using Api.SeaHavenIndustries.Controllers;
using Data.SeaHavenIndustries;
using FluentAssertions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using Moq;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Exceptions;
using SeaHaven.Services.Interfaces;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

public class VendorPortalControllerTests
{
    private static VendorPortalController NewController(Mock<IVendorPortalService> service, string? token = "valid-token")
    {
        var controller = new VendorPortalController(service.Object, Mock.Of<ILogger<VendorPortalController>>());
        var context = new DefaultHttpContext();
        if (token != null)
            context.Request.Headers["X-Vendor-Token"] = token;
        controller.ControllerContext = new ControllerContext { HttpContext = context };
        return controller;
    }

    private static readonly VendorPortalSession Session = new()
    {
        Id = 1,
        CompanyName = "Test Co",
        ContactName = "Sam",
        Email = "sam@test.co",
        Phone = "555-0100"
    };

    [Fact]
    public async Task Session_MissingToken_ReturnsUnauthorized()
    {
        var service = new Mock<IVendorPortalService>();
        var controller = NewController(service, token: null);

        var result = await controller.Session();

        result.Should().BeOfType<UnauthorizedObjectResult>();
    }

    [Fact]
    public async Task Session_InvalidToken_ReturnsUnauthorized()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync("bad", It.IsAny<CancellationToken>()))
            .ReturnsAsync((VendorPortalSession?)null);
        var controller = NewController(service, token: "bad");

        var result = await controller.Session();

        result.Should().BeOfType<UnauthorizedObjectResult>();
    }

    [Fact]
    public async Task Session_ValidToken_ReturnsSessionData()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync("valid-token", It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var controller = NewController(service);

        var result = await controller.Session();

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var envelope = ok.Value.Should().BeOfType<DataResponse>().Subject;
        envelope.Status.Should().Be("Success");
        var sessionData = envelope.Data as VendorPortalSession;
        sessionData.Should().Be(Session);
    }

    [Fact]
    public async Task ListDispatches_DelegatesToServiceWithStatus()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var dispatches = new[] { new VendorDispatchSummaryDTO { Id = 10, Status = "Sent" } };
        service.Setup(x => x.ListDispatchesAsync(Session, "Sent", It.IsAny<CancellationToken>()))
            .ReturnsAsync(dispatches);
        var controller = NewController(service);

        var result = await controller.ListDispatches("Sent");

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        service.Verify(x => x.ListDispatchesAsync(Session, "Sent", It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task GetDispatch_NotFound_Returns404()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.GetDispatchDetailAsync(Session, 99, It.IsAny<CancellationToken>()))
            .ReturnsAsync((VendorDispatchDetailDTO?)null);
        var controller = NewController(service);

        var result = await controller.GetDispatch(99);

        result.Should().BeOfType<NotFoundObjectResult>();
    }

    [Fact]
    public async Task Accept_KeyNotFound_Returns404()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.AcceptDispatchAsync(Session, 99, It.IsAny<CancellationToken>()))
            .ThrowsAsync(new KeyNotFoundException());
        var controller = NewController(service);

        var result = await controller.Accept(99);

        result.Should().BeOfType<NotFoundObjectResult>();
    }

    [Fact]
    public async Task Accept_InvalidOperation_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.AcceptDispatchAsync(Session, 10, It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Cannot accept"));
        var controller = NewController(service);

        var result = await controller.Accept(10);

        var bad = result.Should().BeOfType<BadRequestObjectResult>().Subject;
        var resp = bad.Value.Should().BeOfType<Response>().Subject;
        resp.Message.Should().NotContain("Cannot accept");
        resp.Message.Should().Contain("reference");
    }

    [Fact]
    public async Task Accept_Success_ReturnsAcknowledgedResult()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var acceptResult = new AcceptDispatchResultDTO { Id = 10, Status = "Acknowledged" };
        service.Setup(x => x.AcceptDispatchAsync(Session, 10, It.IsAny<CancellationToken>()))
            .ReturnsAsync(acceptResult);
        var controller = NewController(service);

        var result = await controller.Accept(10);

