fix(navigation): hide guidance near base

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

@@ -0,0 +1,60 @@
+package games.dmg.spigotbase;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+final class BaseNavigationControllerTest {
+    @Test
+    void showsParticlesOnlyMoreThanTwentyFiveBlocksBeyondBorder() {
+        UUID playerId = UUID.randomUUID();
+        UUID worldId = UUID.randomUUID();
+        PlayerState state = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(2, 0, 0, 0, 0, true, false, false)
+            .withBase(new BaseLocation(worldId, "world", 0, 64, 0, 0, 0), Instant.EPOCH);
+        World world = mock(World.class);
+        when(world.getUID()).thenReturn(worldId);
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getWorld()).thenReturn(world);
+        when(player.getLocation()).thenReturn(new Location(world, 35.5, 64.0, 0.5));
+        Server server = mock(Server.class);
+        doReturn(java.util.List.of(player)).when(server).getOnlinePlayers();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder")).thenReturn(state);
+        PluginSettingsProvider settings = new PluginSettingsProvider(
+            PluginSettings.from(Map.of())
+        );
+
+        new BaseNavigationController(server, stateManager, settings).run();
+
+        verify(player, never()).spawnParticle(
+            eq(Particle.END_ROD), any(Location.class), eq(1),
+            eq(0.0), eq(0.0), eq(0.0), eq(0.0)
+        );
+
+        when(player.getLocation()).thenReturn(new Location(world, 35.51, 64.0, 0.5));
+        new BaseNavigationController(server, stateManager, settings).run();
+
+        verify(player, times(settings.current().navigationParticleCount())).spawnParticle(
+            eq(Particle.END_ROD), any(Location.class), eq(1),
+            eq(0.0), eq(0.0), eq(0.0), eq(0.0)
+        );
+    }
+}

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

@@ -0,0 +1,26 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class BaseNavigationVisibilityTest {
+    private static final BaseLocation BASE = new BaseLocation(
+        UUID.randomUUID(), "world", 0, 64, 0, 0, 0
+    );
+
+    @Test
+    void hidesNavigationAtAndWithinTwentyFiveBlocksBeyondBorder() {
+        assertFalse(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 10, 35.5, 0.5));
+        assertFalse(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 10, 20.5, 0.5));
+    }
+
+    @Test
+    void showsNavigationMoreThanTwentyFiveBlocksBeyondCurrentBorder() {
+        assertTrue(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 10, 35.51, 0.5));
+        assertFalse(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 75, 100.5, 0.5));
+        assertTrue(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 75, 100.51, 0.5));
+    }
+}