/**
 * Copyright (c) 2021 OpenLens Authors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import type Conf from "conf";
import type { Migrations } from "conf/dist/source/types";
import logger from "../common/logger";
import { ExtendedMap, iter } from "../common/utils";

export function migrationLog(...args: any[]) {
  logger.info(...args);
}

export interface MigrationDeclaration {
  version: string,
  run(store: Conf<any>): void;
}

export function joinMigrations(...declarations: MigrationDeclaration[]): Migrations<any> {
  const migrations = new ExtendedMap<string, ((store: Conf<any>) => void)[]>();

  for (const decl of declarations) {
    migrations.getOrInsert(decl.version, () => []).push(decl.run);
  }

  return Object.fromEntries(
    iter.map(
      migrations,
      ([v, fns]) => [v, (store: Conf<any>) => {
        migrationLog(`Running ${v} migration for ${store.path}`);

        for (const fn of fns) {
          fn(store);
        }
      }],
    ),
  );
}