package problem.programmers;

import java.util.*;

class Solution {
    static Map<String,String> commandMessageMap;
    static Map<String,String> nicknameMap = new HashMap<>();
    public String[] solution(String[] record) {
        List<String> answerList = new ArrayList<>();
        
        commandMessageMapInit();
        setNicknameMap(record);

        for(int i=0; i<record.length; i++){
            String[] temp = record[i].split(" ");
            StringBuilder sb = new StringBuilder();
            String command = temp[0];
            String uid = temp[1];
            if(!command.equals("Change")) {
                String commandMessage = commandMessageMap.get(command);
                sb.append(nicknameMap.get(uid) + "님이 " + commandMessage);
                answerList.add(sb.toString());
            }
        }
        String[] answer = new String[answerList.size()];
        answerList.toArray(answer);
        return answer;
    }

    private void setNicknameMap(String[] record){
        for(int i=0; i<record.length; i++){
            String[] temp = record[i].split(" ");
            String command = temp[0];
            String uid = temp[1];

            if(temp.length>2) {
                String nickname = temp[2];
                nicknameMap.put(uid, nickname);
            }
        }
    }

    private void commandMessageMapInit(){
        commandMessageMap = new HashMap<>();
        commandMessageMap.put("Enter","들어왔습니다.");
        commandMessageMap.put("Leave","나갔습니다.");
    }
}