package de.kentoj.kencommandapi;

import de.kentoj.kencommandapi.api.CommandHandler;
import de.kentoj.kencommandapi.api.literal.RootLiteral;
import org.bukkit.Bukkit;
import org.bukkit.command.CommandSender;
import org.bukkit.command.SimpleCommandMap;
import org.bukkit.permissions.Permissible;
import org.bukkit.plugin.Plugin;
import org.jetbrains.annotations.Nullable;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

public class CommandAPI {

    private final CommandHandler<CommandSender> commandHandler;
    private final List<RootLiteral<CommandSender>> registeredNodes = new ArrayList<>();
    private final SimpleCommandMap commandMap;

    public CommandAPI(Plugin plugin) {
        this.commandHandler = new CommandHandler<>(CommandSender::sendMessage, Permissible::hasPermission);
        Bukkit.getPluginManager().registerEvents(new TabCompleteListener(this, commandHandler), plugin);

        try {
            Field field = Bukkit.getPluginManager().getClass().getDeclaredField("commandMap");
            field.setAccessible(true);
            commandMap = (SimpleCommandMap) field.get(Bukkit.getPluginManager());
        } catch (NoSuchFieldException | IllegalAccessException e) {
            throw new IllegalStateException("failed getting command map", e);
        }
    }

    @Nullable RootLiteral<CommandSender> getRegistered(String name) {
        for (var node : registeredNodes) {
            for (String nodeName : node.getNames()) {
                if (nodeName.equals(name)) return node;
            }
        }
        return null;
    }

    public void register(RootLiteral<CommandSender> rootNode) {
        registeredNodes.add(rootNode);
        commandMap.register(rootNode.getNames()[0], new BukkitKenCommand(commandHandler, rootNode));
    }
}