/**
 * Preload file that will be executed in the renderer process.
 * Note: This needs to be attached **prior to imports**, as imports
 * would delay the attachment till after the event has been raised.
 */
document.addEventListener('DOMContentLoaded', () => {
  injectScripts(); // eslint-disable-line @typescript-eslint/no-use-before-define
});

import * as fs from 'fs';
import * as os from 'os';
import * as path from 'path';

import { ipcRenderer } from 'electron';
import { OutputOptions } from '../../shared/src/options/model';

// Do *NOT* add 3rd-party imports here in preload (except for webpack `externals` like electron).
// They will work during development, but break in the prod build :-/ .
// Electron doc isn't explicit about that, so maybe *we*'re doing something wrong.
// At any rate, that's what we have now. If you want an import here, go ahead, but
// verify that apps built with a non-devbuild nativefier (installed from tarball) work.
// Recipe to monkey around this, assuming you git-cloned nativefier in /opt/nativefier/ :
// cd /opt/nativefier/ && rm -f nativefier-43.1.0.tgz && npm run build && npm pack && mkdir -p ~/n4310/ && cd ~/n4310/ \
//    && rm -rf ./* && npm i /opt/nativefier/nativefier-43.1.0.tgz && ./node_modules/.bin/nativefier 'google.com'
// See https://github.com/nativefier/nativefier/issues/1175
// and https://www.electronjs.org/docs/api/browser-window#new-browserwindowoptions / preload

const log = console; // since we can't have `loglevel` here in preload

export const INJECT_DIR = path.join(__dirname, '..', 'inject');

/**
 * Patches window.Notification to:
 * - set a callback on a new Notification
 * - set a callback for clicks on notifications
 * @param createCallback
 * @param clickCallback
 */
function setNotificationCallback(
  createCallback: {
    (title: string, opt: NotificationOptions): void;
    (...args: unknown[]): void;
  },
  clickCallback: { (): void; (this: Notification, ev: Event): unknown },
): void {
  const OldNotify = window.Notification;
  const newNotify = function (
    title: string,
    opt: NotificationOptions,
  ): Notification {
    createCallback(title, opt);
    const instance = new OldNotify(title, opt);
    instance.addEventListener('click', clickCallback);
    return instance;
  };
  newNotify.requestPermission = OldNotify.requestPermission.bind(OldNotify);
  Object.defineProperty(newNotify, 'permission', {
    get: () => OldNotify.permission,
  });

  // @ts-expect-error TypeScript says its not compatible, but it works?
  window.Notification = newNotify;
}

async function getDisplayMedia(
  sourceId: number | string,
): Promise<MediaStream> {
  type OriginalVideoPropertyType = boolean | MediaTrackConstraints | undefined;
  if (!window?.navigator?.mediaDevices) {
    throw Error('window.navigator.mediaDevices is not present');
  }
  // Electron supports an outdated specification for mediaDevices,
  // see https://www.electronjs.org/docs/latest/api/desktop-capturer/
  const stream = await window.navigator.mediaDevices.getUserMedia({
    audio: false,
    video: {
      mandatory: {
        chromeMediaSource: 'desktop',
        chromeMediaSourceId: sourceId,
      },
    } as unknown as OriginalVideoPropertyType,
  });

  return stream;
}

function setupScreenSharePickerStyles(id: string): void {
  const screenShareStyles = document.createElement('style');
  screenShareStyles.id = id;
  screenShareStyles.innerHTML = `
  .desktop-capturer-selection {
    --overlay-color: hsla(0, 0%, 11.8%, 0.75);
    --highlight-color: highlight;
    --text-content-color: #fff;
    --selection-button-color: hsl(180, 1.3%, 14.7%);
  }
  .desktop-capturer-selection {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--overlay-color);
    color: var(--text-content-color);
    z-index: 10000000;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .desktop-capturer-selection__close {
    -moz-appearance: none;
    -webkit-appearance: none;
    appearance: none;
    padding: 1rem;
    color: inherit;
    position: absolute;
    left: 1rem;
    top: 1rem;
    cursor: pointer;
  }
  .desktop-capturer-selection__scroller {
    width: 100%;
    max-height: 100vh;
    overflow-y: auto;
  }
  .desktop-capturer-selection__list {
    max-width: calc(100% - 100px);
    margin: 50px;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    overflow: hidden;
    justify-content: center;
  }
  .desktop-capturer-selection__item {
    display: flex;
    margin: 4px;
  }
  .desktop-capturer-selection__btn {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 145px;
    margin: 0;
    border: 0;
    border-radius: 3px;
    padding: 4px;
    background: var(--selection-button-color);
    text-align: left;
    transition: background-color .15s, box-shadow .15s;
  }
  .desktop-capturer-selection__btn:hover,
  .desktop-capturer-selection__btn:focus {
    background: var(--highlight-color);
  }
  .desktop-capturer-selection__thumbnail {
    width: 100%;
    height: 81px;
    object-fit: cover;
  }
  .desktop-capturer-selection__name {
    margin: 6px 0 6px;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
  }
  @media (prefers-color-scheme: light) {
    .desktop-capturer-selection {
      --overlay-color: hsla(0, 0%, 90.2%, 0.75);
      --text-content-color: hsl(0, 0%, 12.9%);
      --selection-button-color: hsl(180, 1.3%, 85.3%);
    }
  }`;
  document.head.appendChild(screenShareStyles);
}

