using System.Collections;
using System.Security.Claims;
using Api.SeaHavenIndustries.Controllers;
using Data.SeaHavenIndustries;
using FluentAssertions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Implementation;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Implementation;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

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

    private static VendorOperationsController NewController(ApplicationDbContext context)
    {
        var dataService = new VendorOperationsDataService(context, new DispatchDataService(context));
        var service = new VendorOperationsService(dataService, TimeProvider.System);
        var controller = new VendorOperationsController(service);
        controller.ControllerContext = new ControllerContext
        {
            HttpContext = new DefaultHttpContext
            {
                User = new ClaimsPrincipal(new ClaimsIdentity(
                    new[] { new Claim(ClaimTypes.NameIdentifier, "test-user") }, "test"))
            }
        };
        return controller;
    }

    private static object Prop(object source, string name) =>
        source.GetType().GetProperty(name)!.GetValue(source)!;

    [Fact]
    public async Task Notifications_ReturnsUnassignedWorkOrderInsideFortyEightHours()
    {
        using var context = NewContext();
        context.workOrders.Add(new WorkOrder
        {
            InternalWONumber = "WO-48",
            WorkerOrderTitle = "Needs vendor",
            ScheduledDate = DateTime.UtcNow.AddHours(47)
        });
        await context.SaveChangesAsync();

        var result = await NewController(context).GetNotifications(CancellationToken.None);

        var value = ((OkObjectResult)result).Value!;
        var items = ((IEnumerable)Prop(value, "Items")).Cast<object>().ToList();
        items.Should().ContainSingle();
        Prop(items[0], "Type").Should().Be("NoVendor");
        Prop(items[0], "Title").Should().Be("No vendor assigned — 48h to service");
    }

    [Fact]
    public async Task Notifications_RemovesReminderAsSoonAsVendorIsAssigned()
    {
        using var context = NewContext();
        var vendor = new Vendor { CompanyName = "Gateway", IsActive = true };
        var workOrder = new WorkOrder
        {
            InternalWONumber = "WO-ASSIGNED",
            ScheduledDate = DateTime.UtcNow.AddHours(24)
        };
        context.AddRange(vendor, workOrder);
        await context.SaveChangesAsync();
        context.Dispatches.Add(new Dispatch
        {
            VendorId = vendor.Id,
            WorkOrderId = workOrder.Id,
            Status = "Sent",
            ScheduledDate = workOrder.ScheduledDate
        });
        await context.SaveChangesAsync();

        var result = await NewController(context).GetNotifications(CancellationToken.None);

        var items = ((IEnumerable)Prop(((OkObjectResult)result).Value!, "Items")).Cast<object>();
        items.Should().BeEmpty();
    }

    [Fact]
    public async Task Availability_SurfacesOverlapAndRanksPreferredVendorFirst()
    {
        using var context = NewContext();
        var site = new Locations { Name = "St Louis" };
        var preferred = new Vendor
        {
            CompanyName = "Preferred",
            ContactName = "Alex",
            IsActive = true,
            TradeSpecialties = "HVAC",
            AvailabilityStatus = "Available",
            AvailabilityUpdatedAt = DateTime.UtcNow
        };
        var busy = new Vendor { CompanyName = "Busy", ContactName = "Sam", IsActive = true };
        var workOrder = new WorkOrder
        {
            InternalWONumber = "WO-BUSY",
            ScheduledStart = DateTime.UtcNow.AddHours(1),
            ScheduledEnd = DateTime.UtcNow.AddHours(3)
        };
        context.AddRange(site, preferred, busy, workOrder);
        await context.SaveChangesAsync();
        context.SitePreferredVendors.Add(new SitePreferredVendor
        {
            LocationId = site.Id,
            VendorId = preferred.Id,
            Trade = "HVAC",
            SortOrder = 0
        });
        context.Dispatches.Add(new Dispatch
        {
            VendorId = busy.Id,
            WorkOrderId = workOrder.Id,
            Status = "Sent",
            ScheduledDate = workOrder.ScheduledStart
        });
        await context.SaveChangesAsync();

