using System.Security.Claims;
using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using SeaHaven.DataServices.Implementation;
using SeaHaven.Services.Configuration;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Interfaces;
using Xunit;

namespace SeaHavenIndustries.Tests;

public sealed class WorkOrderUpliftEvidenceServiceTests
{
    private static ApplicationDbContext CreateContext()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;
        return new ApplicationDbContext(options);
    }

    private static async Task<WorkOrder> SeedWorkOrderAsync(ApplicationDbContext context)
    {
        await WorkOrderAccountTestHelpers.EnsureAccountAsync(context);
        context.Users.Add(new ApplicationUser
        {
            Id = "dispatcher-1",
            UserName = "dispatcher-1",
            FirstName = "Alex",
            LastName = "Dispatcher",
        });
        context.Vendors.Add(new Vendor { Id = 1, CompanyName = "Acme HVAC" });
        context.Dispatches.Add(new Dispatch
        {
            Id = 10,
            VendorId = 1,
            WorkOrderId = 1,
            NTEAmount = 1000m,
            DispatchNumber = "DIS-10",
            Status = "Scheduled",
        });
        var workOrder = new WorkOrder
        {
            Id = 1,
            InternalWONumber = "10000000001",
            PrimaryDispatchId = 10,
            AccountId = 1,
            WorkOrderType = WorkOrderType.PM,
        };
        context.workOrders.Add(workOrder);
        await context.SaveChangesAsync();
        return workOrder;
    }

    private static (WorkOrderUpliftEvidenceService Service, MemoryStorage Storage) NewService(
        ApplicationDbContext context,
        bool passWhenScannerUnavailable = false)
    {
        var storage = new MemoryStorage();
        var service = new WorkOrderUpliftEvidenceService(
            new WorkOrderDetailDataService(context),
            new DispatchDataService(context),
            new VendorDocumentDataService(context),
            storage,
            WorkOrderAccountTestHelpers.Resolver(context),
            Options.Create(new VendorDocumentsOptions
            {
                PassWhenScannerUnavailable = passWhenScannerUnavailable,
            }));
        return (service, storage);
    }

    private static ClaimsPrincipal Dispatcher()
        => WorkOrderAccountTestHelpers.OrgWideAdmin("dispatcher-1");

    private static FormFile FormFile(byte[] bytes, string fileName, string contentType)
    {
        return new FormFile(new MemoryStream(bytes), 0, bytes.Length, "file", fileName)
        {
            Headers = new HeaderDictionary(),
            ContentType = contentType,
        };
    }

    [Fact]
    public async Task UploadAsync_StoresPendingUpliftEvidenceForThePrimaryDispatch()
    {
        await using var context = CreateContext();
        var workOrder = await SeedWorkOrderAsync(context);
        var (service, storage) = NewService(context);
        var pdf = "%PDF-1.4"u8.ToArray();

        var uploaded = await service.UploadAsync(
            workOrder.Id,
            FormFile(pdf, "quote.pdf", "application/pdf"),
            Dispatcher(),
            CancellationToken.None);

        var document = Assert.Single(context.VendorCompletionDocuments);
        Assert.Equal(document.Id, uploaded!.Id);
        Assert.Equal("Pending", uploaded.ScanStatus);
        Assert.Null(document.ScannedAt);
        Assert.Equal(VendorDocumentPurpose.UpliftEvidence, document.Purpose);
        Assert.Equal(1, document.VendorId);
        Assert.Equal(10, document.DispatchId);
        Assert.Equal("quote.pdf", document.OriginalFileName);
        Assert.Null(document.ReplacesDocumentId);
        var saved = Assert.Single(storage.Saved);
        Assert.Equal((1, 10), (saved.VendorId, saved.DispatchId));
        var audit = Assert.Single(context.WorkOrderAuditLogs);
        Assert.Equal("uplift_evidence_uploaded", audit.Action);
        Assert.Equal("internal", audit.ActorType);
        Assert.Equal("dispatcher-1", audit.UserId);
    }

