#include <IRremote.h>

//declaring IR-Remote codes
const unsigned long value_0 = 2540240640;
const unsigned long value_1 = 3476094720;
const unsigned long value_2 = 3877175040;
const unsigned long value_3 = 2239430400;
const unsigned long value_4 = 4010868480;
const unsigned long value_5 = 3342401280;
const unsigned long value_6 = 2774204160;
const unsigned long value_7 = 3175284480;
const unsigned long value_8 = 3041591040;
const unsigned long value_9 = 2907897600;
const unsigned long value_pause = 1470693120;
const unsigned long value_plus = 4244832000;
const unsigned long value_minus = 1738080000;

//declaring Pins
const int remote_input = 12;

//LED Pins for each color [LED_PIN_1, LED_PIN_2, ...]
int redLedPins[] = {8, 9, 10};
const int numOfRedLeds = sizeof(redLedPins) / sizeof(redLedPins[0]);
int greenLedPins[] = {5, 6, 7};
const int numOfGreenLeds = sizeof(greenLedPins) / sizeof(greenLedPins[0]);
int blueLedPins[] = {2, 3, 4};
const int numOfBlueLeds = sizeof(blueLedPins) / sizeof(blueLedPins[0]);
int activePins[] = {}; //stores all active pins
int numOfActiveLeds() {
  /*
  returns the amount of active Pins
  */
  return (sizeof(activePins) / sizeof(activePins[0]));
}

//declaring default mode of leds
bool redEnabled = false;
bool greenEnabled = false;
bool blueEnabled = false;

//other globals for the program
int modeStep = 0; //stores the current step in the lighting mode

//creating object for IR-Sensor
IRrecv irrecv(remote_input);

void activateRedLeds() {
  /*
  activates the red LEDs
  When the red LEDs are already active nothing will happen
  */
  if (redEnabled) {
    return;
  }

  redEnabled = true;
  for (int i = 0; i < numOfRedLeds; i++) {
    activePins[numOfActiveLeds() + i] = redLedPins[i];
  }
}

void activateGreenLeds() {
  /*
  activates the green LEDs
  When the green LEDs are already active nothing will happen
  */
  if (greenEnabled) {
    return;
  }

  greenEnabled = true;
  for (int i = 0; i < numOfGreenLeds; i++) {
    activePins[numOfActiveLeds() + i] = greenLedPins[i];
  }
}

void activateBlueLeds() {
  /*
  activates the blue LEDs
  When the blue LEDs are already active nothing will happen
  */
  if (blueEnabled) {
    return;
  }

  blueEnabled = true;
  for (int i = 0; i < numOfBlueLeds; i++) {
    activePins[numOfActiveLeds() + i] = blueLedPins[i];
  }
}

void seq_leds(int* LED_PINS, int numOfLeds, int current_step) {
  //loops through all given LED_PINS while lighting them up,
  //wait for LedDelay in ms and turn them off
  digitalWrite(LED_PINS[current_step], HIGH);
  delay(1000);
  digitalWrite(LED_PINS[current_step], LOW);

  //error preventing
  if (current_step + 1 >= numOfLeds) { //when the last LED was reached
    modeStep = 0;
    return;
  }

  modeStep += 1;
}

void static_leds(int* LED_PINS, int numOfLeds, int current_step) {
  //lights all leds up
  digitalWrite(LED_PINS[current_step], HIGH);
  //error preventing
  if (current_step + 1 >= numOfLeds) { //when the last LED was reached
    modeStep = 0;
  }

  modeStep += 1;
}

void reset_mode(int* LED_PINS, int numOfLeds) {
  //
  //turns all leds off to start the next lighting mode
  //
  Serial.println("beginn to turn all leds off");
  Serial.println(numOfLeds);
  for (int i = 0; i < numOfLeds; i++) {
    int pin = LED_PINS[i];
    digitalWrite(pin, LOW);
  }
  modeStep = 0;
}

void (*pLedModeFunc)(int*, int, int) = static_leds; //points to a function that determins the mode of the LEDs

bool checkIrInput() {
  /*
    checks if the IR-receiver detected an IR-input.
    When an input is detected checks which button is pressed
    and changes the led-lighting mode arccodingly

    returns true when an IrInput was detected and false when there was
    no Input detected
  */

  //when the IR-receiver detects an input
  if (irrecv.decode()) {
    unsigned long remote_data = irrecv.decodedIRData.decodedRawData;
    Serial.println(remote_data);

    //checks wjich button got pressed on the remote
    switch (remote_data) {
      case value_1: // switch red leds
        activateRedLeds();
        break;
      case value_2: // switch green leds
        activateGreenLeds();
        break;
      case value_3: // switch blue leds
        activateBlueLeds();
        break;

      case value_8:
        pLedModeFunc = seq_leds;
        Serial.println("Mode changed to seq_leds");
        break;
      case value_9:
        pLedModeFunc = static_leds;
        Serial.println("Mode changed to static_leds");
        break;
    }
    
    irrecv.resume();
    return true;
  }
  return false;
}

void setup() {
  Serial.begin(9600); //Serial for debug printing
  irrecv.enableIRIn(); //enabling the IR-receiver

  //setup redLedPins
  for (int i = 0; i < numOfRedLeds; i++) {
    pinMode(redLedPins[i], OUTPUT);
  }
  for (int i = 0; i < numOfBlueLeds; i++) {
    pinMode(blueLedPins[i], OUTPUT);
  }
  for (int i = 0; i < numOfGreenLeds; i++) {
    pinMode(greenLedPins[i], OUTPUT);
  }
}

void loop() {
  if (checkIrInput()) {
    reset_mode(activePins, numOfActiveLeds());
    modeStep = 0;
  }
  pLedModeFunc(activePins, numOfActiveLeds(), modeStep);
}