#include "FS.h"
#include "SD.h"
#include "SPI.h"

unsigned long setmillis = 0;
unsigned long sensemillis = 0; //millis for timing
unsigned long tenminmillis = 0;
const unsigned long period = 1000;

#define sensorpin 36
#define buttonpin 39 //declare sensors


int datamessage;
char out[10];

int avgten = 0;
int scanamount = 0;
int maxi = 0;
int mini = 100;


void writeFile(fs::FS &fs, const char *path, const char *message) { //SD Library Write
  Serial.printf("Writing file: %s\n", path);

  File file = fs.open(path, FILE_WRITE);
  if (!file) {
    Serial.println("Failed to open file for writing");
    return;
  }
  if (file.print(message)) {
    Serial.println("File written");
  } else {
    Serial.println("Write failed");
  }
  file.close();
}

void appendFile(fs::FS &fs, const char *path, const char *message) { //Sd Library Append
  Serial.printf("Appending to file: %s\n", path);

  File file = fs.open(path, FILE_APPEND);
  if (!file) {
    Serial.println("Failed to open file for appending");
    return;
  }
  if (file.print(message)) {
    Serial.println("Message appended");
  } else {
    Serial.println("Append failed");
  }
  file.close();
}

void readFile(fs::FS &fs, const char *path) { // SD Library Read
  Serial.printf("Reading file: %s\n", path);

  File file = fs.open(path);
  if (!file) {
    Serial.println("Failed to open file for reading");
    return;
  }

  Serial.print("Moisture Sensor Data from file: \n");
  while (file.available()) {
    Serial.write(file.read());
  }
  file.close();
}

// This function returns the analog soil moisture measurement
int readsensor() {
  delay(10);  // Allow power to settle
  int val = analogRead(sensorpin); //take reading
  int ratio = val / 41;
  int percent = 100 - ratio; //convert to percent wvf
  int finalval = 2 * percent;
  if (finalval > maxi) { //check low and high values
    maxi = finalval; 
  }
  
  if (finalval < mini) {
    mini = finalval;
  }
  return finalval; // Return analog moisture value
}

void takedata() { //millis function to take the reading every second
  if (setmillis - sensemillis >= period) {
      avgten += readsensor(); 
      sensemillis = millis();
      tenminmillis++;
  }
}
void average() { //does the average compution for every ten minutes
    int averageValue = avgten / 600;
    String averageString = String(averageValue);
    appendFile(SD, "/readings.txt", averageString.c_str());
    appendFile(SD, "/readings.txt", "%");
    appendFile(SD, "/readings.txt", "\n");
    delay(10);
    avgten = 0;
    tenminmillis = 0;
}

void viewdata() { //if button presss sends data to serial
  int a = digitalRead(buttonpin);
    if (a == HIGH) {
       Serial.print("Highest Reading:");
       Serial.print(maxi);
       Serial.print("% \nLowest Reading:");
       Serial.print(mini);
       Serial.print("%\n");

       readFile(SD, "/readings.txt");
       delay(100);
    }
return;
}

void setup() { //sets up serial and sd card
  Serial.begin(9600);

  if (!SD.begin()) {
    Serial.println("Card Mount Failed");
    return;
  }
  uint8_t cardType = SD.cardType();

  if (cardType == CARD_NONE) {
    Serial.println("No SD card attached");
    return;
  }

  pinMode(buttonpin, INPUT);
}

void loop() { //loop runs needed data functions

  setmillis = millis();

  takedata();

  if (tenminmillis >= 600) {
   average();
  }

  viewdata();
}