/* 
 * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
 *                               RWTH Aachen University
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * This file is part of MetalSVM. 
 */

#include <metalsvm/stddef.h>
#include <metalsvm/stdio.h>
#include <metalsvm/string.h>
#include <metalsvm/processor.h>
#include <metalsvm/time.h>
#include <metalsvm/tasks.h>
#include <metalsvm/errno.h>
#include <metalsvm/init.h>
#include <metalsvm/fs.h>
#ifdef CONFIG_LWIP
#include <lwip/init.h>
#include <lwip/sys.h>
#include <lwip/stats.h>
#include <lwip/udp.h>
#include <lwip/tcp.h>
#include <lwip/tcpip.h>
#include <lwip/dhcp.h>
#include <lwip/netif.h>
#include <lwip/timers.h>
#include <netif/etharp.h>
#endif
#include <net/rtl8139.h>
#include <net/rckemac.h>
#include <net/mmnif.h>
#ifdef CONFIG_ROCKCREEK
#include <asm/RCCE.h>
#include <asm/RCCE_lib.h>
#endif

void echo_init(void);
void ping_init(void);
void netio_init(void);
int test_init(void);

/* 
 * Note that linker symbols are not variables, they have no memory allocated for
 * maintaining a value, rather their address is their value.
 */
extern const void bss_start;
extern const void bss_end;

int lowlevel_init(void)
{
	// initialize .bss section
	memset((void*)&bss_start, 0x00, ((size_t) &bss_end - (size_t) &bss_start));

	koutput_init();

	//kprintf("Now, the BSS section (0x%x - 0x%x) is initialized.\n", (size_t) &bss_start, (size_t) &bss_end);

	return 0;
}

#if defined(CONFIG_LWIP) && (defined(CONFIG_PCI) || defined(CONFIG_ROCKCREEK))
static struct netif*	default_netif = NULL;

static int init_netifs(void)
{
	struct ip_addr	ipaddr;
	struct ip_addr	netmask;
	struct ip_addr	gw;

	kputs("Initialize NICs...\n");

	// Set up the lwIP network interface
	// Allocate and configure netif
	default_netif = (struct netif *) mem_malloc(sizeof(struct netif));
	if(default_netif == NULL)
	{
		kprintf("ERROR: Out of memory for default netif\n");
		return -ENOMEM;
	}
 
	memset(default_netif, 0x00, sizeof(struct netif));
#ifdef CONFIG_ROCKCREEK
	/* Set network address variables */
	IP4_ADDR(&gw, 192,168,28,254);
	IP4_ADDR(&ipaddr, 192,168,28,RCCE_ue()+1);
	IP4_ADDR(&netmask, 255,255,255,0);

	/* Bring up the network interface */
	if (!netif_add(default_netif, &ipaddr, &netmask, &gw, NULL, rckemacif_init, tcpip_input)) {
		kputs("Unable to add network interface\n");
		return -ENODEV;
	}

	netif_set_default(default_netif);
	netif_set_up(default_netif);

	//mmnif_open();
#else
	/* Clear network address because we use DHCP to get an ip address */
	IP4_ADDR(&gw, 0,0,0,0);
	IP4_ADDR(&ipaddr, 0,0,0,0);
	IP4_ADDR(&netmask, 0,0,0,0);

	/* Bring up the network interface */
	if (!netif_add(default_netif, &ipaddr, &netmask, &gw, NULL, rtl8139if_init, tcpip_input)) {
		kputs("Unable to add network interface\n");
		return -ENODEV;
	}

	netif_set_default(default_netif);

	kprintf("Starting DHCPCD...\n");
	dhcp_start(default_netif);
#endif

	return 0;
}
#endif

#ifdef CONFIG_LWIP
static void tcpip_init_done(void* arg)
{
	sys_sem_t* sem = (sys_sem_t*)arg;

#if defined(CONFIG_LWIP) && (defined(CONFIG_PCI) || defined(CONFIG_ROCKCREEK))
	init_netifs();
#endif
	sys_sem_signal(sem);
}
#endif

#ifdef CONFIG_LWIP
static int network_shutdown(void)
{
#ifdef CONFIG_ROCKCREEK
	if (default_netif) {
		netif_set_link_down(default_netif);
		mem_free(default_netif);
		default_netif = NULL;
	}
	//mmnif_close();
#elif defined(CONFIG_PCI)
	if (default_netif) {
		dhcp_release(default_netif);
		dhcp_stop(default_netif);
		mem_free(default_netif);
		default_netif = NULL;
	}
#endif

	return 0;
}
#endif

int shutdown(void)
{
#ifdef CONFIG_LWIP
	return network_shutdown();
#else
	return 0;
#endif
}

static void list_fs(vfs_node_t* node, uint32_t depth)
{
	int j, i = 0;
	dirent_t* dirent = NULL;
	fildes_t* file = kmalloc(sizeof(fildes_t));
	file->offset = 0;
	file->flags = 0;


	while ((dirent = readdir_fs(node, i)) != 0) {
		for(j=0; j<depth; j++)
			kputs("  ");
		kprintf("%s\n", dirent->name);

		if (strcmp(dirent->name, ".") && strcmp(dirent->name, "..")) {
			vfs_node_t *new_node = finddir_fs(node, dirent->name);
			if (new_node) {
				if (new_node->type == FS_FILE) {
					char buff[16] = {[0 ... 15] = 0x00};
					
					file->node = new_node;
					file->offset = 0;
					file->flags = 0;

					read_fs(file, (uint8_t*)buff, 8);
					for(j=0; j<depth+1; j++)
						kputs("  ");
					kprintf("content: %s\n", buff);
				} else list_fs(new_node, depth+1);
			}
		}

		i++;
	}
	kfree(file, sizeof(fildes_t));
}

static void list_root(void) {
	kprintf("List of the file system:\n/\n");
	list_fs(fs_root, 1);
}

int initd(void* arg)
{
#ifdef CONFIG_LWIP
	sys_sem_t	sem;

	// Initialize lwIP modules
	if(sys_sem_new(&sem, 0) != ERR_OK)
		LWIP_ASSERT("Failed to create semaphore", 0);
	tcpip_init(tcpip_init_done, &sem);
	sys_sem_wait(&sem);
	kprintf("TCP/IP initialized.\n");
	sys_sem_free(&sem);

#if defined(CONFIG_LWIP) && (defined(CONFIG_PCI) || defined(CONFIG_ROCKCREEK))
	/* test if interface is really up */
	if (!netif_is_up(default_netif)) {
		kputs("network interface is not up\n");
		return -ENODEV;
	}
#endif

#ifndef CONFIG_ROCKCREEK
	int mscnt = 0;
	/* wait for ip address */
	while(default_netif && !default_netif->ip_addr.addr) {
		sys_msleep(DHCP_FINE_TIMER_MSECS);
		dhcp_fine_tmr();
		mscnt += DHCP_FINE_TIMER_MSECS;
		if (mscnt >= DHCP_COARSE_TIMER_SECS*1000) {
			dhcp_coarse_tmr();
			mscnt = 0;
		}
	}
#endif

	// start echo, ping and/or netio server
	//echo_init();
	//ping_init();
	//netio_init();
#endif

	//list_root();
	test_init();
	
	return 0;
}