////////////////////////////////////////////////////////////////////////////////////////////////////
//
// testcal.cpp
// this file access to google calendar with libgc
// and gest your next meeting
//
// 
// This file is put as exemple - considered it as a draft source code
// debug lines are still here. No memory optimization etc.
// Many constant are hard-coded. Should be in a conf file, etc.
//
// Note : I don't know why, it doesn't work every time. 
// I must run it many times to get it work... ??? If you have an idea why, please contact me.
//
// Pierre Raufast - 2013
// (for a better world, read Giono's books)
//
////////////////////////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <unistd.h>
#include <time.h>

extern "C" {
#include "inc/gcalendar.h"
}




int main(int argc, char *argv[])
{
	// google calendar structures
	gcal_t gcal;
	gcal_event_t myevent;
	struct gcal_event_array event_array;
	int result,result2,i,minEvent=-1;
	
	// now
	time_t now;
	double elapsed, minsec=0.0;
	int year,month,day,hour,min,rdvhour=0,rdvmin=0;
	
	// get time
	time(&now);
	
	/* Create a gcal 'object' and authenticate with server */
	if (!(gcal = gcal_new(GCALENDAR)))
	{
		return 0;
	}
  	printf ("Current local time and date: %s", asctime(localtime (&now)));
	
	struct tm e_time {0}; 
	time_t e_time2; 
	minsec=2592000.0; // 1 month;		         	
    if (argc == 3)
            result2 = gcal_get_authentication(gcal, argv[1], argv[2]);
    else
            result2 = gcal_get_authentication(gcal, "mylogin","mypassword");
	
	if (result2!=0)
 	{
 		printf(" error");
 		gcal_delete(gcal);
    	return 0;
 	}
	sleep(3);	 
	
	// get all events       
	result = gcal_get_events(gcal, &event_array);
 	if (result==-1)
 	{
 		printf(" error");
 		gcal_delete(gcal);
    	return 0;
 	}
 	
 	
	// for each event, get time, take nearest to now	      
	for (i=0;i<(int)event_array.length;i++)
	{
		myevent=gcal_event_element(&event_array,i);
	 	sscanf(gcal_event_get_start(myevent),"%d-%d-%dT%d:%d",&year,&month,&day,&hour,&min);
	 	e_time.tm_sec = 0; 
		e_time.tm_min = min; 
		e_time.tm_hour = hour; 
		e_time.tm_mday = day; 
		e_time.tm_mon = month-1; 
		e_time.tm_year = year-1900; 
		e_time.tm_isdst = 0;   
		e_time2 = mktime(&e_time); 
	 	
	 	double elapsed = difftime(e_time2,now);
	 	//printf("(%d) %lf\n",i,elapsed);
	 	if ((elapsed>0.0)&&(elapsed<minsec))
		{
			minsec  	= elapsed;
			rdvhour 	= hour;
			rdvmin		= min; 
			minEvent 	= i;
		}
	}
	
	if (minEvent!=-1)
	{
		// display nearest event	     
		myevent=gcal_event_element(&event_array,minEvent);
		printf("My next meeting is (%s) at (%02d:%02d)\n",gcal_event_get_title(myevent),rdvhour,rdvmin);	
	}
	else
	{
		printf("no event found (%d)\n",(int)event_array.length);
	}
	// close, clean
	gcal_cleanup_events(&event_array);
	gcal_delete(gcal);

    return 0;

}