using ScadaLink.AuditLog.Configuration;

namespace ScadaLink.AuditLog.Tests.Configuration;

/// <summary>
/// Task 1 of <c>docs/plans/2026-05-23-inbound-api-full-response-audit.md</c>:
/// pins the <see cref="AuditLogOptions.InboundMaxBytes"/> default to 1 MiB and
/// the validator bounds to <c>[8 KiB, 16 MiB]</c>. The inbound channel needs a
/// much larger ceiling than the 8 KiB / 64 KiB default/error caps that other
/// channels use, but unbounded would let any caller flood the central
/// <c>AuditLog</c> table with arbitrarily large bodies — hence the upper bound.
/// Companion to <see cref="AuditLogOptionsTests"/> which covers the existing
/// cap-bytes + retention invariants.
/// </summary>
public class AuditLogOptionsValidatorTests
{
    [Fact]
    public void Validate_InboundMaxBytes_DefaultOptions_IsOneMebibyte()
    {
        // The doc'd default per docs/plans/2026-05-23-inbound-api-full-response-audit-design.md
        // is 1 048 576 bytes (1 MiB). Pin it so a config drift is a test failure,
        // not a silent operational surprise.
        var opts = new AuditLogOptions();
        Assert.Equal(1_048_576, opts.InboundMaxBytes);
    }

    [Theory]
    [InlineData(8_192)]              // documented min
    [InlineData(1_048_576)]          // default
    [InlineData(16_777_216)]         // documented max
    public void Validate_InboundMaxBytes_InRange_Passes(int value)
    {
        var validator = new AuditLogOptionsValidator();
        var opts = new AuditLogOptions { InboundMaxBytes = value };
        Assert.True(validator.Validate(null, opts).Succeeded);
    }

    [Theory]
    [InlineData(0)]
    [InlineData(8_191)]
    [InlineData(16_777_217)]
    [InlineData(int.MaxValue)]
    public void Validate_InboundMaxBytes_OutOfRange_Fails(int value)
    {
        var validator = new AuditLogOptionsValidator();
        var opts = new AuditLogOptions { InboundMaxBytes = value };
        var result = validator.Validate(null, opts);
        Assert.False(result.Succeeded);
        Assert.Contains(
            result.Failures!,
            f => f.Contains(nameof(AuditLogOptions.InboundMaxBytes), StringComparison.Ordinal));
    }
}