using System.Reflection;
using System.Security.Claims;
using Api.SeaHavenIndustries.Observability;
using FluentAssertions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Routing.Patterns;
using Moq;
using Sentry;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

public class SentryObservabilityTests
{
    private static readonly string ValidSha = new string('a', 40);
    private static readonly string UpperSha = "ABCDEF0123456789ABCDEF0123456789ABCDEF01";

    [Fact]
    public void ResolveRelease_Accepts_ServicePrefixed40HexCommit()
    {
        SentryObservability.ResolveRelease("shoc-backend@" + ValidSha)
            .Should().Be("shoc-backend@" + ValidSha);
    }

    [Theory]
    [InlineData(null)]
    [InlineData("1.0.0")]
    [InlineData("shoc-backend@abc")]
    [InlineData("shoc-backend@not-a-sha-at-all")]
    [InlineData("other-service@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")]
    [InlineData("SHOC-BACKEND@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")]
    [InlineData("")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa+bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa+dirty")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa+")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa++")]
    [InlineData("shoc-backend@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa+extra")]
    public void ResolveRelease_FallsBackToLocalDevelopment_ForNonReleaseVersion(string? version)
    {
        SentryObservability.ResolveRelease(version)
            .Should().Be(SentryObservability.LocalDevelopmentRelease);
        SentryObservability.ResolveCommitSha(version)
            .Should().BeNull();
    }

    [Fact]
    public void ResolveRelease_Accepts_SdkAppendedMatchingSourceRevisionSuffix()
    {
        var informationalVersion = "shoc-backend@" + ValidSha + "+" + ValidSha;

        SentryObservability.ResolveRelease(informationalVersion)
            .Should().Be("shoc-backend@" + ValidSha);
        SentryObservability.ResolveCommitSha(informationalVersion)
            .Should().Be(ValidSha);
    }

    [Fact]
    public void ResolveRelease_Accepts_SuffixDifferingOnlyInCase_FromTheCommitSha()
    {
        var canonicalSha = UpperSha.ToLowerInvariant();

        SentryObservability.ResolveRelease("shoc-backend@" + UpperSha + "+" + canonicalSha)
            .Should().Be("shoc-backend@" + canonicalSha);
    }

    [Fact]
    public void ResolveRelease_NormalizesUppercaseCommitShaToLowercase()
    {
        var canonicalSha = UpperSha.ToLowerInvariant();

        SentryObservability.ResolveRelease("shoc-backend@" + UpperSha)
            .Should().Be("shoc-backend@" + canonicalSha);
        SentryObservability.ResolveCommitSha("shoc-backend@" + UpperSha)
            .Should().Be(canonicalSha);
    }

    [Fact]
    public void ResolveCommitSha_ReturnsSha_WhenReleaseShaped()
    {
        var release = SentryObservability.ResolveRelease("shoc-backend@" + ValidSha);
        release[(SentryObservability.ServiceName.Length + 1)..].Should().Be(ValidSha);
        SentryObservability.ResolveCommitSha("shoc-backend@" + ValidSha)
            .Should().Be(ValidSha);
    }

    [Fact]
    public void ResolveRelease_AndCommitSha_FromNonReleaseAssembly_FallBackSafely()
    {
        var assembly = typeof(SentryObservabilityTests).Assembly;

        SentryObservability.ResolveRelease(assembly)
            .Should().Be(SentryObservability.LocalDevelopmentRelease);
        SentryObservability.ResolveCommitSha(assembly)
            .Should().BeNull();
    }

    [Fact]
    public void ResolveRelease_AndCommitSha_FromNullAssembly_FallBackSafely()
    {
        SentryObservability.ResolveRelease((Assembly?)null)
            .Should().Be(SentryObservability.LocalDevelopmentRelease);
        SentryObservability.ResolveCommitSha((Assembly?)null)
            .Should().BeNull();
    }

    [Fact]
    public void ConfigureRequest_SetsUser_FromNameIdentifierOnly_AndUsesRouteTemplateNotValues()
    {
        var (hub, scope) = CreateHub();
        var context = CreateHttpContext(
            routePattern: "/api/work-orders/{workOrderId}",
            claims: new[]
            {
                new Claim(ClaimTypes.NameIdentifier, "user-123"),
                new Claim(ClaimTypes.Email, "secret.user@example.com"),
                new Claim(ClaimTypes.Name, "Secret User"),
            });
        context.Request.QueryString = new QueryString("?ticket=secret-query-value");
        context.Request.Method = "GET";

