//Q3
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>

// LCD Setup: Adjust I2C address and dimensions if needed
#define LCD_ADDRESS 0x27 // Change this to your LCD's address if different
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

// Button Pins
#define BUTTON_NEXT 14
#define BUTTON_PREV 12

// Variables for network scanning
int currentNetworkIndex = 0;
int totalNetworks = 0;
bool networksUpdated = false;

// Function prototypes
void scanNetworks();
void displayNetworkSSID(int index);
void displayError(String message);
void scanI2CDevices();

void setup() {
  Serial.begin(115200);
  Wire.begin();
  
  // Scan I2C devices to find the correct address
  scanI2CDevices();

  // LCD initialization
  lcd.begin(LCD_COLUMNS, LCD_ROWS);
  lcd.backlight();
  lcd.clear();

  // Button initialization
  pinMode(BUTTON_NEXT, INPUT_PULLUP);
  pinMode(BUTTON_PREV, INPUT_PULLUP);
  
  // Connect to WiFi (use a known network or open network)
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(1000);
  
  Serial.println("Connecting to WiFi...");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi!");

  // Initial WiFi scan
  scanNetworks();
}

void loop() {
  // Handle button presses
  if (digitalRead(BUTTON_NEXT) == LOW) {
    currentNetworkIndex = (currentNetworkIndex + 1) % totalNetworks;
    displayNetworkSSID(currentNetworkIndex);
    delay(200); // Simple debounce delay
  }
  
  if (digitalRead(BUTTON_PREV) == LOW) {
    currentNetworkIndex = (currentNetworkIndex - 1 + totalNetworks) % totalNetworks;
    displayNetworkSSID(currentNetworkIndex);
    delay(200); // Simple debounce delay
  }

  // Periodically scan for networks if not already updated
  if (!networksUpdated) {
    scanNetworks();
  }
}

// Function to scan WiFi networks and store the total count
void scanNetworks() {
  Serial.println("Scanning WiFi networks...");
  totalNetworks = WiFi.scanNetworks();
  networksUpdated = true;
  
  Serial.print("Total networks found: ");
  Serial.println(totalNetworks);
  
  if (totalNetworks == 0) {
    displayError("No networks found");
  } else {
    // Display the first network on the LCD
    currentNetworkIndex = 0;
    displayNetworkSSID(currentNetworkIndex);
  }
}

// Function to display the SSID of a specific network on the LCD
void displayNetworkSSID(int index) {
  lcd.clear();
  String ssid = WiFi.SSID(index);

  // Display SSID on the LCD
  lcd.setCursor(0, 0);
  lcd.print("SSID:");
  lcd.print(ssid.substring(0, LCD_COLUMNS - 5)); // Display SSID, truncated to fit

  // Display full details on the Serial Monitor
  Serial.println("Displaying network details...");
  Serial.print("SSID: ");
  Serial.println(ssid);
  Serial.print("RSSI: ");
  Serial.println(WiFi.RSSI(index));
  Serial.print("Channel: ");
  Serial.println(WiFi.channel(index));
  Serial.print("Encryption: ");
  Serial.println(WiFi.encryptionType(index));
  Serial.println("-----------------------------");
}

// Function to display error messages
void displayError(String message) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(message);
  Serial.println(message);
}

// Function to scan for I2C devices and print their addresses
void scanI2CDevices() {
  Serial.println("Scanning I2C devices...");

  byte error, address;
  int nDevices = 0;

  for (address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address < 16) Serial.print("0");
      Serial.print(address, HEX);
      Serial.println("!");
      nDevices++;
      delay(500); // Small delay to prevent flooding the serial monitor
    } else if (error == 4) {
      Serial.print("Unknown error at address 0x");
      if (address < 16) Serial.print("0");
      Serial.println(address, HEX);
    }
  }

  if (nDevices == 0) {
    Serial.println("No I2C devices found.");
  } else {
    Serial.println("Scanning complete.");
  }
}