SimpleBroadcastingSystem/BroadcastScheduleMatcher.cs at master · BFNOC/SimpleBroadcastingSystem · GitHub

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using System;
using System.Collections.ObjectModel;
using System.Linq;

namespace WpfApp1
{
    public static class BroadcastScheduleMatcher
    {
        public static (BroadcastItem Item, TimeSpan TimeUntil)? FindNextBroadcast(ObservableCollection<BroadcastItem> items, DateTime now)
        {
            BroadcastItem? nextItem = null;
            TimeSpan minTimeSpan = TimeSpan.MaxValue;
            DayOfWeek dayOfWeek = now.DayOfWeek;

            foreach (var item in items)
            {
                if (!IsDayScheduled(item, dayOfWeek))
                {
                    continue;
                }

                if (!TimeSpan.TryParse(item.TimeString, out TimeSpan scheduledTime))
                {
                    continue;
                }

                DateTime itemTime = new DateTime(
                    now.Year,
                    now.Month,
                    now.Day,
                    scheduledTime.Hours,
                    scheduledTime.Minutes,
                    scheduledTime.Seconds);

                if (itemTime <= now)
                {
                    continue;
                }

                TimeSpan timeSpan = itemTime - now;
                if (timeSpan < minTimeSpan)
                {
                    minTimeSpan = timeSpan;
                    nextItem = item;
                }
            }

            if (nextItem != null)
            {
                return (nextItem, minTimeSpan);
            }

            return null;
        }

        public static BroadcastItem? GetNextBroadcast(ObservableCollection<BroadcastItem> items, DateTime now)
        {
            var nextBroadcast = FindNextBroadcast(items, now);
            if (nextBroadcast.HasValue)
            {
                return nextBroadcast.Value.Item;
            }

            return null;
        }

        public static TimeSpan GetTimeUntilNextBroadcast(BroadcastItem item, DateTime now)
        {
            if (TimeSpan.TryParse(item.TimeString, out TimeSpan scheduledTime))
            {
                DateTime itemTime = new DateTime(
                    now.Year,
                    now.Month,
                    now.Day,
                    scheduledTime.Hours,
                    scheduledTime.Minutes,
                    scheduledTime.Seconds);

                if (itemTime > now)
                {
                    return itemTime - now;
                }
            }

            return TimeSpan.Zero;
        }

        public static bool IsDayScheduled(BroadcastItem item, DayOfWeek dayOfWeek)
        {
            switch (dayOfWeek)
            {
                case DayOfWeek.Monday:
                    return item.Monday;
                case DayOfWeek.Tuesday:
                    return item.Tuesday;
                case DayOfWeek.Wednesday:
                    return item.Wednesday;
                case DayOfWeek.Thursday:
                    return item.Thursday;
                case DayOfWeek.Friday:
                    return item.Friday;
                case DayOfWeek.Saturday:
                    return item.Saturday;
                case DayOfWeek.Sunday:
                    return item.Sunday;
                default:
                    return false;
            }
        }

        public static void SortBroadcastItems(ObservableCollection<BroadcastItem> items)
        {
            var sortedItems = items
                .OrderBy(item => TimeSpan.TryParse(item.TimeString, out var time) ? time : TimeSpan.MaxValue)
                .ThenBy(item => item.TimeString)
                .ToList();

            items.Clear();
            foreach (var item in sortedItems)
            {
                items.Add(item);
            }
        }
    }
}