// First we include the libraries
#include <OneWire.h> 
#include <DallasTemperature.h>
#include <Controllino.h>
#include <SPI.h>
#include <Ethernet.h>

/********************************************************************/
// Data wire is plugged into pin 2 on the Arduino 
#define ONE_WIRE_BUS 2
#define TEMPERATURE_PRECISION 11

/********************************************************************/
// Setup a oneWire instance to communicate with any OneWire devices  
// (not just Maxim/Dallas temperature ICs) 
OneWire oneWire(ONE_WIRE_BUS); 
/********************************************************************/
// Pass our oneWire reference to Dallas Temperature. 
DallasTemperature sensors(&oneWire);
/********************************************************************/ 
DeviceAddress adT1 = { 0x28, 0xF8, 0xE2, 0x80, 0xE3, 0xE1, 0x3C, 0xC2 };
DeviceAddress adT2 = { 0x28, 0x89, 0x9F, 0x80, 0xE3, 0xE1, 0x3C, 0xEC };
DeviceAddress adKW = { 0x28, 0x3B, 0x58, 0x80, 0xE3, 0xE1, 0x3C, 0xF6 };

float TT1_Sp = 30.0;
float TT2_Sp = 30.0;
float TKW_Sp = 0.0;
float Hyst_Sp = 0.5;

float TT1_AV;
float TT2_AV;
float TKW_AV;

byte Act_T1;
byte Act_T2;
byte Act_KW;

byte State_Bypass = 0;
unsigned long previousMillisBypass = 0;
byte State_T1 = 0;
unsigned long previousMillisT1 = 0;
byte State_T2 = 0;
unsigned long previousMillisT2 = 0;

// Variables for Webserver
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x09, 0x70 };
IPAddress ip(192,168,1,57);
EthernetServer server(80);
String readString;
int b_str;
int e_str;
String t1_str;
String t2_str;
float t1_float;
float t2_float; 

void setup(void)
{
  Serial.begin(9600);
  sensors.begin();
  pinMode(22, OUTPUT);
  pinMode(23, OUTPUT);
  pinMode(24, OUTPUT);
  pinMode(30, OUTPUT);
  pinMode(31, OUTPUT);
// set the resolution per device
  sensors.setResolution(adT1, TEMPERATURE_PRECISION);
  sensors.setResolution(adT2, TEMPERATURE_PRECISION);
  sensors.setResolution(adKW, TEMPERATURE_PRECISION);

 // Ethernet Verbindung und Server starten
 Ethernet.begin(mac, ip);
 server.begin();
 Serial.print("Server gestartet. IP: ");
 // IP des Arduino-Servers ausgeben
 Serial.println(Ethernet.localIP());
}

void loop(void)
{
  // Versorge Zeit
  unsigned long currentMillis = millis();

  // Hole Temperaturen
  sensors.requestTemperatures();
  TT1_AV = sensors.getTempC(adT1);
  //TT1_AV = sensors.getTempCByIndex(0);
  TT2_AV = sensors.getTempC(adT2);
  //TT2_AV = sensors.getTempCByIndex(1);
  TKW_AV = sensors.getTempC(adKW);
  //TKW_AV = sensors.getTempCByIndex(2);
 
  // Vergleiche Aktualtemperaturen mit Setpoint
  // Tank 1
  if (TT1_AV >= TT1_Sp + Hyst_Sp){
    Act_T1 = 1;
  }
  if (TT1_AV <= TT1_Sp){
    Act_T1 = 0;
  }
  if (TT2_AV >= TT2_Sp + Hyst_Sp){
    Act_T2 = 1;
  }
  if (TT2_AV <= TT2_Sp){
    Act_T2 = 0;
  }
  if (TKW_AV >= TKW_Sp + Hyst_Sp){
    Act_KW = 1;
  }
  if (TKW_AV <= TKW_Sp){
    Act_KW = 0;
  }

  // Bypass Ventil schließen, wenn T1 oder T2 offen, delay 2s
  if ((Act_T1 == 1|| Act_T2 == 1) && State_Bypass == 0){
    State_Bypass = 1;
    previousMillisBypass = currentMillis;
  }
  if (currentMillis - previousMillisBypass >= 2000 && State_Bypass == 1) {
    digitalWrite (22, HIGH);
  }
  if (Act_T1 == 0 && Act_T2 == 0){
    digitalWrite (22, LOW);
    State_Bypass = 0;
  }
  // Kühlung Tank 1, Ausschaltverzögerung 2s
  if (Act_T1 == 1){
    digitalWrite (23, HIGH);
    State_T1 = 1;  
  }
  if (Act_T1 == 0 && State_T1 == 1){
    previousMillisT1 = currentMillis; 
    State_T1 = 0;   
  }
  if (Act_T1 == 0 && State_T1 == 0 && currentMillis - previousMillisT1 >= 2000){
    previousMillisT1 = currentMillis;
    digitalWrite (23, LOW);
  }
  
