// Copyright (c) The Geekeey Authors
// SPDX-License-Identifier: EUPL-1.2

using Microsoft.Extensions.DependencyInjection;

namespace Geekeey.Request.Dispatcher.Tests;

internal sealed class StackTraceTests
{
	[Test]
	public async Task I_can_not_see_pipeline_internals_are_hidden_from_stack_trace_scalar()
	{
		// Arrange
		var sc = new ServiceCollection();
		sc.AddSingleton<ScalarTestTracker>();
		sc.AddRequestDispatcher(builder => builder
			.Add(typeof(FailingScalarHandler))
			.Add(typeof(ScalarOpenBehavior<,>)));

		var provider = sc.BuildServiceProvider();
		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
		var request = new FailingScalarRequest();

		// Act
		var exception = await Assert.ThrowsAsync<InvalidOperationException>(() =>
			dispatcher.DispatchAsync(request));

		// Assert
		await Assert.That(exception).IsNotNull();

		var stackTrace = await Assert.That(exception.StackTrace).IsNotNull();

		await Assert.That(stackTrace).Contains(nameof(FailingScalarHandler));
		await Assert.That(stackTrace).Contains(nameof(ScalarOpenBehavior<,>));

		// 3. Verify that the internal lambda from ScalarRequestInvoker.Chain is HIDDEN.
		// In C#, these lambdas usually appear as "ScalarRequestInvoker`2.<>c__DisplayClass..." or similar.
		// Since we added [StackTraceHidden], this frame should be omitted.
		await Assert.That(stackTrace).DoesNotContain("ScalarRequestInvoker+<>");
	}

	[Test]
	public async Task I_can_not_see_pipeline_internals_are_hidden_from_stack_trace_stream()
	{
		// Arrange
		var sc = new ServiceCollection();
		sc.AddSingleton<StreamTestTracker>();
		sc.AddRequestDispatcher(builder => builder
			.Add(typeof(FailingStreamHandler))
			.Add(typeof(StreamOpenBehavior<,>)));

		var provider = sc.BuildServiceProvider();
		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
		var request = new FailingStreamRequest();

		// Act
		var exception = await Assert.ThrowsAsync<InvalidOperationException>(() =>
				dispatcher.DispatchAsync(request).ToListAsync().AsTask());

		// Assert
		await Assert.That(exception).IsNotNull();

		var stackTrace = await Assert.That(exception.StackTrace).IsNotNull();

		await Assert.That(stackTrace).Contains(nameof(FailingStreamHandler));
		await Assert.That(stackTrace).Contains(nameof(StreamOpenBehavior<,>));

		// 3. Verify that the internal lambda from ScalarRequestInvoker.Chain is HIDDEN.
		// In C#, these lambdas usually appear as "ScalarRequestInvoker`2.<>c__DisplayClass..." or similar.
		// Since we added [StackTraceHidden], this frame should be omitted.
		await Assert.That(stackTrace).DoesNotContain("StreamRequestInvoker+<>");
	}
}