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/** @jsxImportSource ./jsx */
import {
  derived,
  fragment,
  isReactive,
  type ReactiveOrStatic,
  type NodeChild,
} from "./ef.js";

import { Footer } from "./components/footer.js";
import { Header } from "./components/header.js";
import { Nav, NavItem } from "./components/nav.js";
import { type Route } from "./route.js";

import { notFound } from "./pages/not-found.js";
import { loadDocFile } from "./load-docs.js";

import { cx } from "./app.module.css";

const DOCS_PATTERN = /^\/docs\/(\S+)\/$/;

export function title(text?: string): string {
  return text ? `${text} | ef.js` : "ef.js";
}

export async function route(path: string): Promise<Route> {
  if (DOCS_PATTERN.test(path)) {
    const [, slug] = path.match(DOCS_PATTERN)!;

    const { default: doc, title, outline } = await loadDocFile(slug);
    const docs = await import("./pages/docs.js").then((mod) => mod.docs);

    return docs({ html: doc, title, outline });
  }

  switch (path) {
    case "/":
      return import("./pages/top.js").then((mod) => mod.top);
    case "/download/":
      return import("./pages/downloads.js").then((mod) => mod.downloads);
    default:
      return notFound;
  }
}

export function app(
  $main: ReactiveOrStatic<NodeChild>,
  $outline: ReactiveOrStatic<NodeChild> = null,
): Node {
  const sitenavButton = (
    <button
      class={cx.navButton}
      onClick={() => {
        sitenav.querySelector("a")?.focus();
      }}
    >
      Menu
    </button>
  ) as HTMLButtonElement;

  const sitenav = (
    <Nav
      class={cx.navInner}
      onESC={() => {
        sitenavButton.focus();
      }}
    >
      <NavItem href="/">Top</NavItem>
      <NavItem href="/docs/introduction/">Introduction</NavItem>
      <NavItem href="/download/">Downloads</NavItem>
      <NavItem href="/docs/installation/">Installation</NavItem>
      <NavItem href="/docs/usage/">Usage</NavItem>
      <NavItem href="/docs/api/">API</NavItem>
      <NavItem href="/docs/development/">Development Guide</NavItem>
    </Nav>
  ) as HTMLElement;

  const $hasOutline = derived(() => {
    return !!(isReactive($outline) ? $outline.get() : $outline);
  });

  const $outlineButton = derived(() => {
    if (!$hasOutline.get()) {
      return null;
    }

    return (
      <button
        class={cx.navButton}
        onClick={() => {
          $outlineEl.once()?.querySelector("a")?.focus({
            // Without this, browser try to scroll to offscreen element,
            // which cause sudden viewport scroll
            preventScroll: true,
          });
        }}
      >
        Outline
      </button>
    ) as HTMLButtonElement;
  });

  const $outlineEl = derived(() => {
    if (!$hasOutline.get()) {
      return null;
    }

    return (
      <Nav
        class={cx.navInner}
        onESC={() => {
          $outlineButton.once()?.focus();
        }}
      >
        {$outline}
      </Nav>
    ) as HTMLElement;
  });

  return fragment([
    <Header />,
    <div class={cx.body}>
      <div class={cx.sitenav}>{sitenav}</div>
      <div
        class={cx.navOverlay}
        onClick={() => {
          sitenavButton.focus();
        }}
      />
      <div class={cx.outline}>{$outlineEl}</div>
      <div
        class={cx.navOverlay}
        onClick={() => {
          $outlineButton.once()?.focus();
        }}
      />
      <div class={cx.navButtonWrapper}>
        {sitenavButton}
        {$outlineButton}
      </div>
      <main class={cx.main}>{$main}</main>
      <Footer class={cx.footer} />
    </div>,
  ]);
}