/*
 * Copyright (c) 2021-2022 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#if defined(CONFIG_BT_AUDIO_UNICAST_SERVER)

#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/audio/audio.h>
#include <zephyr/bluetooth/audio/pacs.h>
#include "common.h"
#include "unicast_common.h"

extern enum bst_result_t bst_result;

#define CHANNEL_COUNT_1 BIT(0)

static struct bt_codec lc3_codec =
	BT_CODEC_LC3(BT_CODEC_LC3_FREQ_16KHZ, BT_CODEC_LC3_DURATION_10, CHANNEL_COUNT_1, 40u, 40u,
		     1u, (BT_AUDIO_CONTEXT_TYPE_CONVERSATIONAL | BT_AUDIO_CONTEXT_TYPE_MEDIA));

static struct bt_audio_stream streams[CONFIG_BT_ASCS_ASE_SNK_COUNT + CONFIG_BT_ASCS_ASE_SRC_COUNT];

static const struct bt_codec_qos_pref qos_pref = BT_CODEC_QOS_PREF(true, BT_GAP_LE_PHY_2M, 0x02,
								   10, 40000, 40000, 40000, 40000);

/* TODO: Expand with BAP data */
static const struct bt_data unicast_server_ad[] = {
	BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
	BT_DATA_BYTES(BT_DATA_UUID16_ALL, BT_UUID_16_ENCODE(BT_UUID_ASCS_VAL)),
};

CREATE_FLAG(flag_connected);
CREATE_FLAG(flag_stream_configured);

static struct bt_audio_stream *stream_alloc(void)
{
	for (size_t i = 0; i < ARRAY_SIZE(streams); i++) {
		struct bt_audio_stream *stream = &streams[i];

		if (!stream->conn) {
			return stream;
		}
	}

	return NULL;
}

static int lc3_config(struct bt_conn *conn, const struct bt_audio_ep *ep, enum bt_audio_dir dir,
		      const struct bt_codec *codec, struct bt_audio_stream **stream,
		      struct bt_codec_qos_pref *const pref)
{
	printk("ASE Codec Config: conn %p ep %p dir %u\n", conn, ep, dir);

	print_codec(codec);

	*stream = stream_alloc();
	if (*stream == NULL) {
		printk("No streams available\n");

		return -ENOMEM;
	}

	printk("ASE Codec Config stream %p\n", *stream);

	SET_FLAG(flag_stream_configured);

	*pref = qos_pref;

	return 0;
}

static int lc3_reconfig(struct bt_audio_stream *stream, enum bt_audio_dir dir,
			const struct bt_codec *codec, struct bt_codec_qos_pref *const pref)
{
	printk("ASE Codec Reconfig: stream %p\n", stream);

	print_codec(codec);

	/* We only support one QoS at the moment, reject changes */
	return -ENOEXEC;
}

static int lc3_qos(struct bt_audio_stream *stream, const struct bt_codec_qos *qos)
{
	printk("QoS: stream %p qos %p\n", stream, qos);

	print_qos(qos);

	return 0;
}

static int lc3_enable(struct bt_audio_stream *stream, const struct bt_codec_data *meta,
		      size_t meta_count)
{
	printk("Enable: stream %p meta_count %zu\n", stream, meta_count);

	return 0;
}

static int lc3_start(struct bt_audio_stream *stream)
{
	printk("Start: stream %p\n", stream);

	return 0;
}

static bool valid_metadata_type(uint8_t type, uint8_t len)
{
	switch (type) {
	case BT_AUDIO_METADATA_TYPE_PREF_CONTEXT:
	case BT_AUDIO_METADATA_TYPE_STREAM_CONTEXT:
		if (len != 2) {
			return false;
		}

		return true;
	case BT_AUDIO_METADATA_TYPE_STREAM_LANG:
		if (len != 3) {
			return false;
		}

		return true;
	case BT_AUDIO_METADATA_TYPE_PARENTAL_RATING:
		if (len != 1) {
			return false;
		}

		return true;
	case BT_AUDIO_METADATA_TYPE_EXTENDED: /* 1 - 255 octets */
	case BT_AUDIO_METADATA_TYPE_VENDOR: /* 1 - 255 octets */
		if (len < 1) {
			return false;
		}

		return true;
	case BT_AUDIO_METADATA_TYPE_CCID_LIST: /* 2 - 254 octets */
		if (len < 2) {
			return false;
		}

		return true;
	case BT_AUDIO_METADATA_TYPE_PROGRAM_INFO: /* 0 - 255 octets */
	case BT_AUDIO_METADATA_TYPE_PROGRAM_INFO_URI: /* 0 - 255 octets */
		return true;
	default:
		return false;
	}
}

static int lc3_metadata(struct bt_audio_stream *stream, const struct bt_codec_data *meta,
			size_t meta_count)
{
	printk("Metadata: stream %p meta_count %zu\n", stream, meta_count);

	for (size_t i = 0; i < meta_count; i++) {
		if (!valid_metadata_type(meta->data.type, meta->data.data_len)) {
			printk("Invalid metadata type %u or length %u\n",
			       meta->data.type, meta->data.data_len);

			return -EINVAL;
		}
	}

	return 0;
}

static int lc3_disable(struct bt_audio_stream *stream)
{
	printk("Disable: stream %p\n", stream);

	return 0;
}

static int lc3_stop(struct bt_audio_stream *stream)
{
	printk("Stop: stream %p\n", stream);

	return 0;
}

static int lc3_release(struct bt_audio_stream *stream)
{
	printk("Release: stream %p\n", stream);

	return 0;
}

static const struct bt_audio_unicast_server_cb unicast_server_cb = {
	.config = lc3_config,
	.reconfig = lc3_reconfig,
	.qos = lc3_qos,
	.enable = lc3_enable,
	.start = lc3_start,
	.metadata = lc3_metadata,
	.disable = lc3_disable,
	.stop = lc3_stop,
	.release = lc3_release,
};

static void stream_recv(struct bt_audio_stream *stream,
			const struct bt_iso_recv_info *info,
			struct net_buf *buf)
{
	printk("Incoming audio on stream %p len %u\n", stream, buf->len);
}

static struct bt_audio_stream_ops stream_ops = {
	.recv = stream_recv
};

static void connected(struct bt_conn *conn, uint8_t err)
{
	char addr[BT_ADDR_LE_STR_LEN];

