using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using Azaion.E2E.Helpers;
using FluentAssertions;
using Xunit;

namespace Azaion.E2E.Tests;

[Collection("E2E")]
public sealed class ResourceUpdateTests
{
    private static readonly JsonSerializerOptions ResponseJsonOptions = new()
    {
        PropertyNameCaseInsensitive = true
    };

    private sealed record ResourceUpdateItemDto(
        string ResourceName,
        string Version,
        string CdnUrl,
        string Sha256,
        string EncryptionKey,
        long   SizeBytes);

    private readonly TestFixture _fixture;

    public ResourceUpdateTests(TestFixture fixture) => _fixture = fixture;

    private static object PublishBody(string resourceName, string version, string arch = "arm64",
        string stage = "stage", string encryptionKey = "test-resource-key-001") => new
    {
        resourceName,
        devStage      = stage,
        architecture  = arch,
        version,
        cdnUrl        = $"https://cdn.example.com/{resourceName}-{version}.bin",
        sha256        = "abc123def456789",
        encryptionKey,
        sizeBytes     = 1024L
    };

    private async Task<string> NewUploaderTokenAsync()
    {
        using var loginClient = _fixture.CreateApiClient();
        return await loginClient.LoginAsync(_fixture.UploaderEmail, _fixture.UploaderPassword);
    }

    [Fact]
    public async Task AC2_GetUpdate_returns_resources_newer_than_device_version()
    {
        // Arrange
        var uploaderToken = await NewUploaderTokenAsync();
        using var uploaderClient = _fixture.CreateAuthenticatedClient(uploaderToken);
        using var deviceClient   = _fixture.CreateAuthenticatedClient(_fixture.AdminToken);

        var arch  = "arm64";
        var stage = $"stage-{Guid.NewGuid():N}".Substring(0, 12);
        var resourceName = $"annotations-{Guid.NewGuid():N}".Substring(0, 20);

        using var publish = await uploaderClient.PostAsync("/resources/publish",
            PublishBody(resourceName, "2026-04-13", arch, stage, "device-key-AC2"));
        publish.StatusCode.Should().Be(HttpStatusCode.OK);

        // Act
        using var response = await deviceClient.PostAsync("/get-update", new
        {
            architecture    = arch,
            devStage        = stage,
            currentVersions = new Dictionary<string, string> { [resourceName] = "2026-02-25" }
        });

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var items = await response.Content.ReadFromJsonAsync<List<ResourceUpdateItemDto>>(ResponseJsonOptions);
        items.Should().NotBeNull();
        items!.Should().HaveCount(1);
        items![0].ResourceName.Should().Be(resourceName);
        items[0].Version.Should().Be("2026-04-13");
        items[0].CdnUrl.Should().Be($"https://cdn.example.com/{resourceName}-2026-04-13.bin");
        items[0].Sha256.Should().Be("abc123def456789");
        items[0].EncryptionKey.Should().Be("device-key-AC2",
            "the column is AES-encrypted at rest but the response must contain plaintext for the device");
        items[0].SizeBytes.Should().Be(1024L);
    }

    [Fact]
    public async Task AC3_GetUpdate_returns_empty_when_device_already_has_latest()
    {
        // Arrange
        var uploaderToken = await NewUploaderTokenAsync();
        using var uploaderClient = _fixture.CreateAuthenticatedClient(uploaderToken);
        using var deviceClient   = _fixture.CreateAuthenticatedClient(_fixture.AdminToken);

        var arch  = "arm64";
        var stage = $"stage-{Guid.NewGuid():N}".Substring(0, 12);
        var resourceName = $"weights-{Guid.NewGuid():N}".Substring(0, 20);

        using var publish = await uploaderClient.PostAsync("/resources/publish",
            PublishBody(resourceName, "2026-04-13", arch, stage));
        publish.StatusCode.Should().Be(HttpStatusCode.OK);

        // Act
        using var response = await deviceClient.PostAsync("/get-update", new
        {
            architecture    = arch,
            devStage        = stage,
            currentVersions = new Dictionary<string, string> { [resourceName] = "2026-04-13" }
        });

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        var items = await response.Content.ReadFromJsonAsync<List<ResourceUpdateItemDto>>(ResponseJsonOptions);
        items.Should().NotBeNull();
        items!.Should().BeEmpty();
    }

    [Fact]
    public async Task AC5_Cache_is_invalidated_on_publish()
    {
        // Arrange
        var uploaderToken = await NewUploaderTokenAsync();
        using var uploaderClient = _fixture.CreateAuthenticatedClient(uploaderToken);
        using var deviceClient   = _fixture.CreateAuthenticatedClient(_fixture.AdminToken);

        var arch  = "arm64";
        var stage = $"stage-{Guid.NewGuid():N}".Substring(0, 12);
        var resourceName = $"models-{Guid.NewGuid():N}".Substring(0, 20);

        using var publishV1 = await uploaderClient.PostAsync("/resources/publish",
            PublishBody(resourceName, "2026-02-25", arch, stage));
        publishV1.StatusCode.Should().Be(HttpStatusCode.OK);

        var deviceVersionsAtV1 = new { architecture = arch, devStage = stage,
            currentVersions = new Dictionary<string, string> { [resourceName] = "2026-02-25" } };

        using (var primeCache = await deviceClient.PostAsync("/get-update", deviceVersionsAtV1))
        {
            primeCache.StatusCode.Should().Be(HttpStatusCode.OK);
            var primed = await primeCache.Content.ReadFromJsonAsync<List<ResourceUpdateItemDto>>(ResponseJsonOptions);
            primed!.Should().BeEmpty();
        }

        // Act
        using var publishV2 = await uploaderClient.PostAsync("/resources/publish",
            PublishBody(resourceName, "2026-04-13", arch, stage));
        publishV2.StatusCode.Should().Be(HttpStatusCode.OK);

        using var afterPublish = await deviceClient.PostAsync("/get-update", deviceVersionsAtV1);

        // Assert
        afterPublish.StatusCode.Should().Be(HttpStatusCode.OK);
        var items = await afterPublish.Content.ReadFromJsonAsync<List<ResourceUpdateItemDto>>(ResponseJsonOptions);
        items.Should().NotBeNull();
        items!.Should().HaveCount(1, "publish must invalidate the per-(arch,stage) latest-versions cache");
        items![0].Version.Should().Be("2026-04-13");
    }

    [Fact]
    public async Task GetUpdate_without_jwt_returns_401()
    {
        // Arrange
        using var client = _fixture.CreateApiClient();

        // Act
        using var response = await client.PostAsync("/get-update", new
        {
            architecture    = "arm64",
            devStage        = "stage",
            currentVersions = new Dictionary<string, string>()
        });

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.Unauthorized);
    }
}