// -----------------------------------------------------------------------------
// EvidenceCompositionServiceTests.cs
// Sprint: SPRINT_3800_0003_0001_evidence_api_endpoint
// Description: Integration tests for Evidence API endpoints.
// -----------------------------------------------------------------------------

using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using StellaOps.Scanner.WebService.Contracts;
using StellaOps.Scanner.WebService.Endpoints;
using Xunit;
using FluentAssertions;


using StellaOps.TestKit;
namespace StellaOps.Scanner.WebService.Tests;

public sealed class EvidenceEndpointsTests
{
    private static readonly JsonSerializerOptions SerializerOptions = new(JsonSerializerDefaults.Web);

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task GetEvidence_ReturnsBadRequest_WhenScanIdInvalid()
    {
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = new ScannerApplicationFactory().WithOverrides(configuration =>
        {
            configuration["scanner:authority:enabled"] = "false";
        });
        using var client = factory.CreateClient();

        // Empty scan ID - route doesn't match
        var response = await client.GetAsync("/api/v1/scans//evidence/CVE-2024-12345@pkg:npm/lodash@4.17.0");

        response.StatusCode.Should().Be(HttpStatusCode.NotFound); // Route doesn't match
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task GetEvidence_ReturnsNotFound_WhenScanDoesNotExist()
    {
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = new ScannerApplicationFactory().WithOverrides(configuration =>
        {
            configuration["scanner:authority:enabled"] = "false";
        });
        using var client = factory.CreateClient();

        var response = await client.GetAsync(
            "/api/v1/scans/nonexistent-scan-id/evidence/CVE-2024-12345@pkg:npm/lodash@4.17.0");

        response.StatusCode.Should().Be(HttpStatusCode.NotFound);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task GetEvidence_ReturnsListEndpoint_WhenFindingIdEmpty()
    {
        // When no finding ID is provided, the route matches the list endpoint
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = new ScannerApplicationFactory().WithOverrides(configuration =>
        {
            configuration["scanner:authority:enabled"] = "false";
        });
        using var client = factory.CreateClient();

        // Create a scan first
        var scanId = await CreateScanAsync(client);

        // Empty finding ID - route matches list endpoint
        var response = await client.GetAsync($"/api/v1/scans/{scanId}/evidence");

        // Should return 200 OK with empty list (falls through to list endpoint)
        response.StatusCode.Should().Be(HttpStatusCode.OK);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task ListEvidence_ReturnsEmptyList_WhenNoFindings()
    {
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = new ScannerApplicationFactory().WithOverrides(configuration =>
        {
            configuration["scanner:authority:enabled"] = "false";
        });
        using var client = factory.CreateClient();

        var scanId = await CreateScanAsync(client);

        var response = await client.GetAsync($"/api/v1/scans/{scanId}/evidence");

        response.StatusCode.Should().Be(HttpStatusCode.OK);

        var result = await response.Content.ReadFromJsonAsync<EvidenceListResponse>(SerializerOptions);
        result.Should().NotBeNull();
        result!.TotalCount.Should().Be(0);
        result.Items.Should().BeEmpty();
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task ListEvidence_ReturnsEmptyList_WhenScanDoesNotExist()
    {
        // The current implementation returns empty list for non-existent scans
        // because the reachability service returns empty findings for unknown scans
        using var secrets = new TestSurfaceSecretsScope();
        using var factory = new ScannerApplicationFactory().WithOverrides(configuration =>
        {
            configuration["scanner:authority:enabled"] = "false";
        });
        using var client = factory.CreateClient();

using StellaOps.TestKit;
        var response = await client.GetAsync("/api/v1/scans/nonexistent-scan/evidence");

        // Current behavior: returns empty list (200 OK) for non-existent scans
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var result = await response.Content.ReadFromJsonAsync<EvidenceListResponse>(SerializerOptions);
        result.Should().NotBeNull();
        result!.TotalCount.Should().Be(0);
    }

    private static async Task<string> CreateScanAsync(HttpClient client)
    {
        var createRequest = new ScanSubmitRequest
        {
            Image = new ScanImageDescriptor { Reference = "example.com/test:latest" }
        };

        var createResponse = await client.PostAsJsonAsync("/api/v1/scans", createRequest);
        createResponse.EnsureSuccessStatusCode();

        var createResult = await createResponse.Content.ReadFromJsonAsync<JsonElement>();
        return createResult.GetProperty("scanId").GetString()!;
    }
}

/// <summary>
/// Tests for Evidence TTL and staleness handling (SPRINT_3800_0003_0002).
/// </summary>
public sealed class EvidenceTtlTests
{
    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void DefaultEvidenceTtlDays_DefaultsToSevenDays()
    {
        // Verify the default configuration
        var options = new StellaOps.Scanner.WebService.Services.EvidenceCompositionOptions();

        options.DefaultEvidenceTtlDays.Should().Be(7);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void VexEvidenceTtlDays_DefaultsToThirtyDays()
    {
        var options = new StellaOps.Scanner.WebService.Services.EvidenceCompositionOptions();

        options.VexEvidenceTtlDays.Should().Be(30);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void StaleWarningThresholdDays_DefaultsToOne()
    {
        var options = new StellaOps.Scanner.WebService.Services.EvidenceCompositionOptions();

        options.StaleWarningThresholdDays.Should().Be(1);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void EvidenceCompositionOptions_CanBeConfigured()
    {
        var options = new StellaOps.Scanner.WebService.Services.EvidenceCompositionOptions
        {
            DefaultEvidenceTtlDays = 14,
            VexEvidenceTtlDays = 60,
            StaleWarningThresholdDays = 2
        };

        options.DefaultEvidenceTtlDays.Should().Be(14);
        options.VexEvidenceTtlDays.Should().Be(60);
        options.StaleWarningThresholdDays.Should().Be(2);
    }
}