        var result = await NewController(context).GetAvailability(
            DateTime.UtcNow.AddHours(2),
            DateTime.UtcNow.AddHours(4),
            site.Id,
            "HVAC",
            CancellationToken.None);

        var rows = ((IEnumerable)Prop(((OkObjectResult)result).Value!, "Data")).Cast<object>().ToList();
        Prop(rows[0], "CompanyName").Should().Be("Preferred");
        Prop(rows[0], "IsPreferred").Should().Be(true);
        var busyRow = rows.Single(row => (string?)Prop(row, "CompanyName") == "Busy");
        Prop(busyRow, "AvailabilityStatus").Should().Be("Unavailable");
    }

    [Fact]
    public async Task ReplaceSitePreferences_RejectsInactiveVendor()
    {
        using var context = NewContext();
        var site = new Locations { Name = "St Louis" };
        var inactive = new Vendor { CompanyName = "Inactive", IsActive = false };
        context.AddRange(site, inactive);
        await context.SaveChangesAsync();

        var result = await NewController(context).ReplaceSitePreferences(site.Id,
            new List<SitePreferenceRequest>
            {
                new() { VendorId = inactive.Id }
            },
            CancellationToken.None);

        result.Should().BeOfType<BadRequestObjectResult>();
        context.SitePreferredVendors.Should().BeEmpty();
    }

    [Fact]
    public async Task InsightsExports_ReturnStableCsvAndPdfFormats()
    {
        using var context = NewContext();
        var vendor = new Vendor { CompanyName = "=HYPERLINK(\"https://invalid.test\")", IsActive = false };
        var workOrder = new WorkOrder { DueDate = DateTime.UtcNow.AddHours(1), Trade = "Plumbing" };
        context.AddRange(vendor, workOrder);
        await context.SaveChangesAsync();
        context.Dispatches.Add(new Dispatch
        {
            VendorId = vendor.Id,
            WorkOrderId = workOrder.Id,
            Status = "Completed",
            DispatchedAt = DateTime.UtcNow.AddHours(-4),
            ScheduledDate = DateTime.UtcNow.AddHours(-2),
            AcknowledgedAt = DateTime.UtcNow.AddHours(-3),
            CompletedDate = DateTime.UtcNow
        });
        await context.SaveChangesAsync();
        var controller = NewController(context);

        var csv = (FileContentResult)await controller.ExportInsightsCsv(null, null, null, null, null, CancellationToken.None);
        var pdf = (FileContentResult)await controller.ExportInsightsPdf(null, null, null, null, null, CancellationToken.None);

        csv.ContentType.Should().Be("text/csv");
        var csvText = System.Text.Encoding.UTF8.GetString(csv.FileContents);
        csvText.Should().Contain("AverageCycleHours");
        csvText.Should().Contain("\"'=HYPERLINK(\"\"https://invalid.test\"\")\"");
        pdf.ContentType.Should().Be("application/pdf");
        System.Text.Encoding.ASCII.GetString(pdf.FileContents, 0, 8).Should().StartWith("%PDF-1.4");
    }

    [Fact]
    public async Task AssignVendor_RejectsInactiveVendor()
    {
        using var context = NewContext();
        var vendor = new Vendor { CompanyName = "Inactive", IsActive = false };
        var workOrder = new WorkOrder { WorkerOrderTitle = "Repair" };
        context.AddRange(vendor, workOrder);
        await context.SaveChangesAsync();

        var result = await NewController(context).AssignVendor(
            workOrder.Id,
            new VendorAssignmentRequest { VendorId = vendor.Id },
            CancellationToken.None);

        result.Should().BeOfType<BadRequestObjectResult>();
        context.Dispatches.Should().BeEmpty();
    }

