using VFXReviewWorker;
using Xunit;

namespace VFXReviewWorker.Tests;

/// <summary>
/// Recorded-transcript tests (§17.2): lines below are representative aerender
/// stdout from AE 2024/2025/2026 successes, errors, and stalls.
/// </summary>
public class ProgressParserTests
{
    [Theory]
    [InlineData("PROGRESS:  0:00:02:03 (51): 0 Seconds", 51)]
    [InlineData("PROGRESS: 2 (2): 1 Seconds", 2)]
    [InlineData("PROGRESS:  0:00:00:00 (1): 12 Seconds", 1)]
    [InlineData("PROGRESS:  0:00:04:23 (120): 3 Seconds", 120)]
    public void ParsesProgressFrames(string line, int expected)
    {
        Assert.Equal(expected, ProgressParser.ParseFrame(line));
    }

    [Theory]
    [InlineData("PROGRESS: Rendering frame data")]
    [InlineData("Starting composition \"UNG_106_010_020_cmp\".")]
    [InlineData("aerender version 24.3x52")]
    [InlineData("")]
    public void IgnoresNonFrameLines(string line)
    {
        Assert.Null(ProgressParser.ParseFrame(line));
    }

    [Theory]
    [InlineData("aerender ERROR: An existing connection was forcibly closed")]
    [InlineData("aerender ERROR -1610153464: After Effects error")]
    [InlineData("ERROR: Unable to open project")]
    [InlineData("aerender SYNTAX ERROR: Illegal argument flag: false")]
    public void DetectsErrorLines(string line)
    {
        Assert.True(ProgressParser.IsErrorLine(line));
    }

    [Fact]
    public void ProgressLineIsNotAnError()
    {
        Assert.False(ProgressParser.IsErrorLine("PROGRESS:  0:00:02:03 (51): 0 Seconds"));
    }

    [Theory]
    [InlineData("aerender ERROR: After Effects error: layer source file is missing or inaccessible")]
    [InlineData("aerender ERROR: No comp was found with the given name.")]
    [InlineData("aerender ERROR: project file could not be opened")]
    [InlineData("WARNING: Missing footage in comp")]
    [InlineData("aerender SYNTAX ERROR: Illegal argument flag: false")]
    public void DeterministicErrorsAreNonRetryable(string line)
    {
        Assert.True(ProgressParser.IsNonRetryableError(line));
    }

    [Theory]
    [InlineData("aerender ERROR: An existing connection was forcibly closed")]
    [InlineData("aerender ERROR -1610153464: After Effects crashed")]
    public void TransientErrorsStayRetryable(string line)
    {
        Assert.False(ProgressParser.IsNonRetryableError(line));
    }
}

public class EtaCalculatorTests
{
    [Fact]
    public void NoFramesMeansNoEstimate()
    {
        var eta = new EtaCalculator();
        Assert.Null(eta.EstimateSeconds(100));
    }

    [Fact]
    public void EstimatesFromRollingAverage()
    {
        var eta = new EtaCalculator();
        var t = DateTimeOffset.UtcNow;
        eta.RecordFrame(t);
        eta.RecordFrame(t.AddSeconds(2));
        eta.RecordFrame(t.AddSeconds(4)); // 2 s/frame average
        Assert.Equal(20, eta.EstimateSeconds(10));
    }

    [Fact]
    public void ZeroRemainingMeansNoEstimate()
    {
        var eta = new EtaCalculator();
        var t = DateTimeOffset.UtcNow;
        eta.RecordFrame(t);
        eta.RecordFrame(t.AddSeconds(1));
        Assert.Null(eta.EstimateSeconds(0));
    }

    [Fact]
    public void RollingWindowDropsOldFrames()
    {
        var eta = new EtaCalculator(windowSize: 2);
        var t = DateTimeOffset.UtcNow;
        eta.RecordFrame(t);
        eta.RecordFrame(t.AddSeconds(100)); // old slow frame, will roll out
        eta.RecordFrame(t.AddSeconds(101));
        eta.RecordFrame(t.AddSeconds(102)); // window now [1, 1]
        Assert.Equal(10, eta.EstimateSeconds(10));
    }
}

public class LogTailTests
{
    [Fact]
    public void KeepsOnlyLastNLines()
    {
        var tail = new LogTail(3);
        for (var i = 1; i <= 5; i++) tail.Add($"line {i}");
        Assert.Equal("line 3\nline 4\nline 5", tail.ToString());
    }
}