/**
 * @file NineRouterUpdate.tsx
 * @description **Update 9router** on the AI Proxy page (every user's; beside
 * Config 9router): a button — dotted when npm has a newer 9router — and a
 * dialog that runs the server's three-step job (`server/lib/nine-router-update.js`):
 * disconnect and shut 9router down, `npm install -g 9router@latest`, start it
 * again hidden (tray, no browser) — the last only when it was running before.
 * The dialog shows why an update cannot run right now (the server's `blocker`,
 * with the command to run by hand when sudo needs a password) and follows the
 * job by polling until it ends. Closing the dialog does not stop the job.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */
import { useCallback, useEffect, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import { ArrowUpCircle, Check, Circle, Copy, Loader2, MinusCircle, X } from "lucide-react";
import { api, type NineRouterUpdateStatus, type NineRouterUpdateStep } from "../../lib/api";
import { copyText } from "../../lib/clipboard";
import { useDialog } from "../../hooks/useDialog";

const POLL_MS = 1000;

function StepIcon({ status }: { status: NineRouterUpdateStep["status"] }) {
  if (status === "running") return <Loader2 className="h-3.5 w-3.5 animate-spin text-accent" />;
  if (status === "done") return <Check className="h-3.5 w-3.5 text-status-success" />;
  if (status === "failed") return <X className="h-3.5 w-3.5 text-status-danger" />;
  if (status === "skipped") return <MinusCircle className="h-3.5 w-3.5 text-fg-muted" />;
  return <Circle className="h-3.5 w-3.5 text-fg-muted" />;
}

export function NineRouterUpdate() {
  const { t } = useTranslation("settings");
  const [status, setStatus] = useState<NineRouterUpdateStatus | null>(null);
  const [open, setOpen] = useState(false);
  const [starting, setStarting] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const dialogRef = useRef<HTMLDivElement>(null);
  useDialog(open, dialogRef, () => setOpen(false));

  const load = useCallback(async (fresh = false) => {
    try {
      setStatus(await api.aiProxies.nineRouterUpdateStatus(fresh));
    } catch (e) {
      setError(e instanceof Error ? e.message : String(e));
    }
  }, []);

  useEffect(() => {
    void load();
  }, [load]);

  const running = status?.job?.status === "running";
  // Follow a running job — also one started from another tab.
  useEffect(() => {
    if (!running) return;
    const timer = window.setInterval(() => void load(), POLL_MS);
    return () => window.clearInterval(timer);
  }, [running, load]);

  const openDialog = () => {
    setError(null);
    setOpen(true);
    void load(true);
  };

  const start = async () => {
    setStarting(true);
    setError(null);
    try {
      const job = await api.aiProxies.nineRouterUpdate();
      setStatus((s) => (s ? { ...s, job } : s));
    } catch (e) {
      setError(e instanceof Error ? e.message : String(e));
      void load(true);
    } finally {
      setStarting(false);
    }
  };

  if (!status?.installed) return null;
  const job = status.job;
  const blocker = status.blocker;

  return (
    <>
      <button
        type="button"
        onClick={openDialog}
        className="relative inline-flex shrink-0 items-center gap-1.5 rounded-lg border border-border bg-surface-2 px-3 py-1.5 text-xs font-medium text-fg-secondary transition-colors hover:border-accent/30 hover:bg-accent/10 hover:text-accent"
      >
        {running ? (
          <Loader2 className="h-3.5 w-3.5 animate-spin" />
        ) : (
          <ArrowUpCircle className="h-3.5 w-3.5" />
        )}
        {t("aiProxy.update9router")}
        {status.updateAvailable && !running && (
          <span
            className="absolute -right-1 -top-1 h-2 w-2 rounded-full bg-accent-solid"
            aria-label={t("aiProxy.update9routerAvailable")}
          />
        )}
      </button>

      {open && (
        <div
          className="fixed inset-0 z-50 flex items-center justify-center bg-surface-0/70 p-4"
          role="presentation"
        >
          <div
            ref={dialogRef}
            role="dialog"
            aria-modal="true"
            aria-labelledby="nine-router-update-title"
            className="max-h-[90vh] w-full max-w-md overflow-y-auto rounded-xl border border-border bg-surface-1 p-5 shadow-xl"
          >
            <h3
              id="nine-router-update-title"
              className="mb-3 text-sm font-semibold text-fg-primary"
            >
              {t("aiProxy.update9router")}
            </h3>

