#include <ESP32Servo.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <Password.h>
#include <WiFi.h>
#include <ThingSpeak.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
long channel = 2653840;
char *apikey = "0QCJD6ZGZNFIP60R";

#define servoPin 15

Servo servo;

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'},
};
byte rowPins[ROWS] = {23, 19, 18, 5};
byte colPins[COLS] = {17, 16, 4, 2};

bool isDoorLocked = true;
Password password = Password("1234");

byte maxPasswordLength = 6;
byte currentPasswordLength = 0;

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
ThingSpeak.begin(client);
servo.attach(servoPin);
servo.write(10); // initial locked position
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Door LOCK System");
delay(2000);
lcd.clear();
ThingSpeak.setField(1, 0);
int statusCode = ThingSpeak.writeFields(channel, apikey);
if (statusCode == 200) {
Serial.println("Data pushed successfully");
} else {
Serial.println("Push error: " + String(statusCode));
}
displayMessage("Status", "LOCKED");                              
}

void loop() {
if (WiFi.status() != WL_CONNECTED) {
Serial.println("Attempting to connect");
while (WiFi.status() != WL_CONNECTED) {
WiFi.begin(ssid, pass);
delay(1000);
}
Serial.println("\nConnected");
}

lcd.setCursor(3, 0);
isDoorLocked ? lcd.print("DOOR LOCKED") : lcd.print("DOOR OPEN");

char key = keypad.getKey();
Serial.println(key);
if (key != NO_KEY) {
delay(100);

if (key == '#') {
resetPassword();
} else if (key == '*') {
isDoorLocked = !isDoorLocked;
isDoorLocked ? doorLocked() : doorOpen();
} else {
processNumberKey(key);
}
}
}

void processNumberKey(char key) {
if (currentPasswordLength < maxPasswordLength) {
lcd.setCursor(currentPasswordLength + 5, 1);
lcd.print("*");
password.append(key);
currentPasswordLength++;
}
}

void doorLocked() {
if (password.evaluate()) {
servo.write(10); // Locked position
ThingSpeak.setField(1, 0);
int statusCode = ThingSpeak.writeFields(channel, apikey);

if (statusCode == 200) {
Serial.println("Data pushed successfully");
} else {
Serial.println("Push error: " + String(statusCode));
}
displayMessage("Password Correct", "LOCKED");
} else {
displayMessage("Wrong Password", "Try Again");
}
resetPassword();
}

void doorOpen() {
if (password.evaluate()) {
servo.write(180); // Unlocked position
ThingSpeak.setField(1, 1);
int statusCode = ThingSpeak.writeFields(channel, apikey);

if (statusCode == 200) {
Serial.println("Data pushed successfully");
} else {
Serial.println("Push error: " + String(statusCode));
}
displayMessage("Password Correct", "UNLOCKED");
} else {
displayMessage("Wrong Password", "Try Again");
}
resetPassword();
}

void resetPassword() {
password.reset();
currentPasswordLength = 0;
lcd.clear();
lcd.setCursor(0, 0);
}

void displayMessage( char *line1,  char *line2) {
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(line1);
lcd.setCursor(3, 1);
lcd.print(line2);
delay(3000);
lcd.clear();
}