using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using SeaHaven.DataServices.Implementation;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.Services.Configuration;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Exceptions;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Interfaces;

namespace SeaHavenIndustries.Tests;

public class WorkOrderBoardCancelServiceTests
{
    private static (ApplicationDbContext Context, WorkOrderBoardCancelService Cancel, WorkOrderBoardUpdateService Update) CreateSut()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;
        var context = new ApplicationDbContext(options);
        var boardData = new WorkOrderBoardDataService(context);
        var mutationData = new WorkOrderBoardMutationDataService(context);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(context));
        var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
        var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
        var cancel = new WorkOrderBoardCancelService(mutationData, boardService, audit, new NoOpUpliftService(), new PassThroughUpliftData());
        var update = new WorkOrderBoardUpdateService(boardData, mutationData, audit);
        return (context, cancel, update);
    }

    private static string ToVersion(WorkOrder workOrder)
        => Convert.ToBase64String(workOrder.RowVersion ?? new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 });

    [Fact]
    public async Task Cancel_SetsLifecycleStatusCanceled()
    {
        var (context, cancel, _) = CreateSut();
        var wo = new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Incomplete,
            Status = "Incomplete",
            SiteCode = "BK5",
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        };
        context.workOrders.Add(wo);
        await context.SaveChangesAsync();

        var result = await cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1");

        Assert.Equal(LifecycleStatus.Canceled, result.LifecycleStatus);
        Assert.Equal("Canceled", result.LifecycleStatusLabel);
    }

    [Fact]
    public async Task Cancel_IsIdempotentWhenAlreadyCanceled()
    {
        var (context, cancel, _) = CreateSut();
        var wo = new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Canceled,
            Status = "Canceled",
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        };
        context.workOrders.Add(wo);
        await context.SaveChangesAsync();

        var before = await context.WorkOrderAuditLogs.CountAsync();
        var result = await cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1");
        var after = await context.WorkOrderAuditLogs.CountAsync();

        Assert.Equal(LifecycleStatus.Canceled, result.LifecycleStatus);
        Assert.Equal(before, after);
    }

    [Fact]
    public async Task Cancel_BlocksWhenCompleted()
    {
        var (context, cancel, _) = CreateSut();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Completed,
            Status = "Completed"
        });
        await context.SaveChangesAsync();

        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() => cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1"));
        Assert.Equal("CancelNotAllowed", ex.Code);
    }

    [Fact]
    public async Task Cancel_BlocksWhenClosedLabel()
    {
        var (context, cancel, _) = CreateSut();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Completed,
            Status = "Closed"
        });
        await context.SaveChangesAsync();

        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() => cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1"));
        Assert.Equal("CancelNotAllowed", ex.Code);
    }

    [Fact]
    public async Task Cancel_WritesStatusChangedAudit()
    {
        var (context, cancel, _) = CreateSut();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Scheduled,
            Status = "Scheduled",
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        });
        await context.SaveChangesAsync();

        await cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1");

        var log = await context.WorkOrderAuditLogs.SingleAsync(l => l.Action == "StatusChanged");
        Assert.Equal("Canceled", log.NewValue);
    }

    [Fact]
    public async Task Patch_AfterCancel_IsBlocked()
    {
        var (context, cancel, update) = CreateSut();
        var wo = new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Incomplete,
            Status = "Incomplete",
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        };
        context.workOrders.Add(wo);
        await context.SaveChangesAsync();

        await cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1");

        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() =>
            update.PatchFieldAsync(1, new SeaHaven.Services.DTOs.WorkOrderBoardPatchRequestDto
            {
                Field = WorkOrderBoardFieldNames.SiteCode,
                Value = "NEW",
                WorkOrderVersion = ToVersion(wo)
            }, "actor-1"));

        Assert.Equal("CanceledReadOnly", ex.Code);
    }

    [Fact]
    public async Task Cancel_WithdrawsPendingUpliftAndWritesAudit()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;
        await using var context = new ApplicationDbContext(options);
        await WorkOrderAccountTestHelpers.EnsureAccountAsync(context);
        context.Vendors.Add(new Vendor { Id = 1, CompanyName = "Acme HVAC" });
        context.Dispatches.Add(new Dispatch
        {
            Id = 10,
            VendorId = 1,
            WorkOrderId = 1,
            DispatchNumber = "DIS-10",
            Status = "Scheduled",
        });
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Incomplete,
            Status = "Incomplete",
            PrimaryDispatchId = 10,
            AccountId = 1,
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        });
        context.DispatchUpliftRequests.Add(new DispatchUpliftRequest
        {
            Id = 100,
            DispatchId = 10,
            RequestedNTE = 600m,
            Status = "Pending",
            RequiredTier = 1,
            NotificationStatus = "Pending",
        });
        await context.SaveChangesAsync();

