import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.util.ArrayList;

public class Main {

    public static void main(String[] args) {
        File engList = new File("/Users/alexbandtock/workspace/axa-webapp/src/main/resources/messages.properties");
        File notEngList = new File("/Users/alexbandtock/workspace/axa-webapp/src/main/resources/messages_fr.properties");
        try {
            messageBundleMissing(engList, notEngList);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void messageBundleMissing(File eng, File notEng) throws IOException {
        ArrayList<String> notEngLines = new ArrayList<>();
        ArrayList<String> engKeys = new ArrayList<>();
        ArrayList<String> notEngKeys = new ArrayList<>();
        try (BufferedReader br = new BufferedReader(new FileReader(eng))) {
            String line;
            while ((line = br.readLine()) != null) {
                engKeys.add(line.trim().replace("#", "").split("=")[0]);
            }
        }
        try (BufferedReader br = new BufferedReader(new FileReader(notEng))) {
            String line;
            while ((line = br.readLine()) != null) {
                notEngKeys.add(line.trim().replace("#", "").split("=")[0]);
                notEngLines.add(line);
            }
        }
        engKeys.forEach(key -> {
            if (!notEngKeys.contains(key)) {
                String after = engKeys.get(engKeys.indexOf(key) - 1);
                int newIndex = notEngLines.indexOf(after);
                if (newIndex == -1) {
                    notEngLines.add("#" + key + "=");
                } else {
                    notEngLines.add(newIndex, "#" + key + "=");
                }
            }
        });

        Files.write(eng.toPath(),notEngLines, Charset.defaultCharset());
    }

}