package emu.grasscutter.command; import emu.grasscutter.Grasscutter; import emu.grasscutter.game.player.Player; import emu.grasscutter.server.event.game.ReceiveCommandFeedbackEvent; import static emu.grasscutter.utils.Language.translate; import java.util.List; import java.util.StringJoiner; public interface CommandHandler { /** * Send a message to the target. * * @param player The player to send the message to, or null for the server console. * @param message The message to send. */ static void sendMessage(Player player, String message) { // Call command feedback event. ReceiveCommandFeedbackEvent event = new ReceiveCommandFeedbackEvent(player, message); event.call(); if (event.isCanceled()) { // If event is not cancelled, continue. return; } // Send message to target. if (player == null) { Grasscutter.getLogger().info(event.getMessage()); } else { player.dropMessage(event.getMessage().replace("\n\t", "\n\n")); } } static void sendTranslatedMessage(Player player, String messageKey, Object... args) { sendMessage(player, translate(player, messageKey, args)); } default String getUsageString(Player player, String... args) { Command annotation = this.getClass().getAnnotation(Command.class); String usage_prefix = translate(player, "commands.execution.usage_prefix"); String command = annotation.label(); for (String alias : annotation.aliases()) { if (alias.length() < command.length()) command = alias; } if (player != null) { command = "/" + command; } String target = switch (annotation.targetRequirement()) { case NONE -> ""; case OFFLINE -> "@ "; // TODO: make translation keys for offline and online players case ONLINE -> (player == null) ? "@ " : "[@] "; // TODO: make translation keys for offline and online players case PLAYER -> (player == null) ? "@ " : "[@] "; }; String[] usages = annotation.usage(); StringJoiner joiner = new StringJoiner("\n\t"); for (String usage : usages) joiner.add(usage_prefix + command + " " + target + usage); return joiner.toString(); } default void sendUsageMessage(Player player, String... args) { sendMessage(player, getUsageString(player, args)); } default String getLabel() { return this.getClass().getAnnotation(Command.class).label(); } default String getDescriptionString(Player player) { Command annotation = this.getClass().getAnnotation(Command.class); String key = "commands.%s.description".formatted(annotation.label()); return translate(player, key); } /** * Called when a player/console invokes a command. * @param sender The player/console that invoked the command. * @param args The arguments to the command. */ default void execute(Player sender, Player targetPlayer, List args) { } }