/*
 * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
 *
 * 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 NON-INFRINGEMENT. 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 { SearchIndex, SearchTransformFn } from "integrations"

/* ----------------------------------------------------------------------------
 * Types
 * ------------------------------------------------------------------------- */

/**
 * Feature flags
 */
export type Feature =
  | "navigation.tabs"                  /* Tabs navigation */
  | "navigation.instant"               /* Instant loading

/* ------------------------------------------------------------------------- */

/**
 * Configuration
 */
export interface Config {
  base: string                         /* Base URL */
  features: Feature[]                  /* Feature flags */
  search: {
    worker: string                     /* Worker URL */
    index?: Promise<SearchIndex>       /* Promise resolving with index */
    transform?: SearchTransformFn      /* Transformation function */
  }
}

/* ----------------------------------------------------------------------------
 * Functions
 * ------------------------------------------------------------------------- */

/**
 * Ensure that the given value is a valid configuration
 *
 * We could use `jsonschema` or any other schema validation framework, but that
 * would just add more bloat to the bundle, so we'll keep it plain and simple.
 *
 * @param config - Configuration
 *
 * @return Test result
 */
export function isConfig(config: any): config is Config {
  return typeof config === "object"
      && typeof config.base === "string"
      && typeof config.features === "object"
      && typeof config.search === "object"
}
