package io.gitlab.jfronny.respackopts.gson;

import io.gitlab.jfronny.gson.*;
import io.gitlab.jfronny.muscript.StarScriptIngester;
import io.gitlab.jfronny.muscript.ast.Expr;
import io.gitlab.jfronny.muscript.compiler.Parser;
import io.gitlab.jfronny.respackopts.muscript.ScopeVersion;

import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

public class ExprDeserializer implements JsonDeserializer<Expr<?>> {
    private static final Map<String, Expr<?>> compiledScripts = new HashMap<>();

    @Override
    public Expr<?> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        if (json.isJsonPrimitive() && json.getAsJsonPrimitive().isString()) {
            String s = json.getAsJsonPrimitive().getAsString();
            if (compiledScripts.containsKey(s))
                return compiledScripts.get(s);
            try {
                int v = AttachmentHolder.getAttachedVersion();
                Expr<?> expr = Parser.parse(ScopeVersion.by(v).muScriptVersion, v <= 7
                                ? StarScriptIngester.starScriptToMu(s)
                                : s);
                compiledScripts.put(s, expr);
                return expr;
            } catch (Parser.ParseException e) {
                throw new JsonParseException("Could not create script", e);
            }
        }
        else {
            if (json.isJsonObject()) throw new JsonParseException("Could not parse script: Expected string but got object (did you forget to migrate this rpo to muScript?)");
            throw new JsonParseException("Could not parse script: Expected string");
        }
    }
}