// Admin: the assets volume, the virus scanner, the archive folder (phase 10) and the open alerts (phase 4).
import { useState } from "react";
import { storageApi } from "../../api/storage";
import type { AlertRow } from "../../api/types";
import { errorText, fmtBytes, fmtTime } from "../../lib/format";
import { useLoad } from "../../lib/useLoad";
import { FileLocations } from "./FileLocations";

const whoName = (a: AlertRow["acknowledged_by"]) => (a && typeof a === "object" ? a.display_name : (a ?? ""));

function alertText(a: AlertRow): string {
  if (a.kind === "assets_quota") {
    const pct = Number((a.detail as { pct?: unknown }).pct);
    return Number.isFinite(pct) ? `The assets volume is ${Math.round(pct)}% full.` : "The assets volume is nearly full.";
  }
  return a.subject ? `${a.kind.replace(/_/g, " ")}: ${a.subject}` : a.kind.replace(/_/g, " ");
}

export function StorageTab() {
  const [load, reload] = useLoad((s) => storageApi.storage(s));
  const [alerts, reloadAlerts] = useLoad((s) => storageApi.alerts(s));
  const [busy, setBusy] = useState(false);
  const [msg, setMsg] = useState<{ ok: boolean; text: string } | null>(null);

  const ack = async (id: number) => {
    setBusy(true);
    setMsg(null);
    try {
      await storageApi.ack(id);
      setMsg({ ok: true, text: "Alert acknowledged." });
      reload();
      reloadAlerts();
    } catch (err) {
      setMsg({ ok: false, text: errorText(err) });
    } finally {
      setBusy(false);
    }
  };

  if (load.state === "loading") return <div className="empty slim">Loading</div>;
  if (load.state === "error") return <div className="callout warn">{load.message}</div>;
  const s = load.data;
  const u = s.usage;
  const pct = Math.max(0, Math.min(100, Number(u.pct) || 0));
  const scan = s.clamav;

  return (
    <div className="stack">
      {msg ? (
        <div className={msg.ok ? "callout flush" : "callout warn flush"} role={msg.ok ? "status" : "alert"}>
          {msg.text}
        </div>
      ) : null}

      <section className="panel stack" aria-labelledby="stor-h">
        <h3 id="stor-h">Assets volume</h3>
        <div>
          Used <b>{fmtBytes(u.used)}</b> of <b>{fmtBytes(u.total)}</b> ({Math.round(pct)}%). <span className="muted">{fmtBytes(u.free)} free.</span>
        </div>
        <div
          className="bar usage"
          role="meter"
          aria-label="Assets volume used"
          aria-valuemin={0}
          aria-valuemax={100}
          aria-valuenow={Math.round(pct)}
        >
          <i className={u.warn ? "over" : undefined} style={{ width: `${pct}%` }} />
          <span className="mark" style={{ left: `${s.quota_warn_pct}%` }} aria-hidden="true" />
        </div>
        <div className="small muted">Warning at {s.quota_warn_pct}%.</div>
        {s.alert ? (
          <div className="callout warn flush" role="status">
            <b>{alertText(s.alert)}</b> Raised {fmtTime(s.alert.created_at)}.
            {s.alert.acknowledged_at ? (
              <> Acknowledged {fmtTime(s.alert.acknowledged_at)}{whoName(s.alert.acknowledged_by) ? ` by ${whoName(s.alert.acknowledged_by)}` : ""}.</>
            ) : (
              <>
                {" "}
                <button className="btn sm" type="button" disabled={busy} onClick={() => void ack(s.alert?.id ?? 0)}>
                  Acknowledge
                </button>
              </>
            )}
          </div>
        ) : null}
      </section>

      <section className="panel" aria-label="Virus scanner">
        <b>Virus scanner (ClamAV): </b>
        {!scan.configured ? (
          <span className="muted">Not configured</span>
        ) : (
          <span className={scan.reachable ? "st-ok" : "st-bad"}>
            {scan.host ?? "clamav"}: {scan.reachable ? "reachable" : "not reachable"}
          </span>
        )}
      </section>

      <FileLocations />

      <section className="sec" aria-labelledby="alerts-h">
        <div className="sec-h">
          <h3 id="alerts-h">Open alerts</h3>
        </div>
        {alerts.state === "loading" ? <div className="empty slim">Loading</div> : null}
        {alerts.state === "error" ? <div className="callout warn">{alerts.message}</div> : null}
        {alerts.state === "ok" && !alerts.data.length ? <div className="empty slim">No open alerts.</div> : null}
        {alerts.state === "ok" && alerts.data.length ? (
          <div className="tw">
            <table aria-label="Open alerts">
              <thead>
                <tr>
                  <th>Raised</th>
                  <th>Severity</th>
                  <th>What</th>
                  <th>Acknowledged</th>
                  <th />
                </tr>
              </thead>
              <tbody>
                {alerts.data.map((a) => (
                  <tr key={a.id}>
                    <td className="small mono nowrap">{fmtTime(a.created_at)}</td>
                    <td className="small">{a.severity}</td>
                    <td>{alertText(a)}</td>
                    <td className="small">{a.acknowledged_at ? `${fmtTime(a.acknowledged_at)} ${whoName(a.acknowledged_by)}` : "-"}</td>
                    <td>
                      {a.acknowledged_at ? null : (
                        <button className="btn sm" type="button" disabled={busy} onClick={() => void ack(a.id)}>
                          Acknowledge
                        </button>
                      )}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        ) : null}
      </section>
    </div>
  );
}