/*
 * Copyright (c) 2017 Nordic Semiconductor ASA
 * Copyright (c) 2015 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/bluetooth/buf.h>
#include <zephyr/bluetooth/l2cap.h>

#include "hci_core.h"
#include "conn_internal.h"
#include "iso_internal.h"

#include <zephyr/bluetooth/hci.h>

#if defined(CONFIG_BT_CONN)
#if defined(CONFIG_BT_ISO)
#define MAX_EVENT_COUNT CONFIG_BT_MAX_CONN + CONFIG_BT_ISO_MAX_CHAN
#else
#define MAX_EVENT_COUNT CONFIG_BT_MAX_CONN
#endif /* CONFIG_BT_ISO */
#elif defined(CONFIG_BT_ISO)
#define MAX_EVENT_COUNT CONFIG_BT_ISO_MAX_CHAN
#endif /* CONFIG_BT_CONN */

#if defined(CONFIG_BT_CONN) || defined(CONFIG_BT_ISO)
#define NUM_COMLETE_EVENT_SIZE BT_BUF_EVT_SIZE(                        \
	sizeof(struct bt_hci_cp_host_num_completed_packets) +          \
	MAX_EVENT_COUNT * sizeof(struct bt_hci_handle_count))

/* Pool for RX HCI buffers that are always freed by `bt_recv`
 * before it returns.
 *
 * A singleton buffer shall be sufficient for correct operation.
 * The buffer count may be increased as an optimization to allow
 * the HCI transport to fill buffers in parallel with `bt_recv`
 * consuming them.
 */
#define SYNC_EVT_SIZE NUM_COMLETE_EVENT_SIZE
NET_BUF_POOL_FIXED_DEFINE(sync_evt_pool, 1, SYNC_EVT_SIZE, sizeof(struct bt_buf_data), NULL);
#endif /* CONFIG_BT_CONN || CONFIG_BT_ISO */

NET_BUF_POOL_FIXED_DEFINE(discardable_pool, CONFIG_BT_BUF_EVT_DISCARDABLE_COUNT,
			  BT_BUF_EVT_SIZE(CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE),
			  sizeof(struct bt_buf_data), NULL);

#if defined(CONFIG_BT_HCI_ACL_FLOW_CONTROL)
NET_BUF_POOL_DEFINE(acl_in_pool, CONFIG_BT_BUF_ACL_RX_COUNT,
		    BT_BUF_ACL_SIZE(CONFIG_BT_BUF_ACL_RX_SIZE),
		    sizeof(struct acl_data), bt_hci_host_num_completed_packets);

NET_BUF_POOL_FIXED_DEFINE(evt_pool, CONFIG_BT_BUF_EVT_RX_COUNT,
			  BT_BUF_EVT_RX_SIZE, sizeof(struct bt_buf_data),
			  NULL);
#else
NET_BUF_POOL_FIXED_DEFINE(hci_rx_pool, BT_BUF_RX_COUNT,
			  BT_BUF_RX_SIZE, sizeof(struct bt_buf_data),
			  NULL);
#endif /* CONFIG_BT_HCI_ACL_FLOW_CONTROL */

struct net_buf *bt_buf_get_rx(enum bt_buf_type type, k_timeout_t timeout)
{
	struct net_buf *buf;

	__ASSERT(type == BT_BUF_EVT || type == BT_BUF_ACL_IN ||
		 type == BT_BUF_ISO_IN, "Invalid buffer type requested");

	if (IS_ENABLED(CONFIG_BT_ISO_RX) && type == BT_BUF_ISO_IN) {
		return bt_iso_get_rx(timeout);
	}

#if defined(CONFIG_BT_HCI_ACL_FLOW_CONTROL)
	if (type == BT_BUF_EVT) {
		buf = net_buf_alloc(&evt_pool, timeout);
	} else {
		buf = net_buf_alloc(&acl_in_pool, timeout);
	}
#else
	buf = net_buf_alloc(&hci_rx_pool, timeout);
#endif

	if (buf) {
		net_buf_reserve(buf, BT_BUF_RESERVE);
		bt_buf_set_type(buf, type);
	}

	return buf;
}

struct net_buf *bt_buf_get_evt(uint8_t evt, bool discardable,
			       k_timeout_t timeout)
{
	struct net_buf *buf;

	switch (evt) {
#if defined(CONFIG_BT_CONN) || defined(CONFIG_BT_ISO)
	case BT_HCI_EVT_NUM_COMPLETED_PACKETS:
		buf = net_buf_alloc(&sync_evt_pool, timeout);
		break;
#endif /* CONFIG_BT_CONN || CONFIG_BT_ISO */
	default:
		if (discardable) {
			buf = net_buf_alloc(&discardable_pool, timeout);
		} else {
			return bt_buf_get_rx(BT_BUF_EVT, timeout);
		}
	}

	if (buf) {
		net_buf_reserve(buf, BT_BUF_RESERVE);
		bt_buf_set_type(buf, BT_BUF_EVT);
	}

	return buf;
}

#ifdef ZTEST_UNITTEST
#if defined(CONFIG_BT_HCI_ACL_FLOW_CONTROL)
struct net_buf_pool *bt_buf_get_evt_pool(void)
{
	return &evt_pool;
}

struct net_buf_pool *bt_buf_get_acl_in_pool(void)
{
	return &acl_in_pool;
}
#else
struct net_buf_pool *bt_buf_get_hci_rx_pool(void)
{
	return &hci_rx_pool;
}
#endif /* CONFIG_BT_HCI_ACL_FLOW_CONTROL */

#if defined(CONFIG_BT_BUF_EVT_DISCARDABLE_COUNT)
struct net_buf_pool *bt_buf_get_discardable_pool(void)
{
	return &discardable_pool;
}
#endif /* CONFIG_BT_BUF_EVT_DISCARDABLE_COUNT */

#if defined(CONFIG_BT_CONN) || defined(CONFIG_BT_ISO)
struct net_buf_pool *bt_buf_get_num_complete_pool(void)
{
	return &sync_evt_pool;
}
#endif /* CONFIG_BT_CONN || CONFIG_BT_ISO */
#endif /* ZTEST_UNITTEST */