const { ipcRenderer } = require('electron');
const { toKeyEvent } = require('keyboardevent-from-electron-accelerator');
const keyEventAreEqual = require('keyboardevents-areequal');

const { getSongMenu } = require('../../providers/dom-elements');
const { ElementFromFile, templatePath } = require('../utils');

function $(selector) {
  return document.querySelector(selector);
}

let useNativePiP = false;
let menu = null;
const pipButton = ElementFromFile(
  templatePath(__dirname, 'picture-in-picture.html'),
);

// Will also clone
function replaceButton(query, button) {
  const svg = button.querySelector('#icon svg').cloneNode(true);
  button.replaceWith(button.cloneNode(true));
  button.remove();
  const newButton = $(query);
  newButton.querySelector('#icon').append(svg);
  return newButton;
}

function cloneButton(query) {
  replaceButton(query, $(query));
  return $(query);
}

const observer = new MutationObserver(() => {
  if (!menu) {
    menu = getSongMenu();
    if (!menu) {
      return;
    }
  }

  if (menu.contains(pipButton) || !menu.parentElement.eventSink_?.matches('ytmusic-menu-renderer.ytmusic-player-bar')) {
    return;
  }

  const menuUrl = $(
    'tp-yt-paper-listbox [tabindex="0"] #navigation-endpoint',
  )?.href;
  if (menuUrl && !menuUrl.includes('watch?')) {
    return;
  }

  menu.prepend(pipButton);
});

global.togglePictureInPicture = async () => {
  if (useNativePiP) {
    const isInPiP = document.pictureInPictureElement !== null;
    const video = $('video');
    const togglePiP = () =>
      isInPiP
        ? document.exitPictureInPicture.call(document)
        : video.requestPictureInPicture.call(video);

    try {
      await togglePiP();
      $('#icon').click(); // Close the menu
      return true;
    } catch {
    }
  }

  ipcRenderer.send('picture-in-picture');
  return false;
};

const listenForToggle = () => {
  const originalExitButton = $('.exit-fullscreen-button');
  const appLayout = $('ytmusic-app-layout');
  const expandMenu = $('#expanding-menu');
  const middleControls = $('.middle-controls');
  const playerPage = $('ytmusic-player-page');
  const togglePlayerPageButton = $('.toggle-player-page-button');
  const fullScreenButton = $('.fullscreen-button');
  const player = $('#player');
  const onPlayerDblClick = player.onDoubleClick_;

  const titlebar = $('.cet-titlebar');

  ipcRenderer.on('pip-toggle', (_, isPip) => {
    if (isPip) {
      replaceButton('.exit-fullscreen-button', originalExitButton).addEventListener('click', () => togglePictureInPicture());
      player.onDoubleClick_ = () => {
      };

      expandMenu.addEventListener('mouseleave', () => middleControls.click());
      if (!playerPage.playerPageOpen_) {
        togglePlayerPageButton.click();
      }

      fullScreenButton.click();
      appLayout.classList.add('pip');
      if (titlebar) {
        titlebar.style.display = 'none';
      }
    } else {
      $('.exit-fullscreen-button').replaceWith(originalExitButton);
      player.onDoubleClick_ = onPlayerDblClick;
      expandMenu.onmouseleave = undefined;
      originalExitButton.click();
      appLayout.classList.remove('pip');
      if (titlebar) {
        titlebar.style.display = 'flex';
      }
    }
  });
};

function observeMenu(options) {
  useNativePiP = options.useNativePiP;
  document.addEventListener(
    'apiLoaded',
    () => {
      listenForToggle();

      cloneButton('.player-minimize-button').addEventListener('click', async () => {
        await global.togglePictureInPicture();
        setTimeout(() => $('#player').click());
      });

      // Allows easily closing the menu by programmatically clicking outside of it
      $('#expanding-menu').removeAttribute('no-cancel-on-outside-click');
      // TODO: think about wether an additional button in songMenu is needed
      observer.observe($('ytmusic-popup-container'), {
        childList: true,
        subtree: true,
      });
    },
    { once: true, passive: true },
  );
}

module.exports = (options) => {
  observeMenu(options);

  if (options.hotkey) {
    const hotkeyEvent = toKeyEvent(options.hotkey);
    window.addEventListener('keydown', (event) => {
      if (
        keyEventAreEqual(event, hotkeyEvent)
        && !$('ytmusic-search-box').opened
      ) {
        togglePictureInPicture();
      }
    });
  }
};