//Main
/****************************************************************
* Author: kh@ipimp.at
*****************************************************************
* Minimum setup of GPIO 
****************************************************************/
#include "gpio.h"   // Generel Purpose Input/Output
#include "rcc.h"		// Reset and clock Control
#include "usart.h"
#include "I2C.h"
#include <stdio.h>
#include <stdint.h>	
#define EPOCH_YEAR 1970	// Start year
#define TIME_ZONE 3600	// +1 GMT (Denmark)
#define DAYLIGHT_SAVING 1 // Winter = 1
#define DEBUG_INFO 0 // Winter = 1

/*
 *	Time structure
 */ 
struct time {
	int sec;
	int min;
	int hour;
	int day;
	int month;
	int year;
};

/*
 * Check if year is leap year
 */
int leap_year(int year){
	if(year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)){
        return 1; // Is leap year
    }
    else {
        return 0; // Is not leap year
    }
}

/*
 * Get year lenght in days
 */
int year_len(int year){
	if(leap_year(year)){
		return 366; // 366 days in leap year
	} 
	else {
		return 365; // 365 days in normal year
	}
}

/*
 * Get month lenght in days 
 */
int month_len(int month, int year){
	if(month == 2){
		// February is 28/29 days	
		return (leap_year(year) ? 29 : 28);
	}
	else {
		// Normal is 30/31 days
		return ((month - 1) % 7 % 2 ? 30 : 31);
	}
}

/*
 * Convert time to seconds
 */
int time_to_seconds(struct time *t){
	int i, seconds;

	// Year
	if(DEBUG_INFO)
		printf("Calculating seconds since %i\r\n", EPOCH_YEAR);
	for(i = EPOCH_YEAR; i<t->year; i++){
		int days;
		days = year_len(i);

		if(DEBUG_INFO)
			printf("Calculating number of seconds in year %i (days: %i)\r\n", i, days);
		// Convert year to seconds
		seconds += 60*60*24*days;
	}

	// Month
	for(i = 1; i<t->month; i++){
		int days;
		days = month_len(i, t->year);
		
		if(DEBUG_INFO)	
			printf("Calculating number of seconds in month %i in %i (days: %i)\r\n", i, t->year, days);
		seconds += 60*60*24*days;
	}

	// Days
	if(DEBUG_INFO)	
			printf("Calculating seconds in days in month %i in year %i\r\n", t->month, t->year);
	for(i = 1; i<t->day; i++){
		if(DEBUG_INFO)	
			printf("Calculating number of seconds in day %i in month %i\r\n", i, t->month);
		seconds += 60*60*24;
	}

	// Hours
	if(DEBUG_INFO)	
			printf("Calculating seconds in hours in day %i in month %i\r\n", t->day, t->month);
	seconds += 60*60*t->hour;

	// Minuts
	if(DEBUG_INFO)	
			printf("Calculating seconds in minuts in hour %i in day %i in month %i\r\n", t->hour, t->day, t->month);
	seconds += 60*t->min;
	
	// Seconds
	if(DEBUG_INFO)	
			printf("Adding remaining seconds\r\n");
	seconds += t->sec;

	// Correct daylight saving
	if(DAYLIGHT_SAVING)
		seconds -= 3600;

	// Correct Time Zone
	seconds -= TIME_ZONE;

	return seconds;
}

/*
 * Convert seconds to time
 */
int seconds_to_time(int seconds, struct time *t){
	return 0;
}


int main (void) {
	int seconds;
	struct time t;

	// Start Clock on GPIO Port E (Enable port E)
	rcc_apb2enr(RCC_APB2ENR_IOPEEN,ENABLE);
	rcc_clockmode5();
	usart_enable();
	
    //unsigned int volatile * const RSSE2 = (unsigned int *) (RCC_BASE + 0x18);	
	//*RSSE2 |= 1 << 6;
	//Setting bit 8 to 15 of PORT E to Generel Purpose output push-pull max 50Mhz
	GPIOE->CRH=0x33333333;
	putstr("\x1b[2J\x1b[H");

	putstr("I2C Initialise\n\r"); 
	I2C_Init();

	
	printf("Setting time\r\n");
	// Convert datetime struct to secconds
	t.sec  = 44;
    t.min  = 11;
    t.hour = 22;
    t.day = 5;
    t.month  = 7;
    t.year = 2012;

	seconds = time_to_seconds(&t);

	printf("Converted %i-%i-%i %02i:%02i:%02i to %i secs\r\n", t.year, t.month, t.day, t.hour, t.min, t.sec, seconds);


	//Do stuff
	printf("Starting main-loop\r\n");
	printf("==================\r\n\n");
	while (1) {
		// Running
	}

}