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

namespace SeaHavenIndustries.Tests;

// An uplift's amount is the NTE increase being requested. Work-order requests store
// that increase in RequestedNTE; vendor-portal requests store the requested NTE total.
// These tests walk each path through the approvals queue, approve and revoke, and the
// queue-wide and per-work-order exposure totals.
public sealed class UpliftAmountPerCreationPathTests
{
    private const string DispatcherId = "dispatcher-1";
    private const int WorkOrderId = 1;
    private const int PrimaryDispatchId = 10;
    private const int SecondDispatchId = 11;

    private static ApplicationDbContext CreateContext() =>
        new(new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options);

    private static ApprovalsOptions NewOptions() => new()
    {
        UpliftTier1MaxUsd = 2500m,
        Tier1Roles = new[] { "Approver" },
        Tier2Roles = new[] { "Manager" },
    };

    private static WorkOrderUpliftService NewWorkOrderUpliftService(ApplicationDbContext context) =>
        new(new UpliftDataService(context),
            new DispatchDataService(context),
            new WorkOrderDetailDataService(context),
            WorkOrderAccountTestHelpers.Resolver(context),
            new UserDataService(context),
            new TeamPermissionOverrideDataService(context),
            new TeamPermissionPolicy(),
            TimeProvider.System,
            Options.Create(NewOptions()));

    private static UpliftService NewQueueService(ApplicationDbContext context) =>
        new(new UpliftDataService(context),
            new DispatchDataService(context),
            new NoDocumentStorage(),
            TimeProvider.System,
            Options.Create(NewOptions()));

    private static ClaimsPrincipal Admin(string userId = DispatcherId) =>
        WorkOrderAccountTestHelpers.OrgWideAdmin(userId);

    private static Dispatch DispatchOf(ApplicationDbContext context, int id) =>
        context.Dispatches.Single(d => d.Id == id);

    // A work order with a 600 NTE on its primary dispatch, and a second dispatch on the
    // same work order, also at 600.
    private static async Task SeedWorkOrderAsync(ApplicationDbContext context)
    {
        await WorkOrderAccountTestHelpers.EnsureAccountAsync(context);
        context.Users.Add(new ApplicationUser
        {
            Id = DispatcherId,
            UserName = DispatcherId,
            FirstName = "Alex",
            LastName = "Dispatcher",
        });
        var role = new IdentityRole("Admin");
        context.Roles.Add(role);
        context.UserRoles.Add(new IdentityUserRole<string> { UserId = DispatcherId, RoleId = role.Id });
        context.Vendors.Add(new Vendor { Id = 1, CompanyName = "Acme HVAC" });
        context.Dispatches.AddRange(
            new Dispatch
            {
                Id = PrimaryDispatchId,
                VendorId = 1,
                WorkOrderId = WorkOrderId,
                NTEAmount = 600m,
                DispatchNumber = "DIS-10",
                Status = "Completed",
            },
            new Dispatch
            {
                Id = SecondDispatchId,
                VendorId = 1,
                WorkOrderId = WorkOrderId,
                NTEAmount = 600m,
                DispatchNumber = "DIS-11",
                Status = "Completed",
            });
        context.workOrders.Add(new WorkOrder
        {
            Id = WorkOrderId,
            InternalWONumber = "10000000001",
            PrimaryDispatchId = PrimaryDispatchId,
            AccountId = 1,
            WorkOrderType = WorkOrderType.PM,
        });
        await context.SaveChangesAsync();
    }

    // Uses up the work order's auto-approval allowance, so a new work-order request
    // waits for approval instead of auto-approving.
    private static async Task ConsumeAutoApprovalAllowanceAsync(ApplicationDbContext context)
    {
        context.DispatchUpliftRequests.Add(new DispatchUpliftRequest
        {
            DispatchId = SecondDispatchId,
            CurrentNTE = 100m,
            RequestedNTE = 500m,
            Status = "NoApprovalRequired",
            RequiredTier = 0,
            NotificationStatus = "Sent",
            createdby = DispatcherId,
            CreatedDate = new DateTime(2026, 1, 2),
        });
        await context.SaveChangesAsync();
    }

    private static async Task<int> CreatePendingWorkOrderRequestAsync(ApplicationDbContext context, decimal amount)
    {
        await ConsumeAutoApprovalAllowanceAsync(context);
        var created = await NewWorkOrderUpliftService(context).CreateAsync(
            WorkOrderId,
            new CreateWorkOrderUpliftRequestDto { Amount = amount, Notes = "Extra parts" },
            Admin(),
            CancellationToken.None);
        Assert.Equal("pending", created!.Status);
        return created.Id;
    }

