using System.Security.Cryptography;
using System.Text;
using Api.SeaHavenIndustries.Controllers;
using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Data.Sqlite;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using SeaHaven.DataServices.Implementation;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.Services.Configuration;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Interfaces;

namespace SeaHavenIndustries.Tests;

public sealed class WorkOrderWebhookServiceTests
{
    private static readonly byte[] Secret = Encoding.UTF8.GetBytes("test-secret-with-enough-entropy");
    private static readonly DateTimeOffset Now = new(2026, 7, 24, 12, 0, 0, TimeSpan.Zero);

    [Fact]
    public async Task Valid_signature_is_parsed_and_forwarded_with_cancellation()
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var body = ValidBody();
        var timestamp = Now.ToUnixTimeSeconds().ToString();
        using var cts = new CancellationTokenSource();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(timestamp, "current", Sign(timestamp, body), body),
            cts.Token);

        Assert.Equal(WorkOrderWebhookStatus.Applied, result.Status);
        Assert.NotNull(data.Mutation);
        Assert.Equal("delivery-1", data.Mutation.DeliveryId);
        Assert.Equal("WO-123", data.Mutation.WorkerOrderNumber);
        Assert.Equal(cts.Token, data.CancellationToken);
    }

    [Fact]
    public async Task Authentic_wire_source_is_accepted_and_persisted_as_canonical()
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var body = ValidBody();
        var timestamp = Now.ToUnixTimeSeconds().ToString();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(timestamp, "current", Sign(timestamp, body), body),
            CancellationToken.None);

        Assert.Equal(WorkOrderWebhookStatus.Applied, result.Status);
        Assert.NotNull(data.Mutation);
        Assert.Equal("procurement", data.Mutation!.Source);
    }

    [Fact]
    public async Task Legacy_procurement_wire_source_is_rejected_before_persistence()
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var body = ValidBody(source: "procurement");
        var timestamp = Now.ToUnixTimeSeconds().ToString();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(timestamp, "current", Sign(timestamp, body), body),
            CancellationToken.None);

        Assert.Equal(WorkOrderWebhookStatus.InvalidEnvelope, result.Status);
        Assert.Null(data.Mutation);
    }

    [Fact]
    public async Task Provider_external_id_is_preserved_without_internal_number_normalization()
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var externalId = "WO-PROCUREMENT-2026-000000000123";
        var body = ValidBody(workOrderId: externalId);
        var timestamp = Now.ToUnixTimeSeconds().ToString();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(timestamp, "current", Sign(timestamp, body), body),
            CancellationToken.None);

        Assert.Equal(WorkOrderWebhookStatus.Applied, result.Status);
        Assert.Equal(externalId, data.Mutation!.ExternalWorkOrderId);
        Assert.Equal(externalId, data.Mutation.WorkerOrderNumber);
    }

    [Theory]
    [InlineData(-300, WorkOrderWebhookStatus.Applied)]
    [InlineData(300, WorkOrderWebhookStatus.Applied)]
    [InlineData(-301, WorkOrderWebhookStatus.Unauthorized)]
    [InlineData(301, WorkOrderWebhookStatus.Unauthorized)]
    public async Task Timestamp_boundaries_are_enforced(
        int offsetSeconds,
        WorkOrderWebhookStatus expected)
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var body = ValidBody();
        var timestamp = Now.AddSeconds(offsetSeconds).ToUnixTimeSeconds().ToString();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(timestamp, "current", Sign(timestamp, body), body),
            CancellationToken.None);

        Assert.Equal(expected, result.Status);
        Assert.Equal(expected == WorkOrderWebhookStatus.Applied, data.Mutation != null);
    }

    [Fact]
    public async Task Tampered_body_is_rejected_before_parse_or_persistence()
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var signedBody = ValidBody();
        var tampered = Encoding.UTF8.GetBytes("{not-json");
        var timestamp = Now.ToUnixTimeSeconds().ToString();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(
                timestamp,
                "current",
                Sign(timestamp, signedBody),
                tampered),
            CancellationToken.None);

        Assert.Equal(WorkOrderWebhookStatus.Unauthorized, result.Status);
        Assert.Null(data.Mutation);
    }

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("v1=xyz")]
    public async Task Missing_or_malformed_signature_is_uniformly_unauthorized(string? signature)
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var body = ValidBody();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(
                Now.ToUnixTimeSeconds().ToString(),
                "current",
                signature,
                body),
            CancellationToken.None);

