// Copyright 2020 Ben Hills and the project contributors. 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:math';

extension IterableExtensions<E> on Iterable<E> {
  Iterable<List<E>> chunk(int size) sync* {
    if (length <= 0) {
      yield [];
      return;
    }

    var skip = 0;

    while (skip < length) {
      final chunk = this.skip(skip).take(size);

      yield chunk.toList(growable: false);

      skip += size;

      if (chunk.length < size) {
        return;
      }
    }
  }
}

extension ExtString on String? {
  String get forceHttps {
    if (this != null) {
      final url = Uri.tryParse(this!);

      if (url == null || !url.isScheme('http')) return this!;
      
      // Don't force HTTPS for localhost or local IP addresses to support self-hosted development
      final host = url.host.toLowerCase();
      if (host == 'localhost' || 
          host == '127.0.0.1' || 
          host.startsWith('10.') || 
          host.startsWith('192.168.') || 
          host.startsWith('172.') ||
          host.endsWith('.local')) {
        return this!;
      }

      return url.replace(scheme: 'https').toString();
    }

    return this ?? '';
  }
}

extension ExtDouble on double {
  double get toTenth {
    var mod = pow(10.0, 1).toDouble();
    return ((this * mod).round().toDouble() / mod);
  }
}