package edu.brown.cs.student.term.repl;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * REPL Class maps input to proper class and function for that command.
 */
public class REPL {

  private Map<String, Command> commands;

  /**
   * Constructor for a REPL object.
   * @param userCommands - map of string to Command object for REPL to run
   */
  public REPL(HashMap<String, Command> userCommands) {
    commands = userCommands;
  }

  /**
   * Gets the current map of commands the REPL supports.
   * @return the command map
   */
  public Map<String, Command> getReplCommandMap() {
    return commands; }

  /**
   * Reads user input, maps it to the correct command, and continues.
   */
  public void runREPL() {
    BufferedReader commandHandler = new BufferedReader(new InputStreamReader(System.in));
    try {
      String command = commandHandler.readLine();
      while (command != null) {
        String[] commandPieces = command.split("\\s+(?=([^\"]*\"[^\"]*\")*[^\"]*$)");

        if (commands.containsKey(commandPieces[0])) {
          Command desiredCommand = commands.get(commandPieces[0]);

          String[] arguments = Arrays.copyOfRange(commandPieces, 1, commandPieces.length);

          desiredCommand.run(arguments);
        } else {
          System.out.println("ERROR: Sorry, command not recognized! Please try again.");
        }

        command = commandHandler.readLine();
      }
    } catch (IOException e) {
      //might wanna change this later
      System.out.println("ERROR: Could not locate specified file!");
    }
  }
}