/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import _ from 'lodash';
import type {VersionsOptions} from '@docusaurus/plugin-content-docs';

export function validateVersionName(name: unknown): asserts name is string {
  if (typeof name !== 'string') {
    throw new Error(
      `Versions should be strings. Found type "${typeof name}" for version ${JSON.stringify(
        name,
      )}.`,
    );
  }
  if (!name.trim()) {
    throw new Error(
      `Invalid version name "${name}": version name must contain at least one non-whitespace character.`,
    );
  }
  const errors: [RegExp, string][] = [
    [/[/\\]/, 'should not include slash (/) or backslash (\\)'],
    [/.{33,}/, 'cannot be longer than 32 characters'],
    // eslint-disable-next-line no-control-regex
    [/[<>:"|?*\x00-\x1F]/, 'should be a valid file path'],
    [/^\.\.?$/, 'should not be "." or ".."'],
  ];

  errors.forEach(([pattern, message]) => {
    if (pattern.test(name)) {
      throw new Error(
        `Invalid version name "${name}": version name ${message}.`,
      );
    }
  });
}

export function validateVersionNames(
  names: unknown,
): asserts names is string[] {
  if (!Array.isArray(names)) {
    throw new Error(
      `The versions file should contain an array of version names! Found content: ${JSON.stringify(
        names,
      )}`,
    );
  }

  names.forEach(validateVersionName);
}

/**
 * @throws Throws for one of the following invalid options:
 * - `lastVersion` is non-existent
 * - `versions` includes unknown keys
 * - `onlyIncludeVersions` is empty, contains unknown names, or doesn't include
 * `latestVersion` (if provided)
 */
export function validateVersionsOptions(
  availableVersionNames: string[],
  options: VersionsOptions,
): void {
  const availableVersionNamesMsg = `Available version names are: ${availableVersionNames.join(
    ', ',
  )}`;
  if (
    options.lastVersion &&
    !availableVersionNames.includes(options.lastVersion)
  ) {
    throw new Error(
      `Docs option lastVersion: ${options.lastVersion} is invalid. ${availableVersionNamesMsg}`,
    );
  }
  const unknownVersionConfigNames = _.difference(
    Object.keys(options.versions),
    availableVersionNames,
  );
  if (unknownVersionConfigNames.length > 0) {
    throw new Error(
      `Invalid docs option "versions": unknown versions (${unknownVersionConfigNames.join(
        ',',
      )}) found. ${availableVersionNamesMsg}`,
    );
  }

  if (options.onlyIncludeVersions) {
    if (options.onlyIncludeVersions.length === 0) {
      throw new Error(
        `Invalid docs option "onlyIncludeVersions": an empty array is not allowed, at least one version is needed.`,
      );
    }
    const unknownOnlyIncludeVersionNames = _.difference(
      options.onlyIncludeVersions,
      availableVersionNames,
    );
    if (unknownOnlyIncludeVersionNames.length > 0) {
      throw new Error(
        `Invalid docs option "onlyIncludeVersions": unknown versions (${unknownOnlyIncludeVersionNames.join(
          ',',
        )}) found. ${availableVersionNamesMsg}`,
      );
    }
    if (
      options.lastVersion &&
      !options.onlyIncludeVersions.includes(options.lastVersion)
    ) {
      throw new Error(
        `Invalid docs option "lastVersion": if you use both the "onlyIncludeVersions" and "lastVersion" options, then "lastVersion" must be present in the provided "onlyIncludeVersions" array.`,
      );
    }
  }
}