        Assert.Equal(WorkOrderWebhookStatus.Unauthorized, result.Status);
        Assert.Null(data.Mutation);
    }

    [Fact]
    public async Task Signed_malformed_known_type_is_invalid_without_persistence()
    {
        var data = new RecordingDataService();
        var service = CreateService(data);
        var body = Encoding.UTF8.GetBytes("""
            {"schema_version":"one","delivery_id":"d","event_type":"work_order.created",
             "occurred_at":"2026-07-24T12:00:00Z","source":"procurement-ingest/workorder-shoc-emitter","replay":false,
             "data":{"work_order_id":"123"}}
            """);
        var timestamp = Now.ToUnixTimeSeconds().ToString();

        var result = await service.ProcessAsync(
            new WorkOrderWebhookRequest(timestamp, "current", Sign(timestamp, body), body),
            CancellationToken.None);

        Assert.Equal(WorkOrderWebhookStatus.InvalidEnvelope, result.Status);
        Assert.Null(data.Mutation);
    }

    private static WorkOrderWebhookService CreateService(RecordingDataService data) =>
        new(
            new StaticSecretProvider(),
            data,
            new StaticOptionsMonitor<WorkOrderWebhookOptions>(new WorkOrderWebhookOptions
            {
                Enabled = true,
                AllowedClockSkewSeconds = 300,
                SecretId = "workorder-ingest/shoc-webhook-hmac"
            }),
            new FixedTimeProvider(Now),
            NullLogger<WorkOrderWebhookService>.Instance);

    private static byte[] ValidBody(
        string deliveryId = "delivery-1",
        string workOrderId = "WO-123",
        string source = "procurement-ingest/workorder-shoc-emitter") =>
        Encoding.UTF8.GetBytes(
            "{\"schema_version\":1,\"delivery_id\":\"" + deliveryId
            + "\",\"event_type\":\"work_order.created\","
            + "\"occurred_at\":\"2026-07-24T11:59:00Z\",\"source\":\"" + source + "\","
            + "\"replay\":false,\"data\":{\"work_order_id\":\"" + workOrderId + "\","
            + "\"title\":\"Leaking pipe\",\"wo_status\":\"new\",\"severity\":\"2\"}}");

    private static string Sign(string timestamp, byte[] body)
    {
        var prefix = Encoding.UTF8.GetBytes(timestamp + ".");
        var signed = new byte[prefix.Length + body.Length];
        prefix.CopyTo(signed, 0);
        body.CopyTo(signed, prefix.Length);
        return "v1=" + Convert.ToHexString(HMACSHA256.HashData(Secret, signed)).ToLowerInvariant();
    }

    private sealed class StaticSecretProvider : IWorkOrderWebhookSecretProvider
    {
        public Task<WorkOrderWebhookSecretResult> GetSecretAsync(
            string keyId,
            CancellationToken cancellationToken) =>
            Task.FromResult(keyId == "current"
                ? new WorkOrderWebhookSecretResult(
                    WorkOrderWebhookSecretStatus.Found,
                    (byte[])Secret.Clone())
                : new WorkOrderWebhookSecretResult(WorkOrderWebhookSecretStatus.UnknownKey));
    }

    private sealed class RecordingDataService : IWorkOrderWebhookDataService
    {
        public WorkOrderWebhookMutation? Mutation { get; private set; }
        public CancellationToken CancellationToken { get; private set; }

        public Task<WorkOrderWebhookPersistenceResult> ApplyAsync(
            WorkOrderWebhookMutation mutation,
            CancellationToken cancellationToken)
        {
            Mutation = mutation;
            CancellationToken = cancellationToken;
            return Task.FromResult(new WorkOrderWebhookPersistenceResult(
                WorkOrderWebhookPersistenceStatus.Applied));
        }
    }
}

public sealed class WorkOrderWebhookDataServiceTests
{
    [Fact]
    public async Task State_comment_staleness_and_delivery_deduplication_are_atomic()
    {
        await using var connection = new SqliteConnection("Data Source=:memory:");
        await connection.OpenAsync();
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseSqlite(connection)
            .Options;
        await using var context = new CountingDbContext(options);
        await context.Database.EnsureCreatedAsync();
        context.Accounts.Add(new Accounts { Id = 1, Name = "Webhook Customer", IsDeleted = false });
        await context.SaveChangesAsync();
        context.ResetSaveCount();
        var data = new WorkOrderWebhookDataService(context);

        var comment = Mutation(
            "comment-delivery",
            "hash-comment",
            "work_order.comment_added",
            new DateTimeOffset(2026, 7, 24, 10, 0, 0, TimeSpan.Zero),
            commentId: "comment-1");
        var commentResult = await data.ApplyAsync(comment, CancellationToken.None);

