Inceptum/src/main/java/io/gitlab/jfronny/inceptum/gson/MinecraftArgumentDeserializer.java

package io.gitlab.jfronny.inceptum.gson;

import com.google.gson.*;
import io.gitlab.jfronny.inceptum.model.mojang.MinecraftArgument;
import io.gitlab.jfronny.inceptum.model.mojang.Rules;

import java.lang.reflect.Type;
import java.util.LinkedHashSet;
import java.util.Set;

public class MinecraftArgumentDeserializer implements JsonDeserializer<MinecraftArgument> {
    @Override
    public MinecraftArgument deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        if (json.isJsonPrimitive() && json.getAsJsonPrimitive().isString()) {
            return new MinecraftArgument(Set.of(json.getAsString()));
        }
        else if (json.isJsonObject()) {
            JsonObject jo = json.getAsJsonObject();
            if (jo.size() != 2 || !jo.has("rules") || !jo.has("value"))
                throw new JsonParseException("Not a valid minecraft argument");
            Rules r = context.deserialize(jo.get("rules"), Rules.class);
            if (!r.allow()) return new MinecraftArgument(Set.of());
            Set<String> sel = new LinkedHashSet<>();
            JsonElement value = jo.get("value");
            if (value.isJsonArray()) {
                for (JsonElement val : value.getAsJsonArray()) {
                    sel.add(val.getAsString());
                }
            }
            else if (value.isJsonPrimitive())
                sel.add(value.getAsString());
            else throw new JsonParseException("Unexpected value type");
            return new MinecraftArgument(Set.copyOf(sel));
        }
        else throw new JsonParseException("Not a valid minecraft argument");
    }
}