#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include <SPI.h>
#include <SD.h>

//OLED
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

#define OLED_WIDTH 128
#define OLED_HEIGHT 64
#define OLED_ADDR 0x3C //CONFIRM addr

//DHT22
#include <DHT.h>

//LDR
#define LDR_PIN 4

//includes and defines for HC-SR50 PIR Motion Sensor
#define Pir_PIN 26
int motionStatus = 0;

//SD CARD
#include <SD.h>
#define CS_PIN 5
File root;

//Objects OLED and DHT 
Adafruit_SSD1306 display(OLED_WIDTH,OLED_HEIGHT);
DHT dht(25,DHT22);


void setup() {
  Serial.begin(9600);

  //initializing SD CARD
  Serial.print("Initializing SD card... ");
  if (!SD.begin(CS_PIN)) {
    Serial.println("Card initialization failed!");
    while (true);
  }

  Serial.println("initialization done.");

  Serial.println("Files in the card:");
  root = SD.open("/");
  printDirectory(root, 0);
  Serial.println("");

  //initializing Pir Motion Sensor
  pinMode(Pir_PIN, INPUT);//initializing Pir Motion Sensor


  //initializing OLED
  delay(1250); // wait for the OLED to power up
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  Serial.println(F("SH1107 connected"));
  display.clearDisplay();
  delay(1000); //delay 1s
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("DTSD 1st project");
  display.display();

  delay(5000); //delay 5s
  display.clearDisplay();
  dht.begin();
  
} //void setup

void loop(){
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();
  int luminosity = analogRead(LDR_PIN);

  //Serial.print("Temperature: ");
  //Serial.print(temp);
  //Serial.print(" ºC");

  //Serial.print("  Humidity: ");
  //Serial.print(humidity);
  //Serial.print(" %");

  //Serial.print("  Luminosity: ");
  //Serial.print(luminosity);
  //Serial.println(" lux");

  //Motion Sensor
    motionStatus = digitalRead(Pir_PIN);
    if (motionStatus == HIGH){
      Serial.println("Motion Detected");
      display.println("Movement!!!");
      display.display();

      //writing the message for the memory card

      //Temperature
      String message;
      message.reserve(200);
      message = "Temperature: ";
      message += temp;
      message += " ºC";

      //Humidity
      message += "  Humidity: ";
      message += humidity;
      message += " %";

      //Luminosity
      message += "  Luminosity: ";
      message += luminosity;
      message += " lux";
      message += "\n";

      //appending the results to a file
      appendFile("/measure_files.txt", message);

      // Example of reading file from the card:
      File textFile = SD.open("/measure_files.txt");
      if (textFile) {
        while (textFile.available()) {
          Serial.write(textFile.read());
        }
        textFile.close();
      } else {
        Serial.println("error opening measure_files.txt!");
      }

      //writing Temperature to Oled
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(0,0);
      display.print("Temperature: ");
      display.print(temp);
      display.println(" degrees Celsius");
      display.println("");
      display.print("Humidity: ");
      display.print(humidity);
      display.println(" %");
      display.println("");
      display.print("Luminosity: ");
      display.print(luminosity);
      display.println(" lux");
      display.display();

      delay(2000); //wait 2s between measurements
  }else{
      Serial.println("NO Motion Detected");
      display.println("NO movement!!!");
      display.display();
    }
  
  delay(1000); //wait 1s between measurements
} //void loop

//Read SD directory files
void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\n");
      //Serial.print("\t\t");
      //Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}

void appendFile(const char * path, String message){
  Serial.printf("Appending to file: %s\n", path);

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