#include "secrets.h"
#include <WiFi.h>
#include <PubSubClient.h>
#include <HardwareSerial.h>

// WiFi Credentials
const char* ssid = SECRET_WIFI_SSID;
const char* password = SECRET_WIFI_PASS;

// MQTT Broker
const char* mqtt_server = "192.168.20.30";
const char* mqtt_user = SECRET_MQTT_USER;
const char* password = SECRET_WIFI_PASS;

// MQTT Topics
const char* mqtt_topic = "homeassistant/ESP32/control";

WiFiClient espClient;
PubSubClient client(espClient);

// Define different Serial port for LoRa communication
#define LORA_UART Serial2
#define LORA_TX_PIN 17  // GPIO17 for TX
#define LORA_RX_PIN 16  // GPIO16 for RX

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

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

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

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

  // Handle incoming MQTT messages and send via LoRa
  if (String(topic) == mqtt_topic) {
    LORA_UART.print(messageTemp);
    Serial.println("Sent via LoRa: " + messageTemp);
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client", mqtt_user, mqtt_password)) {
      Serial.println("connected");
      client.subscribe(mqtt_topic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);  // Main serial for debugging
  LORA_UART.begin(9600, SERIAL_8N1, LORA_RX_PIN, LORA_TX_PIN);  // Initialize UART for LoRa

  if (LORA_UART) {
    Serial.println("LoRa Transmitter Initialized");
  } else {
    Serial.println("LoRa Transmitter Initialization Failed");
  }

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  // Check for Serial Monitor command
  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    command.trim();  // Remove any extra whitespace

    if (command == "restart") {
      Serial.println("Restarting Transmitter...");
      delay(1000);  // Give time for message to print
      ESP.restart();
    } else {
      LORA_UART.print(command);
      Serial.println("Sent via LoRa: " + command);
    }
  }

  delay(1000);  // Add a delay to avoid watchdog timer reset
}