using System.Text.RegularExpressions;
using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Host.Tests.Configuration;

/// <summary>
///     Pins the one <c>AddZbSecrets</c> call that no executable test can reach: the pre-host
///     <c>${secret:}</c> expander in <c>Program.cs</c> (top-level statements). That call composes the
///     secrets subsystem in a throwaway <c>ServiceCollection</c> with no <c>IHostEnvironment</c>, so
///     it MUST pass the content root explicitly (the Secrets 0.6.1 four-argument overload) — dropped
///     back to the three-argument form, the under-content-root store rule silently vanishes at
///     exactly the moment the migrator creates the store file, and a rejected path gains an empty
///     database before the real host aborts (the 0.6.0 defect; the runtime half of this pin is
///     <c>SecretsStorePathValidationTests.Without_the_explicit_content_root_the_prehost_hole_reopens</c>
///     in Host.IntegrationTests).
/// </summary>
public sealed class SecretsPreHostContentRootSourceTests
{
    [Fact]
    public void The_prehost_expander_passes_the_content_root_explicitly()
    {
        var source = ReadProgramSource();

        // The throwaway container's AddZbSecrets call, allowing for formatting drift but requiring
        // the third argument to be the builder's content root.
        Regex.IsMatch(
                source,
                @"new\s+ServiceCollection\(\)\s*\.\s*AddZbSecrets\(\s*builder\.Configuration\s*,\s*""Secrets""\s*,\s*builder\.Environment\.ContentRootPath\s*\)",
                RegexOptions.Singleline)
            .ShouldBeTrue(
                "Program.cs's pre-host secrets expander must call the four-argument AddZbSecrets "
                + "overload with builder.Environment.ContentRootPath — the throwaway container has no "
                + "IHostEnvironment, and without the explicit root the under-content-root store rule "
                + "is skipped while the migrator creates the store file");
    }

    private static string ReadProgramSource()
    {
        var dir = new DirectoryInfo(AppContext.BaseDirectory);
        while (dir is not null && !File.Exists(Path.Combine(dir.FullName, "ZB.MOM.WW.OtOpcUa.slnx")))
            dir = dir.Parent!;
        dir.ShouldNotBeNull();

        return File.ReadAllText(Path.Combine(
            dir.FullName, "src", "Server", "ZB.MOM.WW.OtOpcUa.Host", "Program.cs"));
    }
}