import { Ruleset } from "pico-framework";
import { CachedRuleset, RulesetRegistryLoader } from "./RulesetRegistry";
const krlCompiler = require("krl-compiler");
const krlCompilerVersion = require("krl-compiler/package.json").version;

export function RulesetRegistryLoaderMem(
  fetchKrl: (url: string) => Promise<string>
): RulesetRegistryLoader {
  const urlData: { [url: string]: CachedRuleset } = {};

  return {
    fetchKrl,

    async save(data) {
      urlData[data.url] = data;
    },

    async compileAndLoad(
      url: string,
      krl: string,
      hash: string
    ): Promise<{
      ruleset: Ruleset;
      compiler: { version: string; warnings: any[] };
    }> {
      const out = krlCompiler(krl);
      if (typeof out.rid !== "string") {
        throw new Error("Compile failed, missing rid");
      }

      const ruleset: Ruleset = eval(out.code);

      return {
        ruleset,
        compiler: { version: krlCompilerVersion, warnings: out.warnings },
      };
    },

    async attemptLoad(url: string) {
      return urlData[url] || null;
    },
  };
}