package matching_brackets_exercise;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Scanner;

public class MatchingBracketsWithList {

    public boolean checkBracketsWithList(String expression) {
        HashMap<Character, Character> map = new HashMap<>();
        map.put('{', '}');
        map.put('(', ')');
        map.put('[', ']');

        List<Character> list = new ArrayList<>();
        char[] charArray = expression.toCharArray();
        for (Character c : charArray)
            if (map.keySet().contains(c)) {
                list.add(c);
            } else if (map.values().contains(c)) {
                if (!list.isEmpty() && map.get(list.get(list.size() - 1)) == c) list.remove(list.size() - 1);
                else return false;
            }
        return list.isEmpty();
    }


    public static void main(String[] args) {

        MatchingBracketsWithList pc = new MatchingBracketsWithList();
        File file = new File("CommonName.java");
        try (Scanner in = new Scanner(file)) {
            StringBuilder expression = new StringBuilder();
            while (in.hasNextLine()) {
                expression.append(in.nextLine());
            }
            if (pc.checkBracketsWithList(expression.toString())) System.out.println(file.getName() + " has balanced brackets");
            else System.out.println(file.getName() + " does not have has balanced brackets");
        } catch (FileNotFoundException ex) {
            System.out.println(ex);
        }

    }
}