        Assert.Equal(WorkOrderWebhookPersistenceStatus.Applied, commentResult.Status);
        var skeleton = await context.workOrders.SingleAsync();
        Assert.Equal("123", skeleton.ExternalWorkOrderId);
        Assert.Equal("00000000001", skeleton.InternalWONumber);
        Assert.Equal("00000000123", skeleton.WorkerOrderNumber);
        Assert.Equal(skeleton.Id, (await context.Comments.SingleAsync()).WorkerOrderId);

        var state = Mutation(
            "state-delivery",
            "hash-state",
            "work_order.updated",
            new DateTimeOffset(2026, 7, 24, 12, 0, 0, TimeSpan.Zero),
            title: "Current title");
        await data.ApplyAsync(state, CancellationToken.None);

        var stale = Mutation(
            "stale-delivery",
            "hash-stale",
            "work_order.updated",
            new DateTimeOffset(2026, 7, 24, 11, 0, 0, TimeSpan.Zero),
            title: "Stale title");
        var staleResult = await data.ApplyAsync(stale, CancellationToken.None);

        Assert.True(staleResult.StateMutationSkipped);
        Assert.Equal("Current title", (await context.workOrders.SingleAsync()).WorkerOrderTitle);
        Assert.Equal(3, await context.WorkOrderWebhookDeliveries.CountAsync());

        var duplicate = await data.ApplyAsync(state, CancellationToken.None);
        Assert.Equal(WorkOrderWebhookPersistenceStatus.Duplicate, duplicate.Status);

        var conflict = await data.ApplyAsync(
            state with { BodySha256 = "different-hash" },
            CancellationToken.None);
        Assert.Equal(WorkOrderWebhookPersistenceStatus.HashConflict, conflict.Status);
        Assert.Equal(3, context.SaveCount);
    }

    [Fact]
    public async Task Cancel_event_forces_cancelled_status()
    {
        await using var connection = new SqliteConnection("Data Source=:memory:");
        await connection.OpenAsync();
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseSqlite(connection)
            .Options;
        await using var context = new ApplicationDbContext(options);
        await context.Database.EnsureCreatedAsync();
        context.Accounts.Add(new Accounts { Id = 1, Name = "Webhook Customer", IsDeleted = false });
        await context.SaveChangesAsync();
        var data = new WorkOrderWebhookDataService(context);
        var mutation = Mutation(
            "cancel-delivery",
            "hash",
            "work_order.cancelled",
            new DateTimeOffset(2026, 7, 24, 12, 0, 0, TimeSpan.Zero)) with
        {
            IsCancelled = true,
            Status = "Open",
            LifecycleStatus = LifecycleStatus.Canceled
        };

        await data.ApplyAsync(mutation, CancellationToken.None);

        Assert.Equal("Cancelled", (await context.workOrders.SingleAsync()).Status);
        Assert.Equal(LifecycleStatus.Canceled, (await context.workOrders.SingleAsync()).LifecycleStatus);
    }

    [Fact]
    public async Task Unmapped_imported_status_preserves_existing_lifecycle_status()
    {
        await using var connection = new SqliteConnection("Data Source=:memory:");
        await connection.OpenAsync();
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseSqlite(connection)
            .Options;
        await using var context = new ApplicationDbContext(options);
        await context.Database.EnsureCreatedAsync();
        context.workOrders.Add(new WorkOrder
        {
            ExternalWorkOrderId = "123",
            LifecycleStatus = LifecycleStatus.Scheduled
        });
        await context.SaveChangesAsync();
        var data = new WorkOrderWebhookDataService(context);

        await data.ApplyAsync(
            Mutation(
                "unmapped-status",
                "hash",
                "work_order.updated",
                new DateTimeOffset(2026, 7, 24, 12, 0, 0, TimeSpan.Zero)),
            CancellationToken.None);

