/**
 * About & Help modal body (spec §01B/§01C).
 *
 * Rendered inside ModalShell — no backdrop, close button, or focus trap here;
 * the shell owns all of that (docs/architecture/03 → Layer 3). This component
 * is pure content: app identity, keyboard shortcuts (§01D), privacy posture
 * (SOUL.md — local-only, no accounts, no telemetry), and acknowledgements of
 * the projects Astrolabe is built on and shaped by.
 */

import type { ReactNode } from 'react';
import { FEEDBACK_EMAIL, feedbackMailtoHref } from '../feedback';
import styles from './AboutModal.module.css';

/** True when the user agent is macOS / iOS — drives the Cmd vs. Ctrl label. */
const isMac = /Mac|iPhone|iPad|iPod/.test(navigator.platform);
const mod = isMac ? '⌘' : 'Ctrl';

/** Keyboard shortcut rows sourced from spec §01D. */
const SHORTCUTS: readonly { keys: string; action: string }[] = [
  { keys: `${mod}+Shift+N`, action: 'Create a new snippet' },
  { keys: `${mod}+K`, action: 'Toggle the Datasets manager' },
  { keys: `${mod}+S`, action: 'Publish the current snippet draft' },
  { keys: `${mod}+,`, action: 'Open editor settings' },
  { keys: 'Esc', action: 'Close the active modal' },
];

/**
 * External acknowledgement link. Opens in a new tab so following a credit never
 * unloads the workspace mid-edit; `rel` isolates the opened context.
 */
function Ack({ href, children }: { href: string; children: ReactNode }) {
  return (
    <a className={styles.link} href={href} target="_blank" rel="noopener noreferrer">
      {children}
    </a>
  );
}

export function AboutModal() {
  return (
    <div className={styles.about}>
      {/* Identity */}
      <section className={styles.section}>
        <h3 className={styles.heading}>Astrolabe</h3>
        <p className={styles.body}>
          v<span className={styles.version}>{__APP_VERSION__}</span>
        </p>
        <p className={styles.body}>
          A local-first workspace for authoring, organizing, and previewing Vega-Lite charts. Edit
          JSON, see the chart update live, and keep a personal library of snippets — with no
          account, no server, and full offline support.
        </p>
      </section>

      {/* Keyboard shortcuts */}
      <section className={styles.section}>
        <h3 className={styles.heading}>Keyboard shortcuts</h3>
        <table className={styles.shortcuts} aria-label="Keyboard shortcuts">
          <tbody>
            {SHORTCUTS.map(({ keys, action }) => (
              <tr key={keys} className={styles.row}>
                <td className={styles.keys}>
                  <kbd className={styles.kbd}>{keys}</kbd>
                </td>
                <td className={styles.action}>{action}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </section>

      {/* Privacy */}
      <section className={styles.section}>
        <h3 className={styles.heading}>Privacy</h3>
        <p className={styles.body}>
          Astrolabe runs entirely in your browser. Your snippets, datasets, and settings are stored
          locally and never leave your machine.
        </p>
        <ul className={styles.list}>
          <li>No account, no sign-in, no server-side storage.</li>
          <li>The app runs no analytics or tracking — no cookies, no telemetry, no profiling.</li>
          <li>
            The only outbound network requests are ones you create: URL-sourced datasets you add
            yourself.
          </li>
          <li>After the first load, the app works fully offline.</li>
          <li>
            Use the header&rsquo;s import / export buttons to move your library between devices.
          </li>
        </ul>
      </section>

      {/* Feedback */}
      <section className={styles.section}>
        <h3 className={styles.heading}>Feedback</h3>
        <p className={styles.body}>
          Found a bug or have an idea? Email{' '}
          <a className={styles.link} href={feedbackMailtoHref()}>
            {FEEDBACK_EMAIL}
          </a>
          .
        </p>
      </section>

      {/* Acknowledgements */}
      <section className={styles.section}>
        <h3 className={styles.heading}>Acknowledgements</h3>
        <p className={styles.body}>Astrolabe stands on the work of many open projects.</p>

        <div className={styles.ackGroup}>
          <h4 className={styles.ackLabel}>Built on</h4>
          <ul className={styles.list}>
            <li>
              <Ack href="https://vega.github.io/vega-lite/">Vega-Lite</Ack>,{' '}
              <Ack href="https://vega.github.io/vega/">Vega</Ack>,{' '}
              <Ack href="https://github.com/vega/vega-embed">vega-embed</Ack>
              <span className={styles.ackNote}> — render every chart</span>
            </li>
            <li>
              <Ack href="https://microsoft.github.io/monaco-editor/">Monaco</Ack>
              <span className={styles.ackNote}> — the JSON editor</span>
            </li>
            <li>
              <Ack href="https://react.dev/">React</Ack>,{' '}
              <Ack href="https://github.com/pmndrs/zustand">Zustand</Ack>,{' '}
              <Ack href="https://vite.dev/">Vite</Ack>
            </li>
          </ul>
        </div>

        <div className={styles.ackGroup}>
          <h4 className={styles.ackLabel}>Chart guidance shaped by</h4>
          <ul className={styles.list}>
            <li>
              <Ack href="https://github.com/uwdata/draco">Draco</Ack>,{' '}
              <Ack href="https://github.com/vega/voyager">Voyager</Ack>
              <span className={styles.ackNote}> — encoding rules</span>
            </li>
            <li>
              <Ack href="https://github.com/Financial-Times/chart-doctor">FT Visual Vocabulary</Ack>
              , <Ack href="https://www.datawrapper.de/">Datawrapper</Ack>
            </li>
            <li>
              <Ack href="https://github.com/vega/lyra">Lyra</Ack>
              <span className={styles.ackNote}> — authoring interactions</span>
            </li>
          </ul>
        </div>

        <div className={styles.ackGroup}>
          <h4 className={styles.ackLabel}>Design informed by</h4>
          <ul className={styles.list}>
            <li>
              <Ack href="https://carbondesignsystem.com/">IBM Carbon</Ack>,{' '}
              <Ack href="https://design-system.service.gov.uk/">GOV.UK</Ack>
            </li>
            <li>
              <Ack href="https://www.w3.org/WAI/ARIA/apg/">WAI-ARIA APG</Ack>,{' '}
              <Ack href="https://www.nngroup.com/">Nielsen Norman</Ack>
            </li>
          </ul>
        </div>

        <div className={styles.ackGroup}>
          <h4 className={styles.ackLabel}>Typography</h4>
          <ul className={styles.list}>
            <li>
              <Ack href="https://github.com/IBM/plex">IBM Plex</Ack> and other open typefaces,
              self-hosted via <Ack href="https://fontsource.org/">Fontsource</Ack>
            </li>
          </ul>
        </div>
      </section>

      {/* Sibling project */}
      <section className={styles.section}>
        <h3 className={styles.heading}>Also from the maker</h3>
        <p className={styles.body}>
          Astrolabe has a sibling: <Ack href="https://syto.app">Syto</Ack>, a workspace for cleaning
          and reshaping data before you chart it. Go take a look.
        </p>
      </section>
    </div>
  );
}