/**
 * Text encoder for ESC/POS printers
 * Strategy: UTF-8 by default, ASCII removes Vietnamese tones
 * Note: UTF-8 encoding always succeeds, but printer may not have UTF-8 fonts
 * User must manually set encoding='ascii' if they see garbled text
 */
import {removeVietnameseTones} from './utils'
import {selectCodepage} from './commands'

/**
 * Encode text for thermal printer
 */
export function encodeVietnamese(
  text: string,
  encoding: 'utf8' | 'ascii',
  codepage?: number,
): {
  bytes: Uint8Array
  codepageCmd: Uint8Array
} {
  const normalizedText = text.normalize('NFC')

  // Custom codepage (advanced users)
  if (codepage !== undefined) {
    const bytes = new TextEncoder().encode(normalizedText)
    const codepageCmd = selectCodepage(codepage)
    return {bytes, codepageCmd}
  }

  // UTF-8: No codepage command needed
  if (encoding === 'utf8') {
    const bytes = new TextEncoder().encode(normalizedText)
    return {bytes, codepageCmd: new Uint8Array(0)}
  }

  // ASCII: Remove Vietnamese tones
  const textWithoutTones = removeVietnameseTones(normalizedText)
  const bytes = new TextEncoder().encode(textWithoutTones)
  return {bytes, codepageCmd: new Uint8Array(0)}
}