using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using System.Threading.Tasks;
using StellaOps.Policy;
using StellaOps.Scanner.WebService.Contracts;

namespace StellaOps.Scanner.WebService.Tests;

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

    [Fact]
    public async Task PolicySchemaReturnsEmbeddedSchema()
    {
        using var factory = new ScannerApplicationFactory();
        using var client = factory.CreateClient();

        var response = await client.GetAsync("/api/v1/policy/schema");
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        Assert.Equal("application/schema+json", response.Content.Headers.ContentType?.MediaType);

        var payload = await response.Content.ReadAsStringAsync();
        Assert.Contains("\"$schema\"", payload);
        Assert.Contains("\"properties\"", payload);
    }

    [Fact]
    public async Task PolicyDiagnosticsReturnsRecommendations()
    {
        using var factory = new ScannerApplicationFactory();
        using var client = factory.CreateClient();

        var request = new PolicyDiagnosticsRequestDto
        {
            Policy = new PolicyPreviewPolicyDto
            {
                Content = "version: \"1.0\"\nrules: []\n",
                Format = "yaml",
                Actor = "tester",
                Description = "empty ruleset"
            }
        };

        var response = await client.PostAsJsonAsync("/api/v1/policy/diagnostics", request);
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var diagnostics = await response.Content.ReadFromJsonAsync<PolicyDiagnosticsResponseDto>(SerializerOptions);
        Assert.NotNull(diagnostics);
        Assert.False(diagnostics!.Success);
        Assert.True(diagnostics.ErrorCount >= 0);
        Assert.NotEmpty(diagnostics.Recommendations);
    }

    [Fact]
    public async Task PolicyPreviewUsesProposedPolicy()
    {
        using var factory = new ScannerApplicationFactory();
        using var client = factory.CreateClient();

        const string policyYaml = """
version: "1.0"
rules:
  - name: Block Critical
    severity: [Critical]
    action: block
""";

        var request = new PolicyPreviewRequestDto
        {
            ImageDigest = "sha256:abc123",
            Findings = new[]
            {
                new PolicyPreviewFindingDto
                {
                    Id = "finding-1",
                    Severity = "Critical",
                    Source = "NVD",
                    Tags = new[] { "reachability:runtime" }
                }
            },
            Policy = new PolicyPreviewPolicyDto
            {
                Content = policyYaml,
                Format = "yaml",
                Actor = "preview",
                Description = "test policy"
            }
        };

        var response = await client.PostAsJsonAsync("/api/v1/policy/preview", request);
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var preview = await response.Content.ReadFromJsonAsync<PolicyPreviewResponseDto>(SerializerOptions);
        Assert.NotNull(preview);
        Assert.True(preview!.Success);
        Assert.Equal(1, preview.Changed);
        var diff = Assert.Single(preview.Diffs);
        Assert.Equal("finding-1", diff.Projected?.FindingId);
        Assert.Equal("Blocked", diff.Projected?.Status);
        Assert.Equal(PolicyScoringConfig.Default.Version, diff.Projected?.ConfigVersion);
        Assert.NotNull(diff.Projected?.Inputs);
        Assert.True(diff.Projected!.Inputs!.ContainsKey("severityWeight"));
        Assert.Equal("NVD", diff.Projected.SourceTrust);
        Assert.Equal("runtime", diff.Projected.Reachability);
    }
}