// Using Adafruit NeoPixel strip for cold box
// Potentiometer for brightness control
//
//LED Strip: https://learn.adafruit.com/adafruit-neopixel-uberguide/the-magic-of-neopixels?view=all
//Button: https://docs.arduino.cc/built-in-examples/digital/Button
//Potentiometer: https://docs.arduino.cc/learn/electronics/potentiometer-basics/
//
//
// Libraries
#include <Adafruit_NeoPixel.h>


// Custon Functions
#define ARRAY_SIZE(array) ((sizeof(array))/(sizeof(array[0])))


//Pins
#define LED_PIN 6       // pin for LED control signal
//#define LED_COUNT 120   // number of LEDs
#define LED_COUNT 240   // number of LEDs
#define POT_PIN  A0     //pin for potentiometer input
#define BUTTON_PIN 2   //input pin for button

// Global Variables
int potVal = -100;       //potentiometer value
int lastPotVal = 0;   //last potentiometer value to prevent continuous overwriting
int colourIndex = 0;  //colour index value
int lastColourIndex = 0;  //last colour index value to prevent continous overwriting

int buttonState = 0;    //button state (HIGH or LOW)

const int delayValue = 50;  //delay for looping in ms



//Initialize LED strip
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);


// Initialising Code
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);         //initialise serial monitor
  Serial.println("===============================");           //start of code
  pinMode(LED_PIN, OUTPUT);   //pin mode
  pinMode(POT_PIN, INPUT);    //pin mode
  pinMode(BUTTON_PIN, INPUT); //pin mode

  strip.begin();           // INITIALIZE NeoPixel strip object (REQUIRED)
  strip.show();            // Turn OFF all pixels ASAP
  //strip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)
  strip.setBrightness(250); 

}



//Continuours code
void loop() {
  // put your main code here, to run repeatedly:
  potVal = analogRead(POT_PIN);           //read potentiometer
  buttonState = digitalRead(BUTTON_PIN);  //read button

  //Serial.print("Potentiometer value: ");
  //Serial.println(potVal);

  //Serial.print("Button Stage: ");
  //Serial.println(buttonState);

  float bright = 255*((float(potVal)+1)/1024);
  //Serial.print("Brighness Value: ");
  //Serial.print(bright);
  //Serial.print("\t Int: ");
  //Serial.println(int(bright));

  // LED Colours set for brightness
  uint32_t white = strip.Color(int(bright),int(bright),int(bright));   //set color
  uint32_t yellow = strip.Color(int(bright),int(bright), int(0));   //set color
  uint32_t blue = strip.Color(int(0),int(0),int(bright));   //set color
  uint32_t lime = strip.Color(int(0),int(bright),int(0));   //set color
  uint32_t red = strip.Color(int(bright),int(0),int(0));   //set color

  //array with colours for looping
  uint32_t colourList[] = {white, yellow, blue, lime, red};


  if (buttonState == HIGH){
    colourIndex ++;
    if (colourIndex > ARRAY_SIZE(colourList)) {colourIndex = 0;}
    delay(500);   //wait 1 s to allow button to unpress
  }
  //Serial.print("Colour Index: ");
  //Serial.print(colourIndex);
  //Serial.print("\tLast Colour Index: ");
  //Serial.println(lastColourIndex);



  //only do colour change if input changed
  if (lastColourIndex != colourIndex){
    strip.fill(colourList[colourIndex]);
    strip.show();
    lastColourIndex = colourIndex;
    Serial.println("Colour Change");
  }

  //only do brighness change if input changed
  if ( abs(lastPotVal-potVal) >5){
    strip.fill(colourList[colourIndex]);
    strip.show();
    lastPotVal = potVal;
    Serial.println("Brighness Change");
  }



  delay(delayValue);    //1s delay between loops

}