// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';
import 'dart:math' as math;

import '../entrypoint.dart';
import '../io.dart';
import '../validator.dart';

/// The maximum size of the package to upload (100 MB).
const _maxSize = 100 * 1024 * 1024;

/// A validator that validates that a package isn't too big.
class SizeValidator extends Validator {
  final Future<int> packageSize;

  SizeValidator(Entrypoint entrypoint, this.packageSize) : super(entrypoint);

  @override
  Future validate() {
    return packageSize.then((size) {
      if (size <= _maxSize) return;
      var sizeInMb = (size / math.pow(2, 20)).toStringAsPrecision(4);
      // Current implementation of Package.listFiles skips hidden files
      var ignoreExists = fileExists(entrypoint.root.path('.gitignore'));

      var error = StringBuffer('Your package is $sizeInMb MB. Hosted '
          'packages must be smaller than 100 MB.');

      if (ignoreExists && !entrypoint.root.inGitRepo) {
        error.write(' Your .gitignore has no effect since your project '
            'does not appear to be in version control.');
      } else if (!ignoreExists && entrypoint.root.inGitRepo) {
        error.write(' Consider adding a .gitignore to avoid including '
            'temporary files.');
      }

      errors.add(error.toString());
    });
  }
}