Add some checks for shop creation

plugin/src/main/java/com/alttd/playershops/config/Config.java

@@ -34,10 +34,12 @@ public class Config extends AbstractConfiguration {
 
     public static int shopLimit = 100;
     public static boolean usePermissionShopLimit = false;
+    public static String shopCreationWord = "[SHOP]";
     private static void shopSettings() {
         String path = "shop-settings.";
         shopLimit = config.getInt(path + "player-shop-limit", shopLimit);
         usePermissionShopLimit = config.getBoolean(path + "use-permission-based-shop-limit", usePermissionShopLimit);
+        shopCreationWord = config.getString(path + "creation-word", shopCreationWord);
     }
 
     public static String shopLimitPermission = "shop.buildlimit";

plugin/src/main/java/com/alttd/playershops/listener/PlayerListener.java

@@ -4,8 +4,15 @@ import com.alttd.playershops.PlayerShops;
 import com.alttd.playershops.api.Shop;
 import com.alttd.playershops.api.ShopHandler;
 import com.alttd.playershops.config.Config;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
 import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
 import org.bukkit.block.Sign;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.block.data.Directional;
+import org.bukkit.block.data.Rotatable;
+import org.bukkit.block.data.type.WallSign;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
@@ -13,6 +20,7 @@ import org.bukkit.event.block.SignChangeEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.permissions.PermissionAttachmentInfo;
 
+import java.util.List;
 import java.util.UUID;
 
 public class PlayerListener extends EventListener {
@@ -65,4 +73,58 @@ public class PlayerListener extends EventListener {
         if(shop.isInitialized()) event.setCancelled(true);
     }
 
+    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
+    public void onShopCreation(SignChangeEvent event) {
+        Block b = event.getBlock();
+
+        if (!(b.getState() instanceof Sign))
+            return;
+
+        BlockFace facing;
+        BlockData data = b.getState().getBlockData();
+        if (data instanceof WallSign) {
+            facing = ((Directional) data).getFacing();
+        } else {
+            facing = ((Rotatable) data).getRotation();
+        }
+
+        Block bRelative = b.getRelative(facing.getOppositeFace());
+        ShopHandler shopHandler = plugin.getShopHandler();
+
+        if (shopHandler.isShopMaterial(bRelative)) {
+            Sign signBlock = (Sign) b.getState();
+            Component signLine = event.line(0);
+            String signLineString = PlainTextComponentSerializer.plainText().serialize(signLine);
+            if (!signLineString.equalsIgnoreCase(Config.shopCreationWord))
+                return;
+
+            Shop shop = shopHandler.getShop(bRelative.getLocation());
+            if(shop != null) {
+                event.setCancelled(true);
+                // TODO MESSAGE: There is a shop here already.
+                return;
+            }
+
+            Player player = event.getPlayer();
+            UUID playerUUID = player.getUniqueId();
+            if (!player.hasPermission("shop.create")) {
+                event.setCancelled(true);
+                // TODO MESSAGE: You don't have permission to create shops.
+                return;
+            }
+
+            int numberOfShops = shopHandler.getShops(playerUUID).size();
+            int shopLimit = shopHandler.getShopLimit(playerUUID);
+
+            if (numberOfShops >= shopLimit) {
+                event.setCancelled(true);
+                // TODO MESSAGE: You cannot create this shop as you already have reached the limit.
+                return;
+            }
+
+            // TODO instance shopCreationManagement
+        }
+    }
+
+
 }