export type LifecycleStatus = "draft" | "scheduled" | "published" | "archived";

export function slugify(text: string): string {
  return text
    .toLowerCase()
    .normalize("NFKD")
    .replace(/[^a-z0-9\s-]/g, "")
    .replace(/\s+/g, "-")
    .replace(/-+/g, "-")
    .slice(0, 100)
    .replace(/^-|-$/g, "");
}

function stripHtml(html: string): string {
  return html.replace(/<[^>]*>/g, " ").replace(/\s+/g, " ").trim();
}

export function extractH1Title(html: string): string {
  const match = html.match(/<h1\b[^>]*>([\s\S]*?)<\/h1>/i);
  if (!match?.[1]) return "";
  return stripHtml(match[1]).slice(0, 160).trim();
}

export function toDateValue(date?: Date | string | null) {
  if (!date) return "";
  return new Date(date).toISOString().slice(0, 10);
}

export function toTimeValue(date?: Date | string | null) {
  if (!date) return "";
  return new Date(date).toISOString().slice(11, 16);
}

export function combineDateTime(date: string, time: string) {
  if (!date || !time) return undefined;
  return new Date(`${date}T${time}:00`);
}

export function isSchedulingVisible(status: LifecycleStatus) {
  return status === "draft" || status === "scheduled";
}

export function validatePublishInputs(
  status: LifecycleStatus,
  publishDate: string,
  publishTime: string,
) {
  if (!isSchedulingVisible(status)) return null;

  if (status === "scheduled" && (!publishDate || !publishTime)) {
    return "Für den Status Geplant sind Datum und Uhrzeit erforderlich.";
  }

  if ((publishDate && !publishTime) || (!publishDate && publishTime)) {
    return "Bitte Datum und Uhrzeit gemeinsam setzen.";
  }

  return null;
}

export function resolveSubmitStatus(
  status: LifecycleStatus,
  publishDate: string,
  publishTime: string,
) {
  if (status === "draft" && publishDate && publishTime) return "scheduled" as const;
  return status;
}

export function statusLabel(status: LifecycleStatus) {
  if (status === "archived") return "Archiviert";
  if (status === "published") return "Veröffentlicht";
  if (status === "scheduled") return "Geplant";
  return "Entwurf";
}

export function statusClass(status: LifecycleStatus) {
  if (status === "archived") return "bg-gray-200 text-gray-700 dark:bg-neutral-700 dark:text-neutral-300";
  if (status === "published") return "bg-green-50 text-green-700 dark:bg-green-950/50 dark:text-green-400";
  if (status === "scheduled") return "bg-indigo-50 text-indigo-700 dark:bg-indigo-950/50 dark:text-indigo-400";
  return "bg-gray-100 text-gray-500 dark:bg-neutral-700 dark:text-neutral-400";
}