#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo feeder;

// Pins
int turbidityPin = 34;
int greenLED = 18;
int yellowLED = 19;
int redLED = 23;
int buzzer = 5;
int servoPin = 4;

// Simulated temperature
float temperature = 26.0;

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

  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(buzzer, OUTPUT);

  feeder.attach(servoPin);

  lcd.init();
  lcd.backlight();

  randomSeed(analogRead(0));
}

void loop() {
  int turbidity = analogRead(turbidityPin);

  // Simulate temperature variation
  temperature = random(240, 300) / 10.0;

  // Reset outputs
  digitalWrite(greenLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(redLED, LOW);
  digitalWrite(buzzer, LOW);

  // Logic
  if (turbidity > 2500 && temperature >= 24 && temperature <= 28) {
    digitalWrite(greenLED, HIGH);
  } 
  else if (turbidity > 1500) {
    digitalWrite(yellowLED, HIGH);
  } 
  else {
    digitalWrite(redLED, HIGH);
    digitalWrite(buzzer, HIGH);
  }

  // Display
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.print(temperature);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Turb:");
  lcd.print(turbidity);

  // Auto Feeding (every ~10 sec for demo)
  static unsigned long lastFeed = 0;
  if (millis() - lastFeed > 10000) {
    feedFish();
    lastFeed = millis();
  }

  delay(1000);
}

void feedFish() {
  Serial.println("Feeding Fish...");
  feeder.write(90);
  delay(1000);
  feeder.write(0);
}