// -----------------------------------------------------------------------------
// DriftCommandTests.cs
// Sprint: SPRINT_20260105_002_004_CLI (CLI-010)
// Description: Unit tests for facet drift analysis CLI command.
// -----------------------------------------------------------------------------

using System.CommandLine;
using Moq;
using Xunit;
using StellaOps.Cli.Commands;

namespace StellaOps.Cli.Tests.Commands;

/// <summary>
/// Unit tests for the drift command structure.
/// </summary>
[Trait("Category", "Unit")]
public sealed class DriftCommandTests
{
    [Fact]
    public void DriftCommand_HasCorrectName()
    {
        // Arrange & Act
        var command = BuildDriftCommand();

        // Assert
        Assert.Equal("drift", command.Name);
    }

    [Fact]
    public void DriftCommand_HasCorrectDescription()
    {
        // Arrange & Act
        var command = BuildDriftCommand();

        // Assert
        Assert.Contains("drift", command.Description);
        Assert.Contains("baseline", command.Description);
    }

    [Fact]
    public void DriftCommand_HasImageArgument()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var imageArg = command.Arguments.FirstOrDefault(a => a.Name == "image");

        // Assert
        Assert.NotNull(imageArg);
        // Arguments are required by default in System.CommandLine
    }

    [Fact]
    public void DriftCommand_HasBaselineOption()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var baselineOpt = command.Options.FirstOrDefault(o =>
            o.Name == "baseline" || o.Name == "--baseline" || o.Aliases.Contains("--baseline"));

        // Assert
        Assert.NotNull(baselineOpt);
        Assert.True(baselineOpt.Aliases.Contains("-b") || baselineOpt.Aliases.Contains("--baseline"));
        Assert.Contains("Baseline seal", baselineOpt.Description);
    }

    [Fact]
    public void DriftCommand_HasFormatOption()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var formatOpt = command.Options.FirstOrDefault(o =>
            o.Name == "format" || o.Name == "--format" || o.Aliases.Contains("--format"));

        // Assert
        Assert.NotNull(formatOpt);
        Assert.Contains("table", formatOpt.Description);
        Assert.Contains("json", formatOpt.Description);
        Assert.Contains("yaml", formatOpt.Description);
    }

    [Fact]
    public void DriftCommand_HasVerboseFilesOption()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var verboseFilesOpt = command.Options.FirstOrDefault(o =>
            o.Name == "verbose-files" || o.Name == "--verbose-files" || o.Aliases.Contains("--verbose-files"));

        // Assert
        Assert.NotNull(verboseFilesOpt);
        Assert.Contains("file changes", verboseFilesOpt.Description);
    }

    [Fact]
    public void DriftCommand_HasFailOnBreachOption()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var failOnBreachOpt = command.Options.FirstOrDefault(o =>
            o.Name == "fail-on-breach" || o.Name == "--fail-on-breach" || o.Aliases.Contains("--fail-on-breach"));

        // Assert
        Assert.NotNull(failOnBreachOpt);
        Assert.Contains("error code", failOnBreachOpt.Description);
    }

    [Fact]
    public void DriftCommand_HasOutputOption()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var outputOpt = command.Options.FirstOrDefault(o =>
            o.Name == "output" || o.Name == "--output" || o.Aliases.Contains("--output"));

        // Assert
        Assert.NotNull(outputOpt);
        Assert.True(outputOpt.Aliases.Contains("-o") || outputOpt.Aliases.Contains("--output"));
    }

    [Fact]
    public void DriftCommand_HasVerboseOption()
    {
        // Arrange
        var command = BuildDriftCommand();

        // Act
        var verboseOpt = command.Options.FirstOrDefault(o =>
            o.Name == "verbose" || o.Name == "--verbose" || o.Aliases.Contains("--verbose"));

        // Assert
        Assert.NotNull(verboseOpt);
    }

    [Fact]
    public void DriftCommand_AllOptionsAreConfigured()
    {
        // Arrange
        var command = BuildDriftCommand();
        var expectedOptions = new[]
        {
            "baseline", "format", "verbose-files", "fail-on-breach", "output", "verbose"
        };

        // Act - normalize all option names by stripping leading dashes
        var actualOptionNames = command.Options
            .SelectMany(o => new[] { o.Name.TrimStart('-') }.Concat(o.Aliases.Select(a => a.TrimStart('-'))))
            .ToHashSet(StringComparer.OrdinalIgnoreCase);
        var actualArgs = command.Arguments.Select(a => a.Name).ToHashSet();

        // Assert - image is now an argument, not an option
        Assert.Contains("image", actualArgs);
        foreach (var expected in expectedOptions)
        {
            Assert.Contains(expected, actualOptionNames);
        }
    }

    [Fact]
    public void DriftCommand_ImageArgument_HasCorrectDescription()
    {
        // Arrange
        var command = BuildDriftCommand();
        var imageArg = command.Arguments.First(a => a.Name == "image");

        // Assert
        Assert.Contains("Image", imageArg.Description);
    }

    [Fact]
    public void DriftCommand_BaselineOption_HasCorrectAliases()
    {
        // Arrange
        var command = BuildDriftCommand();
        var baselineOpt = command.Options.First(o =>
            o.Name == "baseline" || o.Name == "--baseline" || o.Aliases.Contains("--baseline"));

        // Assert
        Assert.True(baselineOpt.Aliases.Contains("--baseline") || baselineOpt.Aliases.Contains("-b"));
    }

    [Fact]
    public void DriftCommand_OutputOption_HasCorrectAliases()
    {
        // Arrange
        var command = BuildDriftCommand();
        var outputOpt = command.Options.First(o =>
            o.Name == "output" || o.Name == "--output" || o.Aliases.Contains("--output"));

        // Assert
        Assert.True(outputOpt.Aliases.Contains("--output") || outputOpt.Aliases.Contains("-o"));
    }

    [Fact]
    public void DriftCommand_FormatOption_SupportsAllFormats()
    {
        // Arrange
        var command = BuildDriftCommand();
        var formatOpt = command.Options.First(o =>
            o.Name == "format" || o.Name == "--format" || o.Aliases.Contains("--format"));

        // Assert - verify description mentions all supported formats
        Assert.Contains("table", formatOpt.Description);
        Assert.Contains("json", formatOpt.Description);
        Assert.Contains("yaml", formatOpt.Description);
    }

    [Fact]
    public void DriftCommand_FailOnBreachOption_ExplainsBehavior()
    {
        // Arrange
        var command = BuildDriftCommand();
        var failOnBreachOpt = command.Options.First(o =>
            o.Name == "fail-on-breach" || o.Name == "--fail-on-breach" || o.Aliases.Contains("--fail-on-breach"));

        // Assert
        Assert.Contains("quota", failOnBreachOpt.Description);
    }

    private static Command BuildDriftCommand()
    {
        var mockServices = new Mock<IServiceProvider>();
        var verboseOption = new Option<bool>("--verbose");
        return DriftCommandGroup.BuildDriftCommand(
            mockServices.Object,
            verboseOption,
            CancellationToken.None);
    }
}