using System.Reflection;
using ErsatzTV.Application.Scheduling;
using ErsatzTV.Controllers.Api;
using ErsatzTV.Controllers.Api.Requests;
using ErsatzTV.Core;
using ErsatzTV.Core.Api.Scheduling;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Domain.Scheduling;
using LanguageExt;
using MediatR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Routing;
using NSubstitute;
using NUnit.Framework;
using Shouldly;
using static LanguageExt.Prelude;

namespace ErsatzTV.Tests.Controllers;

[TestFixture]
public class DecoControllerTests
{
    private DecoController _controller = null!;
    private IMediator _mediator = null!;

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

    [Test]
    public void Controller_Should_Expose_Idiomatic_Rest_Routes()
    {
        ShouldHaveActionRoute(nameof(DecoController.GetGroups), "GET", "/api/v1/decos/groups");
        ShouldHaveActionRoute(nameof(DecoController.CreateGroup), "POST", "/api/v1/decos/groups");
        ShouldHaveActionRoute(nameof(DecoController.DeleteGroup), "DELETE", "/api/v1/decos/groups/{id:int}");
        ShouldHaveActionRoute(nameof(DecoController.GetAll), "GET", "/api/v1/decos");
        ShouldHaveActionRoute(nameof(DecoController.GetById), "GET", "/api/v1/decos/{id:int}");
        ShouldHaveActionRoute(nameof(DecoController.Create), "POST", "/api/v1/decos");
        ShouldHaveActionRoute(nameof(DecoController.Delete), "DELETE", "/api/v1/decos/{id:int}");
        ShouldHaveActionRoute(nameof(DecoController.Replace), "PUT", "/api/v1/decos/{id:int}");
    }

    [Test]
    public async Task GetGroups_Should_Map_ViewModels()
    {
        _mediator.Send(Arg.Any<GetAllDecoGroups>(), Arg.Any<CancellationToken>())
            .Returns(new List<DecoGroupViewModel> { new(3, "Bumpers", 2) });

        List<DecoGroupResponseModel> result = await _controller.GetGroups(CancellationToken.None);

        result.Count.ShouldBe(1);
        result[0].Id.ShouldBe(3);
        result[0].Name.ShouldBe("Bumpers");
        result[0].DecoCount.ShouldBe(2);
    }

    [Test]
    public async Task CreateGroup_Should_Return_201_With_Location_And_Body()
    {
        _mediator.Send(Arg.Any<CreateDecoGroup>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, DecoGroupViewModel>(new DecoGroupViewModel(5, "Bumpers", 0)));

        IActionResult result = await _controller.CreateGroup(
            new CreateDecoGroupRequest("Bumpers"),
            CancellationToken.None);

        var created = result.ShouldBeOfType<CreatedResult>();
        created.Location.ShouldBe("/api/v1/decos/groups/5");
        created.Value.ShouldBeOfType<DecoGroupResponseModel>().Name.ShouldBe("Bumpers");
        await _mediator.Received(1).Send(
            Arg.Is<CreateDecoGroup>(c => c.Name == "Bumpers"),
            Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task CreateGroup_Should_Return_422_On_Validation_Error()
    {
        _mediator.Send(Arg.Any<CreateDecoGroup>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, DecoGroupViewModel>(BaseError.New("bad")));

        IActionResult result = await _controller.CreateGroup(
            new CreateDecoGroupRequest(string.Empty),
            CancellationToken.None);

        result.ShouldBeOfType<UnprocessableEntityObjectResult>();
    }

    [Test]
    public async Task DeleteGroup_Should_Return_204_When_Exists()
    {
        _mediator.Send(Arg.Any<GetAllDecoGroups>(), Arg.Any<CancellationToken>())
            .Returns(new List<DecoGroupViewModel> { new(3, "Bumpers", 0) });
        _mediator.Send(Arg.Any<DeleteDecoGroup>(), Arg.Any<CancellationToken>())
            .Returns(Option<BaseError>.None);

        IActionResult result = await _controller.DeleteGroup(3, CancellationToken.None);

        result.ShouldBeOfType<NoContentResult>();
        await _mediator.Received(1).Send(
            Arg.Is<DeleteDecoGroup>(c => c.DecoGroupId == 3),
            Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task DeleteGroup_Should_Return_404_When_Missing()
    {
        _mediator.Send(Arg.Any<GetAllDecoGroups>(), Arg.Any<CancellationToken>())
            .Returns(new List<DecoGroupViewModel>());