function setupScreenSharePickerElement(
  id: string,
  sources: Electron.DesktopCapturerSource[],
): void {
  const selectionElem = document.createElement('div');
  selectionElem.classList.add('desktop-capturer-selection');
  selectionElem.id = id;
  selectionElem.innerHTML = `
    <button class="desktop-capturer-selection__close" id="${id}-close" aria-label="Close screen share picker" type="button">
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="32" height="32">
      <path fill="currentColor" d="m12 10.586 4.95-4.95 1.414 1.414-4.95 4.95 4.95 4.95-1.414 1.414-4.95-4.95-4.95 4.95-1.414-1.414 4.95-4.95-4.95-4.95L7.05 5.636z"/>   
      </svg>
    </button>
    <div class="desktop-capturer-selection__scroller">
      <ul class="desktop-capturer-selection__list">
        ${sources
          .map(
            ({ id, name, thumbnail }) => `
          <li class="desktop-capturer-selection__item">
            <button class="desktop-capturer-selection__btn" data-id="${id}" title="${name}">
              <img class="desktop-capturer-selection__thumbnail" src="${thumbnail.toDataURL()}" />
              <span class="desktop-capturer-selection__name">${name}</span>
            </button>
          </li>
        `,
          )
          .join('')}
      </ul>
    </div>
    `;
  document.body.appendChild(selectionElem);
}

function setupScreenSharePicker(
  resolve: (value: MediaStream | PromiseLike<MediaStream>) => void,
  reject: (reason?: unknown) => void,
  sources: Electron.DesktopCapturerSource[],
): void {
  const baseElementsId = 'native-screen-share-picker';
  const pickerStylesElementId = baseElementsId + '-styles';

  setupScreenSharePickerElement(baseElementsId, sources);
  setupScreenSharePickerStyles(pickerStylesElementId);

  const clearElements = (): void => {
    document.getElementById(pickerStylesElementId)?.remove();
    document.getElementById(baseElementsId)?.remove();
  };

  document
    .getElementById(`${baseElementsId}-close`)
    ?.addEventListener('click', () => {
      clearElements();
      reject('Screen share was cancelled by the user.');
    });

  document
    .querySelectorAll('.desktop-capturer-selection__btn')
    .forEach((button) => {
      button.addEventListener('click', () => {
        const id = button.getAttribute('data-id');
        if (!id) {
          log.error("Couldn't find `data-id` of element");
          clearElements();
          return;
        }
        const source = sources.find((source) => source.id === id);
        if (!source) {
          log.error(`Source with id "${id}" does not exist`);
          clearElements();
          return;
        }

        getDisplayMedia(source.id)
          .then((stream) => {
            resolve(stream);
          })
          .catch((err) => {
            log.error('Error selecting desktop capture source:', err);
            reject(err);
          })
          .finally(() => {
            clearElements();
          });
      });
    });
}

function setDisplayMediaPromise(): void {
  // Since no implementation for `getDisplayMedia` exists in Electron we write our own.
  if (!window?.navigator?.mediaDevices) {
    return;
  }
  window.navigator.mediaDevices.getDisplayMedia = (): Promise<MediaStream> => {
    return new Promise((resolve, reject) => {
      const sources = ipcRenderer.invoke(
        'desktop-capturer-get-sources',
      ) as Promise<Electron.DesktopCapturerSource[]>;
      sources
        .then(async (sources) => {
          if (isWayland()) {
            // No documentation is provided wether the first element is always PipeWire-picked or not
            // i.e. maybe it's not deterministic, we are only taking a guess here.
            const stream = await getDisplayMedia(sources[0].id);
            resolve(stream);
          } else {
            setupScreenSharePicker(resolve, reject, sources);
          }
        })
        .catch((err) => {
          reject(err);
        });
    });
  };
}

function injectScripts(): void {
  const needToInject = fs.existsSync(INJECT_DIR);
  if (!needToInject) {
    return;
  }
  // Dynamically require scripts
  try {
    const jsFiles = fs
      .readdirSync(INJECT_DIR, { withFileTypes: true })
      .filter(
        (injectFile) => injectFile.isFile() && injectFile.name.endsWith('.js'),
      )
      .map((jsFileStat) => path.join('..', 'inject', jsFileStat.name));
    for (const jsFile of jsFiles) {
      log.debug('Injecting JS file', jsFile);
      require(jsFile);
    }
  } catch (err: unknown) {
    log.error('Error encoutered injecting JS files', err);
  }
}

function notifyNotificationCreate(
  title: string,
  opt: NotificationOptions,
): void {
  ipcRenderer.send('notification', title, opt);
}
function notifyNotificationClick(): void {
  ipcRenderer.send('notification-click');
}

// @ts-expect-error TypeScript thinks these are incompatible but they aren't
setNotificationCallback(notifyNotificationCreate, notifyNotificationClick);
setDisplayMediaPromise();

ipcRenderer.on('params', (event, message: string) => {
  log.debug('ipcRenderer.params', { event, message });
  const appArgs: unknown = JSON.parse(message) as OutputOptions;
  log.info('nativefier.json', appArgs);
});

ipcRenderer.on('debug', (event, message: string) => {
  log.debug('ipcRenderer.debug', { event, message });
});

// Copy-pastaed as unable to get imports to work in preload.
// If modifying, update also app/src/helpers/helpers.ts
function isWayland(): boolean {
  return (
    isLinux() &&
    (Boolean(process.env.WAYLAND_DISPLAY) ||
      process.env.XDG_SESSION_TYPE === 'wayland')
  );
}

function isLinux(): boolean {
  return os.platform() === 'linux';
}