#include <Wire.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <DHT.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <TinyGPSPlus.h>
#include <DFPlayerMini.h>

// Define Blynk settings
#define BLYNK_TEMPLATE_ID "TMPL3FR9dY-_A"
#define BLYNK_TEMPLATE_NAME "SMART GLASSES FOR VISUALLY BLIND"
#define BLYNK_AUTH_TOKEN "W0UQHwSq9Dhcz1WnUfMhgtRtjp16gwi1" 

// Ultrasonic Sensor Pins
#define TRIG_PIN1 14
#define ECHO_PIN1 13
#define TRIG_PIN2 45
#define ECHO_PIN2 48

// IR Sensor Pins
#define IR_PIN1 15
#define IR_PIN2 42
#define IR_PIN3 35

// DHT22 Sensor Settings
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Buzzer Pin
#define BUZZER_PIN 12

// Temperature Sensor Pins
#define ONE_WIRE_BUS 18
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// GPS Settings
TinyGPSPlus gps;
HardwareSerial gpsSerial(1); // RX, TX

// DFPlayer Mini Settings
#define DFPLAYER_RX_PIN 26
#define DFPLAYER_TX_PIN 27
DFRobotDFPlayerMini dfPlayer;

// WiFi and Blynk settings
char ssid[] = "Hash";
char pass[] = "contrasena";

// ThingSpeak settings
unsigned long myChannelNumber = 2628555;
const char * myWriteAPIKey = "TSBK165SONTOXYR1Y";
WiFiClient client;

void setup() {
  Serial.begin(115200);
  gpsSerial.begin(9600);

  // Initialize sensors and modules
  pinMode(TRIG_PIN1, OUTPUT);
  pinMode(ECHO_PIN1, INPUT);
  pinMode(TRIG_PIN2, OUTPUT);
  pinMode(ECHO_PIN2, INPUT);

  pinMode(IR_PIN1, INPUT);
  pinMode(IR_PIN2, INPUT);
  pinMode(IR_PIN3, INPUT);

  pinMode(BUZZER_PIN, OUTPUT);

  dht.begin();
  sensors.begin();

  // Initialize DFPlayer Mini
  Serial2.begin(9600); // Use Serial2 for DFPlayer Mini
  if (!dfPlayer.begin(Serial2)) {
    Serial.println("DFPlayer Mini not detected!");
    while (true);
  }
  dfPlayer.volume(20); // Set volume (0 to 30)

  // Initialize WiFi, Blynk, and ThingSpeak
  WiFi.begin(ssid, pass);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  ThingSpeak.begin(client);
}

void loop() {
  Blynk.run();
  checkUltrasonicSensors();
  checkIRSensors();
  checkTemperature();
  checkGPS();
  delay(2000); // delay between checks
}

void checkUltrasonicSensors() {
  long duration1, distance1, duration2, distance2;

  // Ultrasonic 1
  digitalWrite(TRIG_PIN1, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN1, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN1, LOW);
  duration1 = pulseIn(ECHO_PIN1, HIGH);
  distance1 = (duration1 * 0.034) / 2;

  // Ultrasonic 2
  digitalWrite(TRIG_PIN2, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN2, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN2, LOW);
  duration2 = pulseIn(ECHO_PIN2, HIGH);
  distance2 = (duration2 * 0.034) / 2;

  // Object detection
  if (distance1 < 50 || distance2 < 50) {
    tone(BUZZER_PIN, 1000, 200);
    speak("Obstacle ahead");
  }

  // Stairs detection (up or down)
  if (distance1 > distance2 + 10) {
    speak("Stairs down detected");
  } else if (distance2 > distance1 + 10) {
    speak("Stairs up detected");
  }
}

void checkIRSensors() {
  int ir1 = digitalRead(IR_PIN1);
  int ir2 = digitalRead(IR_PIN2);
  int ir3 = digitalRead(IR_PIN3);

  // Hole or gap detection
  if ((ir1 == LOW && ir2 == LOW) || (ir2 == LOW && ir3 == LOW) || (ir1 == LOW && ir3 == LOW)) {
    tone(BUZZER_PIN, 1500, 200);
    speak("Gap detected");
  }
}

void checkTemperature() {
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);
  float tempDHT = dht.readTemperature();

  if (temperature > 30 || tempDHT > 30) {
    tone(BUZZER_PIN, 1000, 200);
    speak("Hot object detected");
  }
}

void checkGPS() {
  while (gpsSerial.available() > 0) {
    gps.encode(gpsSerial.read());
    if (gps.location.isUpdated()) {
      float latitude = gps.location.lat();
      float longitude = gps.location.lng();

      // Send location to ThingSpeak
      ThingSpeak.setField(1, latitude);
      ThingSpeak.setField(2, longitude);
      ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

      // Alert via DFPlayer Mini
      speak("Location updated");
    }
  }
}

void speak(String text) {
  // Convert text to audio file ID or use pre-recorded files
  // For simplicity, assume you have pre-recorded audio files with specific IDs
  if (text == "Obstacle ahead") {
    dfPlayer.play(1); // Play track 1
  } else if (text == "Stairs down detected") {
    dfPlayer.play(2); // Play track 2
  } else if (text == "Stairs up detected") {
    dfPlayer.play(3); // Play track 3
  } else if (text == "Gap detected") {
    dfPlayer.play(4); // Play track 4
  } else if (text == "Hot object detected") {
    dfPlayer.play(5); // Play track 5
  } else if (text == "Location updated") {
    dfPlayer.play(6); // Play track 6
  }
}