/**
 * `ServerStatusBar` component.
 *
 * Displays a persistent bar at the top of the dashboard showing the
 * fail2ban server health snapshot: connectivity status, version, active
 * jail count, and aggregated ban/failure totals.
 *
 * Polls `GET /api/dashboard/status` every 30 seconds and on window focus
 * via the {@link useServerStatus} hook.
 */

import {
  Badge,
  Button,
  makeStyles,
  Spinner,
  Text,
  tokens,
  Tooltip,
} from "@fluentui/react-components";
import { useCardStyles } from "../components/commonStyles";
import { ArrowClockwiseRegular, ShieldRegular } from "@fluentui/react-icons";
import { useServerStatus } from "../hooks/useServerStatus";

// ---------------------------------------------------------------------------
// Styles
// ---------------------------------------------------------------------------

const useStyles = makeStyles({
  bar: {
    display: "flex",
    alignItems: "center",
    gap: tokens.spacingHorizontalL,
    padding: `${tokens.spacingVerticalS} ${tokens.spacingHorizontalL}`,
    marginBottom: tokens.spacingVerticalL,
    flexWrap: "wrap",
  },
  statusGroup: {
    display: "flex",
    alignItems: "center",
    gap: tokens.spacingHorizontalS,
  },
  statGroup: {
    display: "flex",
    alignItems: "center",
    gap: tokens.spacingHorizontalXS,
  },
  statValue: {
    fontVariantNumeric: "tabular-nums",
    fontWeight: 600,
  },
  spacer: {
    flexGrow: 1,
  },
  errorText: {
    color: tokens.colorPaletteRedForeground1,
    fontSize: "12px",
  },
});

// ---------------------------------------------------------------------------
// Component
// ---------------------------------------------------------------------------

/**
 * Persistent bar displaying fail2ban server health.
 *
 * Render this at the top of the dashboard page (and any page that should
 * show live server status).
 */
export function ServerStatusBar(): React.JSX.Element {
  const styles = useStyles();
  const { status, loading, error, refresh } = useServerStatus();

  const cardStyles = useCardStyles();

  return (
    <div className={`${cardStyles.card} ${styles.bar}`} role="status" aria-label="fail2ban server status">
      {/* ---------------------------------------------------------------- */}
      {/* Online / Offline badge                                           */}
      {/* ---------------------------------------------------------------- */}
      <div className={styles.statusGroup}>
        <ShieldRegular fontSize={16} />
        {loading && !status ? (
          <Spinner size="extra-tiny" label="Checking…" labelPosition="after" />
        ) : (
          <Badge
            appearance="filled"
            color={status?.online ? "success" : "danger"}
            aria-label={status?.online ? "fail2ban online" : "fail2ban offline"}
          >
            {status?.online ? "Online" : "Offline"}
          </Badge>
        )}
      </div>

      {/* ---------------------------------------------------------------- */}
      {/* Version                                                          */}
      {/* ---------------------------------------------------------------- */}
      {status?.version != null && (
        <Tooltip content="BanGUI version" relationship="description">
          <Text size={200} className={styles.statValue}>
            v{status.version}
          </Text>
        </Tooltip>
      )}

      {/* ---------------------------------------------------------------- */}
      {/* Stats (only when online)                                         */}
      {/* ---------------------------------------------------------------- */}
      {status?.online === true && (
        <>
          <Tooltip content="Active jails" relationship="description">
            <div className={styles.statGroup}>
              <Text size={200}>Jails:</Text>
              <Text size={200} className={styles.statValue}>
                {status.active_jails}
              </Text>
            </div>
          </Tooltip>

          <Tooltip content="Currently banned IPs" relationship="description">
            <div className={styles.statGroup}>
              <Text size={200}>Bans:</Text>
              <Text size={200} className={styles.statValue}>
                {status.total_bans}
              </Text>
            </div>
          </Tooltip>

          <Tooltip content="Total failed authentication attempts currently tracked by fail2ban across all active jails" relationship="description">
            <div className={styles.statGroup}>
              <Text size={200}>Failed Attempts:</Text>
              <Text size={200} className={styles.statValue}>
                {status.total_failures}
              </Text>
            </div>
          </Tooltip>
        </>
      )}

      {/* ---------------------------------------------------------------- */}
      {/* Error message                                                    */}
      {/* ---------------------------------------------------------------- */}
      {error != null && (
        <Text className={styles.errorText} aria-live="polite">
          {error}
        </Text>
      )}

      <div className={styles.spacer} />

      {/* ---------------------------------------------------------------- */}
      {/* Refresh button                                                   */}
      {/* ---------------------------------------------------------------- */}
      <Tooltip content="Refresh server status" relationship="label">
        <Button
          appearance="subtle"
          size="small"
          icon={loading ? <Spinner size="extra-tiny" /> : <ArrowClockwiseRegular />}
          onClick={refresh}
          aria-label="Refresh server status"
          disabled={loading}
        />
      </Tooltip>
    </div>
  );
}