#include <Arduino.h>

#include <Keypad.h>

#include "U8glib.h"

#include <Wire.h>

#define SDA_PIN 8
#define SCL_PIN 9

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST); // Fast I2C / TWI

#define LED 21
int progress = 0;

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 39, 40, 41, 42 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 35, 36, 37, 38 }; // Pins connected to R1, R2, R3, R4

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

#define MAX_QR_LENGTH 20

//-------------------------------------//
class ParkingSpace {
  public:
      ParkingSpace(int pin, int number) : pin(pin), number(number), occupied(false) {
          pinMode(pin, INPUT_PULLUP); // Initialize limit switch pin
      }
  
      void check() {
          bool currentState = digitalRead(pin) == LOW; // LOW when pressed
          if (currentState != occupied) {
              occupied = currentState;
              Serial.print("Parking Space ");
              Serial.print(number);
              Serial.print(": ");
              Serial.println(occupied ? "Occupied" : "Empty");
              // Update LCD here or notify an LCDManager
          }
      }
  
      bool isOccupied() const {
          return occupied;
      }
  
      void setQRData(const String& data) {
          qrData = data;
      }
  
      String getQRData() const {
          return qrData;
      }
  
      int getNumber() const {
          return number;
      }
  
  private:
      int pin;
      int number;
      bool occupied;
      String qrData;
  };

//------------------------------------------------//

class QRScanner {
  public:
      // Update method to check for incoming serial data
      String update();
      
      // Method to handle the received command (can be overridden or modified)
      virtual void handleCommand(String command);

  
  private:
      String commandBuffer;  // Buffer to accumulate incoming data
  };
  
  // Update method to read serial data
  String QRScanner::update() {
      while (Serial.available()) {
          char c = Serial.read();
          if (c == '\n') {
              handleCommand(commandBuffer);
              commandBuffer = "";  // Reset buffer after handling
          } else if (c != '\r') {
              commandBuffer += c;  // Accumulate characters
          }
      }
      return commandBuffer;
  }
  
  // Default command handler (can be overridden in derived classes)
  void QRScanner::handleCommand(String command) {
      // Implement default behavior or leave empty for subclasses to override
      //dito ung ishoshow sa OLED
      Serial.println("Received command: " + command);
    
  }
  
QRScanner qrScanner;

ParkingSpace spaces[] = {
  ParkingSpace(18, 1),
  ParkingSpace(17, 2),
  ParkingSpace(16, 3),
  ParkingSpace(15, 4),
  ParkingSpace(7, 5),
  ParkingSpace(6, 6),
  ParkingSpace(5, 7),
  ParkingSpace(4, 8),
};

const String password = "1234"; // change your password here
String input_password;

void setup() {
  pinMode(LED, OUTPUT);
  Wire.begin(SDA_PIN, SCL_PIN);
  Serial.begin(115200);
  Serial.println("Data received from UART chip:");

  u8g.setFont(u8g_font_tpssb);
  u8g.setColorIndex(1);
}


void loop() {
  // digitalWrite(LED, HIGH);
  // delay(500);
  // digitalWrite(LED, LOW);
  // delay(500);

  // while (Serial.available()) {
  //   Serial.print((char)Serial.read());
  // }

  String qrCode = qrScanner.update();
    
  // If a complete QR code is received, process it
  u8g.firstPage();
  do {
    u8g.drawStr(25, 50, "Progress Bar");
    u8g.drawFrame(0, 10, 128, 20);
    u8g.drawBox(10, 15, progress, 10);
  } while ( u8g.nextPage() );

  if (progress < 108) {
    progress++;
  } else {
    progress = 0;
  }
  

  char key = keypad.getKey();

  if (key){
    Serial.println(key);

    if(key == '*') {
      input_password = ""; // clear input password
    } else if(key == '#') {
      if(password == input_password) {
        Serial.println("password is correct, here num: ");
        // DO YOUR WORK HERE
        int numbah = spaces[1].getNumber();
        Serial.println(String(numbah));
        
      } else {
        Serial.println("password is incorrect, try again");
      }

      input_password = ""; // clear input password
    } else {
      input_password += key; // append new character to input password string
    }
  }

  for (auto& space : spaces) { //needs improvement, dont check all the time
    space.check();
  }
}