    // Stored exactly as the vendor portal writes it: no identity user, and RequestedNTE
    // is the requested new NTE total.
    private static async Task<int> SeedVendorRequestAsync(
        ApplicationDbContext context, int dispatchId, decimal currentNte, decimal requestedTotal)
    {
        var request = new DispatchUpliftRequest
        {
            DispatchId = dispatchId,
            CurrentNTE = currentNte,
            RequestedNTE = requestedTotal,
            Status = "Pending",
            RequiredTier = 1,
            RequestedByVendorName = "Acme HVAC",
            NotificationStatus = "Sent",
            CreatedDate = new DateTime(2026, 3, 1),
        };
        context.DispatchUpliftRequests.Add(request);
        await context.SaveChangesAsync();
        return request.Id;
    }

    private static Task<WorkOrderUpliftDto?> RevokeAsync(ApplicationDbContext context, int upliftId) =>
        NewWorkOrderUpliftService(context).RevokeAsync(
            WorkOrderId,
            upliftId,
            new RevokeWorkOrderUpliftRequestDto { Reason = "Scope reduced" },
            Admin(),
            CancellationToken.None);

    [Fact]
    public async Task WorkOrderRequest_QueueShowsTheRequestedIncrease()
    {
        await using var context = CreateContext();
        await SeedWorkOrderAsync(context);
        var upliftId = await CreatePendingWorkOrderRequestAsync(context, 90m);

        var pending = await NewQueueService(context)
            .ListAsync(Admin(), "Pending", null, 1, 25, CancellationToken.None);

        Assert.Equal(90m, Assert.Single(pending.Items, i => i.Id == upliftId).Delta);
    }

    [Fact]
    public async Task WorkOrderRequest_ApproveAddsIncreaseToNte_RevokeRestoresNte()
    {
        await using var context = CreateContext();
        await SeedWorkOrderAsync(context);
        var upliftId = await CreatePendingWorkOrderRequestAsync(context, 90m);
        var queue = NewQueueService(context);

        var approved = await queue.ApproveAsync(Admin(), upliftId, null, CancellationToken.None);
        Assert.Equal(690m, approved.NTEAmount);
        Assert.Equal(690m, DispatchOf(context, PrimaryDispatchId).NTEAmount);

        var revoked = await RevokeAsync(context, upliftId);
        Assert.Equal("revoked", revoked!.Status);
        Assert.Equal(600m, DispatchOf(context, PrimaryDispatchId).NTEAmount);
    }

    [Fact]
    public async Task VendorRequest_QueueShowsIncrease_ApproveEndsAtRequestedTotal_RevokeRestoresNte()
    {
        await using var context = CreateContext();
        await SeedWorkOrderAsync(context);
        var upliftId = await SeedVendorRequestAsync(context, PrimaryDispatchId, currentNte: 600m, requestedTotal: 900m);
        var queue = NewQueueService(context);

        var pending = await queue.ListAsync(Admin(), "Pending", null, 1, 25, CancellationToken.None);
        Assert.Equal(300m, Assert.Single(pending.Items).Delta);

        var approved = await queue.ApproveAsync(Admin(), upliftId, null, CancellationToken.None);
        Assert.Equal(900m, approved.NTEAmount);
        Assert.Equal(900m, DispatchOf(context, PrimaryDispatchId).NTEAmount);

        var revoked = await RevokeAsync(context, upliftId);
        Assert.Equal("revoked", revoked!.Status);
        Assert.Equal(600m, DispatchOf(context, PrimaryDispatchId).NTEAmount);
    }

    [Fact]
    public async Task PendingExposureAndApprovedOnWorkOrder_SumEachRequestsIncrease()
    {
        await using var context = CreateContext();
        await SeedWorkOrderAsync(context);
        var workOrderRequestId = await CreatePendingWorkOrderRequestAsync(context, 90m);
        var vendorRequestId = await SeedVendorRequestAsync(context, SecondDispatchId, currentNte: 600m, requestedTotal: 900m);
        var queue = NewQueueService(context);

        var pending = await queue.ListAsync(Admin(), "Pending", null, 1, 25, CancellationToken.None);
        Assert.Equal(390m, pending.PendingExposureTotal);
        Assert.Equal(pending.Items.Sum(i => i.Delta), pending.PendingExposureTotal);

        await queue.ApproveAsync(Admin(), workOrderRequestId, null, CancellationToken.None);
        await queue.ApproveAsync(Admin(), vendorRequestId, null, CancellationToken.None);

        var decided = await queue.ListAsync(Admin(), "Approved", null, 1, 25, CancellationToken.None);
        var row = Assert.Single(decided.Items, i => i.Id == workOrderRequestId);
        Assert.Equal(390m, row.WorkOrderAdminApprovedTotal);
        // The earlier auto-approved work-order request counts its stored increase.
        Assert.Equal(500m, row.WorkOrderAutoApprovedTotal);
        Assert.Equal(0m, (await queue.ListAsync(Admin(), "Pending", null, 1, 25, CancellationToken.None)).PendingExposureTotal);
    }

