package org.bukkit;

import static org.junit.jupiter.api.Assertions.*;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import net.minecraft.core.IRegistry;
import net.minecraft.core.registries.Registries;
import net.minecraft.resources.MinecraftKey;
import net.minecraft.resources.ResourceKey;
import org.bukkit.craftbukkit.util.CraftNamespacedKey;
import org.bukkit.inventory.meta.trim.TrimMaterial;
import org.bukkit.inventory.meta.trim.TrimPattern;
import org.bukkit.support.AbstractTestingBase;
import org.junit.jupiter.api.Test;

public class RegistryConstantsTest extends AbstractTestingBase {

    @Test
    public void testTrimMaterial() {
        this.testExcessConstants(TrimMaterial.class, Registry.TRIM_MATERIAL);
        this.testMissingConstants(TrimMaterial.class, Registries.TRIM_MATERIAL);
    }

    @Test
    public void testTrimPattern() {
        this.testExcessConstants(TrimPattern.class, Registry.TRIM_PATTERN);
        this.testMissingConstants(TrimPattern.class, Registries.TRIM_PATTERN);
    }

    private <T extends Keyed> void testExcessConstants(Class<T> clazz, Registry<T> registry) {
        List<NamespacedKey> excessKeys = new ArrayList<>();

        for (Field field : clazz.getFields()) {
            if (field.getType() != clazz || !Modifier.isStatic(field.getModifiers())) {
                continue;
            }

            String name = field.getName();
            NamespacedKey key = NamespacedKey.fromString(name.toLowerCase());
            if (registry.get(key) == null) {
                excessKeys.add(key);
            }

        }

        assertTrue(excessKeys.isEmpty(), excessKeys.size() + " excess constants(s) in " + clazz.getSimpleName() + " that do not exist: " + excessKeys);
    }

    private <T extends Keyed, M> void testMissingConstants(Class<T> clazz, ResourceKey<IRegistry<M>> nmsRegistryKey) {
        List<MinecraftKey> missingKeys = new ArrayList<>();

        IRegistry<M> nmsRegistry = REGISTRY_CUSTOM.registryOrThrow(nmsRegistryKey);
        for (M nmsObject : nmsRegistry) {
            MinecraftKey minecraftKey = nmsRegistry.getKey(nmsObject);

            try {
                @SuppressWarnings("unchecked")
                T bukkitObject = (T) clazz.getField(minecraftKey.getPath().toUpperCase()).get(null);

                assertEquals(minecraftKey, CraftNamespacedKey.toMinecraft(bukkitObject.getKey()), "Keys are not the same for " + minecraftKey);
            } catch (NoSuchFieldException e) {
                missingKeys.add(minecraftKey);
            } catch (Exception e) {
                fail(e.getMessage());
            }
        }

        assertTrue(missingKeys.isEmpty(), "Missing (" + missingKeys.size() + ") constants in " + clazz.getSimpleName() + ": " + missingKeys);
    }
}