	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));

	if (err != 0) {
		FAIL("Failed to connect to %s (%u)\n", addr, err);
		return;
	}

	printk("Connected to %s\n", addr);
	SET_FLAG(flag_connected);
}

BT_CONN_CB_DEFINE(conn_callbacks) = {
	.connected = connected,
	.disconnected = disconnected,
};

static void init(void)
{
	static struct bt_pacs_cap cap = {
		.codec = &lc3_codec,
	};
	int err;

	err = bt_enable(NULL);
	if (err != 0) {
		FAIL("Bluetooth enable failed (err %d)\n", err);
		return;
	}

	printk("Bluetooth initialized\n");

	bt_audio_unicast_server_register_cb(&unicast_server_cb);

	err = bt_pacs_cap_register(BT_AUDIO_DIR_SINK, &cap);
	if (err != 0) {
		FAIL("Failed to register capabilities: %d", err);
		return;
	}

	for (size_t i = 0; i < ARRAY_SIZE(streams); i++) {
		bt_audio_stream_cb_register(&streams[i], &stream_ops);
	}


	err = bt_le_adv_start(BT_LE_ADV_CONN_NAME, unicast_server_ad,
			      ARRAY_SIZE(unicast_server_ad), NULL, 0);
	if (err != 0) {
		FAIL("Advertising failed to start (err %d)\n", err);
		return;
	}
}

static void set_location(void)
{
	int err;

	if (IS_ENABLED(CONFIG_BT_PAC_SNK_LOC)) {
		err = bt_pacs_set_location(BT_AUDIO_DIR_SINK,
					   BT_AUDIO_LOCATION_FRONT_CENTER);
		if (err != 0) {
			FAIL("Failed to set sink location (err %d)\n", err);
			return;
		}
	}

	if (IS_ENABLED(CONFIG_BT_PAC_SRC_LOC)) {
		err = bt_pacs_set_location(BT_AUDIO_DIR_SOURCE,
					   (BT_AUDIO_LOCATION_FRONT_LEFT |
					    BT_AUDIO_LOCATION_FRONT_RIGHT));
		if (err != 0) {
			FAIL("Failed to set source location (err %d)\n", err);
			return;
		}
	}

	printk("Location successfully set\n");
}

static void set_available_contexts(void)
{
	int err;

	err = bt_pacs_set_supported_contexts(BT_AUDIO_DIR_SINK,
					     BT_AUDIO_CONTEXT_TYPE_MEDIA |
					     BT_AUDIO_CONTEXT_TYPE_CONVERSATIONAL);
	if (IS_ENABLED(CONFIG_BT_PAC_SNK) && err != 0) {
		FAIL("Failed to set sink supported contexts (err %d)\n", err);
		return;
	}

	err = bt_pacs_set_available_contexts(BT_AUDIO_DIR_SINK,
					     BT_AUDIO_CONTEXT_TYPE_MEDIA |
					     BT_AUDIO_CONTEXT_TYPE_CONVERSATIONAL);
	if (IS_ENABLED(CONFIG_BT_PAC_SNK) && err != 0) {
		FAIL("Failed to set sink available contexts (err %d)\n", err);
		return;
	}

	err = bt_pacs_set_supported_contexts(BT_AUDIO_DIR_SOURCE,
					     BT_AUDIO_CONTEXT_TYPE_NOTIFICATIONS);
	if (IS_ENABLED(CONFIG_BT_PAC_SRC) && err != 0) {
		FAIL("Failed to set source supported contexts (err %d)\n", err);
		return;
	}

	err = bt_pacs_set_available_contexts(BT_AUDIO_DIR_SOURCE,
					     BT_AUDIO_CONTEXT_TYPE_NOTIFICATIONS);
	if (IS_ENABLED(CONFIG_BT_PAC_SRC) && err != 0) {
		FAIL("Failed to set source available contexts (err %d)\n", err);
		return;
	}

	printk("Available contexts successfully set\n");
}

static void test_main(void)
{
	init();

	set_location();
	set_available_contexts();

	/* TODO: When babblesim supports ISO, wait for audio stream to pass */

	WAIT_FOR_FLAG(flag_connected);
	WAIT_FOR_FLAG(flag_stream_configured);
	PASS("Unicast server passed\n");
}

static const struct bst_test_instance test_unicast_server[] = {
	{
		.test_id = "unicast_server",
		.test_post_init_f = test_init,
		.test_tick_f = test_tick,
		.test_main_f = test_main
	},
	BSTEST_END_MARKER
};

struct bst_test_list *test_unicast_server_install(struct bst_test_list *tests)
{
	return bst_add_tests(tests, test_unicast_server);
}

#else /* !(CONFIG_BT_AUDIO_UNICAST_SERVER) */

struct bst_test_list *test_unicast_server_install(struct bst_test_list *tests)
{
	return tests;
}

#endif /* CONFIG_BT_AUDIO_UNICAST_SERVER */