export interface BookFormat {
  id: string;
  name: string;
  widthMm: number;
  heightMm: number;
  description: string;
  typstFormat: string; // filename in typst/formats/ without extension
  minPages: number;
  maxPages: number;
}

export const FORMATS: Record<string, BookFormat> = {
  a7: {
    id: "a7",
    name: "A7 Pocket",
    widthMm: 74,
    heightMm: 105,
    description: "Smallest pocket format — fits in a shirt pocket",
    typstFormat: "a7",
    minPages: 16,
    maxPages: 48,
  },
  a6: {
    id: "a6",
    name: "A6 Booklet",
    widthMm: 105,
    heightMm: 148,
    description: "Standard postcard-sized pocket book",
    typstFormat: "a6",
    minPages: 16,
    maxPages: 64,
  },
  "quarter-letter": {
    id: "quarter-letter",
    name: "Quarter Letter",
    widthMm: 108,
    heightMm: 140,
    description: "Quarter US Letter — easy to print at home",
    typstFormat: "quarter-letter",
    minPages: 16,
    maxPages: 64,
  },
  digest: {
    id: "digest",
    name: 'Digest (5.5" × 8.5")',
    widthMm: 140,
    heightMm: 216,
    description: "Half US Letter — most POD-friendly format",
    typstFormat: "digest",
    minPages: 16,
    maxPages: 96,
  },
};

export function getFormat(id: string): BookFormat | undefined {
  return FORMATS[id];
}

export function listFormats(): BookFormat[] {
  return Object.values(FORMATS);
}