#define BLYNK_TEMPLATE_ID           "TMPL6sCEZP0m_"
#define BLYNK_TEMPLATE_NAME         "Quickstart Template"
#define BLYNK_AUTH_TOKEN            "A7OYlDmWKKliPzzFmu6PUGFeUw9jWyCX"
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// WiFi
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// DHT22
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// LCD
LiquidCrystal_I2C lcd(0x27,16,2);

// Button
#define BUTTON_PIN 14

// LDR
#define LDR_PIN 34

// LED & Buzzer
#define LEDPIN 2
#define BUZZER_PIN 16
bool ledStateManual = false; // สถานะ LED จาก Blynk

// Blynk Timer
BlynkTimer timer;

// ค่าเก็บสถิติวันนี้
float tempMin = 100;
float tempMax = -100;
float tempSum = 0;
int tempCount = 0;
float tempNow = 0;

// สถานะการรดน้ำ
bool watering = false;
unsigned long wateringStart = 0;
const unsigned long wateringDuration = 5000; // 5 วินาที

// === ฟังก์ชันเตือนด้วย LED/Buzzer และ LCD ===
void alarmCheck(float temp) {
  static bool ledState = false;
  static unsigned long lastToggle = 0;

  if (temp > 30) {
    if (millis() - lastToggle >= 500) {
      ledState = !ledState;
      digitalWrite(LEDPIN, ledState || ledStateManual);
      lastToggle = millis();
    }
    digitalWrite(BUZZER_PIN, HIGH);

    if (!watering) {
      lcd.setCursor(0, 1);
      lcd.print("Watering too high!!");
    }

    // --- ระบบรดน้ำอัตโนมัติถ้า temp > 40 ---
    if (temp > 40 && !watering) {
      watering = true;
      wateringStart = millis();
      lcd.setCursor(0, 1);
      lcd.print("Watering...       ");
      Blynk.virtualWrite(V5, 1); // เปิดปุ่ม Blynk ให้ ON
    }

  } else {
    digitalWrite(LEDPIN, ledStateManual ? HIGH : LOW);
    digitalWrite(BUZZER_PIN, LOW);

    // ปุ่ม Blynk ปิดเองเมื่ออุณหภูมิปกติ ≤40
    if (watering == false) {
      Blynk.virtualWrite(V5, 0); 
    }

    if (!watering) {
      lcd.setCursor(0, 1);
      lcd.print("Temperature good");
    }
  }
}

// === อ่านค่าเซ็นเซอร์และอัปเดตสถิติ ===
void readSensor() {
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int light = analogRead(LDR_PIN);

  if (isnan(temp) || isnan(hum)) {
    Serial.println("❌ DHT error!");
    return;
  }

  if (temp < tempMin) tempMin = temp;
  if (temp > tempMax) tempMax = temp;
  tempSum += temp;
  tempCount++;
  tempNow = temp;
  float tempAvg = tempSum / tempCount;

  if (!watering && temp <= 30) {
    lcd.setCursor(0, 0);
    lcd.print("T:"); lcd.print(tempNow,1); lcd.print("C Now");
    lcd.setCursor(0, 1);
    lcd.print("Min:"); lcd.print(tempMin,0);
    lcd.print(" Max:"); lcd.print(tempMax,0);
  }

  alarmCheck(tempNow);

  Blynk.virtualWrite(V4, digitalRead(LEDPIN)); // LED
  Blynk.virtualWrite(V8, temp);
  Blynk.virtualWrite(V9, hum);
  Blynk.virtualWrite(V10, light);
  Blynk.virtualWrite(V21, light); // LDR
  Serial.print("Temp:"); Serial.print(temp);
  Serial.print(" Hum:"); Serial.print(hum);
  Serial.print(" LDR:"); Serial.println(light);
}

// === ปุ่มกด ESP32 ===
void checkButton() {
  static int lastState = HIGH;
  int state = digitalRead(BUTTON_PIN);
  if (lastState == HIGH && state == LOW) {
    watering = true;
    wateringStart = millis();
    lcd.setCursor(0, 1);
    lcd.print("Watering...       ");
  }
  lastState = state;
}

// === อัปเดตสถานะการรดน้ำ ===
void updateWatering() {
  if (watering && millis() - wateringStart >= wateringDuration) {
    watering = false;
    // ปิดปุ่ม Blynk V5 อัตโนมัติหลังรดน้ำเสร็จ
    Blynk.virtualWrite(V5, 0);
  }
}

// === Blynk LED Handler ===
BLYNK_WRITE(V4) {
  int val = param.asInt();
  digitalWrite(LEDPIN, val);
  ledStateManual = val;
}

// === Blynk Button Handler V5 ===
BLYNK_WRITE(V5) {
  int val = param.asInt();
  if (val == 1) { // กดปุ่ม
    watering = true;
    wateringStart = millis();
    lcd.setCursor(0, 1);
    lcd.print("Watering...       ");
  }
}

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(LEDPIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  readSensor(); // อ่านค่าทันทีตอนเริ่ม

  timer.setInterval(5000L, readSensor);
  timer.setInterval(200L, checkButton);
  timer.setInterval(200L, updateWatering);
}

void loop() {
  Blynk.run();
  timer.run();
}