using System.Net;
using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using StellaOps.Scheduler.Models;
using StellaOps.Scheduler.WebService.GraphJobs;
using StellaOps.Scheduler.WebService.Options;

namespace StellaOps.Scheduler.WebService.Tests;

public sealed class CartographerWebhookClientTests
{
    [Fact]
    public async Task NotifyAsync_PostsPayload_WhenEnabled()
    {
        var handler = new RecordingHandler();
        var httpClient = new HttpClient(handler);
        var options = Microsoft.Extensions.Options.Options.Create(new SchedulerCartographerOptions
        {
            Webhook =
            {
                Enabled = true,
                Endpoint = "https://cartographer.local/hooks/graph-completed",
                ApiKeyHeader = "X-Api-Key",
                ApiKey = "secret"
            }
        });
        using var loggerFactory = LoggerFactory.Create(builder => builder.AddDebug());
        var client = new CartographerWebhookClient(httpClient, new OptionsMonitorStub<SchedulerCartographerOptions>(options), loggerFactory.CreateLogger<CartographerWebhookClient>());

        var job = new GraphBuildJob(
            id: "gbj_test",
            tenantId: "tenant-alpha",
            sbomId: "sbom",
            sbomVersionId: "sbom_v1",
            sbomDigest: "sha256:" + new string('a', 64),
            status: GraphJobStatus.Completed,
            trigger: GraphBuildJobTrigger.Backfill,
            createdAt: DateTimeOffset.UtcNow,
            graphSnapshotId: "snap",
            attempts: 1,
            cartographerJobId: "carto-123",
            correlationId: "corr-1",
            startedAt: null,
            completedAt: DateTimeOffset.UtcNow,
            error: null,
            metadata: Array.Empty<KeyValuePair<string, string>>());

        var notification = new GraphJobCompletionNotification(
            job.TenantId,
            GraphJobQueryType.Build,
            GraphJobStatus.Completed,
            DateTimeOffset.UtcNow,
            GraphJobResponse.From(job),
            "oras://snap/result",
            "corr-1",
            null);

        await client.NotifyAsync(notification, CancellationToken.None);

        Assert.NotNull(handler.LastRequest);
        Assert.Equal("https://cartographer.local/hooks/graph-completed", handler.LastRequest.RequestUri!.ToString());
        Assert.True(handler.LastRequest.Headers.TryGetValues("X-Api-Key", out var values) && values!.Single() == "secret");
        var json = JsonSerializer.Deserialize<JsonElement>(handler.LastPayload!);
        Assert.Equal("gbj_test", json.GetProperty("jobId").GetString());
        Assert.Equal("tenant-alpha", json.GetProperty("tenantId").GetString());
    }

    [Fact]
    public async Task NotifyAsync_Skips_WhenDisabled()
    {
        var handler = new RecordingHandler();
        var httpClient = new HttpClient(handler);
        var options = Microsoft.Extensions.Options.Options.Create(new SchedulerCartographerOptions());
        using var loggerFactory = LoggerFactory.Create(builder => builder.AddDebug());
        var client = new CartographerWebhookClient(httpClient, new OptionsMonitorStub<SchedulerCartographerOptions>(options), loggerFactory.CreateLogger<CartographerWebhookClient>());

        var job = new GraphOverlayJob(
            id: "goj-test",
            tenantId: "tenant-alpha",
            graphSnapshotId: "snap",
            overlayKind: GraphOverlayKind.Policy,
            overlayKey: "policy@1",
            status: GraphJobStatus.Completed,
            trigger: GraphOverlayJobTrigger.Manual,
            createdAt: DateTimeOffset.UtcNow,
            subjects: Array.Empty<string>(),
            attempts: 1,
            correlationId: null,
            startedAt: null,
            completedAt: DateTimeOffset.UtcNow,
            error: null,
            metadata: Array.Empty<KeyValuePair<string, string>>());

        var notification = new GraphJobCompletionNotification(
            job.TenantId,
            GraphJobQueryType.Overlay,
            GraphJobStatus.Completed,
            DateTimeOffset.UtcNow,
            GraphJobResponse.From(job),
            null,
            null,
            null);

        await client.NotifyAsync(notification, CancellationToken.None);

        Assert.Null(handler.LastRequest);
    }

    private sealed class RecordingHandler : HttpMessageHandler
    {
        public HttpRequestMessage? LastRequest { get; private set; }
        public string? LastPayload { get; private set; }

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            LastRequest = request;
            LastPayload = request.Content is null ? null : request.Content.ReadAsStringAsync(cancellationToken).Result;
            return Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK));
        }
    }

    private sealed class OptionsMonitorStub<T> : IOptionsMonitor<T> where T : class
    {
        private readonly IOptions<T> _options;

        public OptionsMonitorStub(IOptions<T> options)
        {
            _options = options;
        }

        public T CurrentValue => _options.Value;

        public T Get(string? name) => _options.Value;

        public IDisposable? OnChange(Action<T, string?> listener) => null;
    }
}