HelpRenderer for Lamp

HelpRenderer.java

package powerhomes.command.process;

import net.kyori.adventure.audience.Audience;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.event.ClickEvent;
import net.kyori.adventure.text.event.HoverEvent;
import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
import org.bukkit.command.CommandSender;
import powerhomes.PowerHomes;
import powerhomes.util.Preconditions;
import revxrsal.commands.annotation.Default;
import revxrsal.commands.command.ExecutableCommand;
import revxrsal.commands.help.CommandHelp;

public interface HelpRenderer {

    static void renderHelpMenu(CommandSender sender,
                               CommandHelp<Component> help,
                               @Default("1") int page,
                               ExecutableCommand command) {
        Helper.sendHelp(sender, help, page, command);
    }

    class Helper {

        private static final int PAGE_SIZE = 9;

        private static void sendHelp(CommandSender sender, CommandHelp<Component> help, int page, ExecutableCommand command) {
            Audience audience = PowerHomes.get().getAudiences().sender(sender);
            int pageSize = help.getPageSize(PAGE_SIZE);
            int index = Preconditions.coerce(page, 1, pageSize);
            sendTopBar(audience, index, pageSize, command);
            CommandHelp<Component> helpPage = help.paginate(index, PAGE_SIZE);
            for (Component component : helpPage) {
                audience.sendMessage(component);
            }
            sendBottomBar(audience, index, pageSize);
        }

        private static void sendTopBar(Audience audience, int currentPage, int pageSize, ExecutableCommand command) {
            String previous = "/" + command.getPath().toRealString() + " " + (currentPage - 1);
            String next = "/" + command.getPath().toRealString() + " " + (currentPage + 1);
            Component bar = Component.text()
                    .append(lg("&7&m------"))
                    .append(
                            currentPage <= 1 ? lg("&7&l <<")
                                    .hoverEvent(HoverEvent.showText(lg("&fThis is the first page")))
                                    : lg("&a&l <<").clickEvent(ClickEvent.runCommand(previous))
                                    .hoverEvent(HoverEvent.showText(lg("&aPrevious page")))
                    )
                    .append(lg("&r &8| "))
                    .append(
                            currentPage >= pageSize ? lg("&a&l>> ")
                                    .hoverEvent(HoverEvent.showText(lg("&fThis is the last page")))
                                    : lg("&a&l>> ").clickEvent(ClickEvent.runCommand(next))
                                    .hoverEvent(HoverEvent.showText(lg("&aNext page")))
                    )
                    .append(lg("&7&m------"))
                    .build();
            audience.sendMessage(bar);
        }

        private static void sendBottomBar(Audience audience, int index, int pageSize) {
            Component bar = Component.text()
                    .append(lg("&7&m-------&a ("))
                    .append(lg((index == pageSize ? "&2" : "&e") + index + "&7/&2" + pageSize))
                    .append(lg("&a) &7&m-------"))
                    .build();
            audience.sendMessage(bar);
        }

        private static Component lg(String m) { // very long line D:
            return LegacyComponentSerializer.legacyAmpersand().deserialize(m);
        }
    }

}