        Assert.Equal(LifecycleStatus.Scheduled, (await context.workOrders.SingleAsync()).LifecycleStatus);
    }

    private static WorkOrderWebhookMutation Mutation(
        string deliveryId,
        string bodyHash,
        string eventType,
        DateTimeOffset occurredAt,
        string? title = null,
        string? commentId = null) =>
        new()
        {
            DeliveryId = deliveryId,
            EventType = eventType,
            OccurredAt = occurredAt,
            UpdatedAt = occurredAt,
            ProcessedAt = occurredAt.AddMinutes(1),
            BodySha256 = bodyHash,
            VersionHash = bodyHash,
            ExternalWorkOrderId = "123",
            WorkerOrderNumber = "00000000123",
            Source = "procurement",
            IsStateEvent = eventType != "work_order.comment_added",
            Title = title,
            Customer = "Webhook Customer",
            Status = "Open",
            CommentId = commentId,
            CommentText = commentId == null ? null : "A comment"
        };

    private sealed class CountingDbContext : ApplicationDbContext
    {
        public CountingDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }

        public int SaveCount { get; private set; }

        public void ResetSaveCount() => SaveCount = 0;

        public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
        {
            SaveCount++;
            return base.SaveChangesAsync(cancellationToken);
        }
    }
}

public sealed class WorkOrderWebhookControllerTests
{
    [Theory]
    [InlineData("text/plain")]
    [InlineData("application/xml")]
    public async Task Unsupported_media_type_is_rejected_before_service(string contentType)
    {
        var fake = new ControllerService();
        var controller = CreateController(fake, Encoding.UTF8.GetBytes("{}"), contentType);

        var result = await controller.Receive(CancellationToken.None);

        Assert.Equal(StatusCodes.Status415UnsupportedMediaType, Assert.IsType<StatusCodeResult>(result).StatusCode);
        Assert.False(fake.Called);
    }

    [Fact]
    public async Task Streaming_body_over_limit_is_rejected_before_service()
    {
        var fake = new ControllerService { MaximumBodyBytes = 4 };
        var controller = CreateController(
            fake,
            Encoding.UTF8.GetBytes("12345"),
            "application/json",
            contentLength: null);

        var result = await controller.Receive(CancellationToken.None);

        Assert.Equal(StatusCodes.Status413PayloadTooLarge, Assert.IsType<StatusCodeResult>(result).StatusCode);
        Assert.False(fake.Called);
    }

    [Fact]
    public async Task Valid_request_forwards_exact_body_and_cancellation()
    {
        var body = Encoding.UTF8.GetBytes("{\"x\":1}");
        var fake = new ControllerService();
        var controller = CreateController(fake, body, "application/json; charset=utf-8");
        controller.Request.Headers["X-SH-Timestamp"] = "1";
        controller.Request.Headers["X-SH-Key-Id"] = "key";
        controller.Request.Headers["X-SH-Signature"] = "sig";
        using var cts = new CancellationTokenSource();

        var result = await controller.Receive(cts.Token);

        Assert.IsType<OkObjectResult>(result);
        Assert.Equal(body, fake.Request!.Body);
        Assert.Equal(cts.Token, fake.CancellationToken);
    }

    private static WorkOrderWebhookController CreateController(
        ControllerService service,
        byte[] body,
        string contentType,
        long? contentLength = 0)
    {
        var context = new DefaultHttpContext();
        context.Request.Body = new MemoryStream(body);
        context.Request.ContentType = contentType;
        context.Request.ContentLength = contentLength == 0 ? body.Length : contentLength;
        return new WorkOrderWebhookController(service)
        {
            ControllerContext = new ControllerContext { HttpContext = context }
        };
    }

    private sealed class ControllerService : IWorkOrderWebhookService
    {
        public int MaximumBodyBytes { get; set; } = 1_048_576;
        public bool Called { get; private set; }
        public WorkOrderWebhookRequest? Request { get; private set; }
        public CancellationToken CancellationToken { get; private set; }

        public Task<WorkOrderWebhookResult> ProcessAsync(
            WorkOrderWebhookRequest request,
            CancellationToken cancellationToken)
        {
            Called = true;
            Request = request;
            CancellationToken = cancellationToken;
            return Task.FromResult(new WorkOrderWebhookResult(WorkOrderWebhookStatus.Applied));
        }
    }
}

internal sealed class FixedTimeProvider : TimeProvider
{
    private readonly DateTimeOffset _utcNow;

    public FixedTimeProvider(DateTimeOffset utcNow)
    {
        _utcNow = utcNow;
    }

    public override DateTimeOffset GetUtcNow() => _utcNow;
}

internal sealed class StaticOptionsMonitor<T> : IOptionsMonitor<T>
{
    public StaticOptionsMonitor(T value)
    {
        CurrentValue = value;
    }

    public T CurrentValue { get; }
    public T Get(string? name) => CurrentValue;
    public IDisposable? OnChange(Action<T, string?> listener) => null;
}