validateSurveyAnswers function

ValidationErrors validateSurveyAnswers(AnswerValues answerValues, List<Question> questions, String locale)

Implementation

ValidationErrors validateSurveyAnswers(
  AnswerValues answerValues,
  List<Question> questions,
  String locale,
) {
  final errors = <int, String>{};

  for (final question in questions) {
    final questionId = question.id;
    if (questionId == null) continue;
    final answer = answerValues[questionId];

    if (question.isRequired) {
      if (answer == null ||
          (answer is String && answer.trim().isEmpty) ||
          (answer is List && answer.isEmpty)) {
        errors[questionId] = FormContentMessages.requiredQuestion(locale);
        continue;
      }
    }

    if (question.type.usesImageUpload) {
      final files = answer is List<String>
          ? answer
          : answer is List
          ? answer.whereType<String>().toList()
          : const <String>[];
      if (question.minSelected != null &&
          files.length < question.minSelected!) {
        errors[questionId] = FormContentMessages.minChoices(
          locale,
          question.minSelected!,
        );
        continue;
      }
      if (question.maxSelected != null &&
          files.length > question.maxSelected!) {
        errors[questionId] = FormContentMessages.maxChoices(
          locale,
          question.maxSelected!,
        );
        continue;
      }
      continue;
    }

    if (answer is String && answer.trim().isNotEmpty) {
      final length = answer.trim().length;
      if (question.minLength != null && length < question.minLength!) {
        errors[questionId] = FormContentMessages.minCharacters(
          locale,
          question.minLength!,
        );
        continue;
      }
      if (question.maxLength != null && length > question.maxLength!) {
        errors[questionId] = FormContentMessages.maxCharacters(
          locale,
          question.maxLength!,
        );
        continue;
      }
    }

    final selected = answer is List<int>
        ? answer
        : answer is int
        ? [answer]
        : const <int>[];
    if (selected.isNotEmpty || question.minSelected != null) {
      if (question.minSelected != null &&
          selected.length < question.minSelected!) {
        errors[questionId] = FormContentMessages.minChoices(
          locale,
          question.minSelected!,
        );
        continue;
      }
      if (question.maxSelected != null &&
          selected.length > question.maxSelected!) {
        errors[questionId] = FormContentMessages.maxChoices(
          locale,
          question.maxSelected!,
        );
      }
    }
  }

  return errors;
}