        SentryObservability.ConfigureRequest(hub.Object, context);

        scope.User.Should().NotBeNull();
        scope.User!.Id.Should().Be("user-123");
        scope.User.Email.Should().BeNull();
        scope.User.Username.Should().BeNull();

        scope.Tags["actor.type"].Should().Be("authenticated");
        scope.Tags["operation.type"].Should().Be("http.server");
        scope.Tags["code.function"].Should().Be("WorkOrders.GetWorkOrder");
        scope.Tags["http.method"].Should().Be("GET");
        scope.Tags["http.route"].Should().Be("/api/work-orders/{workOrderId}");
        scope.Tags["trace_id"].Should().NotBeNullOrWhiteSpace();
        scope.Tags["transaction_id"].Should().NotBeNullOrWhiteSpace();

        scope.Tags.Values.Should().NotContain(value => value != null && value.Contains("secret", StringComparison.OrdinalIgnoreCase),
            "no query, header, body, cookie, name, or email material may reach Sentry tags");
    }

    [Fact]
    public void ConfigureRequest_AnonymousRequest_TagsAnonymous_AndSetsNoUser()
    {
        var (hub, scope) = CreateHub();
        var context = CreateHttpContext("/api/vendors", Array.Empty<Claim>());

        SentryObservability.ConfigureRequest(hub.Object, context);

        scope.User.Id.Should().BeNull();
        scope.Tags["actor.type"].Should().Be("anonymous");
        scope.Tags["code.function"].Should().Be("Vendors.List");
        scope.Tags["http.route"].Should().Be("/api/vendors");
    }

    [Fact]
    public void ConfigureRequest_NonControllerEndpoint_OmitsCodeFunction()
    {
        var (hub, scope) = CreateHub();
        var context = CreateHttpContext("/health", Array.Empty<Claim>(), includeActionDescriptor: false);

        SentryObservability.ConfigureRequest(hub.Object, context);

        scope.Tags.Should().NotContainKey("code.function");
    }

    [Fact]
    public void BeginBackgroundTransaction_SetsScopeTransaction_AndSystemTags()
    {
        var (hub, scope) = CreateHub();
        var transaction = new Mock<ITransactionTracer>();
        hub.Setup(h => h.StartTransaction(
                It.IsAny<ITransactionContext>(),
                It.IsAny<IReadOnlyDictionary<string, object?>>()))
            .Returns(transaction.Object);

        using var handle = SentryObservability.BeginBackgroundTransaction(
            hub.Object,
            "workorders.job",
            "MyWorker.Run",
            "the-reason");

        hub.Verify(h => h.StartTransaction(
            It.Is<ITransactionContext>(context => context.Name == "workorders.job" && context.Operation == "task"),
            It.IsAny<IReadOnlyDictionary<string, object?>>()), Times.Once);
        scope.Transaction.Should().BeSameAs(transaction.Object);
        transaction.VerifySet(t => t.Description = "the-reason", Times.Once);

        transaction.Verify(t => t.SetTag("actor.type", "system"), Times.Once);
        transaction.Verify(t => t.SetTag("operation.type", "background_job"), Times.Once);
        transaction.Verify(t => t.SetTag("code.function", "MyWorker.Run"), Times.Once);
        transaction.Verify(t => t.SetTag("trace_id", It.IsAny<string>()), Times.Once);
        transaction.Verify(t => t.SetTag("transaction_id", It.IsAny<string>()), Times.Once);
        scope.Tags["operation.type"].Should().Be("background_job");
    }

    [Fact]
    public void BeginBackgroundTransaction_Handle_CannotDoubleFinish()
    {
        var (hub, _) = CreateHub();
        var transaction = new Mock<ITransactionTracer>();
        hub.Setup(h => h.StartTransaction(
                It.IsAny<ITransactionContext>(),
                It.IsAny<IReadOnlyDictionary<string, object?>>()))
            .Returns(transaction.Object);

        using var handle = SentryObservability.BeginBackgroundTransaction(hub.Object, "job", "Fn");

        handle.FinishOk();
        handle.FinishOk();
        handle.FinishError(new InvalidOperationException("late"));
        handle.FinishCancelled();

        transaction.Verify(t => t.Finish(SpanStatus.Ok), Times.Once);
        transaction.Verify(t => t.Finish(It.IsAny<Exception>(), It.IsAny<SpanStatus>()), Times.Never);
        transaction.Verify(t => t.Finish(SpanStatus.Cancelled), Times.Never);
    }

    [Fact]
    public void Dispose_UnfinishedTransaction_FinishesOnceWithUnknownErrorStatus()
    {
        var (hub, _) = CreateHub();
        var transaction = new Mock<ITransactionTracer>();
        hub.Setup(h => h.StartTransaction(
                It.IsAny<ITransactionContext>(),
                It.IsAny<IReadOnlyDictionary<string, object?>>()))
            .Returns(transaction.Object);

        var handle = SentryObservability.BeginBackgroundTransaction(hub.Object, "job", "Fn");
        handle.Dispose();
        handle.Dispose();

        transaction.Verify(t => t.Finish(SpanStatus.UnknownError), Times.Once);
        transaction.Verify(t => t.Finish(It.IsAny<SpanStatus>()), Times.Once);
    }

