import type { ReactNode } from "react";
import { useTranslation } from "react-i18next";
import type { LucideIcon } from "lucide-react";
import { X } from "lucide-react";
import { Button } from "./Button";

type BannerTone = "accent" | "warning";

const TONES: Record<BannerTone, { bar: string; icon: string; action: string }> = {
  accent: {
    bar: "bg-accent/15 border-accent/30",
    icon: "text-accent",
    action: "btn-primary",
  },
  warning: {
    bar: "bg-warn/15 border-warn/30",
    icon: "text-warn",
    action: "btn-warn",
  },
};

// Shared top-of-app notification bar. VersionBanner and DemoBanner are thin wrappers over this;
// a future news-ticker variant can build on the same shell (rotating content as children).
export default function Banner({
  tone,
  icon: Icon,
  children,
  action,
  onDismiss,
  dismissTitle,
  role,
}: {
  tone: BannerTone;
  icon: LucideIcon;
  children: ReactNode;
  action?: { label: string; onClick: () => void };
  onDismiss?: () => void;
  /** Accessible name (and tooltip) for the dismiss button. Optional at the call site; the component
   *  falls back to the generic "Close" rather than shipping an unnamed icon button — a nameless
   *  control is not an acceptable default, and `Button`'s type now says so. */
  dismissTitle?: string;
  /** `"status"` for a bar that APPEARS in response to something the user just did, so a screen
   * reader announces it. Left unset for the permanent bars (demo, version): those are part of the
   * page when it loads, and announcing them on every visit is noise, not information. */
  role?: "status";
}) {
  const { t } = useTranslation();
  const c = TONES[tone];
  return (
    <div
      role={role}
      className={`shrink-0 flex items-center gap-2 px-4 py-2 text-sm border-b text-fg ${c.bar}`}
    >
      <Icon className={`w-4 h-4 shrink-0 ${c.icon}`} />
      <span className="min-w-0">{children}</span>
      {action && (
        <button
          onClick={action.onClick}
          className={`ml-1 px-2.5 py-1 rounded-lg font-semibold transition ${c.action}`}
        >
          {action.label}
        </button>
      )}
      {onDismiss && (
        <Button
          variant="ghost"
          size="icon-sm"
          className="ml-auto"
          onClick={onDismiss}
          title={dismissTitle ?? t("common.close")}
          icon={<X className="w-4 h-4" />}
        />
      )}
    </div>
  );
}