#define BLYNK_TEMPLATE_ID "TMPL4mhud2_gw"
#define BLYNK_TEMPLATE_NAME "IoT in GIS"
#define BLYNK_AUTH_TOKEN "zuLUQu7kWSfAjKSJVo9IZeexKPoU0co4"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <TinyGps++.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// ------ Pin Definitions ------
const int motionSensorPin = 13;  // PIR sensor input pin
const int ledPin = 2;            // ON indicator LED
const int buzzerPin = 4;         // Buzzer output pin

// ------ OLED Display ------
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// ------ Motion Detection ------
bool motionDetected = false;
BlynkTimer timer;  // Built-in timer in Blynk library

// ------ WiFi Credentials ------
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// ------ Nigeria Bounding Box Coordinates ------
const float minLat = 4.0;
const float maxLat = 14.0;
const float minLon = 3.0;
const float maxLon = 15.0;

// ------ Function Prototypes ------
void checkMotion();
void sendRandomLocation();
void initializeOLED();
void connectToWiFiAndBlynk();

void setup() {
  Serial.begin(115200);
  pinMode(motionSensorPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  // Indicate device power with LED
  digitalWrite(ledPin, HIGH);

  // Initialize OLED Display
  initializeOLED();

  // Connect to WiFi and Blynk
  connectToWiFiAndBlynk();

  // Set a timer to check motion every 2 seconds
  timer.setInterval(2000L, checkMotion);
}

void initializeOLED() {
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, hang in an infinite loop
  }

  // Clear the buffer
  display.clearDisplay();

  // Text settings
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);
  display.println("Device ON");
  display.display();
}

void connectToWiFiAndBlynk() {
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, pass);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  Serial.println("Connected to Blynk!");
}

void checkMotion() {
  int motionState = digitalRead(motionSensorPin);
  if (motionState == HIGH) {
    if (!motionDetected) { // Trigger only once per motion event
      Serial.println("Motion detected!");
      motionDetected = true;

      // Activate buzzer with tone function
      tone(buzzerPin, 1000, 500); // 1 kHz for 500ms

      // Send "Motion Detected" message to Blynk
      Blynk.virtualWrite(V2, "Motion Detected!");

      // Generate and send random location
      sendRandomLocation();
    }
  } else {
    motionDetected = false; // Reset motion flag

    // Clear "Motion Detected" message on Blynk when no motion
    Blynk.virtualWrite(V2, "");
  }
}

void sendRandomLocation() {
  // Generate random latitude and longitude within the defined boundaries
  float randomLat = random(minLat * 1000000, maxLat * 1000000) / 1000000.0;
  float randomLon = random(minLon * 1000000, maxLon * 1000000) / 1000000.0;

  // Output the coordinates to Serial Monitor
  Serial.printf("Latitude: %.6f, Longitude: %.6f\n", randomLat, randomLon);

  // Display the coordinates on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("Motion Detected!");
  display.print("Lat: ");
  display.println(randomLat, 6); // Print with 6 decimal places
  display.print("Lon: ");
  display.println(randomLon, 6); // Print with 6 decimal places
  display.display();

  // Send to Blynk (ensure exact values without approximation)
  Blynk.virtualWrite(V0, randomLat);
  Blynk.virtualWrite(V1, randomLon);
}

void loop() {
  Blynk.run();
  timer.run(); // Run the timer to check motion
}