/**
 * Printing Constants
 * Standard values and conversions for thermal printing
 */

/**
 * Paper width constants in millimeters
 */
export const PAPER_WIDTH_MM = {
  LABEL_32: 32, // Label printer
  RECEIPT_58: 58, // Standard receipt
  RECEIPT_80: 80, // Wide receipt
} as const

/**
 * Image width in pixels based on paper width
 * Standard DPI for thermal printers: ~203 DPI (8 dots/mm)
 */
export const IMAGE_WIDTH_PIXELS = {
  MM_32: 256, // 32mm × 8 dots/mm = 256px
  MM_58: 384, // 58mm × 8 dots/mm ≈ 384px (standard)
  MM_80: 576, // 80mm × 8 dots/mm ≈ 576px
} as const

/**
 * Text width in characters based on paper width and font type
 *
 * Font A (default): 12×24 dots character matrix
 * Font B (compact): 9×17 dots character matrix (~33% more chars per line)
 *
 * Note: Font A and B may have different typeface designs depending on printer.
 * Some printers use the same typeface (only size differs), while others use
 * different designs (e.g., Font A = regular, Font B = condensed/narrow).
 * Font B always allows more text to fit on each line.
 */
export const TEXT_WIDTH_CHARS = {
  FONT_A: {
    MM_32: 16, // 32mm ÷ 2mm/char ≈ 16 chars
    MM_58: 32, // 58mm ÷ 1.8mm/char ≈ 32 chars
    MM_80: 48, // 80mm ÷ 1.7mm/char ≈ 48 chars
  },
  FONT_B: {
    MM_32: 21, // 32mm ÷ 1.5mm/char ≈ 21 chars (~31% more)
    MM_58: 42, // 58mm ÷ 1.4mm/char ≈ 42 chars (~31% more)
    MM_80: 64, // 80mm ÷ 1.25mm/char ≈ 64 chars (~33% more)
  },
} as const

/**
 * Default values
 */
export const DEFAULTS = {
  PAPER_WIDTH_MM: PAPER_WIDTH_MM.RECEIPT_58,
  IMAGE_WIDTH_PX: IMAGE_WIDTH_PIXELS.MM_58,
  TEXT_WIDTH_CHARS: TEXT_WIDTH_CHARS.FONT_A.MM_58, // Default: Font A on 58mm
} as const