#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pigpiod_if2.h>

void init(int pi)
{
    set_mode(pi,4,PI_OUTPUT);	// set PIN4 to output
  	gpio_write(pi,4,1);			// set common DISABLE

    set_mode(pi,2,PI_OUTPUT);	// set PIN2 to output
	gpio_write(pi,2,0);			// turn off OUT1

    set_mode(pi,3,PI_OUTPUT);	// set PIN3 to output
    gpio_write(pi,3,0);			// turn off OUT2

    set_mode(pi,5,PI_OUTPUT);	// set PIN5 to output
    gpio_write(pi,5,0);			// turn of Sirene

    gpio_write(pi,4,0);			// clear common DISABLE
}

void help(void)
{
    printf("rpi-sirene v1.0\r\n\r\n");
    printf("\tsirene ton[ms] toff[ms]\r\n");
    printf("\tsirene -h => help\r\n");
    printf("\tsirene -i => init\r\n\r\n");
}

int main(int argc, char *argv[])
{
    int on=200;
    int off=80;
    int cyc=10;
	int pi;

	pi = pigpio_start(0,0); /* Connect to local Pi. */

	 if (pi < 0)
     {
    	 printf("Can't connect to pigpio daemon\r\n");
         return 1;
     }

    if ((argc==2)&&(strstr(argv[1],"-h")!=NULL))
    {
        help();
		pigpio_stop(pi); 
        return 2;
    }
	else if ((argc==2)&&(strcmp(argv[1],"-i")==0))
	{
		init(pi);
		pigpio_stop(pi);
		return 0;
	}
    else
    {
        switch(argc)
        {
            case 3: if (atoi(argv[2])) off=atoi(argv[2]);
            case 2: if (atoi(argv[1])) on=atoi(argv[1]);
        }

        cyc=12000/(on+off);

		if (gpio_read(pi,3)==1)
		{
			printf("Another instance of 'sirene' is running!\r\n");
			pigpio_stop(pi);
			return 0;
		}

       	gpio_write(pi,3,1);

        while (cyc!=0)
        {
        	gpio_write(pi,5,1);
            usleep(on*1000);
        	gpio_write(pi,5,0);
            usleep(off*1000);
            cyc--;
        }
       	gpio_write(pi,3,0);
       	gpio_write(pi,5,0);
    }
	pigpio_stop(pi);
}