#include "lapic.h"
#include "lapic_registers.h"

namespace LAPIC {
namespace Timer {

/*! \brief Timer Delivery Status */
enum DeliveryStatus { IDLE = 0, SEND_PENDING = 1 };

/*! \brief Timer Mode */
enum TimerMode {
  ONE_SHOT = 0,
  PERIODIC = 1,
  DEADLINE = 2
  // reserved
};

/*! \brief Timer Mask */
enum Mask { NOT_MASKED = 0, MASKED = 1 };

static const Register INVALID_DIV = 0xff;

/*! \brief LAPIC-Timer Control Register
 *
 * \see [ISDMv3 10.5.1 Local Vector Table](intel_manual_vol3.pdf#page=375)
 */
union ControlRegister {
  struct {
    uint32_t vector : 8;  ///< Vector
    uint32_t : 4;
    DeliveryStatus delivery_status : 1;  ///< Delivery Status (readonly)
    uint32_t : 3;
    Mask masked : 1;  ///< Interrupt Mask (if set, interrupt will not trigger)
    TimerMode timer_mode : 2;  ///< Timer Mode
    uint32_t : 13;
  };
  Register value;
} __attribute__((packed));

/*! \brief LAPIC timer divider table
 *
 * \see [ISDMv3 10.5.4 APIC Timer](intel_manual_vol3.pdf#page=378)
 */
static const Register div_masks[] = {
    0xb,  ///< divides by   1
    0x0,  ///< divides by   2
    0x1,  ///< divides by   4
    0x2,  ///< divides by   8
    0x3,  ///< divides by  16
    0x8,  ///< divides by  32
    0x9,  ///< divides by  64
    0xa   ///< divides by 128
};

/*! \brief Calculate the bit mask for the LAPIC-timer divider.
 *  \param div Divider, must be power of two: 1, 2, 4, 8, 16, 32, 64, 128
 *  \return Bit mask for LAPIC::setTimer() or `0xff` if `div` is invalid.
 */
Register getClockDiv(uint8_t div) {
  (void)div;
  return 0;
}

uint32_t ticks(void) {
  uint32_t ticks = 0;  // ticks per millisecond
  // Calculation (Assignment 5)
  return ticks;
}

void set(uint32_t counter, uint8_t divide, uint8_t vector, bool periodic,
         bool masked) {
  (void)counter;
  (void)divide;
  (void)vector;
  (void)periodic;
  (void)masked;
}

bool setup(uint32_t us) {
  (void)us;
  return false;
}

uint32_t interval() { return 0; }

void activate() {}

void setMasked(bool masked) { (void)masked; }

}  // namespace Timer
}  // namespace LAPIC