        var boardData = new WorkOrderBoardDataService(context);
        var mutationData = new WorkOrderBoardMutationDataService(context);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(context));
        var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
        var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
        var uplifts = new WorkOrderUpliftService(
            new UpliftDataService(context),
            new DispatchDataService(context),
            new WorkOrderDetailDataService(context),
            WorkOrderAccountTestHelpers.Resolver(context),
            new UserDataService(context),
            new TeamPermissionOverrideDataService(context),
            new TeamPermissionPolicy(),
            TimeProvider.System,
            Options.Create(new ApprovalsOptions()));
        var cancel = new WorkOrderBoardCancelService(mutationData, boardService, audit, uplifts, new PassThroughUpliftData());

        var result = await cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1");

        Assert.Equal(LifecycleStatus.Canceled, result.LifecycleStatus);
        Assert.Equal("Withdrawn", Assert.Single(context.DispatchUpliftRequests).Status);
        Assert.Contains(context.WorkOrderAuditLogs, log => log.Action == "uplift_cancel");
        Assert.Contains(context.WorkOrderAuditLogs, log => log.Action == "StatusChanged");
    }

    [Fact]
    public async Task Cancel_LateSaveFailure_LeavesPendingUpliftAndOpenWorkOrder()
    {
        var databaseName = Guid.NewGuid().ToString();
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(databaseName)
            .Options;
        await using var context = new ApplicationDbContext(options);
        await WorkOrderAccountTestHelpers.EnsureAccountAsync(context);
        context.Vendors.Add(new Vendor { Id = 1, CompanyName = "Acme HVAC" });
        context.Dispatches.Add(new Dispatch
        {
            Id = 10,
            VendorId = 1,
            WorkOrderId = 1,
            DispatchNumber = "DIS-10",
            Status = "Scheduled",
        });
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Incomplete,
            Status = "Incomplete",
            PrimaryDispatchId = 10,
            AccountId = 1,
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        });
        context.DispatchUpliftRequests.Add(new DispatchUpliftRequest
        {
            Id = 100,
            DispatchId = 10,
            RequestedNTE = 600m,
            Status = "Pending",
            RequiredTier = 1,
            NotificationStatus = "Pending",
        });
        await context.SaveChangesAsync();

        var boardData = new WorkOrderBoardDataService(context);
        var mutationData = new WorkOrderBoardMutationDataService(context);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(context));
        var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
        var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
        var uplifts = new WorkOrderUpliftService(
            new UpliftDataService(context),
            new DispatchDataService(context),
            new WorkOrderDetailDataService(context),
            WorkOrderAccountTestHelpers.Resolver(context),
            new UserDataService(context),
            new TeamPermissionOverrideDataService(context),
            new TeamPermissionPolicy(),
            TimeProvider.System,
            Options.Create(new ApprovalsOptions()));
        var cancel = new WorkOrderBoardCancelService(
            new ThrowingSaveMutationData(mutationData),
            boardService,
            audit,
            uplifts,
            new PassThroughUpliftData());

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1"));

        await using var verify = new ApplicationDbContext(options);
        Assert.Equal(LifecycleStatus.Incomplete, Assert.Single(verify.workOrders).LifecycleStatus);
        Assert.Equal("Pending", Assert.Single(verify.DispatchUpliftRequests).Status);
        Assert.Empty(verify.WorkOrderAuditLogs);
    }

    [Fact]
    public async Task Cancel_SerializedWithCreate_DoesNotLeavePendingOnCanceledWorkOrder()
    {
        var databaseName = Guid.NewGuid().ToString();
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(databaseName)
            .Options;

        await using (var seed = new ApplicationDbContext(options))
        {
            await WorkOrderAccountTestHelpers.EnsureAccountAsync(seed);
            seed.Users.Add(new ApplicationUser
            {
                Id = "dispatcher-1",
                UserName = "dispatcher-1",
                FirstName = "Alex",
                LastName = "Dispatcher",
            });
            var adminRole = new IdentityRole("Admin");
            seed.Roles.Add(adminRole);
            seed.UserRoles.Add(new IdentityUserRole<string>
            {
                UserId = "dispatcher-1",
                RoleId = adminRole.Id,
            });
            seed.Vendors.Add(new Vendor { Id = 1, CompanyName = "Acme HVAC" });
            seed.Dispatches.Add(new Dispatch
            {
                Id = 10,
                VendorId = 1,
                WorkOrderId = 1,
                NTEAmount = 1000m,
                DispatchNumber = "DIS-10",
                Status = "Scheduled",
            });
            seed.workOrders.Add(new WorkOrder
            {
                Id = 1,
                InternalWONumber = "10000000001",
                PrimaryDispatchId = 10,
                AccountId = 1,
                WorkOrderType = WorkOrderType.PM,
                LifecycleStatus = LifecycleStatus.Incomplete,
                Status = "Incomplete",
                RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 },
            });
            await seed.SaveChangesAsync();
        }

