#include <WiFi.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <ArduinoJson.h>


const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";
String macAddressString;
  // Set MQTT topics using the MAC address as a string
char stopic[30];
char ptopic[30];
char datatopic[30];
char lwt_topic[30];
bool cn_check = false;
 
const int ONE_WIRE_PIN = 4;  // dùng pin GPIO4
const int BATTERY_PIN = 16;
const int control_BAT = 14;

const float minValue = 1.05; // Minimum analog value
const float maxValue = 1.26; // Maximum analog value

int count=0;
int alarmt=0;

String type_data1 = "temp";
String type_data2 = "batt";
String type_data3 = "gas";


// Create a OneWire object
OneWire oneWire(ONE_WIRE_PIN);

// Create a DallasTemperature object
DallasTemperature sensors(&oneWire);

// Define a variable to store the temperature reading
float temperature;
float prv_value;
float volt;
int percentage;

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;


void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

   while (WiFi.status() != WL_CONNECTED) {
      digitalWrite(19, HIGH);
      delay(200);
      digitalWrite(19, LOW);
      delay(200);
      Serial.print(".");
    }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Obtain the MAC address as a string
  uint8_t mac[6];
  WiFi.macAddress(mac);

  char macAddress[18];
  sprintf(macAddress, "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    // Convert macAddress to a string
  for (int i = 0; i < 6; i++) {
  char hexChar[8];
  sprintf(hexChar, "%02X", mac[i]);
  macAddressString += hexChar;
  }

  Serial.print("MAC Address: ");
  Serial.println(macAddress);

  sprintf(stopic, "cmd_%s", macAddress);
  Serial.println(stopic);
  sprintf(lwt_topic, "lwt_topic_%s", macAddress);
  Serial.println(lwt_topic);
  sprintf(datatopic, "data_topic_%s", macAddress);
  Serial.println(datatopic);
  sprintf(ptopic, "stt_topic_%s", macAddress);
  Serial.println(ptopic);


}

void ReceivedMessage(char* topic, byte* payload, unsigned int length) {
  // Output the first character of the message to serial (debug)
  StaticJsonDocument<100> doc;
  deserializeJson(doc, payload, length);
  
  // Extract values from the JSON data
  String mac = doc["mac"];
  String id = doc["id"];
  String cmd = doc["cmd"];

  Serial.print(id);
  Serial.print(":");
  Serial.println(cmd);
  

  if(id=="1"&& cmd=="1"){digitalWrite(3, LOW); Serial.println("LOW");} 
  if(id=="1"&& cmd=="0") {digitalWrite(3, HIGH); Serial.println("HIGH");} 

  if(id=="2"&& cmd=="1"){digitalWrite(4, LOW); Serial.println("LOW");} 
  if(id=="2"&& cmd=="0") {digitalWrite(4, HIGH); Serial.println("HIGH");}

  if(id=="3"&& cmd=="1"){digitalWrite(5, LOW); Serial.println("LOW");} 
  if(id=="3"&& cmd=="0") {digitalWrite(5, HIGH); Serial.println("HIGH");}
  if(id=="0"&&cmd=="alarm") {alarmt=1;}
  if(id=="0"&&cmd=="stt"){

     // Read the current states of the pins
      int state12 = digitalRead(3);
      int state13 = digitalRead(4);
      int state14 = digitalRead(5);

      // Create a JSON object
      StaticJsonDocument<100> doc;
      //doc["stt"] = "resp";
      doc["1"] = state12;
      doc["2"] = state13;
      doc["3"] = state14;

      // Serialize the JSON object to a string
      String jsonStr;
      serializeJson(doc, jsonStr);

      const char* payload1 = jsonStr.c_str();
      Serial.print("Publishing:stt");
      client.publish(ptopic, payload1);
  
  }

}


void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
     while (WiFi.status() != WL_CONNECTED) {
      digitalWrite(19, HIGH);
      delay(200);
      digitalWrite(19, LOW);
      delay(200);
      Serial.print(".");
    }
    // Create a random client ID
    String clientId = "ESP32Client-"+macAddressString;
    Serial.println(clientId);
    //clientId += String(random(0xffff), HEX);
    // Attempt to connect

