PlayHours/src/main/java/com/mrkayjaydee/playhours/permissions/LuckPermsIntegration.java

package com.mrkayjaydee.playhours.permissions;

import net.minecraft.server.level.ServerPlayer;
import net.minecraftforge.server.ServerLifecycleHooks;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * Handles LuckPerms integration for permission checking.
 * Separates LuckPerms-specific logic from general permission checking.
 */
public final class LuckPermsIntegration {
    private LuckPermsIntegration() {}

    // LuckPerms soft integration - detected at startup
    private static net.luckperms.api.LuckPerms luckPerms;
    static {
        try {
            luckPerms = net.luckperms.api.LuckPermsProvider.get();
        } catch (Throwable ignored) {
            // LuckPerms not present, will use vanilla fallback
            luckPerms = null;
        }
    }

    /**
     * Checks if LuckPerms is available.
     * 
     * @return true if LuckPerms is loaded and available
     */
    public static boolean isAvailable() {
        return luckPerms != null;
    }

    /**
     * Checks a permission for an online player using LuckPerms.
     * 
     * @param player the player to check
     * @param permission the permission node
     * @return true if the player has the permission
     */
    public static boolean hasPermission(ServerPlayer player, String permission) {
        if (!isAvailable()) return false;
        
        var user = luckPerms.getUserManager().getUser(player.getUUID());
        if (user == null) return false;
        
        var data = user.getCachedData().getPermissionData();
        var result = data.checkPermission(permission);
        return result.asBoolean();
    }

    /**
     * Checks a permission for an offline player by UUID using LuckPerms.
     * Uses a timeout to prevent blocking indefinitely.
     * 
     * @param uuid the player UUID
     * @param permission the permission node
     * @return true if the player has the permission, false otherwise or on timeout
     */
    public static boolean hasPermissionOffline(UUID uuid, String permission) {
        if (!isAvailable()) return false;
        
        // Check if player is online first
        var server = ServerLifecycleHooks.getCurrentServer();
        ServerPlayer online = server.getPlayerList().getPlayer(uuid);
        if (online != null) {
            return hasPermission(online, permission);
        }
        
        // Offline LP check (best-effort with timeout to avoid blocking)
        try {
            var future = luckPerms.getUserManager().loadUser(uuid);
            var user = future.get(PermissionConstants.LUCKPERMS_TIMEOUT_SECONDS, TimeUnit.SECONDS);
            if (user != null) {
                var result = user.getCachedData().getPermissionData().checkPermission(permission);
                return result.asBoolean();
            }
        } catch (Throwable t) {
            // Timeout, interrupted, or other error - log and continue
            // This is acceptable as it's best-effort for offline checks
        }
        return false;
    }
}