#ifndef SOCK_H
#define SOCK_H
/* gbos socket API - the kernel owns SLIP/IP/ICMP/UDP/TCP; programs just do
   socket()/connect()/send()/recv()/close(). Header-only: one copy per program.
   The netreq layout must match include/gbos.inc (NR_* / NET_* / SOCK_*). */
#include "gbos.h"

#define SOCK_ICMP 1
#define SOCK_UDP  2
#define SOCK_TCP  3

struct netreq {
    unsigned char op;
    unsigned char sock;
    unsigned char *buf;
    unsigned char len;
    unsigned char ip[4];
    unsigned char port_hi, port_lo;
};
static struct netreq _nr;

/* -> socket id, or 0xFF if the table is full */
static unsigned char net_socket(unsigned char type) {
    _nr.op = 0; _nr.sock = type;
    return sys_net(&_nr);
}
/* set the remote address/port for send()/recv() */
static unsigned char net_connect(unsigned char s, const unsigned char *ip, unsigned int port) {
    unsigned char i;
    _nr.op = 1; _nr.sock = s;
    for (i = 0; i < 4; i++) _nr.ip[i] = ip[i];
    _nr.port_hi = (unsigned char)(port >> 8); _nr.port_lo = (unsigned char)port;
    return sys_net(&_nr);
}
/* send 'len' payload bytes to the connected peer -> 0 ok / 0xFF error */
static unsigned char net_send(unsigned char s, void *buf, unsigned char len) {
    _nr.op = 2; _nr.sock = s; _nr.buf = (unsigned char *)buf; _nr.len = len;
    return sys_net(&_nr);
}
/* receive up to 'max' payload bytes -> length, or 0xFF on timeout */
static unsigned char net_recv(unsigned char s, void *buf, unsigned char max) {
    _nr.op = 3; _nr.sock = s; _nr.buf = (unsigned char *)buf; _nr.len = max;
    return sys_net(&_nr);
}
static void net_close(unsigned char s) {
    _nr.op = 4; _nr.sock = s; sys_net(&_nr);
}
/* pump the RX path once (answers inbound pings) without blocking */
static void net_poll(void) {
    _nr.op = 6; sys_net(&_nr);
}
#endif