update_lock);
	while (AST_VECTOR_SIZE(&result_states) != expected_updates) {
		error = ast_cond_timedwait(&update_cond, &update_lock, &wait_time);
		if (error == ETIMEDOUT) {
			ast_test_status_update(test, "Test timed out while waiting for %d expected updates\n", expected_updates);
			break;
		}
	}
	ast_mutex_unlock(&update_lock);

	ast_test_status_update(test, "Received %zu of %d updates\n", AST_VECTOR_SIZE(&result_states), expected_updates);
	return !(AST_VECTOR_SIZE(&result_states) == expected_updates);
}

AST_TEST_DEFINE(device2extenstate_test)
{
	int res = AST_TEST_PASS;
	struct ast_devstate_aggregate agg;
	enum ast_device_state i, j, combined;
	enum ast_extension_states exten;
	int k = 0;

	switch (cmd) {
	case TEST_INIT:
		info->name = "device2extenstate_test";
		info->category = "/main/devicestate/";
		info->summary = "Tests combined devstate mapping and device to extension state mapping.";
		info->description =
			"Verifies device state aggregate results match the expected combined "
			"devstate.  Then verifies the combined devstate maps to the expected "
			"extension state.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	if (ARRAY_LEN(exten_results) != (AST_DEVICE_TOTAL * AST_DEVICE_TOTAL)) {
		ast_test_status_update(test, "Result array is %d long when it should be %d. "
			"Something has changed, this test must be updated.\n",
			(int) ARRAY_LEN(exten_results), (AST_DEVICE_TOTAL * AST_DEVICE_TOTAL));
		return AST_TEST_FAIL;
	}

	if (ARRAY_LEN(combined_results) != ARRAY_LEN(exten_results)) {
		ast_test_status_update(test, "combined_results and exten_results arrays do not match in length.\n");
		return AST_TEST_FAIL;
	}

	for (i = 0; i < AST_DEVICE_TOTAL; i++) {
		for (j = 0; j < AST_DEVICE_TOTAL; j++) {
			ast_devstate_aggregate_init(&agg);
			ast_devstate_aggregate_add(&agg, i);
			ast_devstate_aggregate_add(&agg, j);
			combined = ast_devstate_aggregate_result(&agg);
			if (combined_results[k] != combined) {
				ast_test_status_update(test, "Expected combined dev state %s "
					"does not match %s at combined_result[%d].\n",
					ast_devstate2str(combined_results[k]),
					ast_devstate2str(combined), k);
				res = AST_TEST_FAIL;
			}

			exten = ast_devstate_to_extenstate(combined);

			if (exten_results[k] != exten) {
				ast_test_status_update(test, "Expected exten state %s "
					"does not match %s at exten_result[%d]\n",
					ast_extension_state2str(exten_results[k]),
					ast_extension_state2str(exten), k);
				res = AST_TEST_FAIL;
			}
			k++;
		}
	}

	return res;
}

struct consumer {
	ast_cond_t out;
	int already_out;
	int sig_on_non_aggregate_state;
	int event_count;
	enum ast_device_state state;
	enum ast_device_state aggregate_state;
};

static void consumer_dtor(void *obj)
{
	struct consumer *consumer = obj;

	ast_cond_destroy(&consumer->out);
}

static void consumer_reset(struct consumer *consumer)
{
	consumer->already_out = 0;
	consumer->event_count = 0;
	consumer->state = AST_DEVICE_TOTAL;
	consumer->aggregate_state = AST_DEVICE_TOTAL;
}

static struct consumer *consumer_create(void)
{
	struct consumer *consumer;

	consumer = ao2_alloc(sizeof(*consumer), consumer_dtor);
	if (!consumer) {
		return NULL;
	}

	ast_cond_init(&consumer->out, NULL);
	consumer_reset(consumer);

	return consumer;
}

static void consumer_exec(void *data, struct stasis_subscription *sub, struct stasis_message *message)
{
	struct consumer *consumer = data;
	struct stasis_cache_update *cache_update = stasis_message_data(message);
	struct ast_device_state_message *device_state;

	if (!cache_update->new_snapshot) {
		return;
	}

	device_state = stasis_message_data(cache_update->new_snapshot);

	if (strcmp(device_state->device, UNIT_TEST_DEVICE_IDENTIFIER)) {
		/* not a device state we're interested in */
		return;
	}

