#include "headers/timer.h"
#include "headers/isr.h"
#include "headers/screen.h"
#include <stdint.h>

uint32_t tick = 0;
extern uint8_t current_color;
static void timer_callback(registers_t *regs)
{
    regs->eax++; // get it to compile fix this
           // later(regs is not really needed)
    tick++;
	static int j = 0;
	j = j%15;
	current_color = j++;
	kprintf("%d\n", tick);
}

void init_timer(uint32_t frequency)
{
    // firstly register our timer callback
    register_interrupt_handler(IRQ0, &timer_callback);

    // the vaue sent to the pit is its clock divisor
    // (1193180 Hz) the divisor must be small enough
    // to fit into 16 bits
    uint32_t divisor = 1193180 / frequency;

    // send the command byte
    outb(0x43, 0x36);

    // divsor is set in bytes so serialize it
    uint8_t l = (uint8_t)(divisor & 0xff);
    uint8_t h = (uint8_t)( (divisor>>8) & 0xff);

    // send the freq divisor
    outb(0x40, l);
    outb(0x40, h);
}