import type { BindParams, Database, QueryExecResult } from "sql.js";
import { RpcProvider } from "worker-rpc";
import DbWorker from "./db.worker?worker";
import { dbStatusAtom, jotaiStore } from "../../src/globals";

const worker = new DbWorker();
const rpcProvider = new RpcProvider((message, transfer) =>
  worker.postMessage(message, transfer),
);
worker.onmessage = (e) => rpcProvider.dispatch(e.data);

rpcProvider.registerSignalHandler("db", ({ status }) => {
  jotaiStore.set(dbStatusAtom, (prevState) => ({ ...prevState, status }));
});

interface AsyncDatabase {
  exec(sql: string, params?: BindParams): Promise<QueryExecResult[]>;
  run(sql: string, params?: BindParams): Promise<Database>;
}

export let dbClient: AsyncDatabase;

export async function getDbClient() {
  await new Promise<void>((resolve) => {
    rpcProvider.registerSignalHandler("ready", () => {
      resolve();
    });
  });

  dbClient = {
    async run(s: string, p?: BindParams): Promise<Database> {
      return await rpcProvider.rpc("run", { s, p });
    },
    async exec(s: string, p?: BindParams): Promise<QueryExecResult[]> {
      return await rpcProvider.rpc("exec", { s, p });
    },
  };
}