// Forum: https://forum.arduino.cc/t/rgbw-pattern-problem/1247866
// This Wokwi project: https://wokwi.com/projects/395245481110779905
// Previous Wokwi project: https://wokwi.com/projects/395236442837506049
//
// Version 1: 15 April 2024
// Version 2: 15 April 2024
//   changed > to >= in millis timer.
//   table is now called: colorCombinationTable
//   colorMode -> colorIndex
//   added that the EEPROM is used when the red reset button is pressed.
//   
// Warning: It is now specifically for a Uno board.
//          The EEPROM does not keep its contents in Wokwi.

// -------------------------------------------
// Glue for the Uno
#define PA13 13
#define PA4  4
#define PA5  9
#define PA6  6
#define PA7  5
#define PB1  3
// -------------------------------------------

#include <EEPROM.h>
#include <Bounce2.h>

const int RGBWpin[4] = {PA6, PA5, PA7, PB1};
const int ledPin = PA13;
const int buttonPin = PA4;

unsigned long durationNewColor = 5000UL;

unsigned long previousMillisTimeout;
unsigned long durationBackToNormal = 15000UL;

bool setColorMode = false;
int colorIndex;
const int defaultColorIndex = 1;

Bounce button = Bounce();

// Eleven different led values, RGBW
const int colorCombinationTable[11][4] =
{
  {   0,   0,   0,   0},   // off, not used
  { 255,   0,   0,   0},   // color 1
  {   0, 255,   0,   0},   // color 2
  {   0,   0, 255,   0},   // color 3
  {   0,   0,   0, 255},   // color 4
  { 150, 150,   0,   0},   // color 5
  { 150,   0, 150,   0},   // color 6
  {   0, 150, 150,   0},   // color 7
  { 100, 255,  50,   0},   // color 8
  {  20, 120, 200,   0},   // color 9
  { 180,  60,  30,   0},   // color 10
};


void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.println("---- RGBW pattern sketch ----");

  pinMode(ledPin, OUTPUT);

  colorIndex = EEPROM.read(0);
  Serial.print("colorIndex read = ");
  Serial.println(colorIndex);

  if(colorIndex < 1 or colorIndex > 10)
  {
    // It is not valid, fall back to default value.
    colorIndex = defaultColorIndex;
    Serial.print("colorIndex changed to ");
    Serial.println(colorIndex);
  }

  button.attach(buttonPin, INPUT_PULLUP);
  button.interval(20);   // debounce interval in ms

  // Set the values
  setRGBW(colorIndex);
}

void loop() 
{
  button.update();     // keep the Bounce2 library going

  if(!setColorMode)   
  {
    // Is the button pressed for a long time ?
    if(button.read() == LOW && button.currentDuration() >= durationNewColor) 
    {
      // Switch to the mode to set the color.
      digitalWrite(ledPin,HIGH);
      setColorMode = true;
      previousMillisTimeout = millis();
    }
  }
  else
  {
    // Set a new color mode
    if(button.fell())
    {
      // The button was pressed, next color
      colorIndex++;
      if(colorIndex > 10) 
        colorIndex = 1;

      EEPROM.write(0, colorIndex);
      Serial.print("(saved:");
      Serial.print(colorIndex);
      Serial.print("),");
   
      // Update the new value to the leds
      setRGBW(colorIndex);

      // Remember the time that a button was last pressed.
      previousMillisTimeout = millis();
    }
    else
    {
      // No button pressed for a very long time ?
      // Then go back to normal.
      if(millis() - previousMillisTimeout >= durationBackToNormal)
      {
        digitalWrite(ledPin,LOW);
        setColorMode = false;
      }
    }
  }
}

void setRGBW(int value)
{
  Serial.print(value);
  Serial.print(",");

  for(int i = 0; i < 4; i++)
  {
    analogWrite(RGBWpin[i], colorCombinationTable[value][i]);
  }
}