#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  //define I2C address 0x27, 16 column and 2 rows

float flamelevel = 0; // mapped and inverted % of sensor range
#define greenLED 2 // fire okay or firing
#define redLED 7 // warning or flashing alert

// empirically relate flame % to actual fire condition (TBD)
const int minSurvive = 15; // minimum level for idle, below is outfire
const int idleLow = 20; // lowest reading for healthy idle
const int idleTarget = 30; // target reading for resting idle
const int firingLow = 70; // lowest reading for actively firing
const int firingHigh = 90; // reading for full firing



void setup() {
  lcd.init();
  lcd.clear();
  lcd.backlight();
  Serial.begin(9600);

  pinMode(greenLED, OUTPUT); // set green pin led as output
  digitalWrite(greenLED, LOW); // turn off green led

  pinMode(redLED, OUTPUT); // set red led pin as output
  digitalWrite(redLED, LOW); // turn off red led
}

void loop() {
  float analogValue = analogRead(A0);
  Serial.print("Sensor RAW: ");
  Serial.println(analogValue, 0);
  flamelevel = map(analogValue, 0, 1024, 100, 0);
  Serial.print(flamelevel, 0);
  Serial.println("%");

  // disabling the lcd commands makes serial print work
  lcd.setCursor(0, 0);
  lcd.print(F("Flame: "));

  if (flamelevel >= firingHigh) { // stoker is fully firing
    lcd.print(" Fire");
    digitalWrite(greenLED, HIGH); // turn on green led
    digitalWrite(redLED, LOW); // turn off red led
    delay(300);
    digitalWrite(greenLED, LOW); // turn off green led for flash
  }

  


  if ((flamelevel <= idleLow) && (flamelevel >= minSurvive) ) {  // low fire
    lcd.print("No fire  ");
    digitalWrite(greenLED, LOW); // turn on green led
    digitalWrite(redLED, HIGH); // turn off red led
    // trigger stoker run timer = 2 mins?
  }

  lcd.setCursor(0, 1);
  lcd.print("   Level: ");
  lcd.print(flamelevel, 0);
  lcd.print("%    ");

  delay(200);
}