using FluentValidation;
using Moq;
using Prefab.Shared.Catalog;
using Prefab.Shared.Catalog.Products;
using Prefab.Tests;
using Prefab.Web.Client.Models.Catalog;
using Prefab.Web.Client.Models.Home;
using Prefab.Web.Client.Models.Shared;
using Prefab.Web.Gateway;
using Shouldly;
using UrlPolicy = Prefab.Web.UrlPolicy.UrlPolicy;

namespace Prefab.Tests.Unit.Web.Gateway;

[Trait(TraitName.Category, TraitCategory.Unit)]
public sealed class HomeServiceShould
{
    [Fact]
    public async Task AggregateFeaturedProductsAndCategories()
    {
        var (service, productClient) = CreateService();

        var featured = CreateNode("Featured Leaf", "featured-leaf", displayOrder: 2, isFeatured: true);
        var secondary = CreateNode("Secondary Leaf", "secondary-leaf", displayOrder: 1, isFeatured: false);

        productClient
            .Setup(client => client.GetCategoryTree(3, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new GetCategoryTree.Response(new[] { featured, secondary }));

        productClient
            .Setup(client => client.GetCategoryModels("featured-leaf", It.IsAny<int?>(), It.IsAny<int?>(), It.IsAny<string?>(), It.IsAny<string?>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateListingResponse("featured-leaf", total: 3, cards: new[]
            {
                CreateProductCardDto("Featured 1", "featured-1", 19m),
                CreateProductCardDto("Duplicate", "duplicate", 21m)
            }));

        productClient
            .Setup(client => client.GetCategoryModels("secondary-leaf", It.IsAny<int?>(), It.IsAny<int?>(), It.IsAny<string?>(), It.IsAny<string?>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateListingResponse("secondary-leaf", total: 2, cards: new[]
            {