#include <WiFi.h>
#include "PubSubClient.h"
#include "ArduinoJson.h"
#include <ESP32Servo.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* mqttUser = "emqx";
const char* mqttPassword = "public";
const char* mqttServer = "broker.emqx.io";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];
char mqttTopic[50];

WiFiClient espClient;
PubSubClient client(espClient);
Servo myServo;

const int servoPin=15;

int calibrationTime = 30;

long unsigned int lowIn;

long unsigned int pauseValue = 5000;

boolean lockLow = true;
boolean takeLowTime;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  myServo.attach(servoPin);

}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void publishMsg(char* msg)
{
  client.publish(mqttTopic,msg);
}


void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    sprintf(mqttTopic, "iotProjectTPPKM/actuatorTopic");
    if (client.connect(clientId,mqttUser,mqttPassword)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe(mqttTopic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}
bool servoState=true;
void servoTurnOff()
{
  int pos=0;
  if(servoState)return;
  for (pos = 0; pos <= 90; pos += 1) {
    myServo.write(pos);              
    delay(15);                       
  }
  servoState=true;
}

void servoTurnOn()
{
  if(!servoState)return;
  int pos=0;
  for (pos = 90; pos >= 0; pos -= 1) {  
    myServo.write(pos);             
    delay(15);                       
  }
  servoState=false;
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();

  if (String(topic) == String(mqttTopic)) {
    String sCommand=stMessage;

    if(sCommand=="servoTurnOn")
    {
      servoTurnOn();
    }
    if(sCommand=="servoTurnOff")
    {
      servoTurnOff();
    }
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();
}