/*
Reflex test game with one button and one LED.

1. click button to start program (state 0) (led will stay one for 1 sec indicate you pressed the button)
2. wait three seconds 
3. LED flashes on and off for 250 ms (state 2)
4. you press button as a response (state 3)
    if you press it fast enough (within 1 second), LED blinks quickly a few times
    if you press too slow, LED turns on, then fades
 
Alice Nasto 
10/2013
 */
 
 // set pin numbers:
const int buttonPin = 3;     // the number of the pushbutton pin
const int ledPin =  7;      // the number of the LED pin

int state = 0;
unsigned long gameStart = 0;
unsigned long timePress = 0;
int brightness = 255;    // how bright the LED is
int fadeAmount = 2;    // how many points to fade the LED by
int randNumber = 0; 

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);  

}

void loop(){
 
  boolean buttonState = digitalRead(buttonPin); // reads if high or low
  
  switch(state){
    case 0: 
      if (buttonState == LOW){ // if buton is pressed
        state = 1; // for next time it loops, it will go to 1
        digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
        delay(1000);
        digitalWrite(ledPin, LOW); 
      }
      break; 
    case 1:
           randNumber = random(1,10);
           delay(randNumber*1000);  // have the delay time be a random duration between 1 and 10 s.
           digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
           delay(250);
           digitalWrite(ledPin, LOW); 
           gameStart = millis();
           state = 2; // next time it loops, it will go to 2
       //}
       break;
     case 2:
        if (buttonState == LOW){  // check if button has been pressed
            timePress = (millis() - gameStart); // timePress is the amount of time after the gameStart
          if (timePress < 500){ // if the time that has passed is less than 500 ms, blink! you WIN!
             digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
           delay(250);
           digitalWrite(ledPin, LOW);
           delay(250);
           digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
           delay(250);
           digitalWrite(ledPin, LOW);
           delay(250);
           digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
           delay(250);
           digitalWrite(ledPin, LOW);
           delay(250);
           digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
           delay(250);
           digitalWrite(ledPin, LOW);
           delay(250);
           digitalWrite(ledPin, HIGH); // turn LED on for 250 ms then turn it off
           delay(250);
           digitalWrite(ledPin, LOW);
          
        }else { // have LED turn on then fade. You lose!
            while(brightness > 2){
                analogWrite(ledPin, brightness);   
                // change the brightness for next time through the loop:
                  brightness = brightness - fadeAmount;
              // reverse the direction of the fading at the ends of the fade: 
                if (brightness == 0 || brightness == 255) {
                   fadeAmount = +fadeAmount ; 
                   brightness = 255;
                 }     
                 // wait for 30 milliseconds to see the dimming effect    
                delay(30);  
            }
          }
          state = 0;   // reset game and all the time counting variables

        gameStart = 0; 
        timePress = 0; 
        brightness = 255; 
          digitalWrite(ledPin, LOW); // turn LED off after game
        }
        
      break;
  }
  
  
}