/**
   ESP32 + DHT22 Example for Wokwi
   https://wokwi.com/arduino/projects/322410731508073042
   https://wokwi.com/projects/377781004761822209
*/
#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
//#include "DHTesp.h"

/************************* WiFi Access Point ***************************/
#define WLAN_SSID "Wokwi-GUEST"
#define WLAN_PASS ""
/************************* Adafruit.io Setup ***************************/
#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883                   // use 8883 for SSL
#define AIO_USERNAME    "raylee0106"
#define AIO_KEY         "aio_csPj22vXOyRaqBfC1REcgrKGUNfN"
#define AIO_FEED_1      "/feeds/bedroom.temp"
#define AIO_FEED_2      "/feeds/bedroom.humi"
#define AIO_FEED_3      "/feeds/bedroom.light"

/************ Global State (you don't need to change this!) ************/
#define DHT_PIN 15
#ifndef LED_BUILTIN
  #define LED_BUILTIN 13
#endif

#define MQTT_RECONNECT_INTERVAL 10000                  // millisecond

//DHTesp dhtSensor;
float humidity=0; // 宣告一個資料型態為float的全域變數humidity
float temperature=0;  // 宣告一個資料型態為float的全域變數temperature

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqttClient(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/
// Setup feeds 'temp' and 'hmdt' for publishing.
Adafruit_MQTT_Publish temp = Adafruit_MQTT_Publish(&mqttClient, AIO_USERNAME AIO_FEED_1);
Adafruit_MQTT_Publish hmdt = Adafruit_MQTT_Publish(&mqttClient, AIO_USERNAME AIO_FEED_2);

// Setup a feed called 'onoff' for subscribing to changes to the ON/OFF button
Adafruit_MQTT_Subscribe onoffbtn = Adafruit_MQTT_Subscribe(&mqttClient, AIO_USERNAME AIO_FEED_3, MQTT_QOS_1);

boolean mqtt_nonblock_reconnect();
void mqtt_callback(char *data, uint16_t len);

void setup(void) {
  pinMode(LED_BUILTIN, OUTPUT);  // Initialize the LED_BUILTIN pin as an output

  // Debug console
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  delay(10);

  Serial.println(F("Adafruit MQTT demo"));

  // Connect to WiFi access point.
  Serial.print("Connecting to ");
  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) { //Check for the connection
    Serial.print(".");
    delay(500);
  }
  Serial.println(); Serial.println("WiFi connected");
  Serial.print("IP address: "); Serial.println(WiFi.localIP());
  Serial.println("Starting MQTT broker");

  // Set the callback function to be called when feed's message arrives
  onoffbtn.setCallback(mqtt_callback);
  
  // Setup MQTT subscription for time feed.
  mqttClient.subscribe(&onoffbtn);
}

unsigned long lastTime = 0;

void loop(void) {
  // Ensure the connection to the MQTT server is alive (this will make the first
  // connection and automatically reconnect when disconnected).  See the mqtt_nonblock_reconnect
  // function definition further below.
  mqtt_nonblock_reconnect();

  // this is our 'wait for incoming subscription packets and callback em' busy subloop
  // try to spend your time here:
  mqttClient.processPackets(10000);
  
  // ping the server to keep the mqtt connection alive
  // NOT required if you are publishing once every KEEPALIVE seconds
  
  if(! mqttClient.ping()) {
    mqttClient.disconnect();
  }
  
  // Publish feeds
  char strTemperature[20], strHumidity[20];
  unsigned long currTime = millis();
  if (currTime - lastTime > MQTT_RECONNECT_INTERVAL) {
    lastTime = currTime;
    // TempAndHumidity data = dhtSensor.getTempAndHumidity();
    humidity = random(100);
    temperature = random(50);
    Serial.println("Temperature: " + String(temperature, 1) + "°C");
    Serial.println("Humidity...: " + String(humidity, 0) + "%");
    Serial.println("---");
    sprintf(strTemperature, "%.1f", temperature);
    sprintf(strHumidity, "%.0f", humidity);
    temp.publish(strTemperature);
    hmdt.publish(strHumidity);
  }
}

// Function called back when an onoffbutton feed message arrives
void mqtt_callback(char *data, uint16_t len) {
  Serial.print("Hey we're in an onoff callback, the button value is: ");
  Serial.println(data);
  if (strcmp(data, "ON") == 0) {
    Serial.println("Turning AC ON");
    digitalWrite(LED_BUILTIN, HIGH);
  } else {
    Serial.println("Turning AC OFF");
    digitalWrite(LED_BUILTIN, LOW);
  }
}

// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
boolean mqtt_nonblock_reconnect() {
  boolean doConn = false;
  int8_t ret;

  // Stop if already connected.
  if (mqttClient.connected()) {
    return doConn;
  }
  Serial.println("Connecting to MQTT... ");
  uint8_t retries = 3;
  while ((ret = mqttClient.connect()) != 0) { // connect will return 0 for connected
    Serial.println(mqttClient.connectErrorString(ret));
    Serial.println("Retrying MQTT connection in 10 seconds...");
    mqttClient.disconnect();
    delay(10000);  // wait 10 seconds
    retries--;
    if (retries == 0) {
      doConn = true;
      // basically die and wait for WDT to reset me
      while (1);
    }
  }
  Serial.println("MQTT Connected!");
  return doConn;
}