import type { SubmitFormResult } from '../forms/index.js'
import type { FormNotificationTexts } from './types.js'

/**
 * Maps a submitForm result to the user-facing message, interpolating {field}
 * for validation errors. This is the bridge the frontend uses: it gets a result
 * code from submitForm and the resolved texts from getNotificationTexts, and
 * this turns them into one string to display. Keeping the mapping here means the
 * frontend never hard-codes messages or knows about result codes.
 *
 * Never surfaces raw backend/exception detail — 'error' maps to a friendly
 * generic message, not the thrown error's text (which could leak internals).
 */
export function resolveFormMessage(result: SubmitFormResult, texts: FormNotificationTexts): string {
  if (result.success) {return texts.success}

  switch (result.reason) {
    case 'consent':
      return texts.consent
    case 'not_found':
      return texts.notFound
    case 'rate_limited':
      return texts.rateLimited
    case 'turnstile':
      return texts.turnstile
    case 'validation': {
      // Interpolate {field} with the offending field name when present.
      const field = 'field' in result && result.field ? result.field : ''
      return texts.validation.replace('{field}', field)
    }
    case 'error':
    default:
      return texts.error
  }
}