using System;
using System.Collections.Generic;
using Paca.Mobile.Core;
using Xunit;

namespace Paca.Tests.Core;

public class DualSubtitleComposerGateTests
{
    [Fact]
    public void Gate289_DualSubtitleComposer_AlignsOverlappingCues_Simultaneously()
    {
        var primaryCues = new List<SubtitleCue>
        {
            new(10.0, 15.0, "Hello world")
        };
        var secondaryCues = new List<SubtitleCue>
        {
            new(11.0, 14.0, "안녕하세요")
        };

        var composer = new DualSubtitleComposer(primaryCues, secondaryCues);

        // At 12.0s, both are active
        var active = composer.GetActiveDualCue(currentPosSec: 12.0);

        Assert.NotNull(active);
        Assert.Equal("Hello world", active!.PrimaryText);
        Assert.Equal("안녕하세요", active.SecondaryText);
        Assert.True(active.HasDual);
    }

    [Fact]
    public void Gate290_DualSubtitleComposer_HandlesMissingSecondary_Gracefully()
    {
        var primaryCues = new List<SubtitleCue>
        {
            new(10.0, 15.0, "Hello world")
        };
        var secondaryCues = new List<SubtitleCue>
        {
            new(11.0, 14.0, "안녕하세요")
        };

        var composer = new DualSubtitleComposer(primaryCues, secondaryCues);

        // At 10.5s, only primary is active
        var active = composer.GetActiveDualCue(currentPosSec: 10.5);

        Assert.NotNull(active);
        Assert.Equal("Hello world", active!.PrimaryText);
        Assert.Null(active.SecondaryText);
        Assert.False(active.HasDual);
    }

    [Fact]
    public void Gate291_DualSubtitleComposer_StylesSecondarySubtitle_WithSmallerFontToken()
    {
        var style = DualSubtitleComposer.DefaultSecondaryStyle;
        Assert.True(style.FontScale < 1.0, "Secondary subtitle should be slightly smaller (e.g. 0.8x)");
        Assert.False(string.IsNullOrEmpty(style.TextColorHex));
    }

    [Fact]
    public void Gate292_AudioTrackSelector_SelectsPreferredLanguage()
    {
        var tracks = new List<MobileAudioTrack>
        {
            new(0, "ja", "Japanese (Original)"),
            new(1, "en", "English (Dub)"),
            new(2, "ko", "Korean (Dub)")
        };

        var selected = AudioTrackSelector.PickPreferredTrack(tracks, preferredLangCode: "ko");
        Assert.NotNull(selected);
        Assert.Equal(2, selected!.Index);
        Assert.Equal("ko", selected.LanguageCode);

        // Fallback to first if preferred not found
        var fallback = AudioTrackSelector.PickPreferredTrack(tracks, preferredLangCode: "fr");
        Assert.NotNull(fallback);
        Assert.Equal(0, fallback!.Index);
    }
}