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

#define AOUT_PIN1 36 // ESP32 pin GPIO36 (ADC0) that connects to AOUT pin of moisture sensor
#define AOUT_PIN2 39 // ESP32 pin GPIO36 (ADC3) that connects to AOUT pin of moisture sensor

#define SD_CS 5
String dataMessage;

int moisture_threshold = 2500;
int ledPin1 = 2;
int ledPin2 = 4;

int value1 = 0;
int value2 = 0;

void setup() {
  Serial.begin(9600);
  // set the ADC attenuation to 11 dB (up to ~3.3V input)
  analogSetAttenuation(ADC_11db);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);

  // Initialize SD card
  SD.begin(SD_CS);
  if(!SD.begin(SD_CS)) {
    Serial.println("Card Mount Failed");
    return;
  }
  uint8_t cardType = SD.cardType();
  if(cardType == CARD_NONE) {
    Serial.println("No SD card attached");
    return;
  }
  Serial.println("Initializing SD card...");
  if (!SD.begin(SD_CS)) {
    Serial.println("ERROR - SD card initialization failed!");
    return;    // init failed
  }
  File file = SD.open("/data.txt");
  if(!file) {
    Serial.println("File doens't exist");
    Serial.println("Creating file...");
    writeFile(SD, "/data.txt", "ESP32 and SD Card \r\n");
  }
  else {
    Serial.println("File already exists");
  }
  file.close();



}

void loop() {

  readMsensors();
  logSDCard();
  delay(2000); //Wait for 2 seconds before writing the next data

}

void logSDCard() {
  dataMessage = "Moisture Value 1 = " + String(value1) + ". Moisture Value 2 = " + String(value2) + ".\n";
  Serial.print("Save data: ");
  Serial.println(dataMessage);
  appendFile(SD, "/data.txt", dataMessage.c_str());
}

// Write to the SD card (DON'T MODIFY THIS FUNCTION)
void writeFile(fs::FS &fs, const char * path, const char * message) {
  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();
}

// Append data to the  SD card (DON'T MODIFY THIS FUNCTION)
void appendFile(fs::FS &fs, const char * path, const char * message) {
  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 readMsensors() {
  value1 = analogRead(AOUT_PIN1); // read the analog value from sensor
  value2 = analogRead(AOUT_PIN2);

  Serial.print("Moisture value 1: ");
  Serial.print(value1);
  Serial.print(". Moisture value 2: ");
  Serial.println(value2);

  if (value1 > moisture_threshold) {
    digitalWrite(ledPin1, HIGH);
  } else {
    digitalWrite(ledPin1, LOW);
  }

if (value2 > moisture_threshold) {
    digitalWrite(ledPin2, HIGH);
  } else {
    digitalWrite(ledPin2, LOW);
  }

}