feat(pocket-base): add purchasable biome changes

src/test/java/games/dmg/spigotbase/BaseSettingsCommandTest.java

@@ -100,6 +100,25 @@ final class BaseSettingsCommandTest {
             List.of("mobs"),
             command.onTabComplete(null, null, "basesettings", new String[] {"pocket", "m"})
         );
+        assertEquals(
+            List.of("type"),
+            command.onTabComplete(null, null, "basesettings", new String[] {"pocket", "t"})
+        );
+        assertEquals(
+            List.of("nether"),
+            command.onTabComplete(
+                null, null, "basesettings", new String[] {"pocket", "type", "n"}
+            )
+        );
+        assertEquals(
+            List.of("crimson_forest"),
+            command.onTabComplete(
+                null,
+                null,
+                "basesettings",
+                new String[] {"pocket", "type", "nether", "c"}
+            )
+        );
         assertEquals(
             List.of("enable"),
             command.onTabComplete(
@@ -209,6 +228,73 @@ final class BaseSettingsCommandTest {
         verify(inventory).setStorageContents(any(ItemStack[].class));
     }
 
+    @Test
+    void pocketOwnerCanPurchaseBiomeChangeWithConfiguredCurrency() throws Exception {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        PlayerInventory inventory = mock(PlayerInventory.class);
+        when(player.getInventory()).thenReturn(inventory);
+        when(inventory.getStorageContents()).thenReturn(new ItemStack[] {
+            new ItemStack(Material.NETHERITE_BLOCK, 16)
+        });
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder"))
+            .thenReturn(PlayerState.newPlayer(playerId, "Builder"));
+        PocketBaseManager pocketBases = mock(PocketBaseManager.class);
+        PocketBaseState current = new PocketBaseState(playerId, 1, java.util.Optional.empty());
+        when(pocketBases.state(playerId)).thenReturn(current);
+        when(pocketBases.setBiome(playerId, PocketBaseBiome.CRIMSON_FOREST))
+            .thenReturn(current.withBiome(PocketBaseBiome.CRIMSON_FOREST));
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            stateManager,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class),
+            pocketBases
+        );
+
+        command.onCommand(player, null, "basesettings", new String[] {
+            "pocket", "type", "nether", "crimson_forest"
+        });
+
+        verify(pocketBases).setBiome(playerId, PocketBaseBiome.CRIMSON_FOREST);
+        verify(inventory).setStorageContents(any(ItemStack[].class));
+    }
+
+    @Test
+    void selectingCurrentPocketBiomeDoesNotCharge() throws Exception {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        PlayerInventory inventory = mock(PlayerInventory.class);
+        when(player.getInventory()).thenReturn(inventory);
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder"))
+            .thenReturn(PlayerState.newPlayer(playerId, "Builder"));
+        PocketBaseManager pocketBases = mock(PocketBaseManager.class);
+        when(pocketBases.state(playerId)).thenReturn(
+            new PocketBaseState(playerId, 1, java.util.Optional.empty())
+        );
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            stateManager,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class),
+            pocketBases
+        );
+
+        command.onCommand(player, null, "basesettings", new String[] {
+            "pocket", "type", "void", "the_void"
+        });
+
+        verify(pocketBases, never()).setBiome(
+            org.mockito.ArgumentMatchers.eq(playerId),
+            org.mockito.ArgumentMatchers.any(PocketBaseBiome.class)
+        );
+        verify(inventory, never()).setStorageContents(any(ItemStack[].class));
+    }
+
     @Test
     void pocketOwnerCanEnableNaturalMobSpawning() throws Exception {
         UUID playerId = UUID.randomUUID();
@@ -366,6 +452,7 @@ final class BaseSettingsCommandTest {
 
         verify(player).sendMessage(org.mockito.ArgumentMatchers.<String>argThat(
             message -> message.contains("Pocket Base 1")
+                && message.contains("type=void/the_void")
                 && message.contains("mob spawning=disabled")
         ));
     }

src/test/java/games/dmg/spigotbase/PluginSettingsTest.java

@@ -25,6 +25,8 @@ final class PluginSettingsTest {
         assertEquals(16, settings.pocketBaseUpgradeCost());
         assertEquals("DIAMOND_BLOCK", settings.pocketBaseCurrencyMaterial());
         assertEquals("DIAMOND_BLOCK", settings.pocketBasePortalFrameMaterial());
+        assertEquals(16, settings.pocketBaseBiomeChangeCost());
+        assertEquals("NETHERITE_BLOCK", settings.pocketBaseBiomeCurrencyMaterial());
     }
 
