MortarTuner now has actual code

src/xyz/soper/arty/item/MortarTuner.java

@@ -1,4 +1,63 @@
 package xyz.soper.arty.item;
 
+import org.bukkit.ChatColor;
+import org.bukkit.Location;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.List;
+
 public class MortarTuner {
-}
+
+    /**
+     * Linked location of the mortar object. Contains only coordinate data.
+     */
+    private final Location linkedLocation;
+
+    public static final String BASIC_TUNER_NAME = ChatColor.RESET + "Basic Tuner";
+    public static final String NORMAL_TUNER_NAME = ChatColor.RESET + "Mortar Tuner";
+
+    MortarTuner(ItemStack tuner){
+        if(isTuner(tuner)){
+            String[] coords = tuner.getItemMeta().getLore().get(0).substring(20).split(", ");
+            linkedLocation = new Location(
+                    null,
+                    Double.parseDouble(coords[0]),
+                    Double.parseDouble(coords[1]),
+                    Double.parseDouble(coords[2])
+            );
+        } else throw new IllegalArgumentException("Incompatible ItemStack in MortarTuner constructor");
+    }
+
+    /**
+     * Gets the last location of the linked mortar.
+     * WARNING: Contains a null world, must be changed before it can be used.
+     * @return Location of last linked mortar with a null world.
+     */
+    public Location getLinkedLocation() {
+        return linkedLocation;
+    }
+
+    public static void updateTunerLocation(ItemStack tuner, Location location) throws IllegalArgumentException{
+        if(!isTuner(tuner)){
+            throw new IllegalArgumentException("Tried to update an non-tuner item with tuner data");
+        }
+        List<String> lore = tuner.getItemMeta().getLore();
+        lore.set(0, ChatColor.GOLD + "Linked to Mortar at " + location.getBlockX() + ", " + location.getBlockY() + ", " + location.getBlockZ());
+        tuner.getItemMeta().setLore(lore);
+    }
+
+//    public static void updateTunerStatus(ItemStack tuner, boolean reset){
+//        if(!isTuner(tuner)){
+//            throw new IllegalArgumentException("Tried to update an non-tuner item with tuner data");
+//        }
+//        if(reset || )
+//        List<String> lore = tuner.getItemMeta().getLore();
+//        if(lore.size() == 1) lore.add(ChatColor.RED + "VERT");
+//    }
+
+    public static boolean isTuner(ItemStack item){
+        return (item.hasItemMeta() && item.getItemMeta().hasDisplayName())
+                && (item.getItemMeta().getDisplayName().equals(BASIC_TUNER_NAME)
+                || item.getItemMeta().getDisplayName().equals(NORMAL_TUNER_NAME));
+    }
+}