/*
 * Copyright (c) 2016 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(net_ieee802154_fake_driver, LOG_LEVEL_DBG);

#include <zephyr/kernel.h>

#include <zephyr/net/net_core.h>
#include "net_private.h"

#include <zephyr/net/net_pkt.h>

/** FAKE ieee802.15.4 driver **/
#include <zephyr/net/ieee802154_radio.h>

struct net_pkt *current_pkt;
K_SEM_DEFINE(driver_lock, 0, UINT_MAX);

static enum ieee802154_hw_caps fake_get_capabilities(const struct device *dev)
{
	return IEEE802154_HW_FCS | IEEE802154_HW_2_4_GHZ;
}

static int fake_cca(const struct device *dev)
{
	return 0;
}

static int fake_set_channel(const struct device *dev, uint16_t channel)
{
	NET_INFO("Channel %u\n", channel);

	return 0;
}

static int fake_set_txpower(const struct device *dev, int16_t dbm)
{
	NET_INFO("TX power %d dbm\n", dbm);

	return 0;
}

static inline void insert_frag(struct net_pkt *pkt, struct net_buf *frag)
{
	struct net_buf *new_frag;

	new_frag = net_pkt_get_frag(pkt, frag->len, K_SECONDS(1));
	if (!new_frag) {
		return;
	}

	memcpy(new_frag->data, frag->data, frag->len);
	net_buf_add(new_frag, frag->len);

	net_pkt_frag_add(current_pkt, new_frag);
}

static int fake_tx(const struct device *dev,
		   enum ieee802154_tx_mode mode,
		   struct net_pkt *pkt,
		   struct net_buf *frag)
{
	NET_INFO("Sending packet %p - length %zu\n",
		 pkt, net_pkt_get_len(pkt));

	if (!current_pkt) {
		return 0;
	}

	insert_frag(pkt, frag);

	k_sem_give(&driver_lock);

	return 0;
}

static int fake_start(const struct device *dev)
{
	NET_INFO("FAKE ieee802154 driver started\n");

	return 0;
}

static int fake_stop(const struct device *dev)
{
	NET_INFO("FAKE ieee802154 driver stopped\n");

	return 0;
}

static void fake_iface_init(struct net_if *iface)
{
	struct ieee802154_context *ctx = net_if_l2_data(iface);
	static uint8_t mac[8] = { 0x00, 0x12, 0x4b, 0x00,
				  0x00, 0x9e, 0xa3, 0xc2 };

	net_if_set_link_addr(iface, mac, 8, NET_LINK_IEEE802154);

	ieee802154_init(iface);

	ctx->pan_id = 0xabcd;
	ctx->channel = 26U;
	ctx->sequence = 62U;

	NET_INFO("FAKE ieee802154 iface initialized\n");
}

static int fake_init(const struct device *dev)
{
	fake_stop(dev);

	return 0;
}

static struct ieee802154_radio_api fake_radio_api = {
	.iface_api.init	= fake_iface_init,

	.get_capabilities	= fake_get_capabilities,
	.cca			= fake_cca,
	.set_channel		= fake_set_channel,
	.set_txpower		= fake_set_txpower,
	.start			= fake_start,
	.stop			= fake_stop,
	.tx			= fake_tx,
};

NET_DEVICE_INIT(fake, "fake_ieee802154",
		fake_init, NULL, NULL, NULL,
		CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
		&fake_radio_api, IEEE802154_L2,
		NET_L2_GET_CTX_TYPE(IEEE802154_L2), IEEE802154_MTU);