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var envelope = ok.Value.Should().BeOfType<DataResponse>().Subject;
        var acceptData = envelope.Data as AcceptDispatchResultDTO;
        acceptData.Should().Be(acceptResult);
    }

    [Fact]
    public async Task Refuse_KeyNotFound_Returns404()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.RefuseDispatchAsync(Session, 99, It.IsAny<string?>(), It.IsAny<CancellationToken>()))
            .ThrowsAsync(new KeyNotFoundException());
        var controller = NewController(service);

        var result = await controller.Refuse(99, new VendorPortalController.RefuseRequest { Reason = null });

        result.Should().BeOfType<NotFoundObjectResult>();
    }

    [Fact]
    public async Task Refuse_InvalidOperation_Returns400WithoutInternalDetail()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.RefuseDispatchAsync(Session, 10, "no", It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Cannot refuse a dispatch with status 'Acknowledged'"));
        var controller = NewController(service);

        var result = await controller.Refuse(10, new VendorPortalController.RefuseRequest { Reason = "no" });

        var bad = result.Should().BeOfType<BadRequestObjectResult>().Subject;
        var resp = bad.Value.Should().BeOfType<Response>().Subject;
        resp.Message.Should().NotContain("Cannot refuse");
        resp.Message.Should().Contain("reference");
    }

    [Fact]
    public async Task Refuse_Success_ReturnsRefusedResult()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var refusedAt = new DateTime(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);
        var refuseResult = new RefuseDispatchResultDTO { Id = 10, Status = "Refused", RefusedAt = refusedAt };
        service.Setup(x => x.RefuseDispatchAsync(Session, 10, "Too far", It.IsAny<CancellationToken>()))
            .ReturnsAsync(refuseResult);
        var controller = NewController(service);

        var result = await controller.Refuse(10, new VendorPortalController.RefuseRequest { Reason = "Too far" });

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var envelope = ok.Value.Should().BeOfType<DataResponse>().Subject;
        var data = envelope.Data as RefuseDispatchResultDTO;
        data.Should().Be(refuseResult);
        service.Verify(x => x.RefuseDispatchAsync(Session, 10, "Too far", It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public void RefuseEndpoint_AdvertisesDualCompatibilityRoutes()
    {
        var routes = typeof(VendorPortalController)
            .GetMethod(nameof(VendorPortalController.Refuse))!
            .GetCustomAttributes(typeof(HttpPostAttribute), inherit: false)
            .Cast<HttpPostAttribute>()
            .Select(attribute => attribute.Template);

        routes.Should().BeEquivalentTo("dispatches/{id:int}/refuse");
    }

    [Fact]
    public async Task ChangeStatus_ForbiddenTransition_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.ChangeStatusAsync(Session, 10, "Completed", It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Transition not allowed"));
        var controller = NewController(service);

        var result = await controller.ChangeStatus(10, new VendorPortalController.ChangeStatusRequest { Status = "Completed" });

        var bad = result.Should().BeOfType<BadRequestObjectResult>().Subject;
        var resp = bad.Value.Should().BeOfType<Response>().Subject;
        resp.Message.Should().NotContain("Transition");
        resp.Message.Should().Contain("reference");
    }

    [Fact]
    public async Task RequestCancel_Success_ReturnsSuccessWithMessage()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var controller = NewController(service);

        var result = await controller.RequestCancel(10, new VendorPortalController.RequestCancelRequest { Reason = "Parts delay" });

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var envelope = ok.Value.Should().BeOfType<DataResponse>().Subject;
        envelope.Status.Should().Be("Success");
        envelope.Message.Should().Be("Cancel request sent to dispatcher");
        service.Verify(x => x.RequestCancelAsync(Session, 10, "Parts delay", It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task UpdateChecklistItem_LockedDispatch_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.UpdateChecklistItemAsync(Session, 10, 5, true, It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Dispatch is locked"));
        var controller = NewController(service);

        var result = await controller.UpdateChecklistItem(10, 5, new VendorPortalController.ChecklistUpdateRequest { IsCompleted = true });

