/// Support for using `angel_validate` with the Angel Framework.
library angel_validate.server;

import 'package:angel_framework/angel_framework.dart';
import 'angel_validate.dart';
export 'angel_validate.dart';

/// Auto-parses numbers in `req.body`.
RequestMiddleware autoParseBody(List<String> fields) {
  return (RequestContext req, res) async {
    (await req.lazyBody()).addAll(autoParse(req.body, fields));
    return true;
  };
}

/// Auto-parses numbers in `req.query`.
RequestMiddleware autoParseQuery(List<String> fields) {
  return (RequestContext req, res) async {
    req.query.addAll(autoParse(req.query, fields));
    return true;
  };
}

/// Filters unwanted data out of `req.body`.
RequestMiddleware filterBody(Iterable<String> only) {
  return (RequestContext req, res) async {
    var filtered = filter(await req.lazyBody(), only);
    req.body
      ..clear()
      ..addAll(filtered);
    return true;
  };
}

/// Filters unwanted data out of `req.query`.
RequestMiddleware filterQuery(Iterable<String> only) {
  return (RequestContext req, res) async {
    var filtered = filter(req.query, only);
    req.query
      ..clear()
      ..addAll(filtered);
    return true;
  };
}

/// Validates the data in `req.body`, and sets the body to
/// filtered data before continuing the response.
RequestMiddleware validate(Validator validator,
    {String errorMessage: 'Invalid data.'}) {
  return (RequestContext req, res) async {
    var result = validator.check(await req.lazyBody());

    if (result.errors.isNotEmpty) {
      throw new AngelHttpException.badRequest(
          message: errorMessage, errors: result.errors);
    }

    req.body
      ..clear()
      ..addAll(result.data);

    return true;
  };
}

/// Validates the data in `req.query`, and sets the query to
/// filtered data before continuing the response.
RequestMiddleware validateQuery(Validator validator,
    {String errorMessage: 'Invalid data.'}) {
  return (RequestContext req, res) async {
    var result = validator.check(req.query);

    if (result.errors.isNotEmpty) {
      throw new AngelHttpException.badRequest(
          message: errorMessage, errors: result.errors);
    }

    req.query
      ..clear()
      ..addAll(result.data);

    return true;
  };
}

/// Validates the data in `e.data`, and sets the data to
/// filtered data before continuing the service event.
HookedServiceEventListener validateEvent(Validator validator,
    {String errorMessage: 'Invalid data.'}) {
  return (HookedServiceEvent e) {
    var result = validator.check(e.data as Map);

    if (result.errors.isNotEmpty) {
      throw new AngelHttpException.badRequest(
          message: errorMessage, errors: result.errors);
    }

    e.data
      ..clear()
      ..addAll(result.data);
  };
}