  StaticJsonDocument<50> lwtJson;
  lwtJson["stt"] = 0; // Customize the JSON data as needed

  // Convert the JSON object to a JSON string
  char lwtMessage[200];
  serializeJson(lwtJson, lwtMessage);
 
    if (client.connect(clientId.c_str(),lwt_topic, 2, true, lwtMessage)) {
      Serial.println("connected");
  cn_check =true;   
  DynamicJsonDocument RtJson(50);
  
  RtJson["stt"] = 1; // Customize the JSON data as needed
  // Convert the JSON object to a JSON string
  String RtMessage;
  
  serializeJson(RtJson, RtMessage);
      // Once connected, publish an announcement...
      const char* pl_RtMessage = RtMessage.c_str();
      client.publish(lwt_topic, pl_RtMessage, true);
       // ... and resubscribe
      client.subscribe(stopic);
    } else {
      cn_check =false;
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void publish_data(String type_data, float value)
{     //Serial.print(type_data);
      if (type_data=="temp") prv_value=value;
      //volt = read_voltage();
      //dtostrf(temperature, 6, 2, result_temp); // Leave room for too large numbers!
      //dtostrf(data_temp.humidity, 6, 2, result_hum); // Leave room for too large numbers!
      DynamicJsonDocument json(100);
      json["stt"] =3;
      json["type_data"] = type_data;
      json["value"] = String(value);

      String jsonString;
      serializeJson(json, jsonString);
      
      const char* payload = jsonString.c_str();

      Serial.print("Publishing: ");
      Serial.println(payload);
      client.publish(datatopic, payload);
      Serial.print("Done!");
    
}

void buzzer_funct(){
  digitalWrite(15, HIGH);
  delay(70);
  digitalWrite(15, LOW);
  delay(70);
}

int read_voltage(){
  digitalWrite(control_BAT, LOW);
  delay(100);
  float value= analogRead(BATTERY_PIN);
  if(value==0){
    percentage=0;
  }else {
    volt = value / 4095.0 * 3.3;
    Serial.println(volt);
    float normalizedValue = (volt - minValue) / (maxValue - minValue) + 0.005; // Normalize the value between 0 and 1 
    percentage = normalizedValue * 100; // Convert the normalized value to a percentage
    percentage = (percentage/10)*10;
    Serial.println(normalizedValue);
    Serial.println(percentage);
  }
  
  //delay(100);
  digitalWrite(control_BAT, HIGH);
  return percentage;
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  
  //Serial.println(lwtMessage);
  // Set ADC attenuation to 11dB
  //analogSetAttenuation(ADC_11db); //esp32 only
  //pinMode(3, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  pinMode(19, OUTPUT);  
  pinMode(15, OUTPUT); 
  pinMode(control_BAT, OUTPUT);

  pinMode(18, INPUT_PULLUP);
  pinMode(12, INPUT_PULLUP);
  pinMode(14, INPUT_PULLUP);  
  

  digitalWrite(19, LOW);
  digitalWrite(15, LOW);
  digitalWrite(control_BAT, HIGH);


  setup_wifi();
  sensors.begin();
  client.setServer(mqtt_server, 1883);
  client.setCallback(ReceivedMessage);

}

void loop() {
 
   if (!client.connected()) {
    cn_check =false;
    reconnect();
  }
  client.loop();
  sensors.requestTemperatures();
  digitalWrite(control_BAT, HIGH);
  //int statetest = digitalRead(control_BAT);
  //float test = analogRead(33);
  //Serial.println(test);
  //Serial.println(statetest);
  delay(100);
  // Get the temperature reading from the first sensor  publish_temp(float temperature, String type_data)
  temperature = sensors.getTempCByIndex(0);
  delay(100);
  //Serial.println("Hello, ESP32!");
  int stateGas = digitalRead(12);
  if (alarmt==1) buzzer_funct();
  if (stateGas==0) {buzzer_funct();}
  if (cn_check ==true) digitalWrite(19, LOW); 
  read_voltage();
  delay(500);
  publish_data(type_data2, percentage);
  if (cn_check ==true && temperature!= prv_value) {publish_data(type_data1, temperature);}
 
}