    [Fact]
    public async Task UploadAsync_PassWhenScannerUnavailable_StoresPassedEvidence()
    {
        await using var context = CreateContext();
        var workOrder = await SeedWorkOrderAsync(context);
        var (service, _) = NewService(context, passWhenScannerUnavailable: true);

        var uploaded = await service.UploadAsync(
            workOrder.Id,
            FormFile("%PDF-1.4"u8.ToArray(), "quote.pdf", "application/pdf"),
            Dispatcher(),
            CancellationToken.None);

        var document = Assert.Single(context.VendorCompletionDocuments);
        Assert.Equal("Passed", uploaded!.ScanStatus);
        Assert.Equal("Passed", document.ScanStatus);
        Assert.NotNull(document.ScannedAt);
        Assert.Equal("Processing", document.ReviewStatus);
    }

    [Fact]
    public async Task UploadAsync_MismatchedSignature_SavesNothing()
    {
        await using var context = CreateContext();
        var workOrder = await SeedWorkOrderAsync(context);
        var (service, storage) = NewService(context);

        var ex = await Assert.ThrowsAsync<InvalidOperationException>(() =>
            service.UploadAsync(
                workOrder.Id,
                FormFile("not a pdf"u8.ToArray(), "quote.pdf", "application/pdf"),
                Dispatcher(),
                CancellationToken.None));

        Assert.Contains("signature", ex.Message, StringComparison.OrdinalIgnoreCase);
        Assert.Empty(context.VendorCompletionDocuments);
        Assert.Empty(storage.Saved);
    }

    [Fact]
    public async Task GetStatusAsync_ReturnsScanStatusOnlyForUpliftEvidenceOnTheDispatch()
    {
        await using var context = CreateContext();
        var workOrder = await SeedWorkOrderAsync(context);
        var (service, _) = NewService(context);
        var uploaded = await service.UploadAsync(
            workOrder.Id,
            FormFile("%PDF-1.4"u8.ToArray(), "quote.pdf", "application/pdf"),
            Dispatcher(),
            CancellationToken.None);

        var pending = await service.GetStatusAsync(workOrder.Id, uploaded!.Id, Dispatcher(), CancellationToken.None);
        Assert.Equal("Pending", pending!.ScanStatus);
        Assert.Equal("quote.pdf", pending.OriginalFileName);

        var stored = Assert.Single(context.VendorCompletionDocuments);
        stored.ScanStatus = "Passed";
        context.VendorCompletionDocuments.Add(new VendorCompletionDocument
        {
            Id = 90,
            VendorId = 1,
            DispatchId = 10,
            WorkOrderId = workOrder.Id,
            OriginalFileName = "done.pdf",
            StoredFileName = "done.pdf",
            ContentType = "application/pdf",
            Purpose = "Completion",
            ScanStatus = "Passed",
            Version = 1,
        });
        await context.SaveChangesAsync();

        var passed = await service.GetStatusAsync(workOrder.Id, uploaded.Id, Dispatcher(), CancellationToken.None);
        Assert.Equal("Passed", passed!.ScanStatus);
        Assert.Null(await service.GetStatusAsync(workOrder.Id, 90, Dispatcher(), CancellationToken.None));
    }

    private sealed class MemoryStorage : IVendorDocumentStoragePort
    {
        public List<(int VendorId, int DispatchId, string Name)> Saved { get; } = new();

        public async Task SaveAsync(
            int vendorId,
            int dispatchId,
            string storedFileName,
            Stream content,
            CancellationToken cancellationToken)
        {
            using var buffer = new MemoryStream();
            await content.CopyToAsync(buffer, cancellationToken);
            Saved.Add((vendorId, dispatchId, storedFileName));
        }

        public Stream OpenRead(int vendorId, int dispatchId, string storedFileName)
            => throw new NotSupportedException();

        public void Delete(int vendorId, int dispatchId, string storedFileName)
        {
        }
    }
}