refactor: align custom font class with resource pack definition

src/autogenerated/java/net/onelitefeather/vulpes/font/FontSymbols.java

@@ -4,5 +4,5 @@
  * This class is generated in a later step.
  * Don't add any kind of logic here.
  */
-public sealed interface FontSymbols permits FontSymbol {
+public interface FontSymbols {
 }

src/main/java/net/onelitefeather/vulpes/font/FontSymbol.java

@@ -1,31 +1,76 @@
 package net.onelitefeather.vulpes.font;
 
-import net.onelitefeather.vulpes.registries.VulpesKey;
-import org.jetbrains.annotations.UnmodifiableView;
+import net.minestom.server.codec.Codec;
+import net.minestom.server.codec.StructCodec;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
-public sealed interface FontSymbol extends FontSymbols, VulpesKey permits BitFontSymbol {
+/**
+ * Represents a single font provider entry in a Minecraft resource pack font definition.
+ * <p>
+ * Each instance describes how a set of characters is rendered using a specific font provider
+ * (e.g. bitmap or unicode) as defined in a {@code font.json}.
+ *
+ * @param file   the resource location of the font texture (e.g. "namespace:path/to/file.png")
+ * @param type   the type of the font provider (e.g. "bitmap" or "unicode")
+ * @param ascent the ascent of the glyphs, defining the distance from the baseline to the top
+ * @param height the default height of the glyphs
+ * @param chars  the characters mapped to this provider, typically defining the glyph layout
+ */
+public record FontSymbol(
+        String file,
+        String type,
+        int ascent,
+        int height,
+        List<String> chars
+) {
 
     /**
-     * Returns the symbol ascent.
+     * Codec for serializing and deserializing {@link FontSymbol} instances to and from JSON,
+     * following the structure defined in Minecraft's font provider format.
+     */
+    public static final Codec<FontSymbol> CODEC = StructCodec.struct(
+            "file", Codec.STRING, FontSymbol::file,
+            "type", Codec.STRING, FontSymbol::type,
+            "ascent", Codec.INT, FontSymbol::ascent,
+            "height", Codec.INT, FontSymbol::height,
+            "chars", Codec.STRING.list(), FontSymbol::chars,
+            FontSymbol::new
+    );
+
+    /**
+     * Checks if this font symbol has any characters defined.
      *
-     * @return the ascent
+     * @return true if the chars list is not empty, false otherwise
      */
-    int ascent();
+    public boolean hasChars() {
+        return !chars.isEmpty();
+    }
 
     /**
-     * Returns the symbol height.
+     * Returns the character at the given index.
      *
-     * @return the height
+     * @param index the index of the character
+     * @return the character at the given index or null if the index is out of bounds
      */
-    int height();
+    public @Nullable String getChar(int index) {
+        if (index < 0 || index >= chars.size()) {
+            return null;
+        }
+        return chars.get(index);
+    }
 
     /**
-     * Returns all symbols for the font.
+     * Returns the overwritten character based on the index, otherwise it returns the default value.
      *
-     * @return the symbols
+     * @param index        the index of the character
+     * @param defaultValue the default value
+     * @return the overwritten character or the default value
      */
-    @UnmodifiableView
-    List<String> symbols();
+    public String getCharOr(int index, String defaultValue) {
+        return (index >= 0 && index < this.chars.size())
+                ? this.chars.get(index)
+                : defaultValue;
+    }
 }

src/test/java/net/onelitefeather/vulpes/font/FontSymbolTest.java

@@ -1,6 +1,7 @@
 package net.onelitefeather.vulpes.font;
 
-import net.kyori.adventure.key.Key;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
@@ -9,17 +10,66 @@
 
 class FontSymbolTest {
 
+    private static final String TEST_JSON =
+            """
+                    {
+                      "file": "manis:global/player_ranks/admin.png",
+                      "type": "bitmap",
+                      "ascent": 10,
+                      "height": 10,
+                      "chars": [
+                        ""
+                      ]
+                    }
+                    """;
+
+    private static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
+
+    @Test
+    void testNameTagRead() {
+        FontSymbol tag = new FontSymbol(
+                "manis:global/player_ranks/admin.png",
+                "bitmap",
+                10,
+                10,
+                List.of("\uE120")
+        );
+
+        FontSymbol loadedText = GSON.fromJson(TEST_JSON, FontSymbol.class);
+        assertNotNull(loadedText);
+
+        assertEquals(tag.file(), loadedText.file());
+        assertEquals(tag.type(), loadedText.type());
+        assertEquals(tag.ascent(), loadedText.ascent());
+        assertEquals(tag.height(), loadedText.height());
+        assertEquals(1,  tag.chars().size());
+        assertEquals(tag.chars(), loadedText.chars());
+    }
+
+    @Test
+    void testNameTagMethod() {
+        FontSymbol loadedText = GSON.fromJson(TEST_JSON, FontSymbol.class);
+        assertNotNull(loadedText);
+
+        assertTrue(loadedText.hasChars());
+        assertEquals("\uE120", loadedText.getChar(0));
+        assertEquals("\uE120", loadedText.chars().getFirst());
+
+        assertNull(loadedText.getChar(1));
+        assertNull(loadedText.getChar(-1));
+        assertEquals("\uE000", loadedText.getCharOr(1, "\uE000"));
+        assertEquals("\uE000", loadedText.getCharOr(-1, "\uE000"));
+    }
+
     @Test
-    void testFontCreationWithoutFactory() {
-        Key key = Key.key("vulpes", "test");
-        FontSymbol fontSymbol = new BitFontSymbol(key, 10, 20, List.of("\u12ca"));
-        assertNotNull(fontSymbol);
-        assertInstanceOf(BitFontSymbol.class, fontSymbol);
-
-        assertEquals(key, fontSymbol.key());
-        assertEquals(10, fontSymbol.ascent());
-        assertEquals(20, fontSymbol.height());
-        assertEquals(1, fontSymbol.symbols().size());
-        assertEquals(List.of("\u12ca"), fontSymbol.symbols());
+    void testEmptyChars() {
+        FontSymbol tag = new FontSymbol(
+                "manis:global/player_ranks/admin.png",
+                "bitmap",
+                10,
+                10,
+                List.of()
+        );
+        assertFalse(tag.hasChars());
     }
 }