	{
		SCOPED_AO2LOCK(lock, consumer);

		++consumer->event_count;
		if (device_state->eid) {
			consumer->state = device_state->state;
			if (consumer->sig_on_non_aggregate_state) {
				consumer->sig_on_non_aggregate_state = 0;
				consumer->already_out = 1;
				ast_cond_signal(&consumer->out);
			}
		} else {
			consumer->aggregate_state = device_state->state;
			consumer->already_out = 1;
			ast_cond_signal(&consumer->out);
		}
	}
}

static void consumer_finalize(void *data, struct stasis_subscription *sub, struct stasis_message *message)
{
	struct consumer *consumer = data;

	if (stasis_subscription_final_message(sub, message)) {
		ao2_cleanup(consumer);
	}
}

static void consumer_wait_for(struct consumer *consumer)
{
	int res;
	struct timeval start = ast_tvnow();
	struct timespec end = {
		.tv_sec = start.tv_sec + 10,
		.tv_nsec = start.tv_usec * 1000
	};

	SCOPED_AO2LOCK(lock, consumer);

	while (!consumer->already_out) {
		res = ast_cond_timedwait(&consumer->out, ao2_object_get_lockaddr(consumer), &end);
		if (!res || res == ETIMEDOUT) {
			break;
		}
	}
}

static int remove_device_states_cb(void *obj, void *arg, int flags)
{
	struct stasis_message *msg = obj;
	struct ast_device_state_message *device_state = stasis_message_data(msg);

	if (strcmp(UNIT_TEST_DEVICE_IDENTIFIER, device_state->device)) {
		/* Not a unit test device */
		return 0;
	}

	msg = stasis_cache_clear_create(msg);
	if (msg) {
		/* topic guaranteed to have been created by this point */
		stasis_publish(ast_device_state_topic(device_state->device), msg);
	}
	ao2_cleanup(msg);
	return 0;
}

static void cache_cleanup(int unused)
{
	struct ao2_container *cache_dump;

	/* remove all device states created during this test */
	cache_dump = stasis_cache_dump_all(ast_device_state_cache(), NULL);
	if (!cache_dump) {
		return;
	}
	ao2_callback(cache_dump, 0, remove_device_states_cb, NULL);
	ao2_cleanup(cache_dump);
}

AST_TEST_DEFINE(device_state_aggregation_test)
{
	RAII_VAR(struct consumer *, consumer, NULL, ao2_cleanup);
	RAII_VAR(struct stasis_message_router *, device_msg_router, NULL, stasis_message_router_unsubscribe);
	RAII_VAR(struct ast_eid *, foreign_eid, NULL, ast_free);
	RAII_VAR(int, cleanup_cache, 0, cache_cleanup);
	RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
	int res;
	struct ast_device_state_message *device_state;

	switch (cmd) {
	case TEST_INIT:
		info->name = "device_state_aggregation_test";
		info->category = "/main/devicestate/";
		info->summary = "Tests message routing and aggregation through the Stasis device state system.";
		info->description =
			"Verifies that the device state system passes "
			"messages appropriately, that the aggregator is "
			"working properly, that the aggregate results match "
			"the expected combined devstate, and that the cached "
			"aggregate devstate is correct.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	foreign_eid = ast_malloc(sizeof(*foreign_eid));
	ast_test_validate(test, NULL != foreign_eid);
	memset(foreign_eid, 0xFF, sizeof(*foreign_eid));

	consumer = consumer_create();
	ast_test_validate(test, NULL != consumer);

	device_msg_router = stasis_message_router_create(ast_device_state_topic_cached());
	ast_test_validate(test, NULL != device_msg_router);

	ao2_ref(consumer, +1);
	res = stasis_message_router_add(device_msg_router, stasis_cache_update_type(), consumer_exec, consumer);
	ast_test_validate(test, !res);

	res = stasis_message_router_add(device_msg_router, stasis_subscription_change_type(), consumer_finalize, consumer);
	ast_test_validate(test, !res);

	/* push local state */
	ast_publish_device_state(UNIT_TEST_DEVICE_IDENTIFIER, AST_DEVICE_NOT_INUSE, AST_DEVSTATE_CACHABLE);

