Use injection in and for LimboCache, migrate some legacy settings, remove setGroup from Utils

- New injector method allows to retrieve services if they've already been instantiated -> useful for onDisable() which might be run after aborted initialization
- Deprecate various methods that need to be removed

src/main/java/fr/xephi/authme/permission/AuthGroupType.java

@@ -0,0 +1,20 @@
+package fr.xephi.authme.permission;
+
+/**
+ * Represents the group type based on the user's auth status.
+ */
+public enum AuthGroupType {
+
+    /** Player does not have an account. */
+    UNREGISTERED,
+
+    /** Registered? */
+    REGISTERED, // TODO #761: Remove this or the NOT_LOGGED_IN one
+
+    /** Player is registered and not logged in. */
+    NOT_LOGGED_IN,
+
+    /** Player is logged in. */
+    LOGGED_IN
+
+}

src/main/java/fr/xephi/authme/permission/PermissionsManager.java

@@ -1,6 +1,8 @@
 package fr.xephi.authme.permission;
 
 import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.cache.limbo.LimboCache;
+import fr.xephi.authme.cache.limbo.LimboPlayer;
 import fr.xephi.authme.permission.handlers.BPermissionsHandler;
 import fr.xephi.authme.permission.handlers.GroupManagerHandler;
 import fr.xephi.authme.permission.handlers.PermissionHandler;
@@ -8,6 +10,7 @@ import fr.xephi.authme.permission.handlers.PermissionsBukkitHandler;
 import fr.xephi.authme.permission.handlers.PermissionsExHandler;
 import fr.xephi.authme.permission.handlers.VaultHandler;
 import fr.xephi.authme.permission.handlers.ZPermissionsHandler;
+import fr.xephi.authme.settings.Settings;
 import net.milkbowl.vault.permission.Permission;
 import org.anjocaido.groupmanager.GroupManager;
 import org.bukkit.Bukkit;
@@ -23,6 +26,7 @@ import ru.tehkode.permissions.bukkit.PermissionsEx;
 import javax.annotation.PostConstruct;
 import javax.inject.Inject;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -349,6 +353,61 @@ public class PermissionsManager {
         return result;
     }
 
+    /**
+     * Set the group of a player, by its AuthMe group type.
+     *
+     * @param player The player.
+     * @param group  The group type.
+     *
+     * @return True if succeeded, false otherwise. False is also returned if groups aren't supported
+     * with the current permissions system.
+     */
+    public boolean setGroup(Player player, AuthGroupType group) {
+        // Check whether the permissions check is enabled
+        if (!isEnabled() || !Settings.isPermissionCheckEnabled) {
+            return false;
+        }
+
+        // Make sure group support is available
+        if (!handler.hasGroupSupport()) {
+            ConsoleLogger.showError("The current permissions system doesn't have group support, unable to set group!");
+            return false;
+        }
+
+        switch (group) {
+            case UNREGISTERED:
+                // Remove the other group type groups, set the current group
+                removeGroups(player, Arrays.asList(Settings.getRegisteredGroup, Settings.getUnloggedinGroup));
+                return addGroup(player, Settings.unRegisteredGroup);
+
+            case REGISTERED:
+                // Remove the other group type groups, set the current group
+                removeGroups(player, Arrays.asList(Settings.unRegisteredGroup, Settings.getUnloggedinGroup));
+                return addGroup(player, Settings.getRegisteredGroup);
+
+            case NOT_LOGGED_IN:
+                // Remove the other group type groups, set the current group
+                removeGroups(player, Arrays.asList(Settings.unRegisteredGroup, Settings.getRegisteredGroup));
+                return addGroup(player, Settings.getUnloggedinGroup);
+
+            case LOGGED_IN:
+                // Get the limbo player data
+                LimboPlayer limbo = LimboCache.getInstance().getLimboPlayer(player.getName().toLowerCase());
+                if (limbo == null)
+                    return false;
+
+                // Get the players group
+                String realGroup = limbo.getGroup();
+
+                // Remove the other group types groups, set the real group
+                removeGroups(player, Arrays.asList(Settings.unRegisteredGroup, Settings.getRegisteredGroup, Settings.getUnloggedinGroup));
+                return addGroup(player, realGroup);
+
+            default:
+                return false;
+        }
+    }
+
     /**
      * Remove the permission group of a player, if supported.
      *