/*
 * ESP32 AJAX Demo
 * Updates and Gets data from webpage without page refresh
 * https://circuits4you.com
 */
#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>

#include "index.h"  //Web page header file

WebServer server(80);

//Enter your SSID and PASSWORD
const char* ssid = "your network name";
const char* password = "your network password";

int lastMeasureTime;
int arrayLength = 4;
int capPins[] = {4,12,27,32};
int holdTimes[] = {0,0,0,0};
int totalTime = 0;
float defaultReadings[] ={0,0,0,0}; // updates in calibration
float currentReadings[] ={0,0,0,0}; // updates in calibration
float threshold = -1.8;
bool booleans[] ={0,0,0,0};
int readings = 5;
int maxcapacitance = 20;  // currently not being used

//===============================================================
// This routine is executed when you open its IP in browser
//===============================================================
void handleRoot() {
 String s = MAIN_page; //Read HTML contents
 server.send(200, "text/html", s); //Send web page
}

void calibration(){
 int sum = 0;
 String s = "Calibr Done:";
 for(int n = 0; n<arrayLength;n++){
   sum = 0;
   for(int i = 0; i<50; i++){ sum+= touchRead(capPins[n]); }
   defaultReadings[n] = sum/50.0;
   s += String(defaultReadings[n]) + ",";
 }
 Serial.println(s);
}
 
void hold0() { holdFunction(0);}
void hold1() { holdFunction(1);}
void hold2() { holdFunction(2);}
void hold3() { holdFunction(3);}

void measure(){
  int sum = 0;
  bool onecount = 0;   
  for(int n = 0; n<arrayLength;n++){
    sum = 0;
    for(int i = 0; i<readings; i++){ sum+= touchRead(capPins[n]); }
    currentReadings[n] = sum/(float)readings;
    // take care of booleans
    if( currentReadings[n] < (defaultReadings[n]+threshold)){
      holdTimes[n]+=1;        // just making this default adding on 1 second
      if(onecount == false){  // add to total count and don't double count
        totalTime +=1;
        onecount = true;
      }
      booleans[n] = 1;
    }else{
      booleans[n] = 0;
    }
  }
  
}

void holdFunction(int number){
  String returnValue = "";
  returnValue += currentReadings[number];
  // take care of the booleans and updating as well as time on the wall
  if(booleans[number] == 1){
    returnValue += " ON green ";
  }else{
    returnValue += " OFF red ";
  }
  returnValue += returnTime(holdTimes[number]);
  server.send(200, "text/plane", returnValue); //Send ADC value only to client ajax request
}

void totalMetrics(){
  server.send(200, "text/plane", returnTime(totalTime)); //Send ADC value only to client ajax request
}

// given seconds this will return the time in 00:00 format
String returnTime(int seconds){
  int mins = seconds/60;
  int secs = seconds%60;
  String s = "";
  if(mins<10){
    s+= "0" + String(mins) + ":";
  } else{
    s+= String(mins) + ":";
  }
  if(secs<10){
    s+= "0" + String(secs);
  } else{
    s+= String(secs);
  }
  return s;
}

//===============================================================
// Setup
//===============================================================

void setup(void){
  Serial.begin(115200);
  Serial.println();
  Serial.println("Booting Sketch...");

/*
//ESP32 As access point
  WiFi.mode(WIFI_AP); //Access Point mode
  WiFi.softAP(ssid, password);
*/
//ESP32 connects to your wifi -----------------------------------
  WiFi.mode(WIFI_STA); //Connectto your wifi
  WiFi.begin(ssid, password);

  Serial.println("Connecting to ");
  Serial.print(ssid);

  //Wait for WiFi to connect
  while(WiFi.waitForConnectResult() != WL_CONNECTED){      
      Serial.print(".");
    }
    
  //If connection successful show IP address in serial monitor
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());  //IP address assigned to your ESP
//----------------------------------------------------------------
 
  server.on("/", handleRoot);      //This is display page
  server.on("/hold0", hold0);//To get update of ADC Value only
  server.on("/hold1", hold1);//To get update of ADC Value only
  server.on("/hold2", hold2);//To get update of ADC Value only
  server.on("/hold3", hold3);//To get update of ADC Value only
  server.on("/metrics", totalMetrics);//To get update of ADC Value only
 
  server.begin();                  //Start server
  Serial.println("HTTP server started");
  delay(1000);
  calibration();
  lastMeasureTime = millis();
}

//===============================================================
// This routine is executed when you open its IP in browser
//===============================================================
void loop(void){
  if((millis()-lastMeasureTime) > 1000){
    measure();
    lastMeasureTime = millis();
  }
  server.handleClient();
  delay(1);
}