        await using var createContext = new ApplicationDbContext(options);
        await using var cancelContext = new ApplicationDbContext(options);
        var createService = new WorkOrderUpliftService(
            new UpliftDataService(createContext),
            new DispatchDataService(createContext),
            new WorkOrderDetailDataService(createContext),
            WorkOrderAccountTestHelpers.Resolver(createContext),
            new UserDataService(createContext),
            new TeamPermissionOverrideDataService(createContext),
            new TeamPermissionPolicy(),
            TimeProvider.System,
            Options.Create(new ApprovalsOptions()));
        var boardData = new WorkOrderBoardDataService(cancelContext);
        var mutationData = new WorkOrderBoardMutationDataService(cancelContext);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(cancelContext));
        var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(cancelContext));
        var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(cancelContext), fieldLocks);
        var cancelUplifts = new WorkOrderUpliftService(
            new UpliftDataService(cancelContext),
            new DispatchDataService(cancelContext),
            new WorkOrderDetailDataService(cancelContext),
            WorkOrderAccountTestHelpers.Resolver(cancelContext),
            new UserDataService(cancelContext),
            new TeamPermissionOverrideDataService(cancelContext),
            new TeamPermissionPolicy(),
            TimeProvider.System,
            Options.Create(new ApprovalsOptions()));
        var cancel = new WorkOrderBoardCancelService(
            mutationData,
            boardService,
            audit,
            cancelUplifts,
            new UpliftDataService(cancelContext));

        await Task.WhenAll(
            createService.CreateAsync(
                1,
                new CreateWorkOrderUpliftRequestDto { Amount = 501m, Notes = "Pending" },
                WorkOrderAccountTestHelpers.OrgWideAdmin("dispatcher-1"),
                CancellationToken.None),
            cancel.CancelAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin(), "actor-1"));

        await using var verify = new ApplicationDbContext(options);
        var workOrder = Assert.Single(verify.workOrders);
        Assert.Equal(LifecycleStatus.Canceled, workOrder.LifecycleStatus);
        Assert.DoesNotContain(verify.DispatchUpliftRequests, row => row.Status == "Pending");
    }

    private sealed class ThrowingSaveMutationData : IWorkOrderBoardMutationDataService
    {
        private readonly IWorkOrderBoardMutationDataService _inner;

        public ThrowingSaveMutationData(IWorkOrderBoardMutationDataService inner)
        {
            _inner = inner;
        }

        public Task<bool> VendorExistsAsync(int vendorId, CancellationToken cancellationToken)
            => _inner.VendorExistsAsync(vendorId, cancellationToken);

        public Task<int> GetMaxWorkOrderIdAsync(CancellationToken cancellationToken)
            => _inner.GetMaxWorkOrderIdAsync(cancellationToken);

        public Task<WorkOrder?> GetTrackedWorkOrderAsync(int workOrderId, CancellationToken cancellationToken)
            => _inner.GetTrackedWorkOrderAsync(workOrderId, cancellationToken);

        public Task<Dispatch?> GetTrackedDispatchAsync(int dispatchId, int workOrderId, CancellationToken cancellationToken)
            => _inner.GetTrackedDispatchAsync(dispatchId, workOrderId, cancellationToken);

        public Task<Dispatch?> GetTrackedDispatchByIdAsync(int dispatchId, CancellationToken cancellationToken)
            => _inner.GetTrackedDispatchByIdAsync(dispatchId, cancellationToken);

        public void DetachWorkOrderFromDispatch(Dispatch dispatch, int workOrderId)
            => _inner.DetachWorkOrderFromDispatch(dispatch, workOrderId);

        public void TrackNewWorkOrder(WorkOrder workOrder) => _inner.TrackNewWorkOrder(workOrder);

        public void TrackNewDispatch(Dispatch dispatch) => _inner.TrackNewDispatch(dispatch);

        public void TrackWorkOrderContact(int workOrderId, int contactId, string? notes)
            => _inner.TrackWorkOrderContact(workOrderId, contactId, notes);

        public void SetExpectedWorkOrderVersion(WorkOrder workOrder, byte[] version)
            => _inner.SetExpectedWorkOrderVersion(workOrder, version);

        public void SetExpectedDispatchVersion(Dispatch dispatch, byte[] version)
            => _inner.SetExpectedDispatchVersion(dispatch, version);

        public bool HasPendingChanges() => _inner.HasPendingChanges();

        public Task ExecuteTransactionalAsync(Func<CancellationToken, Task> work, CancellationToken cancellationToken)
            => _inner.ExecuteTransactionalAsync(work, cancellationToken);

        public Task<BoardSaveOutcome> SaveAsync(CancellationToken cancellationToken)
            => throw new InvalidOperationException("forced late failure");
    }

