#include <Wire.h>
#include <SoftwareSerial.h>
#include <TinyGPS++.h>
#include <LiquidCrystal_I2C.h>  

// Pin assignments for GSM module
const int gsmRxPin = 6;  //GSM RX
const int gsmTxPin = 7;  //GSM TX

SoftwareSerial gsmSerial(gsmRxPin, gsmTxPin);  // RX, TX

// LCD settings
const int lcdAddress = 0x27;  // I2C address of your LCD
const int lcdCols = 20;       // Number of columns on your LCD
const int lcdRows = 4;        // Number of rows on your LCD

// Create LCD object
LiquidCrystal_I2C lcd(lcdAddress, lcdCols, lcdRows);

// Pin assignments
const int ledPin = 13;         // LED pin
const int buttonPin = 2;       // Button pin
const int microphonePin = A0;  // Microphone analog pin
const int xPin = A1;            // X-axis analog pin
const int yPin = A2;            // Y-axis analog pin
const int zPin = A3;            // Z-axis analog pin

// Threshold values for each axis
const int minXThreshold = -500;  // Example minimum threshold for x-axis
const int maxXThreshold = 500;   // Example maximum threshold for x-axis
const int minYThreshold = -500;  // Example minimum threshold for y-axis
const int maxYThreshold = 500;   // Example maximum threshold for y-axis
const int minZThreshold = -500;  // Example minimum threshold for z-axis
const int maxZThreshold = 500;   // Example maximum threshold for z-axis

// Other constants
const int microphoneThreshold = 100;

double accidentLatitude = 0.0;  // Variable to store accident latitude
double accidentLongitude = 0.0; // Variable to store accident longitude

TinyGPSPlus gps;

void setup() {
  Serial.begin(9600);
  lcd.begin(lcdCols, lcdRows);  // Initialize LCD
  lcd.backlight();               // Turn on LCD backlight
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);

  // Start GPS
  SoftwareSerial gpsSerial(3, 4);  // RX, TX
  
  gpsSerial.begin(9600);
}

void loop() {
  lcd.clear();

  // Read accelerometer data
  // int xValue = analogRead(xPin);
  // int yValue = analogRead(yPin);
  // int zValue = analogRead(zPin);

  int xValue = 550;
  int yValue = 0;
  int zValue = 0;

  // Serial.println("Enter value for xValue:");

  // // Check if there's data available to read from the Serial Monitor
  // if (Serial.available() > 0) {
  //   // Read the integer from the Serial Monitor
  //   xValue = Serial.parseInt();
  // }

  // Read microphone data
  // int microphoneValue = analogRead(microphonePin);

  int microphoneValue = 110;

  // Check for accident conditions
  if (isAccident(xValue, yValue, zValue) && microphoneValue > microphoneThreshold) {
    triggerAlarm();

    if (gps.location.isValid()) {
      accidentLatitude = gps.location.lat();
      accidentLongitude = gps.location.lng();
    }

    Serial.println("Push the button if you are okay.");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Push the button");
    lcd.setCursor(0, 1);
    lcd.print("if you are okay.");
    lcd.setCursor(0, 2);
    lcd.print("Wait 3s");



    delay(3000);

    int countdown = 10; // Set the countdown duration
    bool buttonPressed = false;
    for (int i = countdown; i > 0; i--) {
    digitalWrite(ledPin, HIGH);
    lcd.clear();
    lcd.print("Waiting for ");
    lcd.print(i);
    lcd.setCursor(0, 1);
    lcd.print(" seconds.");

    // Inner loop for more frequent button checks
    for (int j = 0; j < 1000; j++) {
        if (digitalRead(buttonPin) == HIGH) {
            buttonPressed = true;
            break; // Exit the inner loop if the button is pressed
        }
        delay(1); // Check button every 1ms
    }

      if (buttonPressed) {
          break; // Exit the outer loop if the button is pressed
      }
      
    }

    if (buttonPressed) {
      resetSystem();
      return;
    }

    delay(1000);

    // Wait for user response
    // Adjust as needed

    if (!userResponded()) {
      notifyEmergencyServices();
    }
  }

  // Check if the user turned off the alarm
  // if (digitalRead(buttonPin) == HIGH) {
  //   resetSystem();
  // }

  // Other tasks...
}

bool isAccident(int xValue, int yValue, int zValue) {
  // Check if any axis value is outside the specified range
  return (xValue < minXThreshold || xValue > maxXThreshold ||
          yValue < minYThreshold || yValue > maxYThreshold ||
          zValue < minZThreshold || zValue > maxZThreshold);
}

void triggerAlarm() {
  digitalWrite(ledPin, HIGH);
  Serial.println("Accident detected! Alarm activated.");
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Accident detected!");
  delay(1000);
  
}

bool userResponded() {
  // Check if the button is pressed (user response)
  
  return digitalRead(buttonPin) == HIGH;
}

void sendSms(const char* phoneNumber, const char* message) {
  // Initialize GSM module
  gsmSerial.begin(9600);
  
  // Wait for the GSM module to initialize
  delay(1000);

  // Initiating communication
  gsmSerial.print("AT+CMGF=1\r");  // Set SMS mode to text
  delay(100);
  gsmSerial.print("AT+CMGS=\"");
  gsmSerial.print(phoneNumber);
  gsmSerial.print("\"\r");
  delay(100);  // Delay for GSM module processing

  lcd.clear();
  lcd.print("Initiating communication...");
  delay(1500);  // Delay for LCD display

  // Send the message
  gsmSerial.print(message);

  delay(100);

  lcd.clear();
  lcd.print("Sending SMS...");
  delay(1500);

  gsmSerial.write(26);  // Ctrl+Z to end the SMS
  delay(1000);

  lcd.clear();
  lcd.print("SMS sent!");
  delay(1500);


  // Close communication with the GSM module
  gsmSerial.end();

  lcd.clear();
  lcd.print("Close communication with GSM Module");
  delay(10000);
}

void notifyEmergencyServices() {
  // Use Msg91 or any other method to send messages to the police station and hospital
  Serial.println("Notifying emergency services...");
  lcd.clear();
  lcd.print("Notifying emergency services...");
  delay(2000);
  // Print the stored GPS coordinates on the LCD
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Latitude: ");
  lcd.print(accidentLatitude, 6);

  lcd.setCursor(0, 2);
  lcd.print("Longitude: ");
  lcd.print(accidentLongitude, 6);

  // Send SMS to the specified phone number
  sendSms("+917001234567", ("An accident has occurred at Latitude: " + String(accidentLatitude, 6) +
                          " and Longitude: " + String(accidentLongitude, 6)).c_str());



  delay(2000);
}

void resetSystem() {
  digitalWrite(ledPin, LOW);
  Serial.println("Alarm turned off. System reset.");
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Alarm turned off.");
  lcd.setCursor(0, 2);
  lcd.print("System reset.");
  delay(10000);
  // Additional reset tasks if needed
}