/**
 * The single decision every EDR document makes about its round seal: draw the
 * one uploaded company stamp when one is configured (StampSettingsService), or
 * fall back to the plain text rings the document styles itself.
 *
 * Only the image-vs-text branch and the image overrides live here — each
 * document keeps its own `.seal` geometry (the invoice's seal is absolutely
 * positioned top-right, the warehouse papers' sit inline above the signature
 * lines), so centralizing the source of the stamp does not relayout anything.
 *
 * These helpers are for the HTML/Chromium render path. The hand-built vector
 * fallbacks in styled-pdf.util.ts cannot embed a raster image and continue to
 * draw their vector seal — see InvoiceDocumentService for that caveat.
 */

/** Escape a value for interpolation into HTML text or a quoted attribute. */
function escapeHtml(value: unknown): string {
  return String(value ?? "")
    .replace(/&/g, "&")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&#39;");
}

/**
 * CSS overrides that neutralize a document's own ring/rotation styling when the
 * seal is a real stamp image. Append inside a document's <style> block, after
 * its own `.seal` rules. `selector` is the document's seal class ("seal").
 */
export function sealImageCss(selector = "seal"): string {
  return [
    `.${selector}.${selector}-image { border: none; border-radius: 0; opacity: 1; transform: none; }`,
    `.${selector}.${selector}-image::before { content: none; }`,
    `.${selector} img { max-width: 100%; max-height: 100%; object-fit: contain; }`,
  ].join("\n    ");
}

/**
 * Inner markup for the seal element: the stamp image, or the given text lines
 * wrapped in a <span> (matching the `.seal span { position: relative }` rule
 * the ring-drawing documents rely on).
 *
 * `stampImageUrl` is expected to be a data URL from
 * StampSettingsService.getStampImageUrl(); null renders the text fallback.
 */
export function sealMarkup(
  stampImageUrl: string | null | undefined,
  textLines: string | string[],
): string {
  if (stampImageUrl) {
    return `<img src="${escapeHtml(stampImageUrl)}" alt="Company stamp" />`;
  }
  const lines = Array.isArray(textLines) ? textLines : [textLines];
  return `<span>${lines.map(escapeHtml).join("<br />")}</span>`;
}

/** Class attribute for the seal element — adds the image modifier when stamped. */
export function sealClass(
  stampImageUrl: string | null | undefined,
  selector = "seal",
): string {
  return stampImageUrl ? `${selector} ${selector}-image` : selector;
}