#ifndef _keeloq1_c
#define _keeloq1_c

#include "keeloq1.h"
#include "keeloq.c"


uint8_t generate_message(uint8_t *m0, uint8_t buttons, REMOTE_ENTRY *remote)
{
MESSAGE1 *m =  & ((MESSAGE1UNION *)m0)->m;
m->fix.buttons = buttons;
m->fix.serial = remote->serial;

m->var.plaintext.buttons = buttons;
m->var.plaintext.ovr=0;
m->var.plaintext.discriminator = remote->discriminator;
m->var.plaintext.counter = remote->counter++;

encrypt1(&m->var,&remote->keeloq);

m0[8]=1; //last bit
return 65;
}


uint8_t process_message(uint8_t *buttons, uint8_t *serial, uint8_t *m0, uint8_t n_remotes, REMOTE_ENTRY  *remotes, uint16_t *resync)
{
uint8_t i,n;
MESSAGE1 *m =  & ((MESSAGE1UNION *)m0)->m;
for(i=0; i<n_remotes; ++i) if(m->fix.serial == remotes[i].serial) goto remote_found;
#ifdef debug
printP(PSTR("remote not on list"));
#endif
return 1;

remote_found:
*serial=i;
decrypt1(&m->var,&remotes[i].keeloq);
if(m->var.plaintext.discriminator != remotes[i].discriminator) return 2;
if(m->fix.buttons != m->var.plaintext.buttons) return 3;

*buttons = m->fix.buttons;

//now check whether the counter is in active or resyncs windows
uint16_t counter = m->var.plaintext.counter;
//handle resync now
if(resync[i]) 
	{
	if(counter==resync[i]) return 4; //accidentally repeatedly received
	if(counter==resync[i]+1) //success
                {
#ifdef debug
                printP(PSTR("resync OK\n"));
#endif
                remotes[i].counter=counter;
                resync[i]=0;
                return 0;
                }
	else
                {
#ifdef debug
                printP(PSTR("resync failed\n"));
#endif
                resync[i]=0;
                return 5;
                }
        }

//ignore if counter is equal or below stored counter
//request resync if counter is more than 16 advanced

{
int32_t cdiff;
cdiff=(int32_t)counter-(int32_t)remotes[i].counter; //treat correctly overflows
if(cdiff<=0 && cdiff >= -65500 ) return 6;
if(cdiff>16 || cdiff < -65500) //needs resync
        {
#ifdef debug
        printP(PSTR("resync requested\n"));
#endif
        resync[i]=counter;
        return 7;
        }
}
remotes[i].counter=counter; //store recent value

return 0;
}



#endif