  // Kühlung Tank 2, Ausschaltverzögerung 2s
  if (Act_T2 == 1){
    digitalWrite (24, HIGH);
    State_T2 = 1;  
  }
  if (Act_T2 == 0 && State_T2 == 1){
    previousMillisT2 = currentMillis; 
    State_T2 = 0;   
  }
  if (Act_T2 == 0 && State_T2 == 0 && currentMillis - previousMillisT2 >= 2000){
    previousMillisT2 = currentMillis;
    digitalWrite (24, LOW);
  }

  webserver();
}







void webserver() {
 // server.available() schaut, ob ein Client verfügbar ist und Daten
 // an den Server schicken möchte. Gibt dann eine Client-Objekt zurück,
 // sonst false
 EthernetClient client = server.available();
 // Wenn es einen Client gibt, dann...
 if (client) {
 Serial.println("Neuer Client");
 // Jetzt solange Zeichen lesen, bis eine leere Zeile empfangen wurde
 // HTTP Requests enden immer mit einer leeren Zeile 
 boolean currentLineIsBlank = true;
 // Solange Client verbunden 
 while (client.connected()) {
 // client.available() gibt die Anzahl der Zeichen zurück, die zum Lesen
 // verfügbar sind
 if (client.available()) {

 // Ein Zeichen lesen und am seriellen Monitor ausgeben
 char c = client.read();
         if (readString.length() < 100) {

          //store characters to string 
          readString += c; 
          //Serial.print(c);
        } 

 // In currentLineIsBlank merken wir uns, ob diese Zeile bisher leer war.
 // Wenn die Zeile leer ist und ein Zeilenwechsel (das \n) kommt,
 // dann ist die Anfrage zu Ende und wir können antworten
 if (c == '\n' && currentLineIsBlank) {
 Serial.println(readString);
 // Wertänderung T 1 
 b_str = readString.indexOf("T1_Sp=");
 e_str = readString.indexOf(" HTTP/");
 t1_str = "";
 if (b_str != -1){
    b_str = b_str + 6;
    for (int i=b_str; i < e_str; i++){
      t1_str += readString.charAt(i);
      t1_float = t1_str.toFloat();
      if (t1_float != 0){
        TT1_Sp = t1_float;
      }
  }
 }
 // Wertänderung T 1 
 b_str = readString.indexOf("T2_Sp=");
 e_str = readString.indexOf(" HTTP/");
 t2_str = "";
 if (b_str != -1){
    b_str = b_str + 6;
    for (int i=b_str; i < e_str; i++){
      t2_str += readString.charAt(i);
      t2_float = t2_str.toFloat();
      if (t2_float != 0){
        TT2_Sp = t2_float;
      }
  }
 }
 
 // HTTP Header 200 an den Browser schicken
 client.println("HTTP/1.1 200 OK");
 client.println("Content-Type: text/html");
 client.println("Connection: close"); // Verbindung wird nach Antwort beendet
 client.println("Refresh: 60"); // Seite alle 60 Sekunden neu abfragen
 client.println();
 // Ab hier berginnt der HTML-Code, der an den Browser geschickt wird
 client.println("<!DOCTYPE HTML>");
 client.println("<html>");
 client.println("<head><title>Temperatursteuerung</title></head>");
 client.println("<body><h3>Temperatursteuerung</h3>");

