/**
   Arduino Uno Controller
   Copyright (C) 2023, Tharana Madhawa.
*/

#include <LiquidCrystal.h>
#include <Keypad.h>

const float BETA = 3950; // should match the Beta Coefficient of the thermistor

/* Display */
LiquidCrystal lcd(13, 12, 11, 9, 8, 7);

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 3;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'C', '0', 'S'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

void showSpalshScreen() {
  lcd.print("Welcome to test");
  lcd.setCursor(3, 1);
  String message = "Controller";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(50);
  }
  delay(2000);
}

void updateCursor() {
  if (millis() / 250 % 2 == 0 ) {
    lcd.cursor();
  } else {
    lcd.noCursor();
  }
}

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);

  showSpalshScreen();
  lcd.clear();
  lcd.cursor();
  lcd.setCursor(0, 0);

  pinMode (10,OUTPUT);
}

String current = "";
int led1=10;

void processInput(char key) {
  if (key != 'S' && key != 'C'){
    lcd.print(key);
    if (current == "") {
      current = String(key);
    } else {
      current += String(key);
    }
  } else if (key == 'C') {
    current = "";
    lcd.clear();
    lcd.cursor();
    lcd.setCursor(0, 0);
  } else {
    int limit = current.toInt();
    if (heatDetector() < 30) {
      execute (limit);
    } else {
      Serial.print("Too hot!");
      //exit(0);
    }
  }
}

void loop() {
  updateCursor();

  char key = keypad.getKey();

  if (key != NO_KEY) {
    //if (heatDetector < 30) {
      processInput(key);
    //} else {
    //  exit(0);
    //}
  }

}

void execute (int limit) {
  for (int i=0; i<limit; i=i+1){
    digitalWrite (led1,HIGH);
    delay(100);
    digitalWrite (led1,LOW);
    delay(1000);
  }
}

float heatDetector () {
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
 // delay(1000);
 return celsius;
}