package dev.unlegitdqrk.unlegitlibrary.command;

import dev.unlegitdqrk.unlegitlibrary.command.events.*;
import dev.unlegitdqrk.unlegitlibrary.event.EventManager;

import java.lang.reflect.InvocationTargetException;
import java.util.*;

public final class CommandManager {

    private final Map<Class<? extends Command>, Command> commandInstances = new HashMap<>();
    private final EventManager eventManager;

    public CommandManager(EventManager eventManager) {
        this.eventManager = eventManager;
    }

    // Registriere die Klasse, instanziiere sie einmalig
    public final void registerCommand(Class<? extends Command> commandClass) {
        if (commandInstances.containsKey(commandClass)) return;

        try {
            Command instance = commandClass.getDeclaredConstructor().newInstance();
            commandInstances.put(commandClass, instance);
        } catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
            e.printStackTrace(); // Oder Logger verwenden
        }
    }

    public final void unregisterCommand(Class<? extends Command> commandClass) {
        commandInstances.remove(commandClass);
    }

    public List<Command> getCommands() {
        return new ArrayList<>(commandInstances.values());
    }

    public Command getCommandByName(String name) {
        for (Command cmd : commandInstances.values()) {
            if (cmd.getName().equalsIgnoreCase(name)) return cmd;
        }
        return null;
    }

    public Command getCommandByAlias(String alias) {
        for (Command cmd : commandInstances.values()) {
            for (String a : cmd.getAliases()) {
                if (a.equalsIgnoreCase(alias)) return cmd;
            }
        }
        return null;
    }

    public Command getCommand(String input) {
        Command cmd = getCommandByName(input);
        return (cmd != null) ? cmd : getCommandByAlias(input);
    }

    public void execute(CommandExecutor executor, String line) {
        String[] split = line.trim().split("\\s+");
        if (split.length == 0) return;

        String commandLabel = split[0];
        String[] args = Arrays.copyOfRange(split, 1, split.length);

        Command command = getCommand(commandLabel);
        if (command == null) {
            eventManager.executeEvent(new CommandNotFoundEvent(this, executor, commandLabel, args));
            return;
        }

        // Pre-execute event
        PreCommandExecuteEvent preEvent = new PreCommandExecuteEvent(this, executor, command);
        eventManager.executeEvent(preEvent);
        if (preEvent.isCancelled()) return;

        // Check permissions
        if (!executor.hasPermissions(command.getPermissions())) {
            eventManager.executeEvent(new CommandExecutorMissingPermissionEvent(this, executor, command));
            return;
        }

        // Execute event
        CommandExecuteEvent execEvent = new CommandExecuteEvent(this, executor, command);
        eventManager.executeEvent(execEvent);
        if (execEvent.isCancelled()) return;

        // Execute command
        command.execute(executor, commandLabel, args);

        // Post-execute event
        eventManager.executeEvent(new CommandExecutedEvent(this, executor, command));
    }
}