using ScadaLink.CLI.Commands;

namespace ScadaLink.CLI.Tests.Commands;

/// <summary>
/// Tests for the <c>scadalink audit verify-chain</c> subcommand (Audit Log #23 M8-T4).
/// v1 is a no-op stub: a valid <c>--month</c> prints the documented "not enabled"
/// message and exits 0; a malformed month or a missing <c>--month</c> exits non-zero.
/// </summary>
[Collection("Console")]
public class AuditVerifyChainCommandTests
{
    [Fact]
    public void VerifyChain_ValidMonth_ExitsZeroWithDocumentedMessage()
    {
        var root = AuditCommandTestHarness.BuildRoot();
        var (exit, output, _) = AuditCommandTestHarness.Invoke(
            root, "audit", "verify-chain", "--month", "2026-05");

        Assert.Equal(0, exit);
        Assert.Contains("Hash-chain tamper-evidence is not enabled", output);
        Assert.Contains("Component-AuditLog.md", output);
    }

    [Fact]
    public void VerifyChain_MalformedMonth_ExitsNonZero()
    {
        var root = AuditCommandTestHarness.BuildRoot();
        var (exit, _, _) = AuditCommandTestHarness.Invoke(
            root, "audit", "verify-chain", "--month", "2026-13");

        Assert.NotEqual(0, exit);
    }

    [Fact]
    public void VerifyChain_MissingMonth_ProducesRequiredFlagError()
    {
        var root = AuditCommandTestHarness.BuildRoot();
        var (exit, _, err) = AuditCommandTestHarness.Invoke(root, "audit", "verify-chain");

        Assert.NotEqual(0, exit);
        Assert.Contains("--month", err);
    }

    [Theory]
    [InlineData("2026-05", true)]
    [InlineData("2026-01", true)]
    [InlineData("2026-12", true)]
    [InlineData("2026-13", false)]
    [InlineData("2026-00", false)]
    [InlineData("2026-5", false)]
    [InlineData("not-a-month", false)]
    [InlineData("", false)]
    public void IsValidMonth_ValidatesYyyyMm(string month, bool expected)
    {
        Assert.Equal(expected, AuditVerifyChainHelpers.IsValidMonth(month));
    }
}