/**
 * \file
 *
 * \brief Ethernet management for the standalone lwIP example.
 *
 * Copyright (c) 2012 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */

#include "ethernet_sam.h"

#if defined(__SAME70Q20B__)
# include <Hardware/SAME70/Ethernet/GmacInterface.h>
#elif defined(__SAME54P20A__)
# include <Hardware/SAME5x/Ethernet/GmacInterface.h>
#else
# error Unsupported processor
#endif

#include "lwip/netif.h"

#include <cstring>

extern "C" {

/* lwIP includes */
#include "lwip/api.h"
#include "lwip/dhcp.h"
#include "lwip/dns.h"
#include "lwip/init.h"
#include "lwip/ip4_frag.h"
#include "lwip/memp.h"
#include "lwip/priv/tcp_priv.h"
#include "lwip/stats.h"
#include "lwip/sys.h"
#include "lwip/tcp.h"
#include "netif/etharp.h"

/* Global variable containing MAC Config (hw addr, IP, GW, ...) */
struct netif gs_net_if;

/* Timer for calling lwIP tmr functions without system */
typedef struct timers_info {
	uint32_t timer;
	uint32_t timer_interval;
	void (*timer_func)(void);
} timers_info_t;

/* LwIP tmr functions list */
static timers_info_t gs_timers_table[] = {
	{0, TCP_TMR_INTERVAL, tcp_tmr},
	{0, IP_TMR_INTERVAL, ip_reass_tmr},
#if 0
	/* LWIP_TCP */
	{0, TCP_FAST_INTERVAL, tcp_fasttmr},
	{0, TCP_SLOW_INTERVAL, tcp_slowtmr},
#endif
	/* LWIP_ARP */
	{0, ARP_TMR_INTERVAL, etharp_tmr},
	/* LWIP_DHCP */
#if LWIP_DHCP
	{0, DHCP_COARSE_TIMER_SECS * 1000, dhcp_coarse_tmr},
	{0, DHCP_FINE_TIMER_MSECS, dhcp_fine_tmr},
#endif
};

extern uint32_t millis() noexcept;

}		// end extern "C"

/**
 * \brief Process timing functions.
 */
void ethernet_timers_update(void) noexcept
{
	static uint32_t ul_last_time;
	uint32_t ul_cur_time, ul_time_diff, ul_idx_timer;
	timers_info_t *p_tmr_inf;

	ul_cur_time = millis();
	ul_time_diff = ul_cur_time - ul_last_time;		// we're using unsigned arithmetic, so this handles wrap around

	if (ul_time_diff) {
		ul_last_time = ul_cur_time;
		for (ul_idx_timer = 0;
			 ul_idx_timer < (sizeof(gs_timers_table) / sizeof(timers_info_t));
			 ul_idx_timer++) {
			p_tmr_inf = &gs_timers_table[ul_idx_timer];
			p_tmr_inf->timer += ul_time_diff;
			if (p_tmr_inf->timer > p_tmr_inf->timer_interval) {
				if (p_tmr_inf->timer_func) {
					p_tmr_inf->timer_func();
				}

				p_tmr_inf->timer -= p_tmr_inf->timer_interval;
			}
		}
	}
}


//************************************************************************************************************

// This sets the static IP configuration on-the-fly
void ethernet_set_configuration(IPAddress ipAddress, IPAddress netMask, IPAddress gateWay) noexcept
{
	ip4_addr_t x_ip_addr, x_net_mask, x_gateway;
	x_ip_addr.addr = ipAddress.GetV4LittleEndian();
	x_net_mask.addr = netMask.GetV4LittleEndian();
	x_gateway.addr = gateWay.GetV4LittleEndian();

	// use static IP address
	netif_set_ipaddr(&gs_net_if, &x_ip_addr);
	netif_set_netmask(&gs_net_if, &x_net_mask);
	netif_set_gw(&gs_net_if, &x_gateway);
}

/** \brief Initialize the Ethernet subsystem.
 *
 */
void init_ethernet(IPAddress ipAddress, IPAddress netMask, IPAddress gateWay) noexcept
{
	ip4_addr_t x_ip_addr, x_net_mask, x_gateway;
	x_ip_addr.addr = ipAddress.GetV4LittleEndian();
	x_net_mask.addr = netMask.GetV4LittleEndian();
	x_gateway.addr = gateWay.GetV4LittleEndian();

	/* Initialize lwIP. */
	lwip_init();

	/* Set hw and IP parameters, initialize MAC too. */
	ethernetif_hardware_init();

	/* Add data to netif */
	netif_add(&gs_net_if, &x_ip_addr, &x_net_mask, &x_gateway, NULL, ethernetif_init, ethernet_input);

	/* Make it the default interface */
	netif_set_default(&gs_net_if);

	/* Set it up */
	netif_set_up(&gs_net_if);
}

// Terminate Ethernet and stop any interrupts, tasks etc. Used when shutting down the whole system.
void ethernet_terminate() noexcept
{
	ethernetif_terminate();
}

/** \brief Configure the Ethernet subsystem. Should be called after init_ethernet()
 *
 */
void ethernet_configure_interface(const uint8_t macAddress[], const char *hostname) noexcept
{
	ethernetif_set_mac_address(macAddress);

#if LWIP_NETIF_HOSTNAME
	netif_set_hostname(&gs_net_if, hostname);
#endif
}

/* \brief Perform ethernet auto-negotiation and establish link. Returns true when ready
 *
 */
bool ethernet_establish_link() noexcept
{
	if (ethernetif_establish_link())
	{
		netif_set_link_up(&gs_net_if);
		return true;
	}
	return false;
}

/* \brief Is the link still up? Also updates the interface status if the link has gone down
 *
 */
bool ethernet_link_established() noexcept
{
	if (!ethernetif_link_established())
	{
		netif_set_link_down(&gs_net_if);
		return false;
	}
	return true;
}

/**
 *  \brief Manage the Ethernet packets, if any received process them.
 *  After processing any packets, manage the lwIP timers.
 *
 *  \return Returns true if data has been processed.
 */
void ethernet_task() noexcept
{
	/* Run periodic tasks */
	ethernet_timers_update();
}

/*
 * \brief Returns the current IP address
 */
void ethernet_get_ipaddress(IPAddress& ipAddress, IPAddress& netMask, IPAddress& gateWay) noexcept
{
	ipAddress.SetV4LittleEndian(gs_net_if.ip_addr.addr);
	netMask.SetV4LittleEndian(gs_net_if.netmask.addr);
	gateWay.SetV4LittleEndian(gs_net_if.gw.addr);
}

// End