#include <OneWire.h>
#include <DallasTemperature.h>
#include <EEPROM.h>

// EEPROM addresses for configuration
#define EEPROM_SIZE 3       // 3 bytes for storing mode, low, and high thresholds
#define T1_MODE_ADDR 0      // Address for mode
#define T1_LOW_ADDR 1       // Address for lower threshold
#define T1_HIGH_ADDR 2      // Address for upper threshold

// DS18B20 sensor setup
#define SENSOR_PIN 12       // DS18B20 data pin
OneWire oneWire(SENSOR_PIN);
DallasTemperature sensors(&oneWire);

// Output pins
#define RELAY_PIN 14        // Relay control pin
#define BUZZER_PIN 27       // Buzzer control pin

// Stored configuration values
int T1_mode;
int T1_Lvalue;
int T1_Hvalue;

void setup() {
  Serial.begin(115200);

  // Initialize EEPROM
  if (!EEPROM.begin(EEPROM_SIZE)) {
    Serial.println("Failed to initialize EEPROM");
    return;
  }

  // Initialize pins
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  // Read stored configuration from EEPROM
  T1_mode = EEPROM.read(T1_MODE_ADDR);
  T1_Lvalue = EEPROM.read(T1_LOW_ADDR);
  T1_Hvalue = EEPROM.read(T1_HIGH_ADDR);

  // Initialize DS18B20
  sensors.begin();

  // Show startup configuration
  showStoredValues();
  Serial.println("Enter 'T1:mode:low:high' to configure thresholds and mode.");
  Serial.println("Enter 'READ' to display the stored configuration.");
}

void loop() {
  if (Serial.available() > 0) {
    String input = Serial.readStringUntil('\n'); // Read input from Serial Monitor
    input.trim();

    if (input.equalsIgnoreCase("READ")) {
      showStoredValues();
    } else if (input.startsWith("T1:")) {
      parseAndStoreData(input);
    } else {
      Serial.println("Invalid input. Use 'T1:mode:low:high' or 'READ'.");
    }
  }

  // Request temperature from the sensor
  sensors.requestTemperatures();
  float currentTemp = sensors.getTempCByIndex(0);

  if (currentTemp != DEVICE_DISCONNECTED_C) {
    Serial.print("Current Temperature: ");
    Serial.print(currentTemp);
    Serial.println(" °C");

    // Relay and buzzer control based on mode
    switch (T1_mode) {
      case 1: // Relay ON below low threshold, OFF above high threshold
        if (currentTemp <= T1_Lvalue) {
          digitalWrite(RELAY_PIN, HIGH);
        } else if (currentTemp >= T1_Hvalue) {
          digitalWrite(RELAY_PIN, LOW);
        }
        break;

      case 2: // Relay OFF below low threshold, ON above high threshold
        if (currentTemp <= T1_Lvalue) {
          digitalWrite(RELAY_PIN, LOW);
        } else if (currentTemp >= T1_Hvalue) {
          digitalWrite(RELAY_PIN, HIGH);
        }
        break;

      case 3: // Buzzer ON above low threshold; Relay ON above high threshold
        if (currentTemp >= T1_Lvalue) {
          digitalWrite(BUZZER_PIN, HIGH);
        } else {
          digitalWrite(BUZZER_PIN, LOW);
        }
        if (currentTemp >= T1_Hvalue) {
          digitalWrite(RELAY_PIN, HIGH);
        } else {
          digitalWrite(RELAY_PIN, LOW);
        }
        break;

      case 4: // Relay and Buzzer ON below respective thresholds
        if (currentTemp <= T1_Lvalue) {
          digitalWrite(RELAY_PIN, HIGH);
        } else {
          digitalWrite(RELAY_PIN, LOW);
        }
        if (currentTemp <= T1_Hvalue) {
          digitalWrite(BUZZER_PIN, HIGH);
        } else {
          digitalWrite(BUZZER_PIN, LOW);
        }
        break;

      default:
        Serial.println("Invalid mode!");
    }
  } else {
    Serial.println("Sensor not found!");
  }

  delay(1000); // Wait before the next reading
}

// Function to parse input and store values in EEPROM
void parseAndStoreData(String input) {
  int firstColon = input.indexOf(':');
  int secondColon = input.indexOf(':', firstColon + 1);
  int thirdColon = input.indexOf(':', secondColon + 1);

  if (firstColon != -1 && secondColon != -1 && thirdColon != -1) {
    String modeStr = input.substring(firstColon + 1, secondColon);
    String lowStr = input.substring(secondColon + 1, thirdColon);
    String highStr = input.substring(thirdColon + 1);

    int mode = modeStr.toInt();
    int low = lowStr.toInt();
    int high = highStr.toInt();

    if (mode >= 0 && mode <= 255 && low >= 0 && low <= 255 && high >= 0 && high <= 255) {
      if (EEPROM.read(T1_MODE_ADDR) != mode) {
        EEPROM.write(T1_MODE_ADDR, mode);
        T1_mode = mode;
      }
      if (EEPROM.read(T1_LOW_ADDR) != low) {
        EEPROM.write(T1_LOW_ADDR, low);
        T1_Lvalue = low;
      }
      if (EEPROM.read(T1_HIGH_ADDR) != high) {
        EEPROM.write(T1_HIGH_ADDR, high);
        T1_Hvalue = high;
      }
      EEPROM.commit();

      Serial.println("Configuration saved successfully.");
      showStoredValues();
    } else {
      Serial.println("Values must be between 0 and 255.");
    }
  } else {
    Serial.println("Invalid format! Use 'T1:mode:low:high'.");
  }
}

// Function to display stored values
void showStoredValues() {
  Serial.println("Stored Configuration:");
  Serial.print("Mode: ");
  Serial.println(T1_mode);
  Serial.print("Lower Threshold: ");
  Serial.println(T1_Lvalue);
  Serial.print("Upper Threshold: ");
  Serial.println(T1_Hvalue);
}