#include <Wire.h>

// pwm pins for red, green and blue
int rled = 9;
int gled = 10;
int bled = 11;
char currentColor = 'r';

/*
TODO: support hex values for rgb
int rledval = 255;
int gledval = 255;
int bledval = 255;
*/
void setup()
{
  // set up pwm pins for RGB LED
  pinMode(rled, OUTPUT);  
  pinMode(bled, OUTPUT);  
  pinMode(gled, OUTPUT);  
  
  // join i2c bus with address #2 - change for each cell
  Wire.begin(2);                
  Wire.onReceive(receiveEvent); 
}

void loop()
{
  delay(100);
}

/*
 * operations are:
 * o 0|1 off/on
 * c <color> set colour
 * l 0|1 lock
 */
 
void receiveEvent(int howMany)
{
  char op = Wire.read(); // read op
  int arg = Wire.read();    // read argument(s)
  switch(op) {
    case 'o': rgbOn(arg); break;
    case 'c': rgbSetColor(arg); break;
    case 'l': doorLock(arg); break;
    default: break;
  }
}

void doorLock(char lock){
  if (lock == 0){
    // control solenoid to unlock door
  } else {
    // control solenoid to lock door
  }
}
void rgbSetColor(char color){
  currentColor = color;
  digitalWrite(rled, LOW);
  digitalWrite(gled, LOW);
  digitalWrite(bled, LOW);
  switch(color){
    case 'r': digitalWrite(rled, HIGH); break;
    case 'g': digitalWrite(gled, HIGH); break;
    case 'b': digitalWrite(bled, HIGH); break;
    default: break;
  }
}

void rgbOn(char on) {
  if (on == 0){
    digitalWrite(rled, LOW);
    digitalWrite(gled, LOW);
    digitalWrite(bled, LOW);
  } else {
    rgbSetColor(currentColor);
  }
}