#include <LiquidCrystal.h>
#include <RTClib.h>

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
RTC_DS1307 rtc;

#define RED 9
#define GREEN 10
#define BLUE 11

#define BTN_THEME 8
#define BTN_MODE 12

int theme = 0;
bool analogMode = false;

void setColor(int r, int g, int b) {
  analogWrite(RED, r);
  analogWrite(GREEN, g);
  analogWrite(BLUE, b);
}

void autoDayNight(int hour) {
  if (hour >= 6 && hour < 18) {
    setColor(0, 150, 255);   // Day
  } else {
    setColor(150, 0, 255);   // Night
  }
}

void manualTheme() {
  switch(theme) {
    case 1: setColor(255,0,0); break;
    case 2: setColor(0,255,0); break;
    case 3: setColor(0,0,255); break;
    case 4: setColor(255,255,0); break;
    default: autoDayNight(rtc.now().hour());
  }
}

void drawAnalog(int h, int m) {
  lcd.clear();
  lcd.setCursor(4,0);
  lcd.print("Analog Clock");

  int pos = map(m, 0, 59, 0, 15);
  lcd.setCursor(pos,1);
  lcd.print("*");
}

void setup() {
  lcd.begin(16,2);

  if (!rtc.begin()) {
    lcd.print("RTC ERROR");
    while(1);
  }

  // SET TIME AUTOMATICALLY (FIRST RUN ONLY)
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);

  pinMode(BTN_THEME, INPUT_PULLUP);
  pinMode(BTN_MODE, INPUT_PULLUP);
}

void loop() {
  DateTime now = rtc.now();

  // Theme Button
  if (!digitalRead(BTN_THEME)) {
    theme++;
    if (theme > 4) theme = 0;
    delay(300);
  }

  // Mode Button
  if (!digitalRead(BTN_MODE)) {
    analogMode = !analogMode;
    delay(300);
  }

  manualTheme();

  if (analogMode) {
    drawAnalog(now.hour(), now.minute());
  } else {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print(now.timestamp(DateTime::TIMESTAMP_TIME));
    lcd.setCursor(0,1);
    lcd.print(now.timestamp(DateTime::TIMESTAMP_DATE));
  }

  delay(1000);
}