#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "PubSubClient.h"
#include "DHTesp.h"

const char *MQTTServer = "broker.hivemq.com";
const char *MQTT_Topic = "data1";//nhietdo,doam
const char *MQTT_TopicTB = "display1";//Canhbao
const char *MQTT_Topic2 = "avgTemp";//NhietDoTB
const char *MQTT_TopicLight = "lightsensor"; // anhSang
const char *MQTT_TopicMotion = "motionsensor";
const char *MQTT_TopicLed = "batden21022024";

#define I2C_ADDR 0x27
#define LCD_COLUMNS 20
#define LCD_LINES 4
#define led 4//chan led nd,da
#define led1 19 // chan led hc-rs04
#define led2 16 //led as
#define led3 25 // led mua
#define PIR_PIN 35 // Chân cho cảm biến mua

#define TRIGGER_PIN 5 // chan hcrs04
#define ECHO_PIN 18 // chan hcrs04
#define LIGHT_SENSOR_PIN 32 // Chân analog để kết nối với cảm biến độ sáng

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

WiFiClient espClient;
PubSubClient client(espClient);

const char *MQTT_ID = "0a55c64b-42d5-4cbd-830e-4663cf2ff5cd";
int Port = 1883;

const int DHT_PIN = 15;//chan dht22
DHTesp dhtSensor;

const int numReadings = 3;
float temperatures[numReadings];
int readIndex = 0;
float total = 0;
float average = 0;
int numValidReadings = 0;
int per_light = 0;

void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected, IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      client.subscribe(MQTT_TopicLed);
    
      Serial.println("MQTT connected");
    } else {
      Serial.print("MQTT connection failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }

  }
}
bool ledStateFromTemperature = LOW; //
bool mqttMessageReceived = false; //
bool ledStateFromTemperature1 = LOW; //

bool ledStateFromTemperature2 = LOW; //

void callback(char *topic, byte *message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String stMessage;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
  mqttMessageReceived = true; 
  if (stMessage == "on") {
    ledStateFromTemperature = HIGH;
  }
  else if (stMessage == "off") {
    ledStateFromTemperature = LOW;
  }
  else if (stMessage == "on1") {
    ledStateFromTemperature1 = HIGH;
  }
  else if (stMessage == "off1") {
    ledStateFromTemperature1 = LOW;
  }
  else if (stMessage == "on2") {
    ledStateFromTemperature2 = HIGH;
  }
  else if (stMessage == "off2") {
    ledStateFromTemperature2 = LOW;
  }
}




void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);

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

  pinMode(led, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LIGHT_SENSOR_PIN, INPUT);
  pinMode(PIR_PIN, INPUT); 

  // Đăng ký để nhận dữ liệu từ topic mới
  client.subscribe(MQTT_TopicLight);

  for (int thisReading = 0; thisReading < numReadings; thisReading++) {
    temperatures[thisReading] = NAN;
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();
int motionValue = digitalRead(PIR_PIN); // Đọc giá trị từ cảm biến mua
String motionSensorMessage;
Serial.print("ledStateFromTemperature: ");
Serial.println(ledStateFromTemperature);

if (motionValue == 1) {
  motionSensorMessage = "Có mưa ";
  digitalWrite(led3, HIGH);
} else {
  motionSensorMessage = "Không mưa";
  digitalWrite(led3, LOW);
  

}

client.publish(MQTT_TopicMotion, motionSensorMessage.c_str()); // Gửi giá trị qua MQTT
Serial.print("Motion Sensor Value: ");
Serial.println(motionSensorMessage);

  float humidity = dhtSensor.getHumidity();// nhiet do
  float temperature = dhtSensor.getTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  if (!isnan(temperatures[readIndex])) {
    numValidReadings--;
  }

  temperatures[readIndex] = temperature;
  if (!isnan(temperature)) {
    numValidReadings++;
  }

  readIndex = (readIndex + 1) % numReadings;

  float total = 0;
  for (int i = 0; i < numReadings; i++) {
    if (!isnan(temperatures[i])) {
      total += temperatures[i];
    }
  }

  float average = numValidReadings > 0 ? total / numValidReadings : NAN;

  if (!isnan(average)) {
    String message = String(average);
    Serial.println(message);
    client.publish(MQTT_Topic2, message.c_str());
  }

  int light_value = analogRead(LIGHT_SENSOR_PIN);
  per_light = map(light_value, 4095, 0, 0, 100);// anhsang
  //4095 là giá trị tối đa từ ADC 12-bit của ESP32.
//Giá trị này được dùng để chuyển đổi tín hiệu 
//cảm biến ánh sáng thành tỷ lệ phần trăm ánh sáng, giúp bạn dễ 
//dàng biểu diễn mức độ sáng thay vì sử dụng giá trị thô từ cảm biến

  String lightSensorMessage = String(per_light);
  client.publish(MQTT_TopicLight, lightSensorMessage.c_str());
  Serial.print("Light Sensor Value: ");
  Serial.println(per_light);

  //led cam bien as
  if (!mqttMessageReceived) { 
  if (per_light < 20) {
    ledStateFromTemperature2 = HIGH;
  } else if (per_light>=50) {
    ledStateFromTemperature2 = LOW;
  }}

  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);// cam bien nuoc
  float distance = (duration * 0.0343) / 2;

  if (!mqttMessageReceived) { 
  if (distance < 100) {
    ledStateFromTemperature1 = HIGH;
  } else if (distance >= 350) {
    ledStateFromTemperature1 = LOW;
  }}

  String message = String(temperature) + "|" + String(humidity) + "|" + String(distance);
  client.publish(MQTT_Topic, message.c_str());

  // canh bao
if (!mqttMessageReceived) {  //////
if (temperature >= 30) {
    client.publish(MQTT_TopicTB, "Cảnh Báo Nhiệt Độ Cao");
    ledStateFromTemperature = HIGH;
} else if (temperature < 15) {
    client.publish(MQTT_TopicTB, "Cảnh Báo Nhiệt Độ Thấp");
    ledStateFromTemperature = HIGH;
} else {
    client.publish(MQTT_TopicTB, "Bình thường");
    ledStateFromTemperature = LOW;
}
}
 digitalWrite(led, ledStateFromTemperature);
 digitalWrite(led1, ledStateFromTemperature1);
 digitalWrite(led2, ledStateFromTemperature2);
 delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");

  lcd.setCursor(0, 2);
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" cm");

  delay(1000);
}