Respackopts/src/main/java/io/gitlab/jfronny/respackopts/mixin/ResourcePackManagerMixin.java

package io.gitlab.jfronny.respackopts.mixin;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import io.gitlab.jfronny.respackopts.Respackopts;
import io.gitlab.jfronny.respackopts.data.Respackmeta;
import net.minecraft.resource.ResourcePackManager;
import net.minecraft.resource.ResourcePackProfile;
import net.minecraft.resource.ResourceType;
import net.minecraft.util.Identifier;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Shadow;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

@Mixin(ResourcePackManager.class)
public class ResourcePackManagerMixin {
    @Shadow private Map<String, ResourcePackProfile> profiles;

    @Inject(at = @At("TAIL"), method = "scanPacks()V")
    private void scanPacks(CallbackInfo info) {
        profiles.forEach((s, v) -> {
            if (hasMetadata(v, "conf.json")) {
                try {
                    Respackmeta conf = Respackopts.g.fromJson(readMetadata(v, "conf.json", Respackopts.g), Respackmeta.class);
                    if (!Respackopts.boolVals.containsKey(conf.id))
                        Respackopts.boolVals.put(conf.id, new HashMap<>());
                    if (!Respackopts.numVals.containsKey(conf.id))
                        Respackopts.numVals.put(conf.id, new HashMap<>());
                    if (!Respackopts.strVals.containsKey(conf.id))
                        Respackopts.strVals.put(conf.id, new HashMap<>());
                    for (Map.Entry<String, JsonElement> entry : conf.conf.entrySet()) {
                        String n = entry.getKey();
                        if (n.contains(":") || n.contains(".")) {
                            System.err.println(n + " contains invalid characters");
                            continue;
                        }
                        JsonElement e = entry.getValue();
                        if (e.isJsonPrimitive()) {
                            JsonPrimitive p = e.getAsJsonPrimitive();
                            if (p.isBoolean()) {
                                if (!Respackopts.boolVals.get(conf.id).containsKey(n))
                                    Respackopts.boolVals.get(conf.id).put(n, p.getAsBoolean());
                            }
                            else if (p.isNumber()) {
                                if (!Respackopts.numVals.get(conf.id).containsKey(n))
                                    Respackopts.numVals.get(conf.id).put(n, p.getAsDouble());
                            }
                            else if (p.isString()) {
                                if (!Respackopts.strVals.get(conf.id).containsKey(n))
                                    Respackopts.strVals.get(conf.id).put(n, p.getAsString());
                            }
                        }
                        else {
                            System.err.println("[respackopts] Unsupported non-primitive datatype");
                        }
                    }
                    if (Respackopts.metaVersion.equals(conf.version)) {
                        Respackopts.resPackMetas.put(v.getDisplayName().asString(), conf);
                    }
                    else {
                        System.err.println(s + " was not loaded as it specifies a different respackopts version than is installed");
                    }
                } catch (Throwable e) {
                    e.printStackTrace();
                }
            }
        });
        Respackopts.load();
        Respackopts.updateShaders();
        Respackopts.save();
    }

    private boolean hasMetadata(ResourcePackProfile v, String fname) {
        return v.createResourcePack().contains(ResourceType.CLIENT_RESOURCES, new Identifier(Respackopts.ID, fname));
    }

    private JsonObject readMetadata(ResourcePackProfile v, String fname, Gson g) throws IOException {
        InputStream is = v.createResourcePack().open(ResourceType.CLIENT_RESOURCES, new Identifier(Respackopts.ID, fname));
        ByteArrayOutputStream bais = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int length;
        while ((length = is.read(buffer)) != -1) {
            bais.write(buffer, 0, length);
        }
        return g.fromJson(bais.toString(), JsonElement.class).getAsJsonObject();
    }
}