        IActionResult result = await _controller.DeleteGroup(99, CancellationToken.None);

        result.ShouldBeOfType<NotFoundObjectResult>();
        await _mediator.DidNotReceive().Send(Arg.Any<DeleteDecoGroup>(), Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task GetAll_Should_Flatten_Decos_Across_Groups()
    {
        _mediator.Send(Arg.Any<GetAllDecoGroups>(), Arg.Any<CancellationToken>())
            .Returns(new List<DecoGroupViewModel> { new(1, "A", 1), new(2, "B", 1) });
        _mediator.Send(Arg.Is<GetDecosByDecoGroupId>(q => q.DecoGroupId == 1), Arg.Any<CancellationToken>())
            .Returns(new List<DecoViewModel> { MakeDeco(10, 1, "First") });
        _mediator.Send(Arg.Is<GetDecosByDecoGroupId>(q => q.DecoGroupId == 2), Arg.Any<CancellationToken>())
            .Returns(new List<DecoViewModel> { MakeDeco(20, 2, "Second") });

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

        result.Count.ShouldBe(2);
        result[0].Id.ShouldBe(10);
        result[0].DecoGroupId.ShouldBe(1);
        result[1].Id.ShouldBe(20);
    }

    [Test]
    public async Task GetById_Should_Return_200_And_Map_All_Sections()
    {
        DecoViewModel deco = MakeDeco(
            4,
            2,
            "Movie Night",
            watermarkMode: DecoMode.Merge,
            breakContentMode: DecoMode.Override,
            breakContent:
            [
                new DecoBreakContentViewModel(
                    7,
                    CollectionType.Playlist,
                    null,
                    null,
                    null,
                    null,
                    new ErsatzTV.Application.MediaCollections.PlaylistViewModel(9, 3, "Idents", false, 1),
                    DecoBreakPlacement.BlockStart)
            ]);
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.Some(deco));

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

        var body = result.ShouldBeOfType<OkObjectResult>().Value.ShouldBeOfType<DecoResponseModel>();
        body.Id.ShouldBe(4);
        body.WatermarkMode.ShouldBe(DecoMode.Merge);
        body.BreakContentMode.ShouldBe(DecoMode.Override);
        body.BreakContent.Count.ShouldBe(1);
        body.BreakContent[0].PlaylistId.ShouldBe(9);
        body.BreakContent[0].PlaylistGroupId.ShouldBe(3);
        body.BreakContent[0].SelectionName.ShouldBe("Idents");
        body.BreakContent[0].Placement.ShouldBe(DecoBreakPlacement.BlockStart);
    }

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

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

        result.ShouldBeOfType<NotFoundObjectResult>();
    }

    [Test]
    public async Task Create_Should_Return_201_And_Map_Request()
    {
        _mediator.Send(Arg.Any<CreateDeco>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, DecoViewModel>(MakeDeco(8, 2, "Movie Night")));

        IActionResult result = await _controller.Create(
            new CreateDecoRequest(2, "Movie Night"),
            CancellationToken.None);

        var created = result.ShouldBeOfType<CreatedResult>();
        created.Location.ShouldBe("/api/v1/decos/8");
        await _mediator.Received(1).Send(
            Arg.Is<CreateDeco>(c => c.DecoGroupId == 2 && c.Name == "Movie Night"),
            Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task Create_Should_Return_422_On_Validation_Error()
    {
        _mediator.Send(Arg.Any<CreateDeco>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, DecoViewModel>(BaseError.New("Deco group does not exist")));

        IActionResult result = await _controller.Create(
            new CreateDecoRequest(99, "Movie Night"),
            CancellationToken.None);

        result.ShouldBeOfType<UnprocessableEntityObjectResult>();
    }

    [Test]
    public async Task Delete_Should_Return_204_When_Exists()
    {
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.Some(MakeDeco(4, 2, "Movie Night")));
        _mediator.Send(Arg.Any<DeleteDeco>(), Arg.Any<CancellationToken>())
            .Returns(Option<BaseError>.None);

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

        result.ShouldBeOfType<NoContentResult>();
    }

    [Test]
    public async Task Delete_Should_Return_404_When_Missing()
    {
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.None);

