import is from '@sindresorhus/is';
import { logger } from '../../logger';
import { ExternalHostError } from '../../types/errors/external-host-error';
import { parseLinkHeader, parseUrl } from '../url';
import type {
  HttpOptions,
  HttpRequestOptions,
  HttpResponse,
  InternalHttpOptions,
} from './types';
import { Http } from '.';

let baseUrl = 'https://gitlab.com/api/v4/';
export const setBaseUrl = (url: string): void => {
  baseUrl = url;
};

export interface GitlabHttpOptions extends HttpOptions {
  paginate?: boolean;
}

export class GitlabHttp extends Http<GitlabHttpOptions> {
  constructor(type = 'gitlab', options?: GitlabHttpOptions) {
    super(type, options);
  }

  protected override async request<T>(
    url: string | URL,
    options?: InternalHttpOptions & GitlabHttpOptions & HttpRequestOptions<T>
  ): Promise<HttpResponse<T>> {
    const opts = {
      baseUrl,
      ...options,
      throwHttpErrors: true,
    };

    try {
      const result = await super.request<T>(url, opts);
      if (opts.paginate && is.array(result.body)) {
        // Check if result is paginated
        try {
          const linkHeader = parseLinkHeader(result.headers.link);
          const nextUrl = linkHeader?.next?.url
            ? parseUrl(linkHeader.next.url)
            : null;
          if (nextUrl) {
            if (process.env.GITLAB_IGNORE_REPO_URL) {
              const defaultEndpoint = new URL(baseUrl);
              nextUrl.protocol = defaultEndpoint.protocol;
              nextUrl.host = defaultEndpoint.host;
            }

            const nextResult = await this.request<T>(nextUrl, opts);
            if (is.array(nextResult.body)) {
              result.body.push(...nextResult.body);
            }
          }
        } catch (err) /* istanbul ignore next */ {
          logger.warn({ err }, 'Pagination error');
        }
      }
      return result;
    } catch (err) {
      if (err.statusCode === 404) {
        logger.trace({ err }, 'GitLab 404');
        logger.debug({ url: err.url }, 'GitLab API 404');
        throw err;
      }
      logger.debug({ err }, 'Gitlab API error');
      if (
        err.statusCode === 429 ||
        (err.statusCode >= 500 && err.statusCode < 600)
      ) {
        throw new ExternalHostError(err, 'gitlab');
      }
      const platformFailureCodes = [
        'EAI_AGAIN',
        'ECONNRESET',
        'ETIMEDOUT',
        'UNABLE_TO_VERIFY_LEAF_SIGNATURE',
      ];
      if (platformFailureCodes.includes(err.code)) {
        throw new ExternalHostError(err, 'gitlab');
      }
      if (err.name === 'ParseError') {
        throw new ExternalHostError(err, 'gitlab');
      }
      throw err;
    }
  }
}