/**
 * Copyright (C) 2019-2021 Carl Kittelberger <icedream@icedream.pw>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import deprecate from 'util-deprecate';
import { getThumbnailURL } from './thumbnail';
import { RunnerList } from './datatypes/RunnerList';
import { VideoEntry, VideoList } from './datatypes/VideoList';
import { VideoOnDemandIndex } from './datatypes/VideoOnDemandIdentifier';
import sanitizeTitle from './sanitizeTitle';

const upstreamURL = process.env.UPSTREAM_URL;
const upstreamDirectURL = process.env.UPSTREAM_DIRECT_URL || upstreamURL;
// const apiURL = process.env.API_URL || `${upstreamURL}/api`;
const apiDirectURL = process.env.API_DIRECT_URL || `${upstreamDirectURL}/api`;

// TODO - where did the hourglass image go?
const hourglassImage: string = null;

export class HTTPError extends Error {
  response: Response;

  data: any;

  constructor(response: Response, data: any) {
    super(`HTTP server responded with error: ${response.statusText}`);

    this.response = response;
    this.data = data;
  }
}

export async function fetchJson(
  input: RequestInfo,
  init?: RequestInit,
) {
  try {
    const response = await fetch(input, init);

    // if the server replies, there's always some data in json
    // if there's a network error, it will throw at the previous line
    const data = await response.json();

    if (response.ok) {
      return data;
    }

    throw new HTTPError(response, data);
  } catch (error) {
    if (!error.data) {
      error.data = { message: error.message };
    }
    throw error;
  }
}

function legacyMakeThumbnailURLSet(
  thumbnailServerURL: string,
  id: string,
  {
    downloadFileName,
    thumbnails,
  }: VideoEntry,
): { [srcSetSpec: string]: URL } {
  // let relativePaths;

  // If thumbnails were presented by the JSON API, use those
  if (thumbnails) {
    return thumbnails
      .reduce((all, { sourceSize, fileName }) => ({
        ...all,
        [sourceSize]: new URL(fileName, thumbnailServerURL),
      }), {});
  }

  // Generate default set of URLs based on MP4s on the upstream server
  return [96, 96 * 2, 96 * 3]
    .reduce((all, width) => ({
      [`${width}w`]: downloadFileName
        ? getThumbnailURL(thumbnailServerURL, id, downloadFileName)
        : hourglassImage,
    }), {});
}
export const makeThumbnailURLSet = deprecate(legacyMakeThumbnailURLSet, 'makeThumbnailURLSet() is deprecated.');

async function getDirect(relativeURL: string) {
  return fetchJson(`${apiDirectURL}/${relativeURL}`);
}

// async function get(relativeURL: any) {
//   return fetchJson(`${apiURL}/${relativeURL}`);
// }

export async function getIndex(): Promise<VideoOnDemandIndex> {
  return getDirect('index.json');
}

export async function getRunners(): Promise<RunnerList> {
  return getDirect('runners.json');
}

export async function getVideos(id: string): Promise<VideoList> {
  const result: VideoList = await getDirect(`videos/${id}.json`);
  result.videos = result.videos.reduce((all: Array<VideoEntry>, {
    slug,
    title,
    ...video
  }: VideoEntry) => [
    ...all,
    {
      ...video,
      title,
      slug: typeof slug === 'string'
        ? slug
        : sanitizeTitle(title + (
          all.find((v) => v.title === title)
            ? ` ${all.filter((v) => v.title === title).length + 1}`
            : ''
        )),
    },
  ], []);
  return result;
}

export function getDownloadURL(id: string, fileName: string): string {
  return [upstreamURL, encodeURIComponent(id), encodeURIComponent(fileName)]
    .join('/');
}

export function submitPreferences(data: {
  enableDark?: boolean,
  locale?: string,
  volume?: number,
}) {
  const formData = new URLSearchParams();
  if (data.enableDark !== undefined && data.enableDark !== null) {
    formData.append('enableDark', data.enableDark.toString());
  }
  if (data.locale !== undefined && data.locale !== null) {
    formData.append('locale', data.locale);
  }
  if (data.volume !== undefined && data.volume !== null) {
    formData.append('volume', data.volume.toString());
  }

  fetchJson('/api/changePreferences', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: formData,
  });
}