    [Fact]
    public async Task AutoApprovedWorkOrderRequest_ConsumesAllowanceByItsRequestedIncrease()
    {
        await using var context = CreateContext();
        await SeedWorkOrderAsync(context);

        var created = await NewWorkOrderUpliftService(context).CreateAsync(
            WorkOrderId,
            new CreateWorkOrderUpliftRequestDto { Amount = 400m, Notes = "Within limit" },
            Admin(),
            CancellationToken.None);

        Assert.Equal("auto_approved", created!.Status);
        var stored = context.DispatchUpliftRequests.Single(u => u.Id == created.Id);
        Assert.Equal(DispatcherId, stored.createdby);
        Assert.Equal(400m, stored.RequestedNTE);
        Assert.Equal(1000m, DispatchOf(context, PrimaryDispatchId).NTEAmount);
        Assert.Equal(400m, await new UpliftDataService(context)
            .SumAutoApprovedAmountForWorkOrderAsync(WorkOrderId, CancellationToken.None));
    }

    [Fact]
    public async Task WorkOrderUpliftList_ShowsEachRequestsIncrease()
    {
        await using var context = CreateContext();
        await SeedWorkOrderAsync(context);
        var workOrderRequestId = await CreatePendingWorkOrderRequestAsync(context, 90m);
        var vendorRequestId = await SeedVendorRequestAsync(context, SecondDispatchId, currentNte: 600m, requestedTotal: 900m);

        var uplifts = await NewWorkOrderUpliftService(context)
            .ListAsync(WorkOrderId, Admin(), CancellationToken.None);

        Assert.Equal(90m, Assert.Single(uplifts!, u => u.Id == workOrderRequestId).Amount);
        Assert.Equal(300m, Assert.Single(uplifts!, u => u.Id == vendorRequestId).Amount);
    }

    [Theory]
    [InlineData(DispatcherId, 90, "$90.00")]
    [InlineData(null, 900, "$300.00")]
    public void NotificationDeltaRow_ShowsTheRequestedIncrease(string? createdBy, int requestedNte, string expectedDelta)
    {
        var dispatch = new Dispatch { Id = PrimaryDispatchId, DispatchNumber = "DIS-10", NTEAmount = 600m };
        var request = new DispatchUpliftRequest
        {
            DispatchId = PrimaryDispatchId,
            CurrentNTE = 600m,
            RequestedNTE = requestedNte,
            RequiredTier = 1,
            createdby = createdBy,
        };

        // Builds the message content only; nothing is sent.
        var (_, body) = UpliftNotificationMessage.BuildInitial(dispatch, request, "Acme HVAC", "https://example.test");

        Assert.Contains(
            $"<strong>Delta</strong></td><td style='padding:4px 10px;'>{expectedDelta}</td>",
            body);
    }

    [Fact]
    public void AmountDefinition_TranslatesToSqlServer_ForRowAndGroupedSums()
    {
        // ToQueryString only builds SQL; it never opens the connection.
        using var context = new ApplicationDbContext(new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseSqlServer("Server=translation-only;Database=none;Trusted_Connection=True;")
            .Options);

        var rowSql = context.DispatchUpliftRequests
            .Select(UpliftAmount.ForQuery)
            .ToQueryString();
        var groupedSql = context.DispatchUpliftRequests
            .GroupBy(u => new { u.DispatchId, u.Status }, UpliftAmount.ForQuery)
            .Select(g => new { g.Key.DispatchId, g.Key.Status, Total = g.Sum() })
            .ToQueryString();

        Assert.Contains("CASE", rowSql);
        Assert.Contains("[createdby] IS NULL", rowSql);
        Assert.Contains("SUM(CASE", groupedSql);
        Assert.Contains("GROUP BY", groupedSql);
    }

    private sealed class NoDocumentStorage : IVendorDocumentStoragePort
    {
        public Task SaveAsync(int vendorId, int dispatchId, string storedFileName, Stream content, CancellationToken cancellationToken) =>
            Task.CompletedTask;

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

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