    [Fact]
    public async Task AssignVendor_PersistsEtaAuditAndDisclosesConflicts()
    {
        using var context = NewContext();
        var start = DateTime.UtcNow.AddHours(2);
        var vendor = new Vendor
        {
            CompanyName = "Gateway",
            IsActive = true,
            AvailabilityStatus = "Available",
            AvailabilityUpdatedAt = DateTime.UtcNow
        };
        var existingWorkOrder = new WorkOrder
        {
            InternalWONumber = "WO-EXISTING",
            ScheduledStart = start,
            ScheduledEnd = start.AddHours(2)
        };
        var assignedWorkOrder = new WorkOrder
        {
            InternalWONumber = "WO-NEW",
            ScheduledStart = start.AddMinutes(30),
            ScheduledEnd = start.AddHours(1)
        };
        context.AddRange(vendor, existingWorkOrder, assignedWorkOrder);
        await context.SaveChangesAsync();
        context.Dispatches.Add(new Dispatch
        {
            VendorId = vendor.Id,
            WorkOrderId = existingWorkOrder.Id,
            Status = "Sent",
            ScheduledDate = existingWorkOrder.ScheduledStart
        });
        await context.SaveChangesAsync();
        var eta = start.AddMinutes(45);

        var result = await NewController(context).AssignVendor(
            assignedWorkOrder.Id,
            new VendorAssignmentRequest
            {
                VendorId = vendor.Id,
                ScheduledStart = assignedWorkOrder.ScheduledStart,
                ScheduledEnd = assignedWorkOrder.ScheduledEnd,
                EstimatedArrivalAt = eta,
                EtaManualOverride = true
            },
            CancellationToken.None);

        var value = ((OkObjectResult)result).Value!;
        Prop(value, "AvailabilityStatus").Should().Be("Unavailable");
        ((IEnumerable)Prop(value, "Conflicts")).Cast<object>().Should().ContainSingle();
        var dispatch = await context.Dispatches.SingleAsync(item =>
            item.WorkOrderId == assignedWorkOrder.Id);
        dispatch.EstimatedArrivalAt.Should().Be(eta);
        dispatch.EtaManualOverride.Should().BeTrue();
        dispatch.DispatchNumber.Should().StartWith("DISP-");
        context.WorkOrderAuditLogs.Should().ContainSingle(log =>
            log.WorkOrderId == assignedWorkOrder.Id && log.Action == "vendor_assigned");
    }

    [Fact]
    public async Task AssignVendor_ReusesDispatchLinkedThroughMultiWorkOrderJoin()
    {
        using var context = NewContext();
        var originalVendor = new Vendor { CompanyName = "Original", IsActive = true };
        var replacementVendor = new Vendor { CompanyName = "Replacement", IsActive = true };
        var workOrder = new WorkOrder
        {
            InternalWONumber = "WO-LINKED",
            ScheduledStart = DateTime.UtcNow.AddHours(2),
            ScheduledEnd = DateTime.UtcNow.AddHours(4)
        };
        context.AddRange(originalVendor, replacementVendor, workOrder);
        await context.SaveChangesAsync();
        var dispatch = new Dispatch
        {
            VendorId = originalVendor.Id,
            Status = "Sent",
            DispatchNumber = "DISP-LINKED"
        };
        context.Dispatches.Add(dispatch);
        await context.SaveChangesAsync();
        context.DispatchWorkOrders.Add(new DispatchWorkOrder
        {
            DispatchId = dispatch.Id,
            WorkOrderId = workOrder.Id
        });
        await context.SaveChangesAsync();

        var result = await NewController(context).AssignVendor(
            workOrder.Id,
            new VendorAssignmentRequest
            {
                VendorId = replacementVendor.Id,
                ScheduledStart = workOrder.ScheduledStart,
                ScheduledEnd = workOrder.ScheduledEnd
            },
            CancellationToken.None);

        result.Should().BeOfType<OkObjectResult>();
        context.Dispatches.Should().ContainSingle();
        (await context.Dispatches.SingleAsync()).VendorId.Should().Be(replacementVendor.Id);
    }
}