Fixed world version metadata

- Fresh worlds retain the packaged Iris release number

adapters/bukkit/plugin/src/main/java/art/arcane/iris/Iris.java

@@ -1508,12 +1508,15 @@ public class Iris extends VolmitPlugin implements Listener, ReloadAware {
     public int getIrisVersion() {
         String input = getDescription().getVersion();
         int hyphenIndex = input.indexOf('-');
-        if (hyphenIndex != -1) {
-            String result = input.substring(0, hyphenIndex);
-            result = result.replaceAll("\\.", "");
-            return Integer.parseInt(result);
+        String release = hyphenIndex < 0 ? input : input.substring(0, hyphenIndex);
+        if (!release.matches("[0-9]+(?:\\.[0-9]+)*")) {
+            return -1;
+        }
+        try {
+            return Integer.parseInt(release.replace(".", ""));
+        } catch (NumberFormatException invalid) {
+            return -1;
         }
-        return -1;
     }
 
     public int getMCVersion() {

adapters/bukkit/plugin/src/test/java/art/arcane/iris/IrisVersionNumberTest.java

@@ -0,0 +1,67 @@
+package art.arcane.iris;
+
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.PluginDescriptionFile;
+import org.junit.Test;
+import org.mockito.MockedStatic;
+
+import java.io.InputStream;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.mockito.Answers.CALLS_REAL_METHODS;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockStatic;
+
+public class IrisVersionNumberTest {
+    @Test
+    public void releaseAndQualifiedBuildsUseTheSameVersionNumber() {
+        for (String version : List.of("4.3.3", "4.3.3-SNAPSHOT", "4.3.3-test")) {
+            assertEquals(version, 433, plugin(version).getIrisVersion());
+        }
+    }
+
+    @Test
+    public void processedPluginMetadataProvidesAValidEngineVersion() throws Exception {
+        try (InputStream stream = getClass().getResourceAsStream("/plugin.yml")) {
+            assertNotNull(stream);
+            PluginDescriptionFile description = new PluginDescriptionFile(stream);
+            Iris plugin = mock(Iris.class, CALLS_REAL_METHODS);
+            doReturn(description).when(plugin).getDescription();
+
+            assertNotEquals(-1, plugin.getIrisVersion());
+        }
+    }
+
+    @Test
+    public void malformedAndOverflowingReleaseNumbersStayInvalid() {
+        for (String version : List.of("development", "4..3", ".4.3.3", "4.3.3.", "4.3a.3-test",
+                "2147483648", "999999999999999999999-SNAPSHOT", "-SNAPSHOT")) {
+            assertEquals(version, -1, plugin(version).getIrisVersion());
+        }
+    }
+
+    @Test
+    public void supportedMinecraftVersionsRetainTheirEngineNumbers() {
+        Iris plugin = mock(Iris.class, CALLS_REAL_METHODS);
+        try (MockedStatic<Bukkit> bukkit = mockStatic(Bukkit.class)) {
+            bukkit.when(Bukkit::getVersion).thenReturn("26.1.2-74-ver/26.1.2@e4e17fc (MC: 26.1.2)");
+            assertEquals(2612, plugin.getMCVersion());
+            bukkit.when(Bukkit::getVersion).thenReturn("26.1.2-8-ver/26.1.x@62dc0f2 (MC: 26.1.2)");
+            assertEquals(2612, plugin.getMCVersion());
+            bukkit.when(Bukkit::getVersion).thenReturn("26.2-133 (MC: 26.2)");
+            assertEquals(262, plugin.getMCVersion());
+            bukkit.when(Bukkit::getVersion).thenReturn("26.3-169 (MC: 26.3)");
+            assertEquals(263, plugin.getMCVersion());
+        }
+    }
+
+    private static Iris plugin(String version) {
+        Iris plugin = mock(Iris.class, CALLS_REAL_METHODS);
+        doReturn(new PluginDescriptionFile("Iris", version, Iris.class.getName())).when(plugin).getDescription();
+        return plugin;
+    }
+}