#include <syslinux/pxe_api.h>
#include <lwip/api.h>
#include <lwip/tcpip.h>
#include <lwip/dns.h>
#include <core.h>
#include <net.h>
#include "pxe.h"

/**
 * Open a socket
 *
 * @param:socket, the socket to open
 * @param:proto, the protocol of the new connection
 *
 * @out: error code, 0 on success, -1 on failure
 */
int net_core_open(struct pxe_pvt_inode *socket, enum net_core_proto proto)
{
    struct net_private *priv = &socket->private;
    enum netconn_type type;
    int err;

    switch (proto) {
    case NET_CORE_TCP:
	type = NETCONN_TCP;
	break;
    case NET_CORE_UDP:
	type = NETCONN_UDP;
	break;
    default:
	type = NETCONN_INVALID;
	break;
    }

    priv->conn = netconn_new(type);
    if (!priv->conn)
	return -1;

    priv->conn->recv_timeout = 15; /* A 15 ms recv timeout... */
    err = netconn_bind(priv->conn, NULL, 0);
    if (err) {
	printf("netconn_bind error %d\n", err);
	return -1;
    }

    return 0;
}

/**
 * Close a socket
 *
 * @param:socket, the socket to open
 */
void net_core_close(struct pxe_pvt_inode *socket)
{
    struct net_private *priv = &socket->private;

    if (priv->conn) {
	netconn_delete(priv->conn);
	priv->conn = NULL;
    }
}

/**
 * Establish a connection on an open socket
 *
 * @param:socket, the open socket
 * @param:ip, the ip address
 * @param:port, the port number, host-byte order
 */
void net_core_connect(struct pxe_pvt_inode *socket, uint32_t ip,
		      uint16_t port)
{
    struct net_private *priv = &socket->private;
    struct ip_addr addr;

    addr.addr = ip;
    netconn_connect(priv->conn, &addr, port);
}

/**
 * Tear down a connection on an open socket
 *
 * @param:socket, the open socket
 */
void net_core_disconnect(struct pxe_pvt_inode *socket)
{
    struct net_private *priv = &socket->private;
    netconn_disconnect(priv->conn);
}

/**
 * Read data from the network stack
 *
 * @param:socket, the open socket
 * @param:buf, location of buffer to store data
 * @param:buf_len, size of buffer

 * @out: src_ip, ip address of the data source
 * @out: src_port, port number of the data source, host-byte order
 */
int net_core_recv(struct pxe_pvt_inode *socket, void *buf, uint16_t *buf_len,
		  uint32_t *src_ip, uint16_t *src_port)
{
    struct net_private *priv = &socket->private;
    struct netbuf *nbuf;
    u16_t nbuf_len;
    int err;

    err = netconn_recv(priv->conn, &nbuf);
    if (err)
	return err;

    if (!nbuf)
	return -1;

    *src_ip = netbuf_fromaddr(nbuf)->addr;
    *src_port = netbuf_fromport(nbuf);

    netbuf_first(nbuf);		/* XXX needed? */
    nbuf_len = netbuf_len(nbuf);
    if (nbuf_len <= *buf_len)
	netbuf_copy(nbuf, buf, nbuf_len);
    else
	nbuf_len = 0; /* impossible mtu < PKTBUF_SIZE */
    netbuf_delete(nbuf);

    *buf_len = nbuf_len;
    return 0;
}

/**
 * Send a UDP packet.
 *
 * @param:socket, the open socket
 * @param:data, data buffer to send
 * @param:len, size of data bufer
 */
void net_core_send(struct pxe_pvt_inode *socket, const void *data, size_t len)
{
    struct netconn *conn = socket->private.conn;
    struct netbuf *nbuf;
    void *pbuf;
    int err;

    nbuf = netbuf_new();
    if (!nbuf) {
	printf("netbuf allocation error\n");
	return;
    }

    pbuf = netbuf_alloc(nbuf, len);
    if (!pbuf) {
	printf("pbuf allocation error\n");
	goto out;
    }

    memcpy(pbuf, data, len);

    err = netconn_send(conn, nbuf);
    if (err) {
	printf("netconn_send error %d\n", err);
	goto out;
    }

out:
    netbuf_delete(nbuf);
}

/**
 * Network stack-specific initialization
 */
void net_core_init(void)
{
    int err;
    int i;

    http_bake_cookies();

    /* Initialize lwip */
    tcpip_init(NULL, NULL);

    /* Start up the undi driver for lwip */
    err = undiif_start(IPInfo.myip, IPInfo.netmask, IPInfo.gateway);
    if (err) {
       printf("undiif driver failed to start: %d\n", err);
       kaboom();
    }

    for (i = 0; i < DNS_MAX_SERVERS; i++) {
	/* Transfer the DNS information to lwip */
	dns_setserver(i, (struct ip_addr *)&dns_server[i]);
    }
}

void probe_undi(void)
{
    /* Probe UNDI information */
    pxe_call(PXENV_UNDI_GET_INFORMATION, &pxe_undi_info);
    pxe_call(PXENV_UNDI_GET_IFACE_INFO,  &pxe_undi_iface);

    printf("UNDI: baseio %04x int %d MTU %d type %d \"%s\" flags 0x%x\n",
	   pxe_undi_info.BaseIo, pxe_undi_info.IntNumber,
	   pxe_undi_info.MaxTranUnit, pxe_undi_info.HwType,
	   pxe_undi_iface.IfaceType, pxe_undi_iface.ServiceFlags);
}