    /// <summary>
    /// SH-196: the cancel flow now runs inside the per-work-order gate. Tests only need the
    /// gate to invoke the work; the real serialization is exercised against SQL Server.
    /// </summary>
    private sealed class PassThroughUpliftData : IUpliftDataService
    {
        public Task<T> ExecuteWorkOrderMutationAsync<T>(
            int workOrderId,
            Func<CancellationToken, Task<T>> work,
            CancellationToken cancellationToken) => work(cancellationToken);

        public Task<(int TotalCount, IReadOnlyList<UpliftListItemData> Items)> GetPagedAsync(
            string? status, int? tier, int page, int pageSize, CancellationToken cancellationToken) =>
            throw new NotSupportedException();
        public Task<IReadOnlyList<UpliftForDispatchData>> GetForDispatchAsync(int dispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<IReadOnlyList<UpliftForWorkOrderData>> GetForWorkOrderAsync(int workOrderId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<DispatchUpliftRequest?> GetByIdAndWorkOrderAsync(int requestId, int workOrderId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<IReadOnlyList<PortalUpliftData>> GetForVendorDispatchAsync(int dispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<DispatchUpliftRequest?> GetByIdAsync(int id, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<int?> GetWorkOrderIdForUpliftAsync(int upliftRequestId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<DispatchUpliftRequest?> GetByIdAndDispatchAsync(int requestId, int dispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<UpliftEvidenceDownloadData?> GetEvidenceForInternalDownloadAsync(int upliftRequestId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<bool> HasPendingAsync(int dispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<bool> HasPendingForWorkOrderAsync(int workOrderId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<Dispatch?> GetUpliftDispatchForWorkOrderAsync(int workOrderId, int? primaryDispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<decimal> SumAutoApprovedAmountForWorkOrderAsync(int workOrderId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<IReadOnlyList<WorkOrderUpliftExposureData>> GetApprovedExposureForWorkOrdersAsync(IReadOnlyCollection<int> workOrderIds, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<decimal> GetPendingExposureTotalAsync(CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<List<DispatchUpliftRequest>> GetPendingForWorkOrderAsync(int workOrderId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<bool> HasActiveAsync(int dispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<DispatchUpliftRequest?> GetActiveRequestAsync(int dispatchId, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<DispatchUpliftRequest?> GetByRequestKeyAsync(int dispatchId, string requestKey, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<List<DispatchUpliftRequest>> GetDueForExpiryAsync(DateTime utcNow, int count, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<List<DispatchUpliftRequest>> GetDueForInitialNotificationAsync(int count, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task<List<DispatchUpliftRequest>> GetDueForEscalationAsync(int count, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task StageAsync(DispatchUpliftRequest request, CancellationToken cancellationToken) => throw new NotSupportedException();
        public Task SaveChangesAsync(CancellationToken cancellationToken) => throw new NotSupportedException();
    }

    private sealed class NoOpUpliftService : IWorkOrderUpliftService
    {
        public Task<IReadOnlyList<WorkOrderUpliftDto>?> ListAsync(
            int workOrderId,
            System.Security.Claims.ClaimsPrincipal user,
            CancellationToken cancellationToken) =>
            Task.FromResult<IReadOnlyList<WorkOrderUpliftDto>?>(Array.Empty<WorkOrderUpliftDto>());

        public Task<WorkOrderUpliftDto?> CreateAsync(
            int workOrderId,
            CreateWorkOrderUpliftRequestDto request,
            System.Security.Claims.ClaimsPrincipal user,
            CancellationToken cancellationToken) =>
            Task.FromResult<WorkOrderUpliftDto?>(null);

        public Task<WorkOrderUpliftDto?> CancelAsync(
            int workOrderId,
            int upliftId,
            System.Security.Claims.ClaimsPrincipal user,
            CancellationToken cancellationToken) =>
            Task.FromResult<WorkOrderUpliftDto?>(null);

        public Task<WorkOrderUpliftDto?> RevokeAsync(
            int workOrderId,
            int upliftId,
            RevokeWorkOrderUpliftRequestDto request,
            System.Security.Claims.ClaimsPrincipal user,
            CancellationToken cancellationToken) =>
            Task.FromResult<WorkOrderUpliftDto?>(null);

        public Task WithdrawPendingForWorkOrderAsync(
            int workOrderId,
            string? actorId,
            CancellationToken cancellationToken) => Task.CompletedTask;
    }
}