import type { ReactNode } from "react";
import { useTranslation } from "react-i18next";
import { Icon, type IconName } from "./Icons";

export function PageHeader({
  eyebrow,
  title,
  description,
  actions,
}: {
  eyebrow: string;
  title: string;
  description?: string;
  actions?: ReactNode;
}) {
  return (
    <header className="page-header">
      <div>
        <p className="page-eyebrow">{eyebrow}</p>
        <h1>{title}</h1>
        {description && <p className="page-description">{description}</p>}
      </div>
      {actions && <div className="page-actions">{actions}</div>}
    </header>
  );
}

export function SectionHeading({
  title,
  description,
  action,
  headingId,
}: {
  title: string;
  description?: string;
  action?: ReactNode;
  headingId?: string;
}) {
  return (
    <div className="section-heading">
      <div>
        <h2 id={headingId}>{title}</h2>
        {description && <p>{description}</p>}
      </div>
      {action}
    </div>
  );
}

export function LoadingState({ label }: { label?: string }) {
  const { t } = useTranslation("common");
  return (
    <div className="state-panel" role="status">
      <span className="spinner" aria-hidden="true" />
      <p>{label ?? t("states.loadingDefault")}</p>
    </div>
  );
}

export function ErrorState({
  message,
  onRetry,
  retryLabel,
}: {
  message: string;
  onRetry?: () => void;
  retryLabel?: string;
}) {
  const { t } = useTranslation("common");
  return (
    <div className="state-panel state-error" role="alert">
      <Icon name="alert" />
      <div>
        <strong>{t("states.errorTitle")}</strong>
        <p>{message}</p>
        {onRetry ? <button type="button" className="button button-secondary state-retry" onClick={onRetry}>{retryLabel ?? t("actions.retry")}</button> : null}
      </div>
    </div>
  );
}

// Shared rendering for describeApiError()'s output: a localized title + explanation +
// optional next step, with the raw backend/network text demoted to a "Technical
// details" disclosure -- never shown as the primary message. See
// frontend/src/api/errorMessages.ts and docs/fleet-ops-final-localization/audit.md.
export function ApiErrorNotice({ error }: { error: import("../api/errorMessages").ApiErrorInfo | null }) {
  const { t } = useTranslation("common");
  if (!error) return null;
  return (
    <div className="error api-error-notice" role="alert">
      <strong>{error.title}</strong>
      <p>{error.explanation}</p>
      {error.nextStep && <p className="api-error-next-step">{error.nextStep}</p>}
      <details className="evidence-disclosure">
        <summary>{t("actions.technicalDetails")}</summary>
        <pre className="evidence-block">{error.technical}</pre>
      </details>
    </div>
  );
}

export function EmptyState({
  icon = "check",
  title,
  detail,
}: {
  icon?: IconName;
  title: string;
  detail: string;
}) {
  return (
    <div className="state-panel state-empty">
      <Icon name={icon} />
      <div><strong>{title}</strong><p>{detail}</p></div>
    </div>
  );
}

export function IntegrationMark({ kind }: { kind: "n8n" | "rag" | "mcp" }) {
  const labels = { n8n: "n8n", rag: "RA", mcp: "MC" };
  return <span className={`integration-mark integration-${kind}`} aria-hidden="true">{labels[kind]}</span>;
}