using Xunit;
using ytLive.Services;

namespace ytLive.Tests;

/// <summary>
/// Local recording filename rules (TASK 18): <c>ty-&lt;yyyyMMdd&gt;-&lt;HHmm start&gt;-&lt;hh2mm2 length&gt;.mp4</c>.
/// Recordings start with a <c>0000</c> length placeholder and are renamed on stop.
/// </summary>
public class RecordingFileTests
{
    [Fact]
    public void BuildStartName_UsesDateHourAndMinute_WithZeroLength()
    {
        var start = new DateTime(2026, 8, 29, 14, 5, 0);
        Assert.Equal("ty-20260829-1405-0000", RecordingFile.BuildStartName(start));
    }

    [Fact]
    public void BuildStartName_PadsSingleDigitHourAndMinute()
    {
        var start = new DateTime(2026, 1, 2, 9, 7, 0);
        Assert.Equal("ty-20260102-0907-0000", RecordingFile.BuildStartName(start));
    }

    [Fact]
    public void BuildFinalName_ShortRecording_IsHhmmOfLength()
    {
        var start = new DateTime(2026, 8, 29, 14, 5, 0);
        var length = TimeSpan.FromMinutes(2);
        Assert.Equal("ty-20260829-1405-0002", RecordingFile.BuildFinalName(start, length));
    }

    [Fact]
    public void BuildFinalName_HourAndMinutes_ConcatenatesHh2Mm2()
    {
        var start = new DateTime(2026, 8, 29, 14, 5, 0);
        var length = new TimeSpan(1, 15, 0); // 1h 15m
        Assert.Equal("ty-20260829-1405-0115", RecordingFile.BuildFinalName(start, length));
    }

    [Fact]
    public void BuildFinalName_OverFlowHours_ShowsTotalHours()
    {
        var start = new DateTime(2026, 8, 29, 14, 5, 0);
        var length = new TimeSpan(12, 30, 0); // 12h 30m
        Assert.Equal("ty-20260829-1405-1230", RecordingFile.BuildFinalName(start, length));
    }
}