	/* Check cache aggregate state immediately */
	ao2_cleanup(msg);
	msg = stasis_cache_get_by_eid(ast_device_state_cache(), ast_device_state_message_type(), UNIT_TEST_DEVICE_IDENTIFIER, NULL);
	device_state = stasis_message_data(msg);
	ast_test_validate(test, AST_DEVICE_NOT_INUSE == device_state->state);

	consumer_wait_for(consumer);
	ast_test_validate(test, AST_DEVICE_NOT_INUSE == consumer->state);
	ast_test_validate(test, AST_DEVICE_NOT_INUSE == consumer->aggregate_state);
	ast_test_validate(test, 2 == consumer->event_count);
	consumer_reset(consumer);

	/* push remote state */
	/* this will not produce a new aggregate state message since the aggregate state does not change */
	consumer->sig_on_non_aggregate_state = 1;
	ast_publish_device_state_full(UNIT_TEST_DEVICE_IDENTIFIER, AST_DEVICE_NOT_INUSE, AST_DEVSTATE_CACHABLE, foreign_eid);

	/* Check cache aggregate state immediately */
	ao2_cleanup(msg);
	msg = stasis_cache_get_by_eid(ast_device_state_cache(), ast_device_state_message_type(), UNIT_TEST_DEVICE_IDENTIFIER, NULL);
	device_state = stasis_message_data(msg);
	ast_test_validate(test, AST_DEVICE_NOT_INUSE == device_state->state);

	/* Check for expected events. */
	consumer_wait_for(consumer);
	ast_test_validate(test, AST_DEVICE_NOT_INUSE == consumer->state);
	ast_test_validate(test, AST_DEVICE_TOTAL == consumer->aggregate_state);
	ast_test_validate(test, 1 == consumer->event_count);
	consumer_reset(consumer);

	/* push remote state different from local state */
	ast_publish_device_state_full(UNIT_TEST_DEVICE_IDENTIFIER, AST_DEVICE_INUSE, AST_DEVSTATE_CACHABLE, foreign_eid);

	/* Check cache aggregate state immediately */
	ao2_cleanup(msg);
	msg = stasis_cache_get_by_eid(ast_device_state_cache(), ast_device_state_message_type(), UNIT_TEST_DEVICE_IDENTIFIER, NULL);
	device_state = stasis_message_data(msg);
	ast_test_validate(test, AST_DEVICE_INUSE == device_state->state);

	/* Check for expected events. */
	consumer_wait_for(consumer);
	ast_test_validate(test, AST_DEVICE_INUSE == consumer->state);
	ast_test_validate(test, AST_DEVICE_INUSE == consumer->aggregate_state);
	ast_test_validate(test, 2 == consumer->event_count);
	consumer_reset(consumer);

	/* push local state that will cause aggregated state different from local non-aggregate state */
	ast_publish_device_state(UNIT_TEST_DEVICE_IDENTIFIER, AST_DEVICE_RINGING, AST_DEVSTATE_CACHABLE);

	/* Check cache aggregate state immediately */
	ao2_cleanup(msg);
	msg = stasis_cache_get_by_eid(ast_device_state_cache(), ast_device_state_message_type(), UNIT_TEST_DEVICE_IDENTIFIER, NULL);
	device_state = stasis_message_data(msg);
	ast_test_validate(test, AST_DEVICE_RINGINUSE == device_state->state);

	/* Check for expected events. */
	consumer_wait_for(consumer);
	ast_test_validate(test, AST_DEVICE_RINGING == consumer->state);
	ast_test_validate(test, AST_DEVICE_RINGINUSE == consumer->aggregate_state);
	ast_test_validate(test, 2 == consumer->event_count);
	consumer_reset(consumer);

	return AST_TEST_PASS;
}

AST_TEST_DEFINE(devstate_prov_add)
{
	switch (cmd) {
	case TEST_INIT:
		info->name = __func__;
		info->category = "/main/devicestate/";
		info->summary = "Test adding a device state provider";
		info->description =
			"Test that a custom device state provider can be added, and that\n"
			"it cannot be added if already added.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	ast_test_validate(test, ast_devstate_prov_add(DEVSTATE_PROVIDER, devstate_prov_cb) == 0);
	ast_test_validate(test, ast_devstate_prov_add(DEVSTATE_PROVIDER, devstate_prov_cb) != 0);
	ast_test_validate(test, ast_devstate_prov_del(DEVSTATE_PROVIDER) == 0);