        result.Should().BeOfType<BadRequestObjectResult>();
    }

    [Fact]
    public async Task AddSignoff_DuplicateSignoff_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.AddSignoffAsync(Session, 10, "vendor", "Name", "sig", "drawn", It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("A vendor signoff already exists"));
        var controller = NewController(service);

        var result = await controller.AddSignoff(10, new VendorPortalController.SignoffRequest
        {
            SignoffType = "vendor",
            Name = "Name",
            Signature = "sig",
            SignatureMethod = "drawn"
        });

        result.Should().BeOfType<BadRequestObjectResult>();
    }

    [Fact]
    public async Task RequestUplift_NTEBelowCurrent_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.RequestUpliftAsync(Session, 10, 100m, null, It.IsAny<string?>(), It.IsAny<int?>(), It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Requested NTE must be greater than the current NTE"));
        var controller = NewController(service);

        var result = await controller.RequestUplift(10, new VendorPortalController.UpliftRequestBody { RequestedNTE = 100m });

        result.Should().BeOfType<BadRequestObjectResult>();
    }

    [Fact]
    public async Task RequestUplift_ConcurrentActiveRequest_ReturnsConflict()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.RequestUpliftAsync(
                Session,
                10,
                1500m,
                "Need more parts",
                It.IsAny<string?>(),
                It.IsAny<int?>(),
                It.IsAny<CancellationToken>()))
            .ThrowsAsync(new UpliftConflictException());
        var controller = NewController(service);

        var result = await controller.RequestUplift(10, new VendorPortalController.UpliftRequestBody
        {
            RequestedNTE = 1500m,
            Reason = "Need more parts",
        });

        var conflict = result.Should().BeOfType<ConflictObjectResult>().Subject;
        conflict.StatusCode.Should().Be(StatusCodes.Status409Conflict);
        conflict.Value.Should().NotBeNull();
    }

    [Fact]
    public async Task RequestUplift_Success_ReturnsResult()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var upliftResult = new UpliftRequestResultDTO { Id = 77, Status = "Pending", RequiredTier = 1 };
        service.Setup(x => x.RequestUpliftAsync(Session, 10, 500m, "Need more parts", It.IsAny<string?>(), It.IsAny<int?>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(upliftResult);
        var controller = NewController(service);

        var result = await controller.RequestUplift(10, new VendorPortalController.UpliftRequestBody
        {
            RequestedNTE = 500m,
            Reason = "Need more parts"
        });

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var envelope = ok.Value.Should().BeOfType<DataResponse>().Subject;
        var upliftData = envelope.Data as UpliftRequestResultDTO;
        upliftData.Should().Be(upliftResult);
    }

    [Fact]
    public async Task CancelUpliftRequest_NonPending_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.CancelUpliftRequestAsync(Session, 10, 77, It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Cannot cancel a 'Approved' uplift request"));
        var controller = NewController(service);

        var result = await controller.CancelUpliftRequest(10, 77);

        result.Should().BeOfType<BadRequestObjectResult>();
    }

    [Fact]
    public async Task CancelUpliftRequest_Success_ReturnsCancelledStatus()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        var cancelResult = new CancelUpliftResultDTO { Id = 77, Status = "Cancelled" };
        service.Setup(x => x.CancelUpliftRequestAsync(Session, 10, 77, It.IsAny<CancellationToken>()))
            .ReturnsAsync(cancelResult);
        var controller = NewController(service);

        var result = await controller.CancelUpliftRequest(10, 77);

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var envelope = ok.Value.Should().BeOfType<DataResponse>().Subject;
        var cancelData = envelope.Data as CancelUpliftResultDTO;
        cancelData.Should().Be(cancelResult);
    }

    [Fact]
    public async Task AddComment_EmptyText_Returns400()
    {
        var service = new Mock<IVendorPortalService>();
        service.Setup(x => x.ResolveSessionAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(Session);
        service.Setup(x => x.AddCommentAsync(Session, 10, "", It.IsAny<CancellationToken>()))
            .ThrowsAsync(new InvalidOperationException("Comment cannot be empty"));
        var controller = NewController(service);

        var result = await controller.AddComment(10, new VendorPortalController.CommentRequest { CommentText = "" });

        result.Should().BeOfType<BadRequestObjectResult>();
    }
}