/** Shared font catalog  safe for client and server bundles (no Node APIs). */

/** Max custom font upload size (10 MB). */
export const FONT_UPLOAD_MAX_BYTES = 10 * 1024 * 1024;

/** Bundled default font for preview + FFmpeg parity (Apache 2.0, Google Arimo). */
export const SYSTEM_FONT = {
  key: "system",
  label: "Arimo",
  file: "Arimo-Regular.ttf",
  boldFile: "Arimo-Bold.ttf",
  previewFamily: "S2VIDPreview-system",
} as const;

export const CURATED_FONTS = [
  {
    key: "inter",
    label: "Inter",
    cssFamily: "Inter",
    googleCss: "Inter:wght@400;600",
    file: "Inter-Regular.ttf",
    boldFile: null as string | null,
  },
  {
    key: "montserrat",
    label: "Montserrat",
    cssFamily: "Montserrat",
    googleCss: "Montserrat:wght@400;600",
    file: "Montserrat-Regular.ttf",
    boldFile: null as string | null,
  },
  {
    key: "roboto",
    label: "Roboto",
    cssFamily: "Roboto",
    googleCss: "Roboto:wght@400;500",
    file: "Roboto-Regular.ttf",
    boldFile: null as string | null,
  },
  {
    key: "oswald",
    label: "Oswald",
    cssFamily: "Oswald",
    googleCss: "Oswald:wght@400;500",
    file: "Oswald-Regular.ttf",
    boldFile: null as string | null,
  },
  {
    key: "playfair",
    label: "Playfair Display",
    cssFamily: "Playfair Display",
    googleCss: "Playfair+Display:wght@400;600",
    file: "PlayfairDisplay-Regular.ttf",
    boldFile: null as string | null,
  },
] as const;

export type CuratedFontKey = (typeof CURATED_FONTS)[number]["key"];
export type WatermarkFontKey = CuratedFontKey | "custom" | "system";

const CURATED_KEYS = new Set<string>(CURATED_FONTS.map((f) => f.key));

export function isCuratedFontKey(v: unknown): v is CuratedFontKey {
  return typeof v === "string" && CURATED_KEYS.has(v);
}

export function isWatermarkFontKey(v: unknown): v is WatermarkFontKey {
  return v === "custom" || v === "system" || isCuratedFontKey(v);
}

/**
 * Escape an absolute font path for use inside an FFmpeg filtergraph `fontfile=` value.
 * Paths are never passed through a shell; this only escapes filter special chars.
 */
export function sanitizeFontfileForFilter(absPath: string): string {
  return absPath
    .replace(/\\/g, "/")
    .replace(/:/g, "\\:")
    .replace(/'/g, "\\'")
    .replace(/\[/g, "\\[")
    .replace(/\]/g, "\\]");
}

export function googleFontsStylesheetUrl(keys: CuratedFontKey[]): string {
  const families = CURATED_FONTS.filter((f) => keys.includes(f.key))
    .map((f) => `family=${f.googleCss}`)
    .join("&");
  return `https://fonts.googleapis.com/css2?${families}&display=swap`;
}