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

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

int b1ls = 1;
int b2ls = 1;
int b3ls = 1;
int b4ls = 1;

String code;
String codels;
String pesan;
String pesanls;
String simbol[36][2] =
{
	{    ".-","A" },
  {  "-...","B" },
	{  "-.-.","C" },
	{   "-..","D" },
	{     ".","E" },
	{  "..-.","F" },
	{   "--.","G" },
	{  "....","H" },
	{    "..","I" },
	{  ".---","J" },
	{   "-.-","K" },
	{  ".-..","L" },
	{    "--","M" },
	{    "-.","N" },
	{   "---","O" },
	{  ".--.","P" },
	{  "--.-","Q" },
	{   ".-.","R" },
	{   "...","S" },
	{     "-","T" },
	{   "..-","U" },
	{  "...-","V" },
	{   ".--","W" },
	{  "-..-","X" },
	{  "-.--","Y" },
	{  "--..","Z" },
	{ ".----","1" },
	{ "..---","2" },
	{ "...--","3" },
	{ "....-","4" },
	{ ".....","5" },
	{ "-....","6" },
	{ "--...","7" },
	{ "---..","8" },
	{ "----.","9" },
	{ "-----","0" }
};

void setup() {
Serial.begin(115200);  

LCD.init();
LCD.backlight();
LCD.setCursor(0, 0);
LCD.print("WELCOME TO");
LCD.setCursor(0, 1);
LCD.print  ("MORSE TL");

pinMode(25,INPUT);
pinMode(26,INPUT);
pinMode(27,INPUT);
pinMode(33,INPUT);

delay(2000);
LCD.clear();
}

void loop() {
int b1 = analogRead(25); delay(10);
int b2 = analogRead(26); delay(10);
int b3 = analogRead(27); delay(10);
int b4 = analogRead(33); delay(10);

Serial.println(b1);
Serial.println(b2);
Serial.println(b3);
Serial.println(b4);

if( codels != code ){LCD.clear();}
if(pesanls != pesan){LCD.clear(); code = "";}

LCD.setCursor(0,0);
LCD.print(pesan);
pesanls = pesan;

LCD.setCursor(0,1);
LCD.print(code);
codels = code;

if(!b1ls >=1 && b1 >=1){code += "-";}
if(!b2ls >=1 && b2 >=1){code += ".";}
if(!b3ls >=1 && b3 >=1){
for(int i = 0; i < 36; i++){
  if (simbol[i][0] == code)
  {pesan += simbol[i][1];}}}
if(!b4ls >=1 && b4 >=1){
  if(code.length() >= 1){code.remove(code.length() - 1);}
  else if(code.length() == 0){pesan.remove(pesan.length() - 1);}
  }

b1ls = b1;
b2ls = b2;
b3ls = b3;
b4ls = b4;
}

/*
#define CARKABUTTONPIN 12 
#define TECKABUTTONPIN 8
#define ODDELBUTTONPIN 10
#define DISPLAY_NUMOFCOLUMNS 16 // Working with a 16x2 display

int carkaButtonState = 0;
int carkaButtonLastState = 0;
int teckaButtonState = 0;
int teckaButtonLastState = 0;
int oddelButtonState = 0;
int oddelButtonLastState = 0;
String tonesBuffer;
String text;
String expectedText;

String symbolsAlphabet[][2] =
{   
    {    ".-", "A" },
    {  "-...", "B" },
    {  "-.-.", "C" },
    {   "-..", "D" },
    {     ".", "E" },
    {  "..-.", "F" },
    {   "--.", "G" },
    {  "....", "H" },
    {    "..", "I" },
    {  ".---", "J" },
    {   "-.-", "K" },
    {  ".-..", "L" },
    {    "--", "M" },
    {    "-.", "N" },
    {   "---", "O" },
    {  ".--.", "P" },
    {  "--.-", "Q" },
    {   ".-.", "R" },
    {   "...", "S" },
    {     "-", "T" },
    {   "..-", "U" },
    { " ...-", "V" },
    {   ".--", "W" },
    {  "-..-", "X" },
    {  "-.--", "Y" },
    {  "--..", "Z" },
    { ".----", "1" },
    { "..---", "2" },
    { "...--", "3" },
    { "....-", "4" },
    { ".....", "5" },
    { "-....", "6" },
    { "--...", "7" },
    { "---..", "8" },
    { "----.", "9" },
    { "-----", "0" }
};

