#ifndef CORE_IRQ_H__
#define CORE_IRQ_H__

#include <stdint.h>

/*
 * Include file for interrupt service routines.
 */

typedef enum {
#define IRQ_RESERVED(n)
#define IRQ(name_, uname, num) \
  IRQ_##uname = num,
#include "arch/stm32l4xxx/peripherals//isrs.inc"
#undef IRQ
#undef IRQ_RESERVED
} interrupt_t;

/* Defines a set of interrupts so they may be enabled all at once. */
typedef struct {
  uint32_t sysirqs; /* System iterrupts. */
  uint32_t irqs[8];
} interrupt_set_t;

inline static void interrupt_set_add(
    interrupt_set_t* interrupt_set, interrupt_t interrupt)
{
  if (interrupt < 16) {
    interrupt_set->sysirqs |= 1 << interrupt;
    return;
  }

  interrupt -= 16;
  int loc = interrupt / 32;
  int off = interrupt % 32;

  interrupt_set->irqs[loc] |= 1 << off;
}

inline static void interrupt_set_remove(
    interrupt_set_t* interrupt_set, interrupt_t interrupt)
{
  if (interrupt < 16) {
    interrupt_set->sysirqs &= ~(1 << interrupt);
    return;
  }

  interrupt -= 16;
  int loc = interrupt / 32;
  int off = interrupt % 32;

  interrupt_set->irqs[loc] &= ~(1 << off);
}

/*
 * The interrupt service routines. These link in the function `main` as the
 * main function.
 */
extern const void* vectors[];

/*
 * Defines an error state. This loops forever and defines a distinct flashing
 * pattern to let the user know an unhandled ISR happened.
 */
void unhandled_isr(uint8_t val);

#define enable_interrupt(val) \
  {interrupt_set_t itrset = { 0 }; \
   interrupt_set_add(&itrset, val); \
    enable_interrupts(&itrset);}

#define disable_interrupt(val) \
  {interrupt_set_t itrset = { 0 }; \
   interrupt_set_add(&itrset, val); \
    disable_interrupts(&itrset);}

/*
 * Enables the provided interrupt. Note that if the interrupt is one of the
 * system interrupts (first 16) this function has no effect because those
 * interrupts are always enabled.
 */
void enable_interrupts(interrupt_set_t* interrupts);

/*
 * Enables the provided interrupt 
 */
void disable_interrupts(interrupt_set_t* interrupts);

#endif /* CORE_IRQ_H_ */