package com.company;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class main {

    private static String[] KEY_WORDS = {
            "int",
            "float",
            "double",
            "long",
            "string",
            "!=",
            "==",
            "=",
            ";",
            "(",
            ")",
            "{",
            "}",
            "[",
            "]"
    };
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Input the string: ");
        String str = in .nextLine();
        System.out.print("Variables count: " + count_Variables(str) + "\n");

        WordIndexer wordIndexer = new WordIndexer();
        int keyCounter=0;
        for (int index=0;index<KEY_WORDS.length;index++) {
        List<Integer> actualResult = wordIndexer.findWord(str, KEY_WORDS[index]);
            for (int a=0;a<actualResult.size();a++){
                System.out.println("Keyword here -->"+str.substring(actualResult.get(a)));
                System.out.println("Keyword: "+KEY_WORDS[index]);
                System.out.println();
            }
            keyCounter+=actualResult.size();
        }
        System.out.println("Number of kyewords: " +keyCounter);
    }
    public static class WordIndexer {
        public List<Integer> findWord(String textString, String word) {
            List<Integer> indexes = new ArrayList<Integer>();
            String lowerCaseTextString = textString.toLowerCase();
            String lowerCaseWord = word.toLowerCase();
            int wordLength = 0;

            int index = 0;
            while(index != -1){
                index = lowerCaseTextString.indexOf(lowerCaseWord, index + wordLength);  // Slight improvement
                if (index != -1) {
                    indexes.add(index);
                }
                wordLength = word.length();
            }
            return indexes;
        }
    }
    public static int count_Variables(String str) {
        Pattern p = Pattern.compile("\\$[^\\s\\,\\$]+");
        Matcher m = p.matcher(str);
        int varCount=0;
        while (m.find()) {
            varCount++;
            System.out.println("Found a variable " + m.group());
        }


        return varCount; // returns 0 if string starts or ends with space " ".
    }
}