     @Test
@@ -33,13 +35,17 @@ final class PluginSettingsTest {
             "pocket-base-unlock-cost", 32,
             "pocket-base-upgrade-cost", 8,
             "pocket-base-currency-material", "EMERALD_BLOCK",
-            "pocket-base-portal-frame-material", "GOLD_BLOCK"
+            "pocket-base-portal-frame-material", "GOLD_BLOCK",
+            "pocket-base-biome-change-cost", 12,
+            "pocket-base-biome-currency-material", "NETHERITE_INGOT"
         ));
 
         assertEquals(32, settings.pocketBaseUnlockCost());
         assertEquals(8, settings.pocketBaseUpgradeCost());
         assertEquals("EMERALD_BLOCK", settings.pocketBaseCurrencyMaterial());
         assertEquals("GOLD_BLOCK", settings.pocketBasePortalFrameMaterial());
+        assertEquals(12, settings.pocketBaseBiomeChangeCost());
+        assertEquals("NETHERITE_INGOT", settings.pocketBaseBiomeCurrencyMaterial());
     }
 
     @Test

src/test/java/games/dmg/spigotbase/PocketBaseManagerTest.java

@@ -85,6 +85,57 @@ final class PocketBaseManagerTest {
         );
     }
 
+    @Test
+    void persistsBiomeAfterApplyingItToTheUnlockedArea() throws Exception {
+        UUID ownerId = UUID.randomUUID();
+        PocketBaseState current = new PocketBaseState(ownerId, 2, Optional.empty());
+        PocketBaseStateManager states = mock(PocketBaseStateManager.class);
+        PocketBaseWorldService worlds = mock(PocketBaseWorldService.class);
+        when(states.state(ownerId)).thenReturn(current);
+        when(states.updateAndSave(org.mockito.ArgumentMatchers.eq(ownerId),
+            org.mockito.ArgumentMatchers.any())).thenAnswer(invocation -> {
+                @SuppressWarnings("unchecked")
+                UnaryOperator<PocketBaseState> operation = invocation.getArgument(1);
+                return operation.apply(current);
+            });
+        PocketBaseManager manager = new PocketBaseManager(
+            states,
+            worlds,
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        PocketBaseState updated = manager.setBiome(ownerId, PocketBaseBiome.WARPED_FOREST);
+
+        assertEquals(PocketBaseBiome.WARPED_FOREST, updated.biome());
+        InOrder order = inOrder(worlds, states);
+        order.verify(worlds).setBiome(ownerId, 2, PocketBaseBiome.WARPED_FOREST);
+        order.verify(states).updateAndSave(
+            org.mockito.ArgumentMatchers.eq(ownerId), org.mockito.ArgumentMatchers.any()
+        );
+    }
+
+    @Test
+    void restoresPreviousBiomeWhenPersistenceFails() throws Exception {
+        UUID ownerId = UUID.randomUUID();
+        PocketBaseState current = new PocketBaseState(ownerId, 1, Optional.empty());
+        PocketBaseStateManager states = mock(PocketBaseStateManager.class);
+        PocketBaseWorldService worlds = mock(PocketBaseWorldService.class);
+        when(states.state(ownerId)).thenReturn(current);
+        when(states.updateAndSave(org.mockito.ArgumentMatchers.eq(ownerId),
+            org.mockito.ArgumentMatchers.any())).thenThrow(new IOException("save failed"));
+        PocketBaseManager manager = new PocketBaseManager(
+            states,
+            worlds,
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        assertThrows(IOException.class,
+            () -> manager.setBiome(ownerId, PocketBaseBiome.DESERT));
+
+        verify(worlds).setBiome(ownerId, 1, PocketBaseBiome.DESERT);
+        verify(worlds).setBiome(ownerId, 1, PocketBaseBiome.THE_VOID);
+    }
+
     @Test
     void restoresWorldSettingWhenPersistenceFails() throws Exception {
         UUID ownerId = UUID.randomUUID();