	return AST_TEST_PASS;
}

AST_TEST_DEFINE(devstate_prov_del)
{
	switch (cmd) {
	case TEST_INIT:
		info->name = __func__;
		info->category = "/main/devicestate/";
		info->summary = "Test removing a device state provider";
		info->description =
			"Test that a custom device state provider can be removed, and that\n"
			"it cannot be removed if already removed.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	ast_test_validate(test, ast_devstate_prov_add(DEVSTATE_PROVIDER, devstate_prov_cb) == 0);
	ast_test_validate(test, ast_devstate_prov_del(DEVSTATE_PROVIDER) == 0);
	ast_test_validate(test, ast_devstate_prov_del(DEVSTATE_PROVIDER) != 0);

	return AST_TEST_PASS;
}

AST_TEST_DEFINE(devstate_changed)
{
	RAII_VAR(struct stasis_subscription *, sub, NULL, ao2_cleanup);
	int i;
	enum ast_device_state expected_results[] = {
		AST_DEVICE_NOT_INUSE,
		AST_DEVICE_INUSE,
		AST_DEVICE_BUSY,
		AST_DEVICE_INVALID,
		AST_DEVICE_UNAVAILABLE,
		AST_DEVICE_RINGING,
		AST_DEVICE_RINGINUSE,
		AST_DEVICE_ONHOLD,
	};

	switch (cmd) {
	case TEST_INIT:
		info->name = __func__;
		info->category = "/main/devicestate/";
		info->summary = "Test updates coming from a device state provider";
		info->description =
			"This unit test checks that a custom device state provider can\n"
			"have updates published for it. This includes both cacheable and\n"
			"non-cacheable events. In the case of non-cacheable events, the\n"
			"device state provider's callback function is queried for the\n"
			"device state when AST_DEVICE_UNKNOWN is published.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	ast_test_validate(test, (sub = stasis_subscribe(ast_device_state_topic_all(), device_state_cb, NULL)) != NULL);

	clear_result_states();
	current_device_state = AST_DEVICE_BUSY;

	ast_test_validate(test, ast_devstate_prov_add(DEVSTATE_PROVIDER, devstate_prov_cb) == 0);

	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_NOT_INUSE, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_INUSE, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_BUSY, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_INVALID, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_UNAVAILABLE, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_RINGING, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_RINGINUSE, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_ONHOLD, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);

	ast_test_validate(test, wait_for_device_state_updates(test, 8) == 0);

	for (i = 0; i < AST_VECTOR_SIZE(&result_states); i++) {
		ast_test_status_update(test, "Testing update %d: actual is %d; expected is %d\n",
			i,
			AST_VECTOR_GET(&result_states, i),
			expected_results[i]);
		ast_test_validate(test, AST_VECTOR_GET(&result_states, i) == expected_results[i]);
	}

	sub = stasis_unsubscribe_and_join(sub);
	clear_result_states();

	/*
	 * Since an update of AST_DEVICE_UNKNOWN will cause a different thread to retrieve
	 * the update from the custom device state provider, check it separately from the
	 * updates above.
	 */
	ast_test_validate(test, (sub = stasis_subscribe(ast_device_state_topic_all(), device_state_cb, NULL)) != NULL);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, AST_DEVSTATE_NOT_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, wait_for_device_state_updates(test, 1) == 0);

	ast_test_validate(test, AST_VECTOR_GET(&result_states, 0) == AST_DEVICE_BUSY);
	ast_test_validate(test, ast_device_state(DEVSTATE_PROVIDER ":foo") == AST_DEVICE_BUSY);
	ast_test_validate(test, ast_device_state(DEVSTATE_PROVIDER_LC ":foo") == AST_DEVICE_BUSY);

	sub = stasis_unsubscribe_and_join(sub);
	clear_result_states();

	ast_test_validate(test, (sub = stasis_subscribe(ast_device_state_topic_all(), device_state_cb, NULL)) != NULL);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_NOT_INUSE, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_INUSE, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_BUSY, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_INVALID, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_UNAVAILABLE, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_RINGING, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_RINGINUSE, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);
	ast_test_validate(test, ast_devstate_changed_literal(AST_DEVICE_ONHOLD, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo") == 0);

	ast_test_validate(test, wait_for_device_state_updates(test, 8) == 0);
	for (i = 0; i < AST_VECTOR_SIZE(&result_states); i++) {
		ast_test_status_update(test, "Testing update %d: actual is %d; expected is %d\n",
			i,
			AST_VECTOR_GET(&result_states, i),
			expected_results[i]);
		ast_test_validate(test, AST_VECTOR_GET(&result_states, i) == expected_results[i]);
	}

