/* ARISA - Perl Engine - Thread Entry Point
 * Copyright (C) 2004 Carl Ritson
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <EXTERN.h>
#include <perl.h>

#include "arisa.h"
#include "script-eng.h"
#include "engine.h"
#include "linkage.h"

interpreter_t *perl_engine_interpreter = NULL;

static plocal_t *setup_local(plocal_t *l, interpreter_t *intp) {
	int fds[2];
	
	l->interpreter = intp;
	
	LOCK(intp);
	l->msgqueue = &(intp->msgqueue);
	UNLOCK(intp);
	l->log_msgs = pqueue_init(NULL,1);
	
	if(pipe(fds) != 0) {
		LOGTP(L_ERR,"Failed to allocate signaling pipe");
		l->signal_fd = -1;
	} else {
		fcntl(fds[0],F_SETFL,O_NONBLOCK);
		fcntl(fds[1],F_SETFL,O_NONBLOCK);
		l->signal_fd = fds[0];
		pqueue_set_notification_fd(l->msgqueue,fds[1]);
		pqueue_set_notification_fd(l->log_msgs,fds[1]);
	}

	l->my_perl = NULL;
	
	return l;
}
		
void *perl_thread(void *ptr) {
	interpreter_t *intp = (interpreter_t *)ptr;
	struct timeval tv, last_tick, now;
	unsigned long tmp;
	se_msg_t *msg;
	fd_set rd_set;
	plocal_t local,*l;
	char buffer[16], *p;
	int ret;
	
	thread_signal_started(&(intp->thread));
	LOG_TITLE("Perl Engine");
	
	l = setup_local(&local,intp);
	init_perl(l);
	
	log_subscribe(l->log_msgs);
	
	gettimeofday(&now,NULL);
	memcpy(&last_tick,&now,sizeof(struct timeval));
	
	LOGTP(L_INF,"Started");

	while(!thread_should_end()) {
		tmp = (1000000 - diff_tv_usec(&now,&last_tick));
		if(tmp < 5000)
			tmp = 5000;
		else if(tmp > 1000000)
			tmp = 1000000;
		
		if(l->signal_fd != -1) {
			FD_ZERO(&rd_set);
			FD_SET(l->signal_fd,&rd_set);
			tv.tv_sec = tmp / 1000000;
			tv.tv_usec = tmp - (tv.tv_sec * 1000000);
			ret = select((l->signal_fd+1),&rd_set,NULL,NULL,&tv);
		} else
			usleep(tmp);

		if(l->signal_fd != -1) {
			if(FD_ISSET(l->signal_fd,&rd_set)) {
				do {
					ret = read(l->signal_fd,buffer,1);
				} while(ret != -1);
			}
		}
		
		while((msg = pqueue_pop_front(l->msgqueue)) != NULL) {
			se_msg_type_t type = msg->type;
			
			perl_handle_msg(l,msg);
			free_msg(msg);
			
			if(type == SE_SHUTDOWN)
				goto out;
		}

		while((p = pqueue_pop_front(l->log_msgs)) != NULL) {
			perl_handle_log_msg(l,p);
			xfree(p);
		}
			
		gettimeofday(&now,NULL);
		if(diff_tv_usec(&now,&last_tick) >= 950000) {
			memcpy(&last_tick,&now,sizeof(struct timeval));
			perl_tick(l,&now);
		}
	}

out:
	log_unsubscribe(l->log_msgs);
	pqueue_set_notification_fd(l->log_msgs,-1);
	pqueue_free(l->log_msgs,xfree);
	l->log_msgs = NULL;
	
	if(l->signal_fd != -1)
		close(l->signal_fd);
	
	deinit_perl(l);
	
	LOGTP(L_INF,"Shutdown");
	thread_signal_finished();
	
	return NULL;
}

void perl_register(void) {
	interpreter_t *intp = alloc_interpreter();
	intp->name = xstrdup(PERL_ENGINE_NAME);
	intp->func = perl_thread;
	intp->flags = SE_F_LOAD_SAVE;
	PTRARR_ADD(&(intp->types),&(intp->no_types),xstrdup("*.pl"));
	if(se_register_interpreter(intp) == -1)
		free_interpreter(intp);
	else
		perl_engine_interpreter = intp;
}