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

        result.ShouldBeOfType<NotFoundObjectResult>();
        await _mediator.DidNotReceive().Send(Arg.Any<DeleteDeco>(), Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task Replace_Should_Return_200_And_Send_Full_State_With_Current_GroupId()
    {
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.Some(MakeDeco(4, 7, "Movie Night")));
        _mediator.Send(Arg.Any<UpdateDeco>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, LanguageExt.Unit>(LanguageExt.Unit.Default));

        IActionResult result = await _controller.Replace(
            4,
            MakeReplaceRequest(
                "Movie Night",
                breakContentMode: DecoMode.Override,
                breakContent:
                [
                    new DecoBreakContentRequest(
                        0,
                        CollectionType.Playlist,
                        null,
                        null,
                        null,
                        null,
                        9,
                        DecoBreakPlacement.BlockStart)
                ]),
            CancellationToken.None);

        var body = result.ShouldBeOfType<OkObjectResult>().Value.ShouldBeOfType<DecoResponseModel>();
        body.Id.ShouldBe(4);
        await _mediator.Received(1).Send(
            Arg.Is<UpdateDeco>(c =>
                c.DecoId == 4 &&
                c.DecoGroupId == 7 &&
                c.Name == "Movie Night" &&
                c.BreakContentMode == DecoMode.Override &&
                c.BreakContent.Count == 1 &&
                c.BreakContent[0].PlaylistId == 9 &&
                c.BreakContent[0].Placement == DecoBreakPlacement.BlockStart),
            Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task Replace_Should_Return_404_When_Missing()
    {
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.None);

        IActionResult result = await _controller.Replace(
            4,
            MakeReplaceRequest("Movie Night"),
            CancellationToken.None);

        result.ShouldBeOfType<NotFoundObjectResult>();
        await _mediator.DidNotReceive().Send(Arg.Any<UpdateDeco>(), Arg.Any<CancellationToken>());
    }

    [Test]
    public async Task Replace_Should_Return_422_On_Handler_Validation_Error()
    {
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.Some(MakeDeco(4, 7, "Movie Night")));
        _mediator.Send(Arg.Any<UpdateDeco>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, LanguageExt.Unit>(BaseError.New("Deco may only contain one [Block Start] break content")));

        IActionResult result = await _controller.Replace(
            4,
            MakeReplaceRequest("Movie Night"),
            CancellationToken.None);

        result.ShouldBeOfType<UnprocessableEntityObjectResult>();
    }

    [Test]
    public async Task Replace_Should_Return_422_On_Merge_Mode_Mismatch_Without_Dispatch()
    {
        _mediator.Send(Arg.Any<GetDecoById>(), Arg.Any<CancellationToken>())
            .Returns(Option<DecoViewModel>.Some(MakeDeco(4, 7, "Movie Night")));

        IActionResult result = await _controller.Replace(
            4,
            MakeReplaceRequest("Movie Night", defaultFillerMode: DecoMode.Merge),
            CancellationToken.None);

        result.ShouldBeOfType<UnprocessableEntityObjectResult>();
        await _mediator.DidNotReceive().Send(Arg.Any<UpdateDeco>(), Arg.Any<CancellationToken>());
    }

    private static DecoViewModel MakeDeco(
        int id,
        int groupId,
        string name,
        DecoMode watermarkMode = DecoMode.Inherit,
        DecoMode breakContentMode = DecoMode.Inherit,
        List<DecoBreakContentViewModel>? breakContent = null) =>
        new(
            id,
            groupId,
            "Group",
            name,
            watermarkMode,
            [],
            false,
            DecoMode.Inherit,
            [],
            false,
            breakContentMode,
            breakContent ?? [],
            DecoMode.Inherit,
            CollectionType.Collection,
            null,
            null,
            null,
            null,
            false,
            DecoMode.Inherit,
            CollectionType.Collection,
            null,
            null,
            null,
            null);

    private static ReplaceDecoRequest MakeReplaceRequest(
        string name,
        DecoMode breakContentMode = DecoMode.Inherit,
        DecoMode defaultFillerMode = DecoMode.Inherit,
        List<DecoBreakContentRequest>? breakContent = null) =>
        new(
            name,
            DecoMode.Inherit,
            [],
            false,
            DecoMode.Inherit,
            [],
            false,
            breakContentMode,
            breakContent ?? [],
            defaultFillerMode,
            CollectionType.Collection,
            null,
            null,
            null,
            null,
            false,
            DecoMode.Inherit,
            CollectionType.Collection,
            null,
            null,
            null,
            null);

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

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