import { Database } from "./database.mjs";
import { PawSQLiteError } from "./pawsqlite_error.mjs";
import { enableDebug } from "./log.mjs";


const adapters = [];


export default {
  open: async function(dbName, options = {}) {
    const adapter = getAdapter(options.adapter);

    let db = new Database(dbName, adapter);
    await db.open();
    return db;
  },
  delete: function(dbName, options = {}) {
    const adapter = getAdapter(options.adapter);

    return adapter.delete(dbName);
  },
  registerAdapter: function(adapter) {
    adapters.push(wrapAdapter(adapter));
  },
  debug: enableDebug,
  Error: PawSQLiteError
};


function wrapAdapter(adapter) {
  const wrapped = {};

  ["name", "open", "close", "delete", "sql"].forEach((prop) => {
    if (!(prop in adapter)) {
      throw new PawSQLiteError(`Invalid adapter: missing property: ${ prop }`);
    }

    if (
      prop === "name" && !(
        typeof adapter[prop] === "string" ||
        adapter[prop] instanceof String
      ) ||
      prop !== "name" && (
        typeof adapter[prop] !== "function"
      )
    ) {
      throw new PawSQLiteError("Invalid adapter: invalid type for property: " +
        prop);
    }

    if (typeof adapter[prop] === "function") {
      wrapped[prop] = async (...args) => {
        try {
          return await adapter[prop](...args);
        } catch (err) {
          throw PawSQLiteError.from(err);
        }
      };
    } else {
      wrapped[prop] = adapter[prop];
    }
  });

  return wrapped;
}


function getAdapter(adapterName) {
  const adapter = adapters.find((a) => a.name === adapterName);

  if (!adapter) {
    throw new PawSQLiteError(`Unknown Adapter: ${adapterName}`);
  }

  return adapter;
}