            <dl className="mb-3 grid grid-cols-[auto_1fr] gap-x-3 gap-y-1 text-xs">
              <dt className="text-fg-muted">{t("aiProxy.update9routerCurrent")}</dt>
              <dd className="font-mono text-fg-primary">{status.version ?? "—"}</dd>
              <dt className="text-fg-muted">{t("aiProxy.update9routerLatest")}</dt>
              <dd className="font-mono text-fg-primary">{status.latest ?? "—"}</dd>
              <dt className="text-fg-muted">{t("aiProxy.update9routerState")}</dt>
              <dd className="text-fg-primary">
                {status.running
                  ? status.managedBy === "systemd"
                    ? t("aiProxy.update9routerRunningUnit")
                    : t("aiProxy.update9routerRunning")
                  : t("aiProxy.update9routerStopped")}
              </dd>
            </dl>

            <p className="mb-3 text-[11px] text-fg-muted">
              {status.running
                ? t("aiProxy.update9routerExplain")
                : t("aiProxy.update9routerExplainStopped")}
            </p>

            {job && (
              <ol className="mb-3 space-y-1.5 rounded-md border border-border bg-surface-0 p-3">
                {job.steps.map((s) => (
                  <li key={s.id} className="flex items-start gap-2 text-xs">
                    <span className="mt-0.5">
                      <StepIcon status={s.status} />
                    </span>
                    <span className="min-w-0">
                      <span className="text-fg-primary">
                        {t(`aiProxy.update9routerStep.${s.id}`)}
                      </span>
                      {s.message && (
                        <span className="block break-words text-[11px] text-fg-muted">
                          {s.message}
                        </span>
                      )}
                    </span>
                  </li>
                ))}
              </ol>
            )}
            {job && job.status !== "running" && (
              <p
                className={`mb-3 text-xs ${
                  job.status === "done" ? "text-status-success" : "text-status-danger"
                }`}
              >
                {job.status !== "done"
                  ? t("aiProxy.update9routerFailed")
                  : job.steps.find((s) => s.id === "relaunch")?.status === "skipped"
                    ? t("aiProxy.update9routerDoneStopped", { version: job.to ?? "—" })
                    : t("aiProxy.update9routerDone", { version: job.to ?? "—" })}
              </p>
            )}
            {job?.log && (
              <details className="mb-3">
                <summary className="cursor-pointer text-[11px] text-fg-muted">
                  {t("aiProxy.update9routerLog")}
                </summary>
                <pre className="mt-1 max-h-48 overflow-auto whitespace-pre-wrap rounded-md bg-surface-0 p-2 font-mono text-[10px] text-fg-secondary">
                  {job.log}
                </pre>
              </details>
            )}

            {blocker && !running && blocker.code !== "EUPTODATE" && (
              <div className="mb-3 rounded-md border border-status-warning/40 bg-status-warning/10 px-3 py-2 text-xs text-fg-secondary">
                <p>{blocker.message}</p>
                {blocker.command && (
                  <div className="mt-2 flex items-center gap-2">
                    <code className="min-w-0 flex-1 truncate rounded bg-surface-0 px-2 py-1 font-mono text-[11px]">
                      {blocker.command}
                    </code>
                    <button
                      type="button"
                      onClick={() => void copyText(blocker.command!)}
                      className="shrink-0 rounded p-1 text-fg-muted hover:text-accent"
                      aria-label={t("aiProxy.update9routerCopy")}
                      title={t("aiProxy.update9routerCopy")}
                    >
                      <Copy className="h-3.5 w-3.5" />
                    </button>
                  </div>
                )}
              </div>
            )}
            {blocker?.code === "EUPTODATE" && !running && (
              <p className="mb-3 text-xs text-fg-muted">{t("aiProxy.update9routerUpToDate")}</p>
            )}
            {error && (
              <p className="mb-3 rounded-md border border-status-danger/40 bg-status-danger/10 px-3 py-2 text-xs text-status-danger">
                {error}
              </p>
            )}

            <div className="flex justify-end gap-2">
              <button
                type="button"
                onClick={() => setOpen(false)}
                className="rounded-lg border border-border px-3 py-1.5 text-xs text-fg-secondary hover:bg-surface-2"
              >
                {t("aiProxy.update9routerClose")}
              </button>
              <button
                type="button"
                onClick={() => void start()}
                disabled={Boolean(blocker) || running || starting}
                className="btn-primary inline-flex items-center gap-1.5 px-3 py-1.5 text-xs disabled:opacity-50"
              >
                {(running || starting) && <Loader2 className="h-3.5 w-3.5 animate-spin" />}
                {t("aiProxy.update9routerStart")}
              </button>
            </div>
          </div>
        </div>
      )}
    </>
  );
}