    [Fact]
    public void Dispose_AfterFinish_DoesNotFinishAgain()
    {
        var (hub, _) = CreateHub();
        var transaction = new Mock<ITransactionTracer>();
        hub.Setup(h => h.StartTransaction(
                It.IsAny<ITransactionContext>(),
                It.IsAny<IReadOnlyDictionary<string, object?>>()))
            .Returns(transaction.Object);

        var handle = SentryObservability.BeginBackgroundTransaction(hub.Object, "job", "Fn");
        handle.FinishOk();
        handle.Dispose();

        transaction.Verify(t => t.Finish(SpanStatus.Ok), Times.Once);
        transaction.Verify(t => t.Finish(SpanStatus.UnknownError), Times.Never);
        transaction.Verify(t => t.Finish(It.IsAny<SpanStatus>()), Times.Once);
    }

    [Fact]
    public void TelemetryScrubber_RemovesRequestSecrets_AndKeepsOnlyOpaqueUserId()
    {
        var @event = new SentryEvent
        {
            User = new SentryUser
            {
                Id = "opaque-user-123",
                Email = "secret.user@example.com",
                Username = "Secret User",
                IpAddress = "203.0.113.10",
            },
            Request = new SentryRequest
            {
                Data = "secret-body",
                QueryString = "token=secret-query",
                Cookies = "session=secret-cookie",
            },
        };
        @event.Request.Headers["Authorization"] = "Bearer secret-token";
        @event.Request.Env["private"] = "secret-env";
        @event.Request.Other["private"] = "secret-other";

        var scrubbed = SentryTelemetryScrubber.Scrub(@event);

        scrubbed.Request!.Data.Should().BeNull();
        scrubbed.Request.QueryString.Should().BeNull();
        scrubbed.Request.Cookies.Should().BeNull();
        scrubbed.Request.Headers.Should().BeEmpty();
        scrubbed.Request.Env.Should().BeEmpty();
        scrubbed.Request.Other.Should().BeEmpty();
        scrubbed.User.Should().NotBeNull();
        scrubbed.User!.Id.Should().Be("opaque-user-123");
        scrubbed.User.Email.Should().BeNull();
        scrubbed.User.Username.Should().BeNull();
        scrubbed.User.IpAddress.Should().BeNull();
    }

    [Fact]
    public void TelemetryScrubber_RemovesSensitiveTransactionData()
    {
        var transaction = new SentryTransaction("GET /api/work-orders/{id}", "http.server");
        transaction.SetData("http.route", "/api/work-orders/{id}");
        transaction.SetData("http.query", "token=secret-query");
#pragma warning disable CS0618 // Exercise the scrubber's legacy Extra cleanup contract.
        transaction.SetExtra("secret", "secret-extra");
#pragma warning restore CS0618
        var scrubbed = SentryTelemetryScrubber.Scrub(transaction);

        scrubbed.Data.Should().ContainKey("http.route");
        scrubbed.Data.Should().NotContainKey("http.query");
#pragma warning disable CS0618 // Exercise the scrubber's legacy Extra cleanup contract.
        scrubbed.Extra.Should().NotContainKey("secret");
#pragma warning restore CS0618
        scrubbed.Tags["trace_id"].Should().Be(scrubbed.TraceId.ToString());
        scrubbed.Tags["transaction_id"].Should().Be(scrubbed.SpanId.ToString());
    }

    private static (Mock<IHub> Hub, Scope Scope) CreateHub()
    {
        var hub = new Mock<IHub>();
        var scope = new Scope(new SentryOptions());
        hub.Setup(h => h.ConfigureScope(It.IsAny<Action<Scope>>()))
            .Callback<Action<Scope>>(action => action(scope));
        hub.Setup(h => h.PushScope()).Returns(Mock.Of<IDisposable>());

        var activeSpan = new Mock<ISpan>();
        activeSpan.SetupGet(span => span.TraceId).Returns(SentryId.Create());
        activeSpan.SetupGet(span => span.SpanId).Returns(SpanId.Create());
        hub.Setup(h => h.GetSpan()).Returns(activeSpan.Object);
        return (hub, scope);
    }

    private static HttpContext CreateHttpContext(
        string routePattern,
        Claim[] claims,
        bool includeActionDescriptor = true)
    {
        var metadata = includeActionDescriptor
            ? new object[]
            {
                new ControllerActionDescriptor
                {
                    ControllerName = routePattern.StartsWith("/api/work-orders") ? "WorkOrders" : "Vendors",
                    ActionName = routePattern.StartsWith("/api/work-orders") ? "GetWorkOrder" : "List",
                },
            }
            : Array.Empty<object>();

        var endpoint = new RouteEndpoint(
            _ => Task.CompletedTask,
            RoutePatternFactory.Parse(routePattern),
            0,
            new EndpointMetadataCollection(metadata),
            "test-endpoint");

        var context = new DefaultHttpContext();
        context.SetEndpoint(endpoint);
        context.User = new ClaimsPrincipal(new ClaimsIdentity(claims, "TestAuth"));
        return context;
    }
}