Respackopts/src/main/java/io/gitlab/jfronny/respackopts/filters/FileFilterEventImpl.java

package io.gitlab.jfronny.respackopts.filters;

import io.gitlab.jfronny.libjf.ResourcePath;
import io.gitlab.jfronny.libjf.data.manipulation.api.UserResourceEvents;
import io.gitlab.jfronny.respackopts.util.MetaCache;
import io.gitlab.jfronny.respackopts.model.enums.PackCapability;
import io.gitlab.jfronny.respackopts.filters.util.FileExclusionProvider;
import io.gitlab.jfronny.respackopts.filters.util.FileExpansionProvider;
import io.gitlab.jfronny.respackopts.filters.util.FileFallbackProvider;
import net.minecraft.resource.AbstractFileResourcePack;
import net.minecraft.resource.ResourcePack;
import net.minecraft.util.Identifier;

import java.util.HashMap;
import java.util.Map;

public class FileFilterEventImpl {
    private static final Map<Long, Boolean> containsFileWasFallback = new HashMap<>();
    private static boolean containsFileWasFallback() {
        boolean v = FileFilterEventImpl.containsFileWasFallback.getOrDefault(Thread.currentThread().getId(), false);
        containsFileWasFallback(false);
        return v;
    }

    private static void containsFileWasFallback(boolean value) {
        FileFilterEventImpl.containsFileWasFallback.put(Thread.currentThread().getId(), value);
    }

    public static void init() {
        UserResourceEvents.OPEN.register((type, id, previous, pack) -> {
            if (skip(pack)) return previous;
            String name = new ResourcePath(type, id).getName();
            if (pack.contains(type, id)) {
                return containsFileWasFallback()
                        ? FileFallbackProvider.getReplacement(pack, name)
                        : FileExpansionProvider.replace(previous, pack, name);
            }
            else return null;
        });
        UserResourceEvents.FIND_RESOURCE.register((type, namespace, prefix, maxDepth, pathFilter, previous, pack) -> {
            // Warning: the Identifiers here DON'T CONTAIN THE TYPE!
            // Therefore, it needs to be added when calling a method that generates a ResourcePath!
            if (skip(pack)) return previous;
            previous.removeIf(s -> {
                String fileName = type.getDirectory() + "/" + s.getNamespace() + "/" + s.getPath();
                return FileExclusionProvider.fileHidden(pack, fileName) && !FileFallbackProvider.fileHasFallback(pack, fileName);
            });
            // Completion of the path is handled separately here
            FileFallbackProvider.addFallbackResources(pack, previous, namespace, type);
            return previous;
        });
        UserResourceEvents.CONTAINS.register((type, id, previous, pack) -> {
            if (skip(pack)) return previous;
            containsFileWasFallback(false);
            String name = new ResourcePath(type, id).getName();
            if (previous) {
                if (FileExclusionProvider.fileHidden(pack, name)) {
                    if (FileFallbackProvider.fileHasFallback(pack, name)) {
                        containsFileWasFallback(true);
                    } else {
                        return false;
                    }
                }
                return true;
            }
            else {
                if (UserResourceEvents.disable(() -> pack.contains(type, new Identifier(id.getNamespace(), id.getPath() + ".rpo"))) && FileFallbackProvider.fileHasFallback(pack, name)) {
                    containsFileWasFallback(true);
                    return true;
                }
                return false;
            }
        });
    }

    private static boolean skip(ResourcePack pack) {
        return !(pack instanceof AbstractFileResourcePack) || !MetaCache.hasCapability(pack, PackCapability.FileFilter);
    }
}