package org.embeddedt.modernfix.dynresources;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.Maps;
import net.minecraft.client.resources.model.BlockStateModelLoader;
import net.minecraft.client.resources.model.UnbakedModel;
import net.minecraft.resources.FileToIdConverter;
import net.minecraft.resources.Identifier;
import net.minecraft.server.packs.resources.Resource;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.state.BlockState;
import net.neoforged.neoforge.client.model.UnbakedModelParser;
import org.embeddedt.modernfix.ModernFix;
import org.embeddedt.modernfix.common.mixin.perf.dynamic_resources.IdMapperAccessor;

import java.io.Reader;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

public class DynamicModelSystem {
    private static final FileToIdConverter MODEL_LISTER = FileToIdConverter.json("models");
    private static final FileToIdConverter BLOCKSTATE_LISTER = FileToIdConverter.json("blockstates");

    public static final boolean DEBUG_DYNAMIC_MODEL_LOADING = true; // Boolean.getBoolean("modernfix.debugDynamicModelLoading");
    
    public static Map<Identifier, UnbakedModel> createDynamicUnbakedModelMap(Map<Identifier, Resource> resourceMap) {
        LoadingCache<Identifier, UnbakedModel> unbakedModelCache = CacheBuilder.newBuilder().softValues().maximumSize(1000).build(new CacheLoader<>() {
            @Override
            public UnbakedModel load(Identifier key) throws Exception {
                var resource = resourceMap.get(MODEL_LISTER.idToFile(key));
                if (resource == null) {
                    throw new IllegalArgumentException("Model " + key + " does not exist in map");
                }
                if (DEBUG_DYNAMIC_MODEL_LOADING) {
                    ModernFix.LOGGER.info("Loading unbaked model {}", key);
                }
                try (Reader reader = resource.openAsReader()) {
                    return UnbakedModelParser.parse(reader);
                }
            }
        });
        Set<Identifier> unbakedIdSet = resourceMap.keySet().stream().map(MODEL_LISTER::fileToId).collect(Collectors.toUnmodifiableSet());
        return Maps.asMap(unbakedIdSet, key -> key != null ? unbakedModelCache.getUnchecked(key) : null);
    }

    public interface SingleBlockStateEntryLoader {
        BlockStateModelLoader.LoadedModels loadEntry(Identifier identifier, List<Resource> blockstateResources);
    }

    public static BlockStateModelLoader.LoadedModels createDynamicBlockStateLoadedModels(Map<Identifier, List<Resource>> resourceMap, SingleBlockStateEntryLoader entryLoader) {
        LoadingCache<Identifier, BlockStateModelLoader.LoadedModels> definitionCache = CacheBuilder.newBuilder().softValues().maximumSize(1000).build(new CacheLoader<>() {
            @Override
            public BlockStateModelLoader.LoadedModels load(Identifier key) throws Exception {
                if (DEBUG_DYNAMIC_MODEL_LOADING) {
                    ModernFix.LOGGER.info("Loading blockstate definition for {}", key);
                }
                var file = BLOCKSTATE_LISTER.idToFile(key);
                var resources = resourceMap.getOrDefault(file, List.of());
                return entryLoader.loadEntry(file, resources);
            }
        });
        Set<BlockState> allStates = ((IdMapperAccessor<BlockState>)Block.BLOCK_STATE_REGISTRY).getReferenceMap().keySet();
        return new BlockStateModelLoader.LoadedModels(Maps.asMap(allStates, state -> {
            var identifier = state.getBlock().builtInRegistryHolder().getKey().identifier();
            var loadedModels = definitionCache.getUnchecked(identifier);
            return loadedModels.models().get(state);
        }));
    }
}