#include "countdown.h"
#include "screen/menu.h"
#include "display.h"
#include "state.h"
#include "config.h"
#include "buzzer.h"


inline uint32_t intDivCeil(uint32_t x, uint32_t y)
{
  return x / y + (x % y != 0);
}


void CountdownScreen::printRemainingTime()
{
  LCDPrintLineCentered(getDisplay(), 1, FormatTime(mLastDisplayed));
}


void CountdownScreen::onShow()
{
  LCDPrintLineCentered(getDisplay(), 0, "Exposing...");

  uint32_t remaining = GetExposureTimeRemaining(getCurrentTime());
  mLastDisplayed = intDivCeil(remaining, 1000);

  printRemainingTime();

  analogWrite(PinLED, map(GetExposureIntensity(), 0, 100, 0, 255));
}


void CountdownScreen::onHide()
{
  digitalWrite(PinLED, LOW);
}


void CountdownScreen::onButton()
{
  // TODO Confirmation?
  Buzzer::click();
  getScreenManager()->show<MenuScreen>();
}


void CountdownScreen::onEncoder(int32_t lastPosition, int32_t newPosition)
{
  // TODO Allow adding / removing time?
}


void CountdownScreen::onTick()
{
  uint32_t remaining = GetExposureTimeRemaining(getCurrentTime());
  remaining = intDivCeil(remaining, 1000);

  if (remaining == 0)
  {
    mLastDisplayed = 0;

    LCDPrintLineCentered(getDisplay(), 0, "Done!");
    printRemainingTime();
    digitalWrite(PinLED, LOW);

    Buzzer::completed();

    ResetExposureTimer();
    getScreenManager()->show<MenuScreen>();
  }
  else if (remaining != mLastDisplayed)
  {
    mLastDisplayed = remaining;
    printRemainingTime();
  }
}