	/*
	 * Check the last value in the cache. Note that this should not hit
	 * the value of current_device_state.
	 */
	ast_test_validate(test, ast_device_state(DEVSTATE_PROVIDER ":foo") == AST_DEVICE_ONHOLD);
	/*
	 * This will miss on the cache, as it is case sensitive. It should go
	 * hit our device state callback however.
	 */
	ast_test_validate(test, ast_device_state(DEVSTATE_PROVIDER_LC ":foo") == AST_DEVICE_BUSY);

	/* Generally, this test can't be run twice in a row, as you can't remove an
	 * item from the cache. Hence, subsequent runs won't hit the device state provider,
	 * and will merely return the cached value.
	 *
	 * To avoid annoying errors, set the last state to BUSY here.
	 */
	ast_devstate_changed_literal(AST_DEVICE_BUSY, AST_DEVSTATE_CACHABLE, DEVSTATE_PROVIDER ":foo");

	ast_test_validate(test, ast_devstate_prov_del(DEVSTATE_PROVIDER) == 0);

	sub = stasis_unsubscribe_and_join(sub);
	clear_result_states();

	return AST_TEST_PASS;
}

AST_TEST_DEFINE(devstate_conversions)
{
	switch (cmd) {
	case TEST_INIT:
		info->name = __func__;
		info->category = "/main/devicestate/";
		info->summary = "Test ast_device_state conversions";
		info->description =
			"Test various transformations of ast_device_state values.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_UNKNOWN), "UNKNOWN"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_NOT_INUSE), "NOT_INUSE"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_INUSE), "INUSE"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_BUSY), "BUSY"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_INVALID), "INVALID"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_UNAVAILABLE), "UNAVAILABLE"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_RINGING), "RINGING"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_RINGINUSE), "RINGINUSE"));
	ast_test_validate(test, !strcmp(ast_devstate_str(AST_DEVICE_ONHOLD), "ONHOLD"));

	ast_test_validate(test, ast_devstate_val("UNKNOWN") == AST_DEVICE_UNKNOWN);
	ast_test_validate(test, ast_devstate_val("NOT_INUSE") == AST_DEVICE_NOT_INUSE);
	ast_test_validate(test, ast_devstate_val("INUSE") == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_devstate_val("BUSY") == AST_DEVICE_BUSY);
	ast_test_validate(test, ast_devstate_val("INVALID") == AST_DEVICE_INVALID);
	ast_test_validate(test, ast_devstate_val("UNAVAILABLE") == AST_DEVICE_UNAVAILABLE);
	ast_test_validate(test, ast_devstate_val("RINGING") == AST_DEVICE_RINGING);
	ast_test_validate(test, ast_devstate_val("RINGINUSE") == AST_DEVICE_RINGINUSE);
	ast_test_validate(test, ast_devstate_val("ONHOLD") == AST_DEVICE_ONHOLD);
	ast_test_validate(test, ast_devstate_val("onhold") == AST_DEVICE_ONHOLD);
	ast_test_validate(test, ast_devstate_val("FOO") == AST_DEVICE_UNKNOWN);

	ast_test_validate(test, ast_state_chan2dev(AST_STATE_DOWN) == AST_DEVICE_NOT_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_RESERVED) == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_OFFHOOK) == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_DIALING) == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_RING) == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_RINGING) == AST_DEVICE_RINGING);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_UP) == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_BUSY) == AST_DEVICE_BUSY);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_DIALING_OFFHOOK) == AST_DEVICE_INUSE);
	ast_test_validate(test, ast_state_chan2dev(AST_STATE_PRERING) == AST_DEVICE_RINGING);

	return AST_TEST_PASS;
}

/*! \brief Whether or not the channel device state callback was called */
static int chan_callback_called;

