package util;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

public class ConsoleUserInterface {

    // The map of the commands
    private final Map<String, CuiCommand> commandMap;

    private boolean exit;

    // The name of the cui
    private final String name;

    /**
     * @param name The name of the cui
     */
    public ConsoleUserInterface(String name) {
        this.name = name;
        this.commandMap = new HashMap<String, CuiCommand>();

        addCommand("help", new HelpCommand());
        addCommand("exit", new ExitCommand());
    }

    /**
     * Exits the main loop.
     */
    public void exit() {
        this.exit = true;
    }

    /**
     * Adds a command to this cui
     *
     * @param key
     *            The key of the command, i.e. "help" for a HelpCommand.
     * @param cuiCommand
     *            That's the actual CuiCommand.
     */
    public void addCommand(String key, CuiCommand cuiCommand) {
        commandMap.put(key.toLowerCase(), cuiCommand); // Puts the new command in the map
    }

    public void start() {
        String input;

        // These are the the different messages.
        String error = "There is no such command like \"[INPUT]\"";
        String helpMessage = "Type in \"help\" for help :P";

        System.out.println("-----------" + this.name + "-----------");
        System.out.println(helpMessage);

        // Now the programm enters the main loop.
        // You have to invoke exit() in order to exit this loop again.
        while (!exit) {
            input = Input.readString("Next action: ").toLowerCase(); // Reads the input
            System.out.println();
            // checks if there is a key of a command, which the user wants
            if (this.commandMap.containsKey(input)) {
                // if true, then execute the command!
                this.commandMap.get(input).execute();
            } else {
                // Print error message
                System.out.println(error.replaceAll("\\[INPUT\\]", input));
                System.out.println(helpMessage);
            }
        }
        System.exit(0);
    }

    private class ExitCommand implements CuiCommand{
        @Override
        public void execute() {
            exit();
            System.out.println("Exit the programm.");
        }

        @Override
        public String getDescription() {
            return "Exits the program.";
        }
    }

    private class HelpCommand implements CuiCommand{
        @Override
        public void execute() {
            // We use an iterator here.
            Iterator<Entry<String, CuiCommand>> commands = commandMap.entrySet().iterator();

            System.out.println("----Help----");
            while (commands.hasNext()) {
                // For each command entry print the key and the description!
                Map.Entry<String, CuiCommand> entry = commands.next();

                // Finally prints the information
                System.out.println(entry.getKey() + ": "
                        + entry.getValue().getDescription());
            }
            System.out.println();
        }

        @Override
        public String getDescription() {
            return "Shows all commands.";
        }
    }
}