 client.println("<svg>");
 client.println(" <g id=\"layer1\">");
 client.println(" <path");
 client.println("      style=\"fill:#000000;stroke-width:0.0282222\"");
 client.println("      d=\"m 19.642666,46.637223 v -2.441222 h 2.441222 2.441223 v 2.441222 2.441222 H 22.083888 19.642666 Z M 14.722747,44.17734 c -0.01043,-0.01043 -0.01897,-1.115402 -0.01897,-2.455489 V 39.285334 H 12.248444 9.793111 V 36.83 34.374667 H 7.351889 4.910667 V 29.464 24.553334 H 2.455334 0 V 19.642667 14.732 H 2.455334 4.910667 V 12.290778 9.8495558 H 7.366 9.821334 V 12.290778 14.732 H 7.366 4.910667 v 4.910667 4.910667 H 7.351889 9.793111 V 22.098 19.642667 h 2.455177 2.455178 l 0.0072,-2.448278 0.0072,-2.448278 2.462388,-0.0072 2.462389,-0.0072 v 4.910822 4.910822 h 2.441222 2.441223 v 2.441067 2.441067 l 2.462388,0.0072 2.462391,0.0072 0.007,2.462389 0.007,2.462389 h 2.44107 2.44106 V 29.464 24.553334 h -4.89651 -4.896554 V 19.642667 14.732 h 2.455333 2.455331 v 2.455334 2.455333 h 2.45534 2.45533 V 22.098 24.553334 h 2.45533 2.45534 V 19.642667 14.732 h -2.45534 -2.45533 V 12.276667 9.8213338 h -4.91082 -4.910826 l 0.0072,-2.448278 0.0072,-2.448278 4.903616,-0.0071 4.90361,-0.0071 v 2.455413 2.455413 h 2.45533 2.45533 v 2.4553332 2.455333 h 2.45534 2.45533 v 4.910667 4.910667 h -2.45523 -2.45526 l -0.007,4.903611 -0.007,4.903611 -2.46238,0.0072 -2.46239,0.0072 v 2.455178 2.455178 h -2.44114 -2.44107 l -0.007,2.448278 -0.007,2.448277 h -2.45553 -2.455333 l -0.0071,-4.903611 -0.0071,-4.903611 H 22.08398 19.642917 l -0.0071,4.903611 -0.0071,4.903611 -2.443419,0.0072 c -1.343881,0.004 -2.451956,-0.0013 -2.462389,-0.01176 z m -0.01207,-12.265062 0.0072,-2.462389 2.462388,-0.0072 2.462389,-0.0072 V 26.994401 24.553334 H 14.717889 9.793111 V 29.464 34.374667 h 2.455178 2.455179 z M 12.283722,9.8283908 9.821334,9.8209908 V 7.3658118 4.9106338 H 14.732 19.642666 V 2.4553334 0 h 2.441222 2.441223 v 2.4553334 2.4553334 h -2.441223 -2.441222 v 2.469444 2.469445 l -2.448278,-0.0069 c -1.346552,-0.0038 -3.556352,-0.01021 -4.910666,-0.01427 z\"");
 client.println("      id=\"path903\" />");
 client.println(" </g>");
 client.println("</svg>");
  
client.print("<table>");
client.print("  <tr>");
client.print("    <th> </th>");
client.print("    <th>  Istwert  </th>");
client.print("    <th>  Sollwert  </th>");
client.print("  </tr>");
client.print("  <tr>");
client.print("    <td>Tank 1</td>");
if (State_T1 == 1){
client.print("    <td bgcolor=#00FF00>"); client.print(TT1_AV); client.print("&deg;C</td>");
}
else{
client.print("    <td>"); client.print(TT1_AV); client.print("&deg;C</td>");  
}
client.print("    <td>"); client.print(TT1_Sp); client.print("&deg;C</td>");
client.print("    <td>");
client.print("    <form action=\"/\" method=\"get\">");
client.print("      <label for=\"fname\">Setpoint</label>");
client.print("      <input type=\"text\" id=\"T1_Sp\" name=\"T1_Sp\">");
client.print("      <input type=\"submit\" value=\"Submit\">");
client.print("    </form>");
client.print("    </td>");
client.print("   </tr>");
client.print("  <tr>");
client.print("    <td>Tank 2</td>");
if (State_T2 == 1){
client.print("    <td bgcolor=#00FF00>"); client.print(TT2_AV); client.print("&deg;C</td>");
}
else{
client.print("    <td>"); client.print(TT2_AV); client.print("&deg;C</td>");  
}
client.print("    <td>"); client.print(TT2_Sp); client.print("&deg;C</td>");
client.print("    <td>");
client.print("    <form action=\"/\" method=\"get\">");
client.print("      <label for=\"fname\">Setpoint</label>");
client.print("      <input type=\"text\" id=\"T2_Sp\" name=\"T2_Sp\">");
client.print("      <input type=\"submit\" value=\"Submit\">");
client.print("    </form>");
client.print("    </td>");
client.print("   </tr>");
client.print("    <td>Bypass</td>");
if (State_Bypass== 0){
client.print("    <td bgcolor=#00FF00></td>");
}
else{
client.print("    <td></td>");  
}
client.print("    <td></td>");
client.print("    <td></td>");

client.print("   </tr>");
client.print("</table>");
client.println("</body></html>");
 break;
 }
 if (c == '\n') {
 // Zeilenwechsel, also currentLineIsBlack erstmal auf True setzen
 currentLineIsBlank = true;
 } 
 else if (c != '\r') {
 // Zeile enthält Zeichen, also currentLineIsBlack auf False setzen
 currentLineIsBlank = false;
 }
 }
 }
 // Kleine Pause
 delay(1);
 // Verbindung schliessen
 client.stop();
 //clearing string for next read
 readString="";
 Serial.println("Verbindung mit Client beendet.");
 Serial.println("");
 }
}