#include <Wire.h>
#include <SPI.h>
#include <RTClib.h>
#include <Adafruit_GFX.h>    // Core graphics library
#include <Adafruit_ST7735.h> // Hardware-specific library


RTC_DS3231 RTC;

//COLOR DEFINITIONS
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFE0
#define WHITE 0xFFFF
#define GREY 0x8410

// ARRAY TO REPLACE SINGLE DIGITS WITH LEADING ZEROES
char* leadingZero[]={
  "00", "01", "02", "03", "04", "05", "06", "07", "08", "09"};

// VARIABLES TO HOLD COLOR VALUES
int redValue = 0;
int grnValue = 0;
int bluValue = 0;

//TFT SHIELD STUFF
//Use these pins for the shield!
#define sclk 13
#define mosi 11
#define cs   10
#define dc   8
#define rst  0  // you can also connect this to the Arduino reset


// MORE SHIELD STUFF
#if defined(__SAM3X8E__)
#undef __FlashStringHelper::F(string_literal)
#define F(string_literal) string_literal
#endif
int position = 0;
int dim = 255;
int bright = 0;
long previousMillis = 0;
int interval = 1000;

//THIS LINE MAY VARY - SEE EXAMPLE SKETCHES FROM SHIELD
Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, rst);

//DEFINITIONS FOR THE JOYSTICK
#define Neutral 0
#define Press 1
#define Up 2
#define Down 3
#define Right 4
#define Left 5


void setup() {
    Wire.begin();
    RTC.begin();
      if (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }
  DateTime now = RTC.now();

  // MANAUALLY ENTER TIME WITH THIS LINE, COMMENT OUT IF USING RTC
  //setTime(16, 56, 0, 16, 9, 2014);

  // MORE TFT STUFF - SEE EXAMPLE SKETCHES
  tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab

  //ROTATES DISPLAY 90 DEGREES FOR LANDSCAPE VIEW
  tft.setRotation(3);

  // analogWrite(5, 255);  //jump "LITE" and Digital pin 5 to dim

  // BLANKS OUT THE SCREEN AND DRAWS THE BLACK BAR
  tft.fillScreen(WHITE);
  tft.fillRect(0, 50, 160, 30, BLACK);
}

void loop(){
  //PERFORMS A TASK EVERY SECOND WITHOUT USING DELAY
  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > interval) {
    previousMillis = currentMillis;

    // UPDATES THE SCREEN
    drawTime();

  }
}


void drawTime(){

  // SETS THE VARIABLE t TO THE CURRENT TIME - PREVENTS OVERLAPPING
  DateTime now = RTC.now();

  //MAPS THE TIME TO CORRESPOND TO COLOR VALUES
  // CONVERTS 24 HOURS TO 0 - 255 STEPS, ETC.
  redValue = map(now.hour(), 0, 23, 0, 255);
  grnValue = map(now.minute(), 0, 59, 0, 255);
  bluValue = map(now.second(), 0, 59, 0, 255);

  //SETS THE TEXT COLOR AND TEXT BACKGROUND COLOR
  //USES THE GFX FUNCTION TO CONVERT THREE INTEGER VALUES TO A HEX COLOR VALUE
  // REPLACE TFT.COLOR565 WITH WHITE OR ANOTHER COLOR IF YOU WANT A STATIC TIME COLOR
  tft.setTextColor((tft.Color565(redValue, grnValue, bluValue)), BLACK);
  // YOU HAVE TO SET THE TEXT SIZE BEFORE YOU START PRINTING
  tft.setTextSize(3);

  //DRAWS RECTANGLES ABOVE AND BELOW THE BLACK BAR IN THE SAME COLOR
  tft.fillRect(0, 0, 160, 50, (tft.Color565(redValue, grnValue, bluValue)));
  tft.fillRect(0, 80, 160, 50, (tft.Color565(redValue, grnValue, bluValue)));

  // LINES UP THE CURSOR AND DRAWS THE HOUR
  // IF THE HOUR IS LESS THAN 10 IT CALLS A VALUE FROM THE LEADING ZERO ARRAY
  tft.setCursor(13, 54);
  if (now.hour() >= 0 && now.hour() < 10) {
    tft.print(leadingZero[now.hour()]);
  }
  else{
    tft.print(now.hour());
  }
  // INSERTS THE FIRST DIVIDING COLON
  tft.setCursor(48, 54);
  tft.print(":");

  // MOVES THE CURSOR AND DRAWS THE MINUTES, LEADING ZERO, ETC
  tft.setCursor(65, 54);
  if (now.minute() >= 0 && now.minute() < 10){
    tft.print(leadingZero[now.minute()]);
  }
  else{
    tft.print(now.minute());
  }

  // INSERTS THE SECOND COLON
  tft.setCursor(99, 54);
  tft.print(":");

  // MOVES THE CURSOR AND DRAWS THE SECONDS, LEADING ZERO, ETC
  tft.setCursor(115, 54);
  if (now.second() >= 0 && now.second() <10){
    tft.print(leadingZero[now.second()]);
  }
  else{
    tft.print(now.second());
  }

}

// Check the joystick position
int CheckJoystick()
{
  int joystickState = analogRead(3);

  if (joystickState < 50) return Left;
  if (joystickState < 150) return Down;
  if (joystickState < 250) return Press;
  if (joystickState < 500) return Right;
  if (joystickState < 650) return Up;
  return Neutral;
}