using System.Collections.Concurrent;
using System.Net;
using System.Net.Http.Json;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using StellaOps.Scanner.Storage.ObjectStore;
using StellaOps.Scanner.WebService.Contracts;
using Xunit;

namespace StellaOps.Scanner.WebService.Tests;

public sealed class SbomUploadEndpointsTests
{
    [Fact]
    public async Task Upload_accepts_cyclonedx_fixture_and_returns_record()
    {
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = CreateFactory();
        using var client = factory.CreateClient();

        var request = new SbomUploadRequestDto
        {
            ArtifactRef = "example.com/app:1.0",
            SbomBase64 = LoadFixtureBase64("sample.cdx.json"),
            Source = new SbomUploadSourceDto
            {
                Tool = "syft",
                Version = "1.0.0",
                CiContext = new SbomUploadCiContextDto
                {
                    BuildId = "build-123",
                    Repository = "github.com/example/app"
                }
            }
        };

        var response = await client.PostAsJsonAsync("/api/v1/sbom/upload", request);
        Assert.Equal(HttpStatusCode.Accepted, response.StatusCode);

        var payload = await response.Content.ReadFromJsonAsync<SbomUploadResponseDto>();
        Assert.NotNull(payload);
        Assert.Equal("example.com/app:1.0", payload!.ArtifactRef);
        Assert.Equal("cyclonedx", payload.Format);
        Assert.Equal("1.6", payload.FormatVersion);
        Assert.True(payload.ValidationResult.Valid);
        Assert.False(string.IsNullOrWhiteSpace(payload.AnalysisJobId));

        var recordResponse = await client.GetAsync($"/api/v1/sbom/uploads/{payload.SbomId}");
        Assert.Equal(HttpStatusCode.OK, recordResponse.StatusCode);

        var record = await recordResponse.Content.ReadFromJsonAsync<SbomUploadRecordDto>();
        Assert.NotNull(record);
        Assert.Equal(payload.SbomId, record!.SbomId);
        Assert.Equal("example.com/app:1.0", record.ArtifactRef);
        Assert.Equal("syft", record.Source?.Tool);
        Assert.Equal("build-123", record.Source?.CiContext?.BuildId);
    }

    [Fact]
    public async Task Upload_accepts_spdx_fixture_and_reports_quality_score()
    {
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = CreateFactory();
        using var client = factory.CreateClient();

        var request = new SbomUploadRequestDto
        {
            ArtifactRef = "example.com/service:2.0",
            SbomBase64 = LoadFixtureBase64("sample.spdx.json")
        };

        var response = await client.PostAsJsonAsync("/api/v1/sbom/upload", request);
        Assert.Equal(HttpStatusCode.Accepted, response.StatusCode);

        var payload = await response.Content.ReadFromJsonAsync<SbomUploadResponseDto>();
        Assert.NotNull(payload);
        Assert.Equal("spdx", payload!.Format);
        Assert.Equal("2.3", payload.FormatVersion);
        Assert.True(payload.ValidationResult.Valid);
        Assert.True(payload.ValidationResult.QualityScore > 0);
        Assert.True(payload.ValidationResult.ComponentCount > 0);
    }

    [Fact]
    public async Task Upload_rejects_unknown_format()
    {
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = CreateFactory();
        using var client = factory.CreateClient();

        var invalid = new SbomUploadRequestDto
        {
            ArtifactRef = "example.com/invalid:1.0",
            SbomBase64 = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes("{\"name\":\"oops\"}"))
        };

        var response = await client.PostAsJsonAsync("/api/v1/sbom/upload", invalid);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    private static ScannerApplicationFactory CreateFactory()
    {
        return new ScannerApplicationFactory().WithOverrides(configuration =>
        {
            configuration["scanner:authority:enabled"] = "false";
        }, configureServices: services =>
        {
            services.RemoveAll<IArtifactObjectStore>();
            services.AddSingleton<IArtifactObjectStore>(new InMemoryArtifactObjectStore());
        });
    }

    private static string LoadFixtureBase64(string fileName)
    {
        var baseDirectory = AppContext.BaseDirectory;
        var repoRoot = Path.GetFullPath(Path.Combine(baseDirectory, "..", "..", "..", "..", ".."));
        var path = Path.Combine(
            repoRoot,
            "tests",
            "AirGap",
            "StellaOps.AirGap.Importer.Tests",
            "Reconciliation",
            "Fixtures",
            fileName);

        Assert.True(File.Exists(path), $"Fixture not found at {path}.");
        var bytes = File.ReadAllBytes(path);
        return Convert.ToBase64String(bytes);
    }

    private sealed class InMemoryArtifactObjectStore : IArtifactObjectStore
    {
        private readonly ConcurrentDictionary<string, byte[]> _objects = new(StringComparer.Ordinal);

        public async Task PutAsync(ArtifactObjectDescriptor descriptor, Stream content, CancellationToken cancellationToken)
        {
            ArgumentNullException.ThrowIfNull(descriptor);
            ArgumentNullException.ThrowIfNull(content);

            using var buffer = new MemoryStream();
            await content.CopyToAsync(buffer, cancellationToken).ConfigureAwait(false);

            var key = $"{descriptor.Bucket}:{descriptor.Key}";
            _objects[key] = buffer.ToArray();
        }

        public Task<Stream?> GetAsync(ArtifactObjectDescriptor descriptor, CancellationToken cancellationToken)
        {
            ArgumentNullException.ThrowIfNull(descriptor);

            var key = $"{descriptor.Bucket}:{descriptor.Key}";
            if (!_objects.TryGetValue(key, out var bytes))
            {
                return Task.FromResult<Stream?>(null);
            }

            return Task.FromResult<Stream?>(new MemoryStream(bytes, writable: false));
        }

        public Task DeleteAsync(ArtifactObjectDescriptor descriptor, CancellationToken cancellationToken)
        {
            ArgumentNullException.ThrowIfNull(descriptor);
            var key = $"{descriptor.Bucket}:{descriptor.Key}";
            _objects.TryRemove(key, out _);
            return Task.CompletedTask;
        }
    }
}