LiquidCrystal_I2C lcd(0x27, DISPLAY_NUMOFCOLUMNS, 2);
char getToneFromButtonStates()
{
    // returns when a button is released
    // i.e., when the current state is 0, the previous state is 1

    if (!carkaButtonState && carkaButtonLastState)
        return '-';
    if (!teckaButtonState && teckaButtonLastState)
        return '.';
    if (!oddelButtonState && oddelButtonLastState)
        return ' ';

    return (char)0;
}

char getSymbolFromBuffer()
{
    if (tonesBuffer == "")
        return ' '; // makes a space if there are no previous characters

    for (int i = 0; i < sizeof symbolsAlphabet / sizeof symbolsAlphabet[0]; i++)
        // Goes through all the symbols and compares the buffer with the alphabet 
        if (tonesBuffer == symbolsAlphabet[i][0])
            return symbolsAlphabet[i][1][0]; // if it matches, returns the corresponding symbol

    // The buffer does not match any symbol, so nothing is sent
    return (char)0;
}

void extractActionFromTonesBuffer()
{
    if (tonesBuffer == "......") // 6x dot
        text.remove(text.length() - 1, 1); // deletes one character
    if (tonesBuffer == "------") // 6x dash
        text = ""; // deletes the entire text
}

void setup() {

    lcd.init();
    lcd.backlight();
    lcd.print("Morseovkovnitko");
    lcd.setCursor(0, 1);
    lcd.print("6x.Smaze1 6x-Vse");

    pinMode(CARKABUTTONPIN, INPUT);
    pinMode(TECKABUTTONPIN, INPUT);
    pinMode(ODDELBUTTONPIN, INPUT);
}

void loop() {

    // read button states
    carkaButtonState = digitalRead(CARKABUTTONPIN);
    teckaButtonState = digitalRead(TECKABUTTONPIN);
    oddelButtonState = digitalRead(ODDELBUTTONPIN);

    char tone = getToneFromButtonStates(); // checks which button is pressed

    if (tone != (char)0)
    {
        if (tone == ' ') // ends the tone sequence, looking for a symbol
        {
            char symbol = getSymbolFromBuffer();

            if (symbol != (char)0) // A tone sequence has found a symbol, writes it to the text
            {
                text += symbol;
                if (text.length() > DISPLAY_NUMOFCOLUMNS) // If the number of characters exceeds the display size,
                    // writes the new character in the first place. Others are deleted.
                {
                    text = (String)symbol;
                }
            }
            else // The tone sequence does not correspond to any symbol, but perhaps some action (like deleting a character)
            {
                extractActionFromTonesBuffer();
            }
            tonesBuffer = ""; // clears the buffer (dots and dashes)
        }
        else // dash or dot
        {
            tonesBuffer += tone;
            if (tonesBuffer.length() > DISPLAY_NUMOFCOLUMNS) // if there are more tones than the display size, clears the buffer
            {
                tonesBuffer = (String)tone;
            }
        }

        // writing to the display is only performed if a button was pressed

        lcd.clear(); // clears the display
        lcd.print(text); // writes the text
        lcd.setCursor(0, 1);
        lcd.print(tonesBuffer); // writes the tone sequence
    }

    // updates the previous state
    carkaButtonLastState = carkaButtonState;
    teckaButtonLastState = teckaButtonState;
    oddelButtonLastState = oddelButtonState;
}
*/