// <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 { Badge, type BadgeTone } from "@hive/shared/badge.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 { 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: BadgeTone; 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,
    sortBy: (h) => h.name,
    filterValue: (h) => h.name,
  },
  {
    key: "domain",
    header: "domain",
    render: (h) =>
      h.domain ? (
        <a href={`https://${h.domain}/`} target="_blank" rel="noreferrer">
          {h.domain}
        </a>
      ) : (
        "—"
      ),
    sortBy: (h) => h.domain ?? "",
    filterValue: (h) => h.domain ?? "",
  },
  {
    key: "status",
    header: "status",
    render: (h) => {
      const { tone, label } = FRESHNESS[h.freshness];
      return (
        <Badge
          tone={tone}
          value={
            h.last_seen_unix !== null ? (
              <>
                {label} (<RelativeTime epochMs={h.last_seen_unix * 1000} />)
              </>
            ) : (
              label
            )
          }
        />
      );
    },
    sortBy: (h) => FRESHNESS[h.freshness].label,
    // Multiselect (not the single-value `"select"` mode) so the operator
    // can filter for e.g. "stale or offline" in one pass rather than one
    // freshness state at a time.
    filterValues: (h) => [FRESHNESS[h.freshness].label],
    filterMode: "multiselect",
  },
];

// 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"
      icon="🐝"
      actions={
        <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}
          storageKey="swarm-ui:hives:table-filters"
        />
      ) : null}
    </Panel>
  );
}