/*
 * Copyright (c) 2017 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

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

#include <zephyr.h>
#include <linker/sections.h>
#include <errno.h>
#include <stdio.h>

#include <net/net_core.h>
#include <net/net_if.h>
#include <net/net_mgmt.h>

#if defined(CONFIG_NET_DHCPV4)
static struct net_mgmt_event_callback mgmt_cb;

static void ipv4_addr_add_handler(struct net_mgmt_event_callback *cb,
				  u32_t mgmt_event,
				  struct net_if *iface)
{
	char hr_addr[NET_IPV4_ADDR_LEN];
	int i = 0;

	if (mgmt_event != NET_EVENT_IPV4_ADDR_ADD) {
		/* Spurious callback. */
		return;
	}

	for (i = 0; i < NET_IF_MAX_IPV4_ADDR; i++) {
		struct net_if_addr *if_addr =
			&iface->config.ip.ipv4->unicast[i];

		if (if_addr->addr_type != NET_ADDR_DHCP || !if_addr->is_used) {
			continue;
		}

		LOG_INF("IPv4 address: %s",
			log_strdup(net_addr_ntop(AF_INET,
					       &if_addr->address.in_addr,
					       hr_addr, NET_IPV4_ADDR_LEN)));
		LOG_INF("Lease time: %u seconds",
			 iface->config.dhcpv4.lease_time);
		LOG_INF("Subnet: %s",
			log_strdup(net_addr_ntop(AF_INET,
					       &iface->config.ip.ipv4->netmask,
					       hr_addr, NET_IPV4_ADDR_LEN)));
		LOG_INF("Router: %s",
			log_strdup(net_addr_ntop(AF_INET,
						 &iface->config.ip.ipv4->gw,
						 hr_addr, NET_IPV4_ADDR_LEN)));
		break;
	}
}

static void setup_dhcpv4(struct net_if *iface)
{
	LOG_INF("Running dhcpv4 client...");

	net_mgmt_init_event_callback(&mgmt_cb, ipv4_addr_add_handler,
				     NET_EVENT_IPV4_ADDR_ADD);
	net_mgmt_add_event_callback(&mgmt_cb);

	net_dhcpv4_start(iface);
}

#else
#define setup_dhcpv4(...)
#endif /* CONFIG_NET_DHCPV4 */

#if defined(CONFIG_NET_IPV4) && !defined(CONFIG_NET_DHCPV4)

#if !defined(CONFIG_NET_CONFIG_MY_IPV4_ADDR)
#error "You need to define an IPv4 Address or enable DHCPv4!"
#endif

static void setup_ipv4(struct net_if *iface)
{
	char hr_addr[NET_IPV4_ADDR_LEN];
	struct in_addr addr;

	if (net_addr_pton(AF_INET, CONFIG_NET_CONFIG_MY_IPV4_ADDR, &addr)) {
		LOG_ERR("Invalid address: %s", CONFIG_NET_CONFIG_MY_IPV4_ADDR);
		return;
	}

	net_if_ipv4_addr_add(iface, &addr, NET_ADDR_MANUAL, 0);

	LOG_INF("IPv4 address: %s",
		log_strdup(net_addr_ntop(AF_INET, &addr, hr_addr,
					 NET_IPV4_ADDR_LEN)));
}

#else
#define setup_ipv4(...)
#endif /* CONFIG_NET_IPV4 && !CONFIG_NET_DHCPV4 */

#if defined(CONFIG_NET_IPV6)

#define MCAST_IP6ADDR "ff84::2"

#ifndef CONFIG_NET_CONFIG_MY_IPV6_ADDR
#error "You need to define an IPv6 Address!"
#endif

static void setup_ipv6(struct net_if *iface)
{
	char hr_addr[NET_IPV6_ADDR_LEN];
	struct in6_addr addr;

	if (net_addr_pton(AF_INET6, CONFIG_NET_CONFIG_MY_IPV6_ADDR, &addr)) {
		LOG_ERR("Invalid address: %s", CONFIG_NET_CONFIG_MY_IPV6_ADDR);
		return;
	}

	net_if_ipv6_addr_add(iface, &addr, NET_ADDR_MANUAL, 0);

	LOG_INF("IPv6 address: %s",
		log_strdup(net_addr_ntop(AF_INET6, &addr, hr_addr,
					 NET_IPV6_ADDR_LEN)));

	if (net_addr_pton(AF_INET6, MCAST_IP6ADDR, &addr)) {
		LOG_ERR("Invalid address: %s", MCAST_IP6ADDR);
		return;
	}

	net_if_ipv6_maddr_add(iface, &addr);
}

#else
#define setup_ipv6(...)
#endif /* CONFIG_NET_IPV6 */

void main(void)
{
	struct net_if *iface = net_if_get_default();

	LOG_INF("Starting Telnet sample");

	setup_ipv4(iface);

	setup_dhcpv4(iface);

	setup_ipv6(iface);
}