#include "WiFi.h"
#include <HTTPClient.h>
#include <PubSubClient.h>
#include "DHTesp.h" // 匯入模組

String ip;
// WiFi信息
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT代理信息
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
char clientId[50];

// 訂閱的主题
const char* topic = "test/dht22";
// WiFi 客户端
WiFiClient espClient;
// MQTT 客户端
PubSubClient client(espClient);
DHTesp dhtSensor; // 建立 dhtSensor 物件
const int ledPin = 4;
const int DHT_PIN = 15;

// WiFi 連線
 void WiFi_connect(){  
  Serial.println("Initializing WiFi...");
  WiFi.mode(WIFI_STA);
  WiFi.disconnect(); // 無線初始化
  Serial.println("Connecting to WiFi ");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  digitalWrite(LED_BUILTIN, HIGH);
  Serial.println("");
  Serial.println("WiFi connected");
  ip = WiFi.localIP().toString(); // 取得分配到的 IP 位址
  Serial.println("IP address: " + ip);
  // 顯示 MAC 位址 
  Serial.println("MAC address: " + WiFi.macAddress()); 
 }

 // 當接收到訊息時執行的回調函数
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived in topic: ");
  Serial.println(topic);

  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    // 顯示收到的訊息
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

 // MQTT連線回调函数
void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      digitalWrite(ledPin, HIGH);          
    } else {
      digitalWrite(ledPin, LOW);
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}
void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0)); 
  int LED_BUILTIN = 2; 
  pinMode(LED_BUILTIN, OUTPUT); 
  pinMode(ledPin, OUTPUT); 
  digitalWrite(LED_BUILTIN, LOW); 
  digitalWrite(ledPin, LOW);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);  
  WiFi_connect(); 
  
  // 設置客户端連線到的 MQTT 代理的服務器和端口
  client.setServer(mqtt_server, mqtt_port);
  // 設定當接收到 MQTT 訊息時執行的調函数
  client.setCallback(callback);
  // 判定 mqtt 連線是否成功 
  if (!client.connected()) {
    mqttReconnect(); // 執行 mqtt 重連調用函數
  } 
  //client.subscribe(topic); // 訂閱主題
}

void loop() {
  TempAndHumidity  data = dhtSensor.getTempAndHumidity(); 
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---"); 
   // mqtt 連線 
  if (!client.connected()) {
    mqttReconnect(); // 執行 mqtt 重連調用函數
  }  
  client.loop(); // 循環執行   
  // 發布一條 MQTT 訊息
  client.publish(topic, (String(data.temperature, 2)+ "°C").c_str());
  client.publish(topic, (String(data.humidity, 1)+ "%").c_str());
  delay(5000);
}