From b21e6dbcb03e208e13256d1abe39015d302580ac Mon Sep 17 00:00:00 2001
From: Tastybento <tastybento@wasteofplastic.com>
Date: Sat, 2 Dec 2017 10:09:45 -0800
Subject: [PATCH] Small change to panel builder

Enables items to be added without a slot to the end of the inventory.
Also enables slots to be queried.
---
 .../api/panels/builders/PanelBuilder.java     | 43 +++++++++++++++++--
 1 file changed, 39 insertions(+), 4 deletions(-)

diff --git a/src/main/java/us/tastybento/bskyblock/api/panels/builders/PanelBuilder.java b/src/main/java/us/tastybento/bskyblock/api/panels/builders/PanelBuilder.java
index 3916e5eb8..ce49522c5 100644
--- a/src/main/java/us/tastybento/bskyblock/api/panels/builders/PanelBuilder.java
+++ b/src/main/java/us/tastybento/bskyblock/api/panels/builders/PanelBuilder.java
@@ -1,26 +1,61 @@
 package us.tastybento.bskyblock.api.panels.builders;
 
+import java.util.TreeMap;
+
 import us.tastybento.bskyblock.api.panels.Panel;
 import us.tastybento.bskyblock.api.panels.PanelItem;
 
-import java.util.HashMap;
-import java.util.Map;
-
 public class PanelBuilder {
     private String name;
-    private Map<Integer, PanelItem> items = new HashMap<>();
+    private TreeMap<Integer, PanelItem> items = new TreeMap<>();
 
     public PanelBuilder setName(String name) {
         this.name = name;
         return this;
     }
 
+    /**
+     * Add item into a specific slot. If it is already occupied, it will be replaced.
+     * @param slot - slot
+     * @param item - Panel item
+     * @return PanelBuilder
+     */
     public PanelBuilder addItem(int slot, PanelItem item) {
         this.items.put(slot, item);
         return this;
     }
 
+    public int nextSlot() {
+        if (this.items.isEmpty()) {
+            return 0;
+        } else {
+            return items.lastEntry().getKey() + 1;
+        }  
+    }
+    
+    /**
+     * Checks if a slot is occupied in the panel or not
+     * @param slot to check
+     * @return true or false
+     */
+    public boolean slotOccupied(int slot) {
+        return this.items.containsKey(slot);
+    }
     public Panel build() {
         return new Panel(name, items);
     }
+
+    /**
+     * Add item to the panel in the last slot.
+     * @param item - Panel item
+     * @return PanelBuilder
+     */
+    public PanelBuilder addItem(PanelItem item) {
+        if (items.isEmpty()) {
+            this.items.put(0, item);
+        } else {
+            this.items.put(items.lastEntry().getKey() + 1, item);
+        }
+        return this;
+    }
 }