src/test/java/games/dmg/spigotbase/PocketBaseWorldServiceTest.java

@@ -31,9 +31,12 @@ final class PocketBaseWorldServiceTest {
         when(server.createWorld(any(WorldCreator.class))).thenReturn(world);
         when(world.getUID()).thenReturn(worldId);
         when(world.getName()).thenReturn("pocket");
+        when(world.getMinHeight()).thenReturn(0);
+        when(world.getMaxHeight()).thenReturn(8);
         PocketBaseWorldService service = new PocketBaseWorldService(
             server,
-            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            ignored -> null
         );
 
         service.expand(ownerId, 0, 1);
@@ -84,7 +87,8 @@ final class PocketBaseWorldServiceTest {
         when(world.getUID()).thenReturn(UUID.randomUUID());
         PocketBaseWorldService service = new PocketBaseWorldService(
             server,
-            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            ignored -> null
         );
 
         service.loadExisting(Map.of(
@@ -95,6 +99,32 @@ final class PocketBaseWorldServiceTest {
         verify(world).setSpawnFlags(true, true);
     }
 
+    @Test
+    void appliesSelectedBiomeAcrossUnlockedColumnsWithoutChangingBlocks() {
+        UUID ownerId = UUID.randomUUID();
+        Server server = mock(Server.class);
+        World world = mock(World.class);
+        when(server.getWorld(org.mockito.ArgumentMatchers.anyString())).thenReturn(world);
+        when(world.getUID()).thenReturn(UUID.randomUUID());
+        when(world.getMinHeight()).thenReturn(0);
+        when(world.getMaxHeight()).thenReturn(8);
+        PocketBaseWorldService service = new PocketBaseWorldService(
+            server,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            ignored -> null
+        );
+
+        service.setBiome(ownerId, 1, PocketBaseBiome.CRIMSON_FOREST);
+
+        verify(world).setBiome(-32, 0, -32, null);
+        verify(world).setBiome(28, 4, 28, null);
+        verify(world, never()).getBlockAt(
+            org.mockito.ArgumentMatchers.anyInt(),
+            org.mockito.ArgumentMatchers.anyInt(),
+            org.mockito.ArgumentMatchers.anyInt()
+        );
+    }
+
     @Test
     void laterLevelAddsRingWithoutOverwritingExistingTerrain() {
         UUID ownerId = UUID.randomUUID();
@@ -104,9 +134,12 @@ final class PocketBaseWorldServiceTest {
         when(server.createWorld(any(WorldCreator.class))).thenReturn(world);
         when(world.getUID()).thenReturn(UUID.randomUUID());
         when(world.getName()).thenReturn("pocket");
+        when(world.getMinHeight()).thenReturn(0);
+        when(world.getMaxHeight()).thenReturn(8);
         PocketBaseWorldService service = new PocketBaseWorldService(
             server,
-            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            ignored -> null
         );
         Block existingCenter = world.getBlockAt(0, 64, 0);
 
@@ -116,6 +149,8 @@ final class PocketBaseWorldServiceTest {
             .setType(Material.GRASS_BLOCK, false);
         verify(existingCenter, never())
             .setType(any(Material.class), org.mockito.ArgumentMatchers.anyBoolean());
+        verify(world).setBiome(44, 4, 44, null);
+        verify(world, never()).setBiome(0, 0, 0, null);
     }
 
     private static Map<BlockPosition, Block> blocks(World world) {

src/test/java/games/dmg/spigotbase/YamlPocketBaseRepositoryTest.java

@@ -29,7 +29,8 @@ final class YamlPocketBaseRepositoryTest {
             Optional.of(new PocketPortalLocation(
                 worldId, "pocket", 20, 65, 12, PocketPortalAxis.Z
             )),
-            true
+            true,
+            PocketBaseBiome.CRIMSON_FOREST
         );
         YamlPocketBaseRepository repository = new YamlPocketBaseRepository(
             temporaryDirectory.resolve("pocket-bases.yml")
@@ -51,5 +52,6 @@ final class YamlPocketBaseRepositoryTest {
 
         assertFalse(loaded.mobSpawningEnabled());
         assertTrue(loaded.returnPortal().isEmpty());
+        assertEquals(PocketBaseBiome.THE_VOID, loaded.biome());
     }
 }