using Data.SeaHavenIndustries;
using FluentAssertions;
using Microsoft.Extensions.Options;
using Moq;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.DataServices.Models;
using SeaHaven.Services.Configuration;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Interfaces;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

public class DispatchBatchingBehaviorTests
{
    private static WorkOrderDispatchService BuildService(
        Mock<IWorkOrderDataService>? woData = null,
        Mock<IVendorDataService>? vendorData = null,
        Mock<ITaskListTemplateDataService>? templateData = null,
        Mock<IDispatchDataService>? dispatchData = null)
    {
        var dd = dispatchData ?? new Mock<IDispatchDataService>();
        dd.Setup(d => d.GenerateNextPONumberAsync()).ReturnsAsync("1");
        dd.Setup(d => d.GenerateNextDispatchNumberAsync()).ReturnsAsync("DSP-1");
        dd.Setup(d => d.AddAsync(It.IsAny<Dispatch>()))
            .ReturnsAsync((Dispatch d) => d);

        var emailPort = new Mock<IDispatchEmailPort>();
        emailPort.Setup(e => e.SendDispatchEmailAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()))
            .ReturnsAsync(true);

        var tokenPort = new Mock<IVendorTokenPort>();
        tokenPort.Setup(t => t.GetOrCreateActiveTokenAsync(It.IsAny<int>())).ReturnsAsync("token");

        return new WorkOrderDispatchService(
            (woData ?? new Mock<IWorkOrderDataService>()).Object,
            dd.Object,
            (vendorData ?? new Mock<IVendorDataService>()).Object,
            Mock.Of<IUserDataService>(),
            (templateData ?? new Mock<ITaskListTemplateDataService>()).Object,
            Mock.Of<ICommentDataService>(),
            emailPort.Object,
            tokenPort.Object,
            Microsoft.Extensions.Options.Options.Create(new FrontendOptions()));
    }

    private static Mock<IWorkOrderDataService> WorkOrderDataReturning(params WorkOrder[] workOrders) =>
        WorkOrderDataReturning(new Mock<IWorkOrderDataService>(), workOrders);

    private static Mock<IWorkOrderDataService> WorkOrderDataReturning(Mock<IWorkOrderDataService> mock, params WorkOrder[] workOrders)
    {
        mock.Setup(d => d.GetByRequestedIdsWithDetailsAsync(
                It.IsAny<IReadOnlyCollection<int>>(),
                It.IsAny<CancellationToken>()))
            .ReturnsAsync(workOrders.ToList());
        return mock;
    }

    private static Mock<IVendorDataService> VendorDataReturning(params Vendor[] vendors)
    {
        var mock = new Mock<IVendorDataService>();
        mock.Setup(d => d.GetByIdsOrderedAsync(It.IsAny<IReadOnlyCollection<int>>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(vendors.ToList());
        return mock;
    }

    [Fact]
    public async Task Dispatch_PrimaryWorkOrderFollowsReturnedOrder()
    {
        var woData = WorkOrderDataReturning(
            new WorkOrder { Id = 30, InternalWONumber = "WO-30" },
            new WorkOrder { Id = 10, InternalWONumber = "WO-10" });
        var dispatchData = new Mock<IDispatchDataService>();
        var service = BuildService(woData, VendorDataReturning(new Vendor { Id = 1, CompanyName = "V", Email = "v@x.io" }), dispatchData: dispatchData);

        Dispatch? saved = null;
        dispatchData.Setup(d => d.AddAsync(It.IsAny<Dispatch>()))
            .ReturnsAsync((Dispatch d) => { saved = d; return d; });

        await service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 30, 10 },
            VendorIds = new() { 1 }
        }, CancellationToken.None);

        saved.Should().NotBeNull();
        saved!.WorkOrderId.Should().Be(30);
    }

    [Fact]
    public async Task Dispatch_DeduplicatesVendorsAndSkipsMissing()
    {
        var woData = WorkOrderDataReturning(new WorkOrder { Id = 10, InternalWONumber = "WO-10" });
        var vendorData = new Mock<IVendorDataService>();
        vendorData.Setup(d => d.GetByIdsOrderedAsync(It.IsAny<IReadOnlyCollection<int>>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<Vendor> { new() { Id = 2, CompanyName = "Only Co", Email = "v@x.io" } });

        var service = BuildService(woData, vendorData);

        var result = await service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 10 },
            VendorIds = new() { 2, 2, 999 }
        }, CancellationToken.None);

        result.Dispatches.Should().HaveCount(1);
        result.Dispatches.Single().VendorName.Should().Be("Only Co");
        vendorData.Verify(d => d.GetByIdsOrderedAsync(
            It.Is<IReadOnlyCollection<int>>(ids => ids.SequenceEqual(new[] { 2, 999 })),
            It.IsAny<CancellationToken>()), Times.Once);
        vendorData.Verify(d => d.GetByIdAsync(It.IsAny<int>()), Times.Never);
    }

