using System.Reflection;
using ErsatzTV.Application.MediaCollections;
using ErsatzTV.Controllers.Api;
using ErsatzTV.Controllers.Api.Requests;
using ErsatzTV.Core;
using ErsatzTV.Core.Api.SmartCollections;
using ErsatzTV.Core.Errors;
using LanguageExt;
using MediatR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Routing;
using NSubstitute;
using NUnit.Framework;
using Shouldly;
using static LanguageExt.Prelude;
using Unit = LanguageExt.Unit;

namespace ErsatzTV.Tests.Controllers;

[TestFixture]
public class SmartCollectionControllerTests
{
    private SmartCollectionController _controller = null!;
    private IMediator _mediator = null!;

    [SetUp]
    public void SetUp()
    {
        _mediator = Substitute.For<IMediator>();
        _controller = new SmartCollectionController(_mediator);
    }

    [Test]
    public void Controller_Should_Expose_Idiomatic_Rest_Routes()
    {
        ShouldHaveActionRoute(nameof(SmartCollectionController.GetAll), "GET", "/api/smart-collections");
        ShouldHaveActionRoute(nameof(SmartCollectionController.GetById), "GET", "/api/smart-collections/{id:int}");
        ShouldHaveActionRoute(nameof(SmartCollectionController.Create), "POST", "/api/smart-collections");
        ShouldHaveActionRoute(nameof(SmartCollectionController.Update), "PUT", "/api/smart-collections/{id:int}");
        ShouldHaveActionRoute(nameof(SmartCollectionController.Delete), "DELETE", "/api/smart-collections/{id:int}");
    }

    [Test]
    public async Task Create_Should_Return_201_With_Location_And_Body()
    {
        var vm = new SmartCollectionViewModel(7, "Kids", "tag:family");
        _mediator.Send(Arg.Any<CreateSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, SmartCollectionViewModel>(vm));

        IActionResult result = await _controller.Create(
            new CreateSmartCollectionRequest("Kids", "tag:family"),
            CancellationToken.None);

        var created = result.ShouldBeOfType<CreatedResult>();
        created.StatusCode.ShouldBe(201);
        created.Location.ShouldBe("/api/smart-collections/7");
        created.Value.ShouldBe(vm);
    }

    [Test]
    public async Task Create_Should_Return_422_On_Validation_Error()
    {
        _mediator.Send(Arg.Any<CreateSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, SmartCollectionViewModel>(BaseError.New("bad")));

        IActionResult result = await _controller.Create(
            new CreateSmartCollectionRequest(string.Empty, string.Empty),
            CancellationToken.None);

        result.ShouldBeOfType<UnprocessableEntityObjectResult>();
    }

    [Test]
    public async Task Create_Should_Map_Request_To_Command()
    {
        _mediator.Send(Arg.Any<CreateSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, SmartCollectionViewModel>(
                new SmartCollectionViewModel(7, "Kids", "tag:family")));

        await _controller.Create(new CreateSmartCollectionRequest("Kids", "tag:family"), CancellationToken.None);

        await _mediator.Received(1).Send(
            Arg.Is<CreateSmartCollection>(c => c.Name == "Kids" && c.Query == "tag:family"),
            Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task Update_Should_Return_200_And_Map_Route_Id()
    {
        _mediator.Send(Arg.Any<UpdateSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, UpdateSmartCollectionResult>(new UpdateSmartCollectionResult(8)));
        var vm = new SmartCollectionViewModel(8, "Updated", "tag:updated");
        _mediator.Send(Arg.Any<GetSmartCollectionById>(), Arg.Any<CancellationToken>())
            .Returns(Option<SmartCollectionViewModel>.Some(vm));

        IActionResult result = await _controller.Update(
            8,
            new UpdateSmartCollectionRequest("Updated", "tag:updated"),
            CancellationToken.None);

        result.ShouldBeOfType<OkObjectResult>().Value.ShouldBe(vm);
        await _mediator.Received(1).Send(
            Arg.Is<UpdateSmartCollection>(c =>
                c.Id == 8 && c.Name == "Updated" && c.Query == "tag:updated"),
            Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task Update_Should_Return_404_For_NotFoundError()
    {
        _mediator.Send(Arg.Any<UpdateSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, UpdateSmartCollectionResult>(new NotFoundError("missing")));

        IActionResult result = await _controller.Update(
            99,
            new UpdateSmartCollectionRequest("Missing", "tag:missing"),
            CancellationToken.None);

        result.ShouldBeOfType<NotFoundObjectResult>();
    }

    [Test]
    public async Task Delete_Should_Return_204_On_Success()
    {
        _mediator.Send(Arg.Any<DeleteSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, Unit>(Unit.Default));

        IActionResult result = await _controller.Delete(9, CancellationToken.None);

        result.ShouldBeOfType<NoContentResult>();
    }

    [Test]
    public async Task Delete_Should_Return_404_For_NotFoundError()
    {
        _mediator.Send(Arg.Any<DeleteSmartCollection>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, Unit>(new NotFoundError("missing")));

        IActionResult result = await _controller.Delete(9, CancellationToken.None);

        result.ShouldBeOfType<NotFoundObjectResult>();
    }

    [Test]
    public async Task GetAll_Should_Return_SmartCollections()
    {
        List<SmartCollectionResponseModel> vms =
        [
            new SmartCollectionResponseModel(1, "Kids", "tag:kids"),
            new SmartCollectionResponseModel(2, "News", "tag:news")
        ];
        _mediator.Send(Arg.Any<GetAllSmartCollectionsForApi>(), Arg.Any<CancellationToken>())
            .Returns(vms);

        List<SmartCollectionResponseModel> result = await _controller.GetAll(CancellationToken.None);

        result.ShouldBe(vms);
    }

    [Test]
    public async Task GetById_Should_Return_200_For_Some()
    {
        var vm = new SmartCollectionViewModel(4, "Kids", "tag:kids");
        _mediator.Send(Arg.Any<GetSmartCollectionById>(), Arg.Any<CancellationToken>())
            .Returns(Option<SmartCollectionViewModel>.Some(vm));

        IActionResult result = await _controller.GetById(4, CancellationToken.None);

        result.ShouldBeOfType<OkObjectResult>().Value.ShouldBe(vm);
    }

    [Test]
    public async Task GetById_Should_Return_404_For_None()
    {
        _mediator.Send(Arg.Any<GetSmartCollectionById>(), Arg.Any<CancellationToken>())
            .Returns(Option<SmartCollectionViewModel>.None);

        IActionResult result = await _controller.GetById(4, CancellationToken.None);

        var notFound = result.ShouldBeOfType<NotFoundObjectResult>();
        var problemDetails = notFound.Value.ShouldBeOfType<ProblemDetails>();
        problemDetails.Status.ShouldBe(404);
        problemDetails.Title.ShouldBe("Resource not found");
    }

    private static void ShouldHaveActionRoute(string actionName, string httpMethod, string route)
    {
        MethodInfo action = typeof(SmartCollectionController).GetMethod(actionName)
            ?? throw new AssertionException($"Missing action {actionName}");

        HttpMethodAttribute attribute = action.GetCustomAttributes<HttpMethodAttribute>(inherit: true).Single();
        attribute.HttpMethods.ShouldContain(httpMethod);
        attribute.Template.ShouldBe(route);
    }
}