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

namespace Paca.Tests.Core;

public class SubtitleSyncEngineGateTests
{
    [Fact]
    public void Gate261_SubtitleSyncEngine_DetectsSubtitleFiles_InMediaDirectory()
    {
        var tempDir = Path.Combine(Path.GetTempPath(), "paca_sub_test_" + Guid.NewGuid());
        Directory.CreateDirectory(tempDir);
        try
        {
            var videoPath = Path.Combine(tempDir, "video1.mp4");
            File.WriteAllText(videoPath, "dummy video");
            File.WriteAllText(Path.Combine(tempDir, "video1.ko.srt"), "1\n00:00:01,000 --> 00:00:04,000\n안녕하세요");
            File.WriteAllText(Path.Combine(tempDir, "video1.en.vtt"), "WEBVTT\n\n00:00:01.000 --> 00:00:04.000\nHello");
            File.WriteAllText(Path.Combine(tempDir, "other.srt"), "1\n00:00:01,000 --> 00:00:04,000\nOther");

            var tracks = SubtitleSyncEngine.FindAssociatedSubtitles(videoPath);

            Assert.Equal(2, tracks.Count);
            Assert.Contains(tracks, t => t.LanguageCode == "ko" && t.Format == "srt");
            Assert.Contains(tracks, t => t.LanguageCode == "en" && t.Format == "vtt");
            Assert.DoesNotContain(tracks, t => t.FileName.Contains("other"));
        }
        finally
        {
            try { Directory.Delete(tempDir, true); } catch { }
        }
    }

    [Fact]
    public void Gate262_SubtitleSyncEngine_ParsesVttAndSrtCues()
    {
        var srtContent = @"1
00:01:10,500 --> 00:01:14,200
안녕하세요 반갑습니다

2
00:01:15,000 --> 00:01:18,500
다음 대사입니다";

        var cues = SubtitleSyncEngine.ParseCues(srtContent, "srt");

        Assert.Equal(2, cues.Count);
        Assert.Equal(70.5, cues[0].StartSec);
        Assert.Equal(74.2, cues[0].EndSec);
        Assert.Equal("안녕하세요 반갑습니다", cues[0].Text);
    }

    [Fact]
    public void Gate263_SubtitleSyncEngine_FindsActiveCue_AtCurrentPosition()
    {
        var cues = new List<SubtitleCue>
        {
            new(10.0, 15.0, "Active Subtitle Text")
        };

        var active12 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 12.5);
        Assert.NotNull(active12);
        Assert.Equal("Active Subtitle Text", active12!.Text);

        var active20 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 20.0);
        Assert.Null(active20);
    }

    [Fact]
    public void Gate264_SubtitleSyncEngine_AppliesTimeOffsetAdjustment()
    {
        var cues = new List<SubtitleCue>
        {
            new(10.0, 15.0, "Adjusted Subtitle")
        };

        // Offset +2.0s means original 10.0s now displays at 12.0s to 17.0s
        var active11 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 11.0, offsetSec: 2.0);
        Assert.Null(active11); // Not active yet at 11s

        var active13 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 13.0, offsetSec: 2.0);
        Assert.NotNull(active13);
        Assert.Equal("Adjusted Subtitle", active13!.Text);
    }
}