using System;
using System.Collections.Generic;
using System.Globalization;

namespace Kreta.Naplo.Domain.V3.Utility
{
    public static class Extensions
    {
        /// UTC:         2016-10-30T20:00:00Z
        /// Local:       2016-10-30T23:00:00+01:00
        /// Unspecified: 2016-10-30T22:00:00
        public static DateTime ToIso8601Utc(this DateTime dt)
            => new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second, dt.Kind).ToUniversalTime();

        /// UTC:         2016-10-30T20:00:00Z
        /// Local:       2016-10-30T23:00:00+01:00
        /// Unspecified: 2016-10-30T22:00:00
        public static string ToIso8601UtcString(this DateTime dt)
            => dt.ToString("yyyy-MM-dd'T'HH:mm:ssK", CultureInfo.InvariantCulture);

        public static IEnumerable<TOutput> ConvertAll<TInput, TOutput>(this IEnumerable<TInput> collection, Converter<TInput, TOutput> converter)
        {
            foreach (TInput item in collection)
            {
                yield return converter.Invoke(item);
            }
        }
    }
}