using System.Globalization;
using Elternbeirat.Web.Services;

namespace Elternbeirat.Web.Features.Events;

public partial class EventList
{
    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");

    // Formats the entry's date range for display: a single day, a date with a
    // time, or a span across days.
    private static string Format(Event ev)
    {
        var start = ev.HasTime
            ? ev.Start.ToString("dddd, d. MMMM yyyy, HH:mm", German) + " Uhr"
            : ev.Start.ToString("dddd, d. MMMM yyyy", German);

        if (ev.End is not { } end)
        {
            return start;
        }

        // Same day: append just the end time. Different days: append the full
        // end date.
        if (end.Date == ev.Start.Date)
        {
            return ev.HasTime
                ? start + "–" + end.ToString("HH:mm", German) + " Uhr"
                : start;
        }

        var endText = ev.HasTime
            ? end.ToString("d. MMMM yyyy, HH:mm", German) + " Uhr"
            : end.ToString("d. MMMM yyyy", German);
        return start + " – " + endText;
    }
}