// <HivesPage> — the hive roster, `/`'s content. Fetches
// swarm-controller's `GET /api/hives/status`, the swarm-wide status
// aggregate: one row per roster hive, freshness derived at read time
// from the status bucket. Supersedes the earlier `GET /api/hives` +
// static "configured" chip placeholder now that the real rollup
// exists — same component, richer data, no rebuild, exactly the plan
// that placeholder's comment laid out. Its own component/file rather
// than living in `App.tsx`, matching `JobsPage`'s shape: `App.tsx` is
// routing, a page owns its own fetch + render.
//
// Polls on a `RefreshIntervalPicker` cadence rather than fetching once
// at mount — no inputs on this page, so a re-fetch clobbering an
// in-progress edit (the hook's stated caller obligation) isn't a live
// concern here.
import { useState } from 'preact/hooks';
import { ApiErrorPanel } from '@hive/shared/api-error-panel.js';
import { readApiError, type ProblemDetails } from '@hive/shared/api-error.js';
import { Panel } from '../ui/panel/Panel.js';
import { RelativeTime } from '../ui/relative-time/RelativeTime.js';
import {
  RefreshIntervalPicker,
  useRefreshInterval,
  type RefreshIntervalMs,
} from '../ui/refresh-interval/RefreshInterval.js';
import { StatusChip, type ChipTone } from '../ui/status-chip/StatusChip.js';
import { Table, type TableColumn } from '../ui/table/Table.js';

type Freshness = 'fresh' | 'stale' | 'never_reported' | 'unknown';

interface HiveStatus {
  name: string;
  domain: string | null;
  freshness: Freshness;
  last_seen_unix: number | null;
  // `age_seconds` (a once-computed-at-fetch age) is part of the wire
  // shape but deliberately unused here — rendering it directly is the
  // exact bug `RelativeTime` exists to fix, so this page recomputes the
  // age client-side from `last_seen_unix` instead.
}

// One tone + label per freshness value. `unknown` (reporting but absent
// from the roster) reads `negative` — it's the one case this endpoint
// cannot vouch for at all, per `status.rs`'s doc comment.
const FRESHNESS: Record<Freshness, { tone: ChipTone; label: string }> = {
  fresh: { tone: 'positive', label: 'fresh' },
  stale: { tone: 'warning', label: 'stale' },
  never_reported: { tone: 'neutral', label: 'never reported' },
  unknown: { tone: 'negative', label: 'unknown' },
};

const COLUMNS: TableColumn<HiveStatus>[] = [
  { key: 'name', header: 'name', render: (h) => h.name },
  {
    key: 'domain',
    header: 'domain',
    render: (h) =>
      h.domain ? (
        <a href={`https://${h.domain}/`} target="_blank" rel="noreferrer">
          {h.domain}
        </a>
      ) : (
        '—'
      ),
  },
  {
    key: 'status',
    header: 'status',
    render: (h) => {
      const { tone, label } = FRESHNESS[h.freshness];
      return (
        <StatusChip
          tone={tone}
          label={
            h.last_seen_unix !== null ? (
              <>
                {label} (<RelativeTime epochMs={h.last_seen_unix * 1000} />)
              </>
            ) : (
              label
            )
          }
        />
      );
    },
  },
];

// 30s default: this page has no inputs to interrupt, and the whole
// point of a refresh-interval control is "no manual reload needed" — an
// operator who wants it off still can, but the out-of-the-box behaviour
// should actually solve the staleness problem rather than require an
// opt-in every visit.
const DEFAULT_INTERVAL_MS: RefreshIntervalMs = 30_000;

export function HivesPage() {
  const [hives, setHives] = useState<HiveStatus[] | null>(null);
  const [error, setError] = useState<ProblemDetails | null>(null);
  const [intervalMs, setIntervalMs] = useState<RefreshIntervalMs>(DEFAULT_INTERVAL_MS);

  useRefreshInterval(intervalMs, () => {
    (async () => {
      const r = await fetch('/api/hives/status');
      if (!r.ok) {
        setError(await readApiError(r));
        return;
      }
      setHives((await r.json()) as HiveStatus[]);
      // A refresh that succeeds clears a previous failure — otherwise a
      // transient error would sit on screen forever after the data
      // itself has recovered.
      setError(null);
    })().catch((e: unknown) => setError({ detail: String(e) }));
  });

  return (
    <Panel title="hives">
      <RefreshIntervalPicker id="hives-refresh" value={intervalMs} onChange={setIntervalMs} />
      {error ? <ApiErrorPanel context="failed to load the hive roster" problem={error} /> : null}
      {!error && hives === null ? <p>loading…</p> : null}
      {hives ? <Table columns={COLUMNS} rows={hives} rowKey={(h) => h.name} /> : null}
    </Panel>
  );
}