import { normalizePhone } from '~/utils/formatters/phone'

/** Pattern used for the HTML input `pattern` attribute on phone fields. */
export const PHONE_INPUT_PATTERN = '[0-9+ ]*'

const PHONE_VALIDATION_PATTERN = /^\+?\d{7,15}$/

export type PhoneValidationResult = {
  valid: boolean
  error?: string
}

export const PHONE_VALIDATION_ERROR = 'Numéro de téléphone invalide'

/**
 * Lightweight phone schema mirroring the API used across the app.
 */
export const phoneSchema = {
  pattern: PHONE_VALIDATION_PATTERN,
  message: PHONE_VALIDATION_ERROR,
  validate(value: string): PhoneValidationResult {
    const normalized = normalizePhone(value)
    if (!normalized) {
      // Empty values are considered valid; required-ness is handled by the caller.
      return { valid: true }
    }

    if (PHONE_VALIDATION_PATTERN.test(normalized)) {
      return { valid: true }
    }

    return { valid: false, error: PHONE_VALIDATION_ERROR }
  },
}

export const isPhoneValid = (value: string): boolean => phoneSchema.validate(value).valid