export type FooterBadgeInput = {
  name?: string;
  embedHtml?: string | null;
  imageUrl?: string | null;
  linkUrl?: string | null;
  isActive?: boolean;
  sortOrder?: number;
};

export type ParsedBadgeEmbed = {
  imageUrl: string | null;
  linkUrl: string | null;
};

/** Extract first <a href> + nested/nearby <img src> from pasted badge HTML. */
export function parseBadgeEmbedHtml(html: string): ParsedBadgeEmbed {
  const trimmed = html.trim();
  if (!trimmed) return { imageUrl: null, linkUrl: null };

  const hrefMatch =
    trimmed.match(/<a\b[^>]*\bhref\s*=\s*["']([^"']+)["'][^>]*>/i) ??
    trimmed.match(/href\s*=\s*["']([^"']+)["']/i);
  const srcMatch =
    trimmed.match(/<img\b[^>]*\bsrc\s*=\s*["']([^"']+)["'][^>]*>/i) ??
    trimmed.match(/src\s*=\s*["']([^"']+)["']/i);

  return {
    linkUrl: hrefMatch?.[1]?.trim() || null,
    imageUrl: srcMatch?.[1]?.trim() || null,
  };
}

export function normalizeBadgeFields(input: FooterBadgeInput) {
  const name = (input.name ?? "").trim();
  const embedHtml = input.embedHtml?.trim() || null;
  let imageUrl = input.imageUrl?.trim() || null;
  let linkUrl = input.linkUrl?.trim() || null;

  if (embedHtml) {
    const parsed = parseBadgeEmbedHtml(embedHtml);
    if (!imageUrl && parsed.imageUrl) imageUrl = parsed.imageUrl;
    if (!linkUrl && parsed.linkUrl) linkUrl = parsed.linkUrl;
  }

  return {
    name,
    embedHtml,
    imageUrl,
    linkUrl,
    isActive: input.isActive ?? true,
    sortOrder:
      typeof input.sortOrder === "number" && Number.isFinite(input.sortOrder)
        ? Math.trunc(input.sortOrder)
        : 0,
  };
}

export function validateBadgeFields(fields: ReturnType<typeof normalizeBadgeFields>): string | null {
  if (!fields.name) return "Name is required";
  if (!fields.embedHtml && !fields.imageUrl) {
    return "Provide embed HTML or an image URL";
  }
  if (fields.imageUrl && !fields.linkUrl && !fields.embedHtml) {
    return "Link URL is required when using image URL only";
  }
  return null;
}