// <MetaNav> — the header's meta-nav trigger: a single fixed-size Badge
// (`@hive/shared/icons.js`'s `LinkIcon` — an emoji glyph here can't
// match a neighbouring icon's size/weight on any platform, see that
// file's comment; mara: "agent page link icons is different from
// swarm ui" was this trigger still on the old `🔗` emoji after
// swarm-ui's own link trigger had already moved to the SVG) in the
// pills cluster that opens a popover listing
// stats/screen/forge/config + any `hyperhive.dashboardLinks` extras,
// sourced from the backend's `agent_links()` (the single source of
// truth — same list also feeds the dashboard card's icon strip) — plus
// a `↑ dashboard` back-link, formerly the overflow menu's job (mara:
// "remove rebuild button, move link to dashboards into links menu" —
// the overflow `⋯` trigger existed for exactly two items, dashboard-
// link and rebuild; rebuild's gone outright, the dashboard's own
// R3BU1LD button already covers it, dashboard-link moves here, so
// `OverflowMenu` had nothing left to justify existing and is deleted).
//
// `variant="quiet"` — mara: "link and settings button should not have
// the badge bg". `Badge`'s default filled-pill look is right for a
// status/picker chip, wrong for this icon-only trigger, which should
// read as header chrome. See `@hive/shared/badge.js`'s `BadgeVariant`.

// v1 of this rendered every link inline in the header's title row —
// mara, live: "the login card looks like it is behind the header"
// (a variable-width link list can grow the title row past the fixed
// `--agent-header-h` the rest of the page is offset against — see
// Header.tsx's comment) and "the links should have the same popout as
// the links in the nav bar of swarm-ui." This is that: one quiet icon
// trigger (reuses `@hive/shared`'s `Badge`, icon-only), a popover on
// click, real `<a>` items — not `@hive/shared`'s `Dropdown` (its items
// are always `<button>`s for command dispatch, which would lose real
// link semantics like ctrl/middle-click and "copy link address") —
// but matching its `.ui-dropdown` visual values exactly (see
// MetaNav.css), the same "reuse the values, not the component" call
// `LoginFlow`'s `.login-card` already made for the same reason.
import { useEffect, useRef, useState } from 'preact/hooks';
import { Badge } from '@hive/shared/badge.js';
import { LinkIcon } from '@hive/shared/icons.js';
import type { AgentLink } from '../types.js';
import './MetaNav.css';

export interface MetaNavProps {
  links: AgentLink[];
  forgePublicUrl: string | null;
  /** Absolute base URL of the host dashboard (`resolveDashboardBase`)
   * — the `↑ dashboard` item links to `${dashboardBase}dashboard.html`. */
  dashboardBase: string;
}

export function MetaNav({ links, forgePublicUrl, dashboardBase }: MetaNavProps) {
  const [open, setOpen] = useState(false);
  const rootRef = useRef<HTMLDivElement>(null);

  // Same "outside click or Escape closes" contract as Dropdown/OverflowMenu.
  useEffect(() => {
    if (!open) return;
    function onPointerDown(e: PointerEvent) {
      if (rootRef.current && e.target instanceof Node && !rootRef.current.contains(e.target)) setOpen(false);
    }
    function onKeyDown(e: KeyboardEvent) {
      if (e.key === 'Escape') setOpen(false);
    }
    document.addEventListener('pointerdown', onPointerDown, true);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('pointerdown', onPointerDown, true);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [open]);

  // Same kind -> URL resolution as app.js's old refreshState meta-links
  // loop: `forge` needs `forgePublicUrl` set or the link is dropped
  // entirely (never guessed from `<host>:3000`); `external` is already
  // absolute; `container` is a same-origin path.
  const visible = links.filter((lnk) => lnk.kind !== 'forge' || forgePublicUrl);
  // No early-return-on-empty any more — the dashboard link below is
  // always present, so the trigger always has at least one item.

  return (
    <div class="meta-nav-anchor" ref={rootRef}>
      <Badge
        value={<LinkIcon />}
        title="agent links"
        variant="quiet"
        onClick={() => setOpen((o) => !o)}
        expanded={open}
      />
      {open ? (
        <div class="meta-nav-popover" role="menu" aria-label="agent links">
          <a
            class="meta-nav-item"
            href={`${dashboardBase}dashboard.html`}
            target="_blank"
            rel="noopener"
            role="menuitem"
            onClick={() => setOpen(false)}
          >
            ↑ dashboard
          </a>
          {visible.map((lnk) => {
            const href = lnk.kind === 'forge' ? `${forgePublicUrl}${lnk.url}` : lnk.url;
            return (
              <a
                key={lnk.url}
                class="meta-nav-item"
                href={href}
                target="_blank"
                rel="noopener"
                role="menuitem"
                onClick={() => setOpen(false)}
              >
                {lnk.icon ? (
                  <span aria-hidden="true">{lnk.icon}</span>
                ) : null}
                {lnk.label}
              </a>
            );
          })}
        </div>
      ) : null}
    </div>
  );
}