/*! \brief Wait until the test channel driver's devicestate callback is called */
static int wait_for_channel_callback(struct ast_test *test)
{
	int error;
	struct timeval wait_now = ast_tvnow();
	struct timespec wait_time = { .tv_sec = wait_now.tv_sec + 1, .tv_nsec = wait_now.tv_usec * 1000 };

	ast_mutex_lock(&channel_cb_lock);
	while (!chan_callback_called) {
		error = ast_cond_timedwait(&channel_cb_cond, &channel_cb_lock, &wait_time);
		if (error == ETIMEDOUT) {
			ast_test_status_update(test, "Test timed out while waiting channel callback\n");
			break;
		}
	}
	ast_mutex_unlock(&channel_cb_lock);

	return chan_callback_called;
}

static void safe_hangup(void *object)
{
	struct ast_channel *chan = object;

	if (!chan) {
		return;
	}
	ast_hangup(chan);
}

AST_TEST_DEFINE(devstate_channels)
{
	RAII_VAR(struct ast_channel *, chan, NULL, safe_hangup);

	switch (cmd) {
	case TEST_INIT:
		info->name = __func__;
		info->category = "/main/devicestate/";
		info->summary = "Test deriving device state from a channel's state";
		info->description =
			"Test querying a channel's state to derive a device state.";
		return AST_TEST_NOT_RUN;
	case TEST_EXECUTE:
		break;
	}

	chan_callback_called = 0;

	chan = ast_channel_alloc(0, AST_STATE_RINGING, "", "", "", "s", "default",
		NULL, NULL, 0, DEVICE_STATE_CHANNEL_TYPE "/foo-%08x",
		(unsigned) ast_atomic_fetchadd_int((int *) &chan_idx, +1));
	ast_test_validate(test, chan != NULL);

	ast_test_validate(test, ast_parse_device_state(DEVICE_STATE_CHANNEL_TYPE "/foo") == AST_DEVICE_RINGING);
	ast_test_validate(test, ast_parse_device_state(DEVICE_STATE_CHANNEL_TYPE "/bad") == AST_DEVICE_UNKNOWN);

	ast_setstate(chan, AST_STATE_UP);

	ast_test_validate(test, wait_for_channel_callback(test) == 1);
	ast_test_validate(test, ast_parse_device_state(DEVICE_STATE_CHANNEL_TYPE "/foo") == AST_DEVICE_INUSE);

	chan_callback_called = 0;

	return AST_TEST_PASS;
}

static int chan_test_devicestate_cb(const char *device_number)
{
	/* Simply record that we were called when expected */
	chan_callback_called = 1;

	ast_mutex_lock(&channel_cb_lock);
	ast_cond_signal(&channel_cb_cond);
	ast_mutex_unlock(&channel_cb_lock);

	return AST_DEVICE_INUSE;
}

struct ast_channel_tech chan_test_devicestate = {
	.type = DEVICE_STATE_CHANNEL_TYPE,
	.description = "Device State Unit Test Channel Driver",
	.devicestate = chan_test_devicestate_cb,
};

static int unload_module(void)
{
	AST_VECTOR_FREE(&result_states);
	ast_channel_unregister(&chan_test_devicestate);

	AST_TEST_UNREGISTER(device2extenstate_test);
	AST_TEST_UNREGISTER(device_state_aggregation_test);

	AST_TEST_UNREGISTER(devstate_prov_add);
	AST_TEST_UNREGISTER(devstate_prov_del);

	AST_TEST_UNREGISTER(devstate_changed);
	AST_TEST_UNREGISTER(devstate_conversions);

	AST_TEST_UNREGISTER(devstate_channels);

	return 0;
}

static int load_module(void)
{
	if (AST_VECTOR_INIT(&result_states, 8) == -1) {
		return AST_MODULE_LOAD_DECLINE;
	}

	if (ast_channel_register(&chan_test_devicestate)) {
		AST_VECTOR_FREE(&result_states);
		return AST_MODULE_LOAD_DECLINE;
	}

	AST_TEST_REGISTER(device_state_aggregation_test);
	AST_TEST_REGISTER(device2extenstate_test);

	AST_TEST_REGISTER(devstate_prov_add);
	AST_TEST_REGISTER(devstate_prov_del);

	AST_TEST_REGISTER(devstate_changed);
	AST_TEST_REGISTER(devstate_conversions);

	AST_TEST_REGISTER(devstate_channels);

	return AST_MODULE_LOAD_SUCCESS;
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Device State Test");
