#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

const int buzzerPin = 10; // Adjust this pin according to your setup

// Define the keypad
const byte ROW_NUM = 4; //four rows
const byte COLUMN_NUM = 4; //four columns

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

//------------------
//AIRTEL SONG--------


const uint8_t pin = 10;
#define  C3  130.81
#define Db3 138.59
#define D3  146.83
#define Eb3 155.56
#define E3  164.81
#define F3  174.61
#define Gb3 185.00
#define G3  196.00
#define Ab3 207.65
#define LA3 220.00
#define Bb3 233.08
#define B3  246.94
#define C4  261.63
#define Db4 277.18
#define D4  293.66
#define Eb4 311.13
#define E4  329.63
#define F4  349.23
#define Gb4 369.99
#define G4  392.00
#define Ab4 415.30
#define LA4 440.00
#define Bb4 466.16
#define B4  493.88
#define C5  523.25
#define Db5 554.37
#define D5  587.33
#define Eb5 622.25
#define E5  659.26
#define F5  698.46
#define Gb5 739.99
#define G5  783.99
#define Ab5 830.61
#define LA5 880.00
#define Bb5 932.33
#define B5  987.77

// DURATION OF THE NOTES 
#define BPM 120    //  you can change this value changing all the others
#define H 2*Q //half 2/4
#define Q 60000/BPM //quarter 1/4 
#define E Q/2   //eighth 1/8
#define S Q/4 // sixteenth 1/16
#define W 4*Q // whole 4/4


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

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; // connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; // connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);

void setup() {
  lcd.begin(16, 2);  // Initialize the LCD with 16x2 characters
  lcd.backlight();
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("1. Custom Play");
  lcd.setCursor(0, 1);
  lcd.print("2. Music Select");
  lcd.setCursor(0, 2);
  lcd.print("3. Volume Setting");

  char key = keypad.getKey();

  if (key) {
    handleKeyPress(key);
  }
}

void handleKeyPress(char key) {
  switch (key) {
    case '1':
      customPlay();
      break;
    case '2':
      lcd.clear();
      musicSelect();
      break;
    case '3':
      volumeSetting();
      break;
    default:
      // Handle other keys if needed
      break;
  }
}

void customPlay() {
  lcd.clear();
  lcd.print("Custom Play");
  lcd.setCursor(0, 1);
  lcd.print("Press keys to play");

  while (true) {
    char key = keypad.getKey();
    if (key == '#') {
      lcd.clear();
      return; // exit custom play mode
    }
    if (key) {
      // Map the key to a frequency and play the tone
      int frequency = map(key, '0', '9', 262, 988); // Adjust the frequency range as needed
      tone(buzzerPin, frequency, 100);            // Adjust the duration as needed
    }
  }
}

void musicSelect() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Music Select");
  lcd.setCursor(0, 1);
  lcd.print("1. Airtel");
  lcd.setCursor(0, 2);
  lcd.print("Music 2");
  

  char key;
  do {
    key = keypad.getKey();
    if (key == '1') {
      airtel_song();

      lcd.clear();
      return; // exit music select after playing
    }
    // Implement logic for selecting other music and play/pause here
    // For simplicity, we will just wait for the '#' key to go back to the main menu
  } while (key != '#');
}

void volumeSetting() {
  lcd.clear();
  lcd.print("Volume Setting");
  lcd.setCursor(0, 1);
  lcd.print("Use keys to adjust");

  int volume = 5; // Initial volume level, adjust as needed
  displayVolume(volume);

  while (true) {
    char key = keypad.getKey();
    if (key == '#') {
      lcd.clear();
      return; // exit volume setting mode
    }
    if (key == 'A' && volume < 10) {
      volume++;
      displayVolume(volume);
    } else if (key == 'B' && volume > 0) {
      volume--;
      displayVolume(volume);
    }
  }
}

void displayVolume(int volume) {
  lcd.setCursor(0, 2);
  lcd.print("Volume: ");
  lcd.print(volume);
  lcd.print("     ");
  // Implement custom character logic for displaying volume level
}

void playShapeOfYou() {
  lcd.clear();
  lcd.print("Shape of You.");
}

void airtel_song(){
    // Line1
    tone(pin,LA4,Q);
    delay(1+Q);
    tone(pin,LA4,E);
    delay(1+E);
    tone(pin,LA4,E);
    delay(1+E);
    tone(pin,LA4,Q);
    delay(1+Q);
    tone(pin,E5,E);
    delay(1+E);
    
    delay(1+E); 
    tone(pin,B4,E);
    delay(1+E);
    tone(pin,C5,E);
    delay(1+E);
    tone(pin,B4,E);
    delay(1+E);
    tone(pin,LA4,E);
    delay(1+E);
    tone(pin,G4,Q);
    delay(1+Q);
    tone(pin,B4,Q);
    delay(1+Q); 
   // Line2
    tone(pin,LA4,E);
    delay(1+E);
    tone(pin,B4,E);
    delay(1+E);
    tone(pin,LA4,E);
    delay(1+E);
    tone(pin,G4,E);
    delay(1+E);
    tone(pin,LA4,E);
    delay(1+E);
     tone(pin,B4,E);
    delay(1+E); 
    tone(pin,C5,E);
    delay(1+E);
    delay(1+E);
    tone(pin,B4,H);
    delay(1+H);
    tone(pin,LA4,E);
    delay(1+E);
    tone(pin,G4,E);
    delay(1+E);
    tone(pin,E4,H);
    delay(1+H);  
  //Line3
  
    tone(pin,LA5,Q);
    delay(1+Q);
    tone(pin,E5,Q);
    delay(1+Q);
    tone(pin,G5,Q);
    delay(1+Q);
    tone(pin,E5,E);
    delay(1+E);
    
    delay(1+E);
    tone(pin,E5,Q);
    delay(1+Q);
     tone(pin,D5,Q);
    delay(1+Q); 
    tone(pin,C5,Q);
    delay(1+Q);
    tone(pin,LA4,Q);
    delay(1+Q); 

    //Line4
 
    tone(pin,C5,Q);
    delay(1+Q);
    tone(pin,D5,Q);
    delay(1+Q);
    tone(pin,E5,Q);
    delay(1+Q);
    tone(pin,F5,E);
    delay(1+E);
    
    delay(1+E);
    tone(pin,D5,W);
    delay(1+W);
     tone(pin,C5,E);
    delay(1+E); 
    tone(pin,B4,E);
    delay(1+E);
    tone(pin,LA4,E);
    delay(1+E); 

 
}