import type React from 'react';
import { useMemo } from 'react';
import { useTranslation } from 'next-i18next';
import { Modal, ModalBody, ModalHeader } from 'reactstrap';

import {
  useShortcutsModalActions,
  useShortcutsModalStatus,
} from '~/states/ui/modal/shortcuts';

import styles from './ShortcutsModal.module.scss';

/**
 * ShortcutsModalSubstance - Presentation component (heavy logic, rendered only when isOpen)
 */
const ShortcutsModalSubstance = (): React.JSX.Element => {
  const { t } = useTranslation();
  const { close } = useShortcutsModalActions();

  // Memoize OS-specific class
  const additionalClassByOs = useMemo(() => {
    const userAgent = window.navigator.userAgent.toLowerCase();
    const isMac = userAgent.indexOf('mac') > -1;
    return isMac ? 'mac' : 'win';
  }, []);

  // Memoize body content (large static JSX)
  const bodyContent = useMemo(() => {
    return (
      <div className="container">
        <div className="row">
          <div className="col-lg-6">
            <h6>
              <strong>{t('modal_shortcuts.global.title')}</strong>
            </h6>

            <ul className="list-unstyled m-0">
              {/* Open/Close shortcut help */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  <span
                    className="text-nowrap"
                    // biome-ignore lint/security/noDangerouslySetInnerHtml: i18n content includes markup
                    dangerouslySetInnerHTML={{
                      __html: t(
                        'modal_shortcuts.global.Open/Close shortcut help',
                      ),
                    }}
                  />
                </div>
                <div className="d-flex align-items-center">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">/</span>
                </div>
              </li>
              {/* Create Page */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.global.Create Page')}
                </div>
                <div>
                  <span className="key">C</span>
                </div>
              </li>
              {/* Edit Page */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.global.Edit Page')}
                </div>
                <div>
                  <span className="key">E</span>
                </div>
              </li>
              {/* Search */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.global.Search')}
                </div>
                <div>
                  <span className="key">/</span>
                </div>
              </li>
              {/* Show Contributors */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  <span
                    className="text-nowrap"
                    // biome-ignore lint/security/noDangerouslySetInnerHtml: i18n content includes markup
                    dangerouslySetInnerHTML={{
                      __html: t('modal_shortcuts.global.Show Contributors'),
                    }}
                  />
                </div>
                <div className="text-start">
                  <a
                    href={t('modal_shortcuts.global.konami_code_url')}
                    target="_blank"
                    rel="noreferrer"
                  >
                    <span className="text-secondary small">
                      {t('modal_shortcuts.global.Konami Code')}
                    </span>
                  </a>
                  <div className="d-flex gap-2 flex-column align-items-start mt-1">
                    <div className="d-flex gap-1">
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_upward
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_upward
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_downward
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_downward
                      </span>
                    </div>
                    <div className="d-flex gap-1">
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_back
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_forward
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_back
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_forward
                      </span>
                    </div>
                    <div className="d-flex gap-1">
                      <span className="key">B</span>
                      <span className="key">A</span>
                    </div>
                  </div>
                </div>
              </li>
              {/* Mirror Mode */}
              <li className="d-flex align-items-center p-3">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.global.MirrorMode')}
                </div>
                <div className="text-start">
                  <a
                    href={t('modal_shortcuts.global.konami_code_url')}
                    target="_blank"
                    rel="noreferrer"
                  >
                    <span className="text-secondary small">
                      {t('modal_shortcuts.global.Konami Code')}
                    </span>
                  </a>
                  <div className="d-flex gap-2 flex-column align-items-start mt-1">
                    <div className="d-flex gap-1">
                      <span className="key">X</span>
                      <span className="key">X</span>
                      <span className="key">B</span>
                      <span className="key">B</span>
                    </div>
                    <div className="d-flex gap-1">
                      <span className="key">A</span>
                      <span className="key">Y</span>
                      <span className="key">A</span>
                      <span className="key">Y</span>
                    </div>
                    <div className="d-flex gap-1">
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_downward
                      </span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_back
                      </span>
                    </div>
                  </div>
                </div>
              </li>
            </ul>
          </div>

