#include <Ethernet.h>
#include <Wire.h>
#include <Dns.h>
#include <PubSubClient.h>

// counter und define für die Sendeintervalle für MQTT
#define loopsnd 1000
unsigned long loopcnt=0;



// Netzwerk-Einstellungen
// MAC-Adresse darf nur einmal im Netz vohanden sein
// Fuer jedes Geraet aendern!!
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x1A };


// DNS
DNSClient dnClient;

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);

void sendUDP(String);
void checkUDP();
void clearAll();
void MQTTcallback(char*, byte*, unsigned int);

//MQTT
const char *MQTT_BROKER = "loxberry";
IPAddress mqttbroker(192, 168, 1, 35);
EthernetClient ethClient;
PubSubClient MQTTclient(ethClient);

void setup() {
	Wire.begin();
	Serial.begin(9600);
	//serset w5100
	Ethernet.begin(mac);
	if (!Ethernet.localIP()) {
		Serial.println("dhcp failed");
		Serial.println(Ethernet.linkStatus());
	} else {
		Serial.print("IP is ");
		Serial.println(Ethernet.localIP());
	}
	Udp.begin(localPort); // Start UDP
	Serial.println("Raumluft - aktiv"); // send UDP Ready

	// start the Ethernet connection and the server:
	server.begin();

	while (!bme.begin()) {
		delay(1000);
		Serial.println("No valid BME280 sensor, check wiring! retray");
	}

	Serial.println("1");

	//DNS Client starten
	dnClient.begin(Ethernet.dnsServerIP());
	Serial.print("dns server is at ");
	Serial.println(Ethernet.dnsServerIP());
	if (dnClient.getHostByName(MQTT_BROKER, mqttbroker, 10) == 1) {
		Serial.print(F("loxberry = "));
		Serial.println(mqttbroker);
	} else {
		Serial.println("dns failed ");
		Serial.println(dnClient.getHostByName(MQTT_BROKER, mqttbroker, 10));
		mqttbroker.fromString("192.168.1.35");
		Serial.println(mqttbroker);
	}
	bme.read(Pressure, Temperatur, Humidity);

	// MQTT
	MQTTclient.setServer(mqttbroker, 1883);
	MQTTclient.setCallback(MQTTcallback);

	//Serial leeren
	clearAll();

	Serial.println("Warte auf UDP-Befehl");

}

void loop() {
	String temp = String(Temperatur, 2);
	String hum = String(Humidity, 2);
	String press = String(Pressure / 100, 2);
	char buff[10];
	bme.read(Pressure, Temperatur, Humidity);

	//MQTT
	if (loopcnt++ % 1000 == 0) {
		if (!MQTTclient.connected()) {
			MQTTclient.connect("Arduino", "loxberry", "OSVL0AMqISFXgr5g");
			Serial.print("MQTT Client state:");
			Serial.println(MQTTclient.state());
			// Abonieren von Nachrichten mit dem angegebenen Topic
			//MQTTclient.subscribe("/Stall/arduino1/#");
			Serial.println("connected to MQTT");
		}
		temp.toCharArray(buff, temp.length());
		MQTTclient.publish("Arduino/Aussen/Temperatur", buff);
		press.toCharArray(buff, press.length());
		MQTTclient.publish("Arduino/Aussen/Pressure", buff);
		hum.toCharArray(buff, hum.length());
		MQTTclient.publish("Arduino/Aussen/Humidity", buff);
		snprintf(msg, 50, "%ld", millis());
		Serial.println("Publish message: ");
		Serial.println(msg);
		MQTTclient.publish("Arduino/Aussen/data/Alive", msg);
		loopcnt = 1;
	}

//	MQTTclient.loop(); // Schleife für MQTT

	// schaut on ein UDP Befehl empfangen wurde
	checkUDP();

	if (!strcmp(packetBuffer, "001")) {
		sendUDP(temp);
	}

	if (!strcmp(packetBuffer, "002")) {
		sendUDP(hum);
	}
	if (!strcmp(packetBuffer, "003")) {
		sendUDP(press);
	}
	clearAll();

	// listen for incoming clients
	EthernetClient client = server.available();
	if (client) {
		Serial.println("new client");
		// an http request ends with a blank line
		boolean currentLineIsBlank = true;
		while (client.connected()) {
			if (client.available()) {
				char c = client.read();
				//Serial.write(c);
				// if you've gotten to the end of the line (received a newline
				// character) and the line is blank, the http request has ended,
				// so you can send a reply
				if (c == '\n' && currentLineIsBlank) {
					// send a standard http response header

					client.print("Feuchtigkeit = "); //Prints information within qoutation
					client.print(hum); //Prints the Humidity read from the DHT11 on PIN 5
					client.println(" % ");
					client.print("Temperature = ");
					client.print(temp); //Prints the temperature read from the DHT11 on PIN 5
					client.println(" C ");
					client.print("Luftdruck = ");
					client.print(press);
					client.println(" [hPa]");

					break;
				}
				if (c == '\n') {
					// you're starting a new line
					currentLineIsBlank = true;
				} else if (c != '\r') {
					// you've gotten a character on the current line
					currentLineIsBlank = false;
				}
			}
		}
		// give the web browser time to receive the data
		delay(1);
		// close the connection:
		client.stop();
		Serial.println("client disonnected");

	}
}

//// Module ////
// Serial-Speicher loeschen
void clearAll() {
	// Paket-Buffer leeren
	for (int i = 0; i < UDP_TX_PACKET_MAX_SIZE; i++)
		packetBuffer[i] = (char) 0;
}

// empfangene UDP-Befehle auswerten
void checkUDP() {
	// pruefen ob Daten vorhanden sind
	int packetSize = Udp.parsePacket();
	if (packetSize) {
		Udp.read(packetBuffer, packetSize);
		Serial.print("Packet Content: ");
		Serial.println(packetBuffer);
		RecipientIP = Udp.remoteIP();
		Serial.print("Remote IP: ");
		Serial.println(RecipientIP);
	}
	delay(10);
}

// UDP-Befehl senden
void sendUDP(String text) {
	Udp.beginPacket(RecipientIP, RecipientPort);
	Udp.print(text);
	Udp.endPacket();
	delay(10);
}

void MQTTcallback(char *topic, byte *payload, unsigned int length) {
	Serial.print("Received message [");
	Serial.print(topic);
	Serial.print("] ");
	char msg[length + 1];
	for (unsigned int i = 0; i < length; i++) {
		Serial.print((char) payload[i]);
		msg[i] = (char) payload[i];
	}
	Serial.println("keine Ahnung");

	msg[length] = '\0';
	Serial.println(msg);

	if (strcmp(msg, "on") == 0) {
		digitalWrite(13, HIGH);
	} else if (strcmp(msg, "off") == 0) {
		digitalWrite(13, LOW);
	}
}