#include <Adafruit_LEDBackpack.h>   // Support for the Backpack FeatherWing
#include <Adafruit_GFX.h>           // Adafruit's graphics library
#include <Adafruit_I2CDevice.h>
#include <SPI.h>
#include "ntp_time.h"

#define DISPLAY_ADDRESS 0x70
#define BRIGHTNESS 0
#define BRIGHTNESS_STEP 1

namespace Display {

  uint8_t brightness = BRIGHTNESS;
  int currentHour = -1;
  int currentMin = -1;

  // Create display object
  Adafruit_7segment clockDisplay = Adafruit_7segment();

  void adjustTime() {
    int displayHour = hour();
    int displayMinute = minute();
    int displayValue = displayHour * 100 + displayMinute;

    // Print the time on the display
    clockDisplay.print(displayValue, DEC);

    // Add zero padding when in 24 hour mode and it's midnight.
    // In this case the print function above won't have leading 0's
    // which can look confusing.  Go in and explicitly add these zeros.
    if (displayHour == 0) {
      clockDisplay.writeDigitNum(1, 0);
      if (displayMinute < 10) {
        clockDisplay.writeDigitNum(3, 0);
      }
    }
  }

  void changeBrightness(bool increase) {
    increase ? brightness = (brightness + BRIGHTNESS_STEP) % 15 : brightness = (brightness - BRIGHTNESS_STEP) % 15;
    clockDisplay.setBrightness(brightness);
  }

  void adjustBrightness() {
    if (currentHour > 8 && currentHour < 17) {
      brightness = 11;
    } else {
      brightness = BRIGHTNESS;
    }
    clockDisplay.setBrightness(brightness);
  }

  void displayColon() {
    static bool colonOn = false;

    if (colonOn) {
      if (currentHour != hour()) {
        currentHour = hour();
        Display::adjustBrightness();
        hourChanged.signal();
        if (currentHour == 8) dayChanged.signal();
      }
      if (currentMin != minute()) {
        currentMin = minute();
        adjustTime();
      }
    }
    clockDisplay.drawColon(colonOn);
    clockDisplay.writeDisplay();

    colonOn = !colonOn;
  }

  void displayValue(int value) {
    clockDisplay.print(value, HEX);
    clockDisplay.writeDisplay();
  }

  void setup() {
    clockDisplay.begin(DISPLAY_ADDRESS);
    clockDisplay.setBrightness(brightness);
    adjustTime();
    displayColon();
  }
}