#include <TimeLib.h>

int pinRead = 32;
int localTime;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
unsigned long lastExecutedMillis = 0;
float v0 = 3.3;
int r1 = 10000.0;
double TenMinArr[700] = {0};
double AvgTenMinArr[250] = {0};
int counter = 0, iteration = 0;

void setup() {
  Serial.begin(9600);
  pinMode(pinRead, INPUT);
}

void loop() {
  unsigned long currentMillis = millis();
  double tempf, r2, vin;
  //executed the function once a second
  if(currentMillis - lastExecutedMillis >= 1000){
   String inputStr = Serial.readString();
   inputStr.trim();
   if(inputStr == "?"){
     QueryTenMinAvg();
     QueryTenMin();
   }
    
    lastExecutedMillis = currentMillis;
    Serial.println();
    printTime();
    vin = analogRead(pinRead);

    //formula for converting analog voltage to digital, then voltage into temperature
    r2 = vin * ((v0) / 256);
    r2 = r2 * 0.1;
    tempf = -33.219 * r2 + 160.37;

    Serial.print("Temp ");
    Serial.print(tempf);
    Serial.print(" f ");
    TenMin(tempf);
    counter++;
  }
}

//Prints out the max, min, and average of all of the values recorded since init
void QueryTenMin(){
  float highest = 0, lowest = 100, average = 0;
  for(int k = 0; k < 600; k++){
    if(TenMinArr[k] >= highest && TenMinArr[k] != 0){
      highest = TenMinArr[k];
    } else {
      Serial.print(" Max: ");
      Serial.print(highest);
      break;
    }
  }

  for(int o = 0; o < 600; o++){
    if(TenMinArr[o] <= lowest && TenMinArr[o] != 0){
      lowest = TenMinArr[o];
    } else {
      Serial.print(" Min: ");
      Serial.print(lowest);
      break;
    }
  }

  for(int e = 0; e < 600; e++){
    if(TenMinArr[e] != 0){
      average = average + TenMinArr[e];
    } else {
      average = average / e;
      Serial.print(" Avg: ");
      Serial.print(average);
      break;
    }
  }
}

//Gives the user the most recent 10 minute average available when a character is entered via serial
void QueryTenMinAvg(){
    if(AvgTenMinArr[iteration] == 0){
      printf("No ten-minute average yet!");
    } else {
      Serial.print("The ten-minute average is: ");
      Serial.println(AvgTenMinArr[iteration]);
    }
}

//collects measurements over course of 10 minutes, stores them in an array
void TenMin(double temp){
  TenMinArr[counter] = temp;
  if(counter == 600){
    AvgTenMin();
  }
}

//indexes the values of the 10 minute averages in an array
void AvgTenMin(){
  double compileNum = 0;
  for(int i = 0; i < 600; i++){
    compileNum = compileNum + TenMinArr[i];
  }
  float totalNum = (compileNum / 600);
  AvgTenMinArr[iteration] = totalNum;
  TenMinArr[700] = {0};
  iteration++;
  counter = 0;
}

//prints time since start
void printTime() {
  Serial.print("<");
  hourDisplay();
  Serial.print(hour());
  Serial.print(":");
  minuteDisplay();
  Serial.print(minute());
  Serial.print(":");
  secondDisplay();
  Serial.print(second());
  Serial.print("> ");
}

//prints hour in time functionality
void hourDisplay() {
  if (hour() < 10) {
    Serial.print("0");
  }
}
//prints min in time functionality
void minuteDisplay() {
  if (minute() < 10) {
    Serial.print("0");
  }
}
//prints sec in time functionality
void secondDisplay() {
  if (second() < 10) {
    Serial.print("0");
  }
}