package com.company;

import java.io.*;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

public class Main {

    public static boolean isListContainsEmail(String email, HashSet<String> uniq) {
        for (String item: uniq) {
            if (email.equals(item.split(";")[0])) {
                return true;
            }
        }

        return false;
    }

    public static void main(String[] args) throws IOException {
        String currentPath = System.getProperty("user.dir");

        String inputPath = currentPath.concat("\\input.txt");
        HashSet<String> uniqueLines = new HashSet<>();

        try (BufferedReader bufferedReader = new BufferedReader(new FileReader(inputPath))) {
            String readLine;

            while ((readLine = bufferedReader.readLine()) != null) {
                String email = readLine.split(";")[0];

                if (!isListContainsEmail(email, uniqueLines)) {
                    uniqueLines.add(readLine);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        String output = currentPath.concat("\\output_app.txt");

        BufferedWriter writer = new BufferedWriter(new FileWriter(output, false));

        for (String word: uniqueLines) {
            writer.write(word);
            writer.newLine();
        }
        writer.close();
    }
}