          <div className="col-lg-6">
            <h6>
              <strong>{t('modal_shortcuts.editor.title')}</strong>
            </h6>
            <ul className="list-unstyled m-0">
              {/* Search in Editor */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Search in Editor')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">F</span>
                </div>
              </li>
              {/* Save Page */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Save Page')}
                  <span className="small text-secondary ms-1">
                    {t('modal_shortcuts.editor.Only Editor')}
                  </span>
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">S</span>
                </div>
              </li>
              {/* Indent */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Indent')}
                </div>
                <div>
                  <span className="key">Tab</span>
                </div>
              </li>
              {/* Outdent */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Outdent')}
                </div>
                <div className="text-nowrap gap-1">
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Tab</span>
                </div>
              </li>
              {/* Delete Line */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Delete Line')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">K</span>
                </div>
              </li>
              {/* Insert Line */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  <span
                    // biome-ignore lint/security/noDangerouslySetInnerHtml: i18n content includes markup
                    dangerouslySetInnerHTML={{
                      __html: t('modal_shortcuts.editor.Insert Line'),
                    }}
                  />
                  <br />
                  <span className="small text-secondary ms-1">
                    {t('modal_shortcuts.editor.Post Comment')}
                  </span>
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Enter</span>
                </div>
              </li>
              {/* Move Line */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Move Line')}
                </div>
                <div className="text-nowrap">
                  <span className={`key alt-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key material-symbols-outlined fs-5 px-0">
                    arrow_downward
                  </span>
                  <span className="text-secondary mx-2">or</span>
                  <span className="key material-symbols-outlined fs-5 px-0">
                    arrow_upward
                  </span>
                </div>
              </li>
              {/* Copy Line */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Copy Line')}
                </div>
                <div className="text-nowrap">
                  <div className="text-start">
                    <div>
                      <span
                        className={`key alt-key ${additionalClassByOs}`}
                      ></span>
                      <span className="text-secondary mx-2">+</span>
                      <span className="key">Shift</span>
                      <span className="text-secondary ms-2">+</span>
                    </div>
                    <div className="mt-1">
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_downward
                      </span>
                      <span className="text-secondary mx-2">or</span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_upward
                      </span>
                    </div>
                  </div>
                </div>
              </li>
              {/* Multiple Cursors */}
              <li className="d-flex align-items-center p-3">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.editor.Multiple Cursors')}
                </div>
                <div className="text-nowrap">
                  <div className="text-end">
                    <div>
                      <span
                        className={`key cmd-key ${additionalClassByOs}`}
                      ></span>
                      <span className="text-secondary mx-2">+</span>
                      <span
                        className={`key alt-key ${additionalClassByOs}`}
                      ></span>
                      <span className="text-secondary ms-2">+</span>
                    </div>
                    <div className="mt-1">
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_downward
                      </span>
                      <span className="text-secondary mx-2">or</span>
                      <span className="key material-symbols-outlined fs-5 px-0">
                        arrow_upward
                      </span>
                    </div>
                    <span className="small text-secondary">
                      {t('modal_shortcuts.editor.Or Alt Click')}
                    </span>
                  </div>
                </div>
              </li>
            </ul>
          </div>
        </div>

        {/* Format settings section */}
        <div className="row mt-4">
          <div className="col-lg-6">
            <h6>
              <strong>{t('modal_shortcuts.format.title')}</strong>
            </h6>
            <ul className="list-unstyled m-0">
              {/* Bold */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.format.Bold')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">B</span>
                </div>
              </li>
              {/* Italic */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.format.Italic')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">I</span>
                </div>
              </li>
              {/* Strikethrough */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.format.Strikethrough')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">X</span>
                </div>
              </li>
              {/* Code Text */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.format.Code Text')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">C</span>
                </div>
              </li>
              {/* Hyperlink */}
              <li className="d-flex align-items-center p-3">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.format.Hyperlink')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">U</span>
                </div>
              </li>
            </ul>
          </div>

          <div className="col-lg-6">
            <h6>
              <strong>{t('modal_shortcuts.line_settings.title')}</strong>
            </h6>
            <ul className="list-unstyled m-0">
              {/* Simple List */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.line_settings.Numbered List')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">7</span>
                </div>
              </li>
              {/* Numbered List */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.line_settings.Bullet List')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">8</span>
                </div>
              </li>
              {/* Quote */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.line_settings.Quote')}
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">Shift</span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">9</span>
                </div>
              </li>
              {/* Code Block */}
              <li className="d-flex align-items-center p-3 border-bottom">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.line_settings.Code Block')}
                </div>
                <div className="text-nowrap">
                  <div className="text-start">
                    <div>
                      <span
                        className={`key cmd-key ${additionalClassByOs}`}
                      ></span>
                      <span className="text-secondary mx-2">+</span>
                      <span
                        className={`key alt-key ${additionalClassByOs}`}
                      ></span>
                      <span className="text-secondary ms-2">+</span>
                    </div>
                    <div className="mt-1">
                      <span className="key">Shift</span>
                      <span className="text-secondary mx-2">+</span>
                      <span className="key">C</span>
                    </div>
                  </div>
                </div>
              </li>
              {/* Hide comments */}
              <li className="d-flex align-items-center p-3">
                <div className="flex-grow-1">
                  {t('modal_shortcuts.line_settings.Comment Out')}
                  <br />
                  <span className="small text-secondary">
                    {t('modal_shortcuts.line_settings.Comment Out Desc')}
                  </span>
                </div>
                <div className="text-nowrap">
                  <span className={`key cmd-key ${additionalClassByOs}`}></span>
                  <span className="text-secondary mx-2">+</span>
                  <span className="key">/</span>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </div>
    );
  }, [additionalClassByOs, t]);

  return (
    <>
      <ModalHeader tag="h4" toggle={close} className="px-4">
        {t('Shortcuts')}
      </ModalHeader>
      <ModalBody className="p-md-4 mb-3 grw-modal-body-style overflow-auto">
        {bodyContent}
        <div className="mt-4 ps-3">
          {/* TODO: Replace href with the dedicated keyboard shortcuts docs page once published */}
          <a
            href="https://docs.growi.org"
            target="_blank"
            rel="noreferrer"
            className="btn btn-outline-secondary d-inline-flex align-items-center gap-2"
          >
            <span className="material-symbols-outlined fs-5">help</span>
            {t('modal_shortcuts.Other Shortcuts')}
          </a>
        </div>
      </ModalBody>
    </>
  );
};

/**
 * ShortcutsModal - Container component (lightweight, always rendered)
 */
export const ShortcutsModal = (): React.JSX.Element => {
  const status = useShortcutsModalStatus();
  const { close } = useShortcutsModalActions();

  return (
    <Modal
      id="shortcuts-modal"
      size="lg"
      isOpen={status?.isOpened ?? false}
      toggle={close}
      className={`shortcuts-modal ${styles['shortcuts-modal']}`}
    >
      {status?.isOpened && <ShortcutsModalSubstance />}
    </Modal>
  );
};