    [Fact]
    public async Task Dispatch_FetchesTemplateOnceRegardlessOfVendorCount()
    {
        var woData = WorkOrderDataReturning(new WorkOrder { Id = 10, InternalWONumber = "WO-10" });
        var templateData = new Mock<ITaskListTemplateDataService>();
        templateData.Setup(d => d.GetByIdWithItemsAsync(7))
            .ReturnsAsync(new TaskListTemplate
            {
                Items = new List<TaskListTemplateItem>
                {
                    new() { ItemText = "A", SortOrder = 0 },
                    new() { ItemText = "B", SortOrder = 1 }
                }
            });
        var vendorData = VendorDataReturning(
            new Vendor { Id = 1, CompanyName = "V1", Email = "a@x.io" },
            new Vendor { Id = 2, CompanyName = "V2", Email = "b@x.io" });

        var service = BuildService(woData, vendorData, templateData);

        await service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 10 },
            VendorIds = new() { 1, 2 },
            TaskListTemplateId = 7
        }, CancellationToken.None);

        templateData.Verify(d => d.GetByIdWithItemsAsync(7), Times.Once);
    }

    [Fact]
    public async Task Dispatch_PerformsSingleBatchedVendorLookup()
    {
        var woData = WorkOrderDataReturning(new WorkOrder { Id = 10, InternalWONumber = "WO-10" });
        var vendorData = VendorDataReturning(new Vendor { Id = 1, CompanyName = "V1", Email = "a@x.io" });

        var service = BuildService(woData, vendorData);

        await service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 10 },
            VendorIds = new() { 1, 2, 3 }
        }, CancellationToken.None);

        vendorData.Verify(d => d.GetByIdsOrderedAsync(It.IsAny<IReadOnlyCollection<int>>(), It.IsAny<CancellationToken>()), Times.Once);
        vendorData.Verify(d => d.GetByIdAsync(It.IsAny<int>()), Times.Never);
    }

    [Fact]
    public async Task Dispatch_BatchesAuditLogsOncePerVendorAndNeverSingles()
    {
        var woData = WorkOrderDataReturning(
            new WorkOrder { Id = 10, InternalWONumber = "WO-10" },
            new WorkOrder { Id = 11, InternalWONumber = "WO-11" });
        var vendorData = VendorDataReturning(
            new Vendor { Id = 1, CompanyName = "V1", Email = "a@x.io" },
            new Vendor { Id = 2, CompanyName = "V2", Email = "b@x.io" });

        var service = BuildService(woData, vendorData);

        await service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 10, 11 },
            VendorIds = new() { 1, 2 }
        }, CancellationToken.None);

        woData.Verify(d => d.AddAuditLogsAsync(It.Is<IReadOnlyCollection<WorkOrderAuditLog>>(logs => logs.Count == 2)), Times.Exactly(2));
        woData.Verify(d => d.AddAuditLogAsync(It.IsAny<WorkOrderAuditLog>()), Times.Never);
    }

    [Fact]
    public async Task Dispatch_NoWorkOrders_Throws()
    {
        var woData = WorkOrderDataReturning();
        var service = BuildService(woData, VendorDataReturning());

        var act = () => service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 404 },
            VendorIds = new() { 1 }
        }, CancellationToken.None);

        await act.Should().ThrowAsync<InvalidOperationException>();
    }

    [Fact]
    public async Task Dispatch_ForwardsSameCancellationTokenToBothBatchDataServices()
    {
        var woData = WorkOrderDataReturning(new WorkOrder { Id = 10, InternalWONumber = "WO-10" });
        var vendorData = VendorDataReturning(new Vendor { Id = 1, CompanyName = "V1", Email = "a@x.io" });
        var service = BuildService(woData, vendorData);

        using var cts = new CancellationTokenSource();
        var token = cts.Token;

        await service.DispatchToVendorAsync(new DispatchToVendorInput
        {
            WorkOrderIds = new() { 10 },
            VendorIds = new() { 1 }
        }, token);

        woData.Verify(d => d.GetByRequestedIdsWithDetailsAsync(
            It.IsAny<IReadOnlyCollection<int>>(),
            token), Times.Once);
        vendorData.Verify(d => d.GetByIdsOrderedAsync(
            It.IsAny<IReadOnlyCollection<int>>(),
            token), Times.Once);
    }
}