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

// Pin definitions
#define ONE_WIRE_BUS 4    // DS18B20 Data pin
#define SOIL_PIN 34       // Potentiometer SIG pin for soil moisture
#define GREEN_LED 5       // Green LED pin
#define YELLOW_LED 18     // Yellow LED pin (temperature warning)
#define RED_LED 19        // Red LED pin (soil warning/dry)

 // Soil moisture thresholds
#define DRY_THRESHOLD 3000
#define WET_THRESHOLD 1500
#define SOIL_WARNING_THRESHOLD 2000
#define TEMP_WARNING_THRESHOLD 45.0

// Setup a oneWire instance
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// Blink state variables
bool tempBlinkState = false;
bool soilBlinkState = false;
unsigned long lastBlinkTime = 0;
const long blinkInterval = 500;  // Blink every 500ms (0.5s)

void setup() {
  Serial.begin(115200);
  sensors.begin();
  
  // Initialize LED pins
  pinMode(GREEN_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(YELLOW_LED, LOW);
  digitalWrite(RED_LED, LOW);

  Serial.println("Setup complete. Starting sensor readings...");
}

void loop() {
  // Read sensors
  int soilValue = analogRead(SOIL_PIN);  // Reads SIG pin (0–4095)
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);  // Get temperature from DS18B20

  // Debugging output
  Serial.print("Raw Soil Value: ");
  Serial.println(soilValue);
  Serial.print("Raw Temperature: ");
  Serial.println(temperature);

  // Check sensor readings
  if (soilValue < 0 || soilValue > 4095) {
    Serial.println("Error: Invalid soil moisture reading!");
    soilValue = 0;  // Default to 0 if invalid
  }
  if (temperature == DEVICE_DISCONNECTED_C || temperature < -55 || temperature > 125) {
    Serial.println("Error: DS18B20 not detected or out of range!");
    temperature = 25.0;  // Default to 25°C if invalid
  }

  // Print to Serial Monitor
  Serial.print("Soil Moisture: ");
  Serial.print(soilValue);
  Serial.print(" | Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");

  // Get current time
  unsigned long currentTime = millis();

  // Control LEDs based on conditions
  if (soilValue <= WET_THRESHOLD) {  // Wet
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(RED_LED, LOW);
  } else if (soilValue > WET_THRESHOLD && soilValue <= DRY_THRESHOLD) {  // Normal
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(RED_LED, LOW);
  } else {  // Dry (> 3000)
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(RED_LED, HIGH);  // Solid ON for dry
  }

  // Temperature warning blink (> 45°C)
  if (temperature > TEMP_WARNING_THRESHOLD) {
    if (currentTime - lastBlinkTime >= blinkInterval) {
      tempBlinkState = !tempBlinkState;
      digitalWrite(YELLOW_LED, tempBlinkState ? HIGH : LOW);
      lastBlinkTime = currentTime;
    }
  } else {
    digitalWrite(YELLOW_LED, LOW);  // Off if temp ≤ 45°C
  }

  // Soil moisture warning blink (> 2000) only if not dry
  if (soilValue > SOIL_WARNING_THRESHOLD && soilValue <= DRY_THRESHOLD) {
    if (currentTime - lastBlinkTime >= blinkInterval) {
      soilBlinkState = !soilBlinkState;
      digitalWrite(RED_LED, soilBlinkState ? HIGH : LOW);  // Blinks if > 2000 but ≤ 3000
      lastBlinkTime = currentTime;
    }
  } else if (soilValue <= SOIL_WARNING_THRESHOLD) {
    digitalWrite(RED_LED, LOW);  // Ensure off if ≤ 2000
  }

  delay(100);  // Short delay for smooth blinking
}