#define FLAST_FAST 1
#define PULSE 2
#define DIMDOWNUP 3

const byte ledPin = 10;
byte state = 0;
byte flashCount = 0;
unsigned long OldTime, downTime, upTime, waitTime;
unsigned long shortPeriod = 450; //fast flash
unsigned long longPeriod = 5000; // pulse

void setup() {
  // put your setup code here, to run once:
  state = random(1, 100)%4;
  pinMode(10,OUTPUT);
  Serial.begin(115200);
}

void loop() {
  switch(state){
    case FLAST_FAST:
      if (flashCount == 0){
        OldTime = millis();
        flashCount++;
      }
      else if (flashCount == 6){
        state = random(1, 100)%4;
        flashCount = 0;
        digitalWrite(ledPin, LOW);
      }
      else if (OldTime - millis() >= shortPeriod) {
        OldTime = millis();
        digitalWrite(ledPin, !digitalRead(ledPin));
        flashCount++;
      }
    break;

    case PULSE:
      if (flashCount == 0){
        OldTime = millis();
        flashCount++;
      }
      else if (flashCount == 6){
        state = random(1, 100)%4;
        flashCount = 0;
        digitalWrite(ledPin, LOW);
      }
      else if (OldTime - millis() >= longPeriod) {
        OldTime = millis();
        digitalWrite(ledPin, HIGH);
        delay(shortPeriod);
        digitalWrite(ledPin, LOW);
        flashCount++;
      }
    break;

    case DIMDOWNUP:
      if (flashCount == 0){
        OldTime = millis();
        flashCount++;
        downTime = random(1000,5000);
        upTime  = random(1000,5000);
        waitTime = 0;
      }
      else if (OldTime - millis() >= shortPeriod) {
        OldTime = millis();
        waitTime +=shortPeriod;

        if(flashCount==1 && waitTime > upTime){
          flashCount++;
          waitTime = 0;
        }
        else if (waitTime > downTime){
          state = random(1, 100)%4;
          flashCount = 0;
          waitTime = 0;
          digitalWrite(ledPin, LOW);
          break;
        }

        if(flashCount==1){
          analogWrite(ledPin, waitTime%255);
        }
        else{
          analogWrite(ledPin, waitTime%255);
        }
      }
    break; 
    default:
      state = random(1, 100)%4;
    break;
  }

  //Serial.println(state);
  delay(100);
}