/* 25/10/2021
 *  alarmSystemv1
 * 
 *  Put the led/buzzer and PIR
 *  
 *  
 *  
 * 
 *  pins
 *  11 buzzer
 *  12 pir
 *  13 led
 */
const int buzzerPin = 11;
const int pirPin = 12;
const int ledPin = 13;

int soundAlarm = 0;//0 alarm is off, 1 alarm is on
int alarmState;//used to flash the leds/tone
unsigned long alarmTimer;
int alarmDelay = 1000;
//alarm sounding function
void myAlarm(){
  if(soundAlarm > 0){//sound alarm
    if(millis() > alarmTimer){
      alarmTimer = millis() + alarmDelay;
      if(alarmState < 1){
        alarmState = 1;
        digitalWrite(ledPin,HIGH); 
        tone(buzzerPin,500);
      }else{
        alarmState = 0;
        digitalWrite(ledPin,LOW); 
        tone(buzzerPin,1000);   
      }
    }
  }
}

int soundWarn = 0;//0 warn is off, 1 warn is on
int warnState;//used to flash the leds/tone
unsigned long warnTimer;
//warning sounding function
void myWarn(){
  if(soundWarn > 0){//sound alarm
    if(millis() > warnTimer){
      if(warnState < 1){
        warnState = 1;
        digitalWrite(ledPin,HIGH); 
        tone(buzzerPin,500);
        warnTimer = millis() + 100;   
      }else{
        warnState = 0; 
        digitalWrite(ledPin,LOW); 
        noTone(buzzerPin);
        warnTimer = millis() + 500;  
      }
    }    
  }
}


int myMovement = 0;
unsigned long pirTimer;
int pirScanDelay = 100;//time in milliseconds until the next pir scan takes place


//pir
//function is now controlled by a millis() timer
void pirScan(){
  if(millis() > pirTimer){
    pirTimer = millis() + pirScanDelay;
    myMovement = digitalRead(pirPin);
    //Serial.println(myMovement); 
     
  }
}

//this function controls what is happening
unsigned long controlTimer;
int controlState; //0 = no movement, 1 = movement prompt keypad, 2 = alarm sound, 3 = disarmed
void alarmControl(){
  if(myMovement > 0){//movement detected
    Serial.print("controlState: ");
    Serial.println(controlState);
    switch(controlState){
          case 0://if no movement this is a new moment detected...warn to enter code
            if(millis() > controlTimer){
              controlState = 1;
              controlTimer = millis() + 5000;//5 seconds to enter a code
              soundWarn = 1;
              soundAlarm = 0;
            } 
            break;
          case 1://ongoing movement... no code entered
            if(millis() > controlTimer){
              controlTimer = millis() + 20000;//alarm to sound 20 seconds
              controlState = 2;
              soundWarn = 0; 
              soundAlarm = 1; 
            }
            break;
          case 2://alarm is sounding
            if(millis() > controlTimer){// if the alarm has been sounding for 20 secs...give neigbours a break
              controlTimer = millis() + 10000;//10 second break in the noise
              controlState = 0;//start again...could be set to 1 to prompt keycode  
            }
            break;
          default:
            Serial.println("Error...invalid state");
            break;
    }
  }else{//turn any sounds or leds off as no movement
    digitalWrite(ledPin,LOW); 
    noTone(buzzerPin);
    soundWarn = 0; //warning off
    soundAlarm = 0; //alarm off
    controlState = 0;  
  }
}

void setup() {
  Serial.begin(9600);
  Serial.println("alarmSystemv1...");
  pinMode(buzzerPin,OUTPUT);
  pinMode(ledPin,OUTPUT);
  pinMode(pirPin,INPUT);

}

void loop() {
  pirScan();//checks for movement
  alarmControl();//functino controls the system state
  myAlarm();//sets alarm sound off
  myWarn();//sets passcode warning sound
  
}