#include <Wire.h>
#include <SoftwareSerial.h>
#include <LiquidCrystal_I2C.h>
#define DEBUG true
#define STARTUP true

#define RX 10      //pin layout
#define TX 11      //
#define measureO A0//
#define measureU A1//
#define relay 8    //
#define button 4   //
#define dimmer 9   //

SoftwareSerial Esp8266(RX, TX);

String ssid = "FRITZ!Box 6591 Cable VW";
String pwd = "15974136204554170633";
int connectionId;

bool skipWifiSetup = false;
bool on = true;//is pump regulation turned on

LiquidCrystal_I2C lcd(0x27, 16, 2);
int displayPage;
int disTimeout = 10000; //display timeout time in milliseconds
unsigned long disTimer=0; //this integer is used to store display timer data;

const int tempSize = 44;
double temptable[ tempSize ] = {
140, 130, 120, 110, 105, 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -12, -14, -16, -18, -20,
};
const int resSize = 44;
double restable[ resSize ] = {
118, 150, 195, 255, 294, 339, 393, 458, 535, 628, 740, 876, 1042, 1244, 1493, 1801, 2184, 2663, 3266, 4029, 4787, 5225, 5710, 6246, 6840, 7499, 8231, 9045, 9950, 10959, 12085, 13342, 14479, 16325, 18094, 20079, 22313, 24827, 27663, 30866, 34489, 38592, 43247, 48536
};
int V = 5; //supply voltage from arduino
double R = 1000; //static resistor
double tempO; //temperature roof sensor
double tempU; //temperature water tank;
double tempDiff;

bool pump; //pump on/off
bool batterySaverMode;
int sampleRateESM = 9000000;//sample rate while energy saving
int defaultSampleRate = 1000;
int difOn = 20; //temp diff for relay activation
int difOff = 5; //temp diff for relay off
int sampleRate = 1000;
int maxTempO = 130; //max temp(emergency stop)
int maxTempU = 90; //max boiler temp
unsigned long compTimer=0;


int errorLog[10]; //this list is used to store the last 10 errors
double errorLogTime[10]; //this list is used to store the time of the last 10 errors

unsigned long timerStart;
int timeOn = 0;


void setup() {
  Serial.begin(115200);
  Esp8266.begin(9600);
  pinMode(relay, OUTPUT);
  pinMode(dimmer, OUTPUT);
  pinMode(button, INPUT_PULLUP);
  
  for(int i =0;i<1;i++){//initialize WIFI connection and loading bar
    sendData("AT\r\n", 1000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
    sendData("AT+RST\r\n", 2000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
    sendData("AT+CWMODE=1\r\n", 2000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
    sendData("AT+CWJAP=\"" + ssid + "\",\"" + pwd + "\"\r\n", 10000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
    sendData("AT+CIFSR\r\n", 2000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
    sendData("AT+CIPMUX=1\r\n", 2000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
    sendData("AT+CIPSERVER=1,80\r\n", 2000, DEBUG, STARTUP);
    if(skipWifiSetup) {break;}
  }
}
String sendData(String command, const int timeout, boolean debug, boolean startup)
{
  String response = "";
    Esp8266.print(command);
    unsigned long time = millis();
    while( (time+timeout) > millis())
    {
        while(Esp8266.available())
          {
              char c = Esp8266.read(); // read the next character.
              response+=c;
          }  
    }
    if(startup)
        {
          if(response.indexOf("OK")==-1){
           
            skipWifiSetup = true;
          }
        }
    if(debug)
          {
          Serial.print(response); //displays the esp response messages in arduino Serial monitor
          }
    return response;
}

void espsend(String d)
{
    String cipSend = " AT+CIPSEND=";
    cipSend += connectionId; 
    cipSend += ",";
    cipSend +=d.length();
    cipSend +="\r\n";
    sendData(cipSend, 1000, DEBUG, false);
    sendData(d, 1000, DEBUG, false); 
}
String createWebPage(){
  String page = "<h1>Solar-Pumpe</h1><p>Temperatur oben: ";
  page+=tempO;
  page+="&#x2103</p><p>Temperatur unten: ";
  page+=tempU;
  page+="&#x2103</p><p>Pumpe: ";
  if(pump){
  page+="an<br>";
  } else {
  page+="aus</p>";
  }
  return page;

}

void loop() {
  if (!skipWifiSetup){//web page response
    if(Esp8266.available())
    {
    /////////////////////Recieving from web browser to toggle led
    if(Esp8266.find("+IPD,"))
      {
      delay(300);
      connectionId = Esp8266.read()-48;
      String webpage = createWebPage();
      espsend(webpage);
      String closeCommand = "AT+CIPCLOSE=";  ////////////////close the socket connection////esp command 
      closeCommand+=connectionId; // append connection id
      closeCommand+="\r\n";
      sendData(closeCommand,3000,DEBUG,false);
      }
    }
  }
  
}