PermissionSigns/src/main/java/net/knarcraft/permissionsigns/manager/PermissionManager.java

package net.knarcraft.permissionsigns.manager;

import net.knarcraft.permissionsigns.container.TemporaryPermission;
import net.milkbowl.vault.permission.Permission;
import org.bukkit.entity.Player;

import java.util.Queue;
import java.util.concurrent.PriorityBlockingQueue;

/**
 * A manager that performs all Permission tasks
 */
public class PermissionManager {

    private static Permission permission;
    private static final Queue<TemporaryPermission> temporaryPermissions = new PriorityBlockingQueue<>();

    /**
     * Initializes the permission manager
     *
     * @param permission <p>The permission object to use for everything permission-related</p>
     */
    public static void initialize(Permission permission) {
        PermissionManager.permission = permission;
    }

    /**
     * Gets the registered temporary permissions
     *
     * @return <p>The registered temporary permissions</p>
     */
    public static Queue<TemporaryPermission> getTemporaryPermissions() {
        return temporaryPermissions;
    }

    /**
     * Grants a permanent permission to a player
     *
     * @param player         <p>The player to grant the permission to</p>
     * @param permissionNode <p>The permission node to grant to the player</p>
     */
    public static void addPermission(Player player, String permissionNode) {
        //TODO: Account for world when granting permissions, if wanted
        permission.playerAdd(null, player, permissionNode);
    }

    /**
     * Grants a temporary permission to a player
     *
     * @param player         <p>The player to give the permission to</p>
     * @param permissionNode <p>The temporary permission to grant</p>
     * @param duration       <p>The duration for which the player should keep the given permission</p>
     */
    public static void addTemporaryPermission(Player player, String permissionNode, int duration) {
        permission.playerAddTransient(null, player, permissionNode);
        temporaryPermissions.add(new TemporaryPermission(player, permissionNode, duration));
        //TODO: Create and store a temporary permission
        // Check all stored temporary permissions on startup:
        //  * Remove expired temporary permissions
        //  * Grant transient permissions
        // In a separate thread, remove any expired permissions, checking at least once every seconds. Might want to
        // store the granted permissions in a priority queue where the priority is the least duration left.
        // How to store temporary permissions? Identifier as Player + permission granted time?
    }

    /**
     * Removes a temporary permission
     *
     * @param player         <p>The player to remove the permission from</p>
     * @param permissionNode <p>The permission node to remove from the player</p>
     */
    public static void removeTemporaryPermission(Player player, String permissionNode) {
        if (player.hasPermission(permissionNode)) {
            permission.playerRemoveTransient(null, player, permissionNode);
        }
    }

}