netkorp / spring-boot-telegram-framework

@Component

@CommandGroup("Basic")

@ConditionalOnSingleCandidate(HelpCommand.class)

public class BasicHelpCommand extends AbstractCommand implements HelpCommand {

    /**

     * Returns the commands that will be executed on the chat.

     *

     * @return Command to be executed.

     */

    @Override

    public String getName() {

        return "help";

    }

    /**

     * Processes the data of the commands.

     *

     * @param update The received message.

     */

    @Override

    public void execute(Update update) {

        StringJoiner stringJoiner = new StringJoiner(System.lineSeparator());

        stringJoiner.add("You can control me by sending these commands:" + System.lineSeparator());

        commandsByGroup().forEach((group, commands) -> {

            if (!Strings.isEmpty(group)) {

                stringJoiner.add(String.format("%n<b>%s</b>", group));

            }

            commands.forEach(command -> stringJoiner.add(String.format("%s - %s", command.command(), command.description())));

        });

        bot.sendMessage(stringJoiner.toString(), update.getMessage().getChatId(), true);

    }

    /**

     * Groups the commands by groups.

     *

     * @return The grouped commands.

     */

    private SortedMap<String, List<Command>> commandsByGroup() {

        SortedMap<String, List<Command>> commandsByGroup = new TreeMap<>();

        commandManager.getAvailableCommands().forEach(command -> {

            // Groups

            String group = command.getClass().isAnnotationPresent(CommandGroup.class) ?

                    command.getClass().getAnnotation(CommandGroup.class).value() : "";

            List<Command> commandList = commandsByGroup.getOrDefault(group, new LinkedList<>());

            commandList.add(command);

            commandsByGroup.put(group, commandList);

        });

        return commandsByGroup;

    }

    /**

     * Returns the description of the commands.

     *

     * @return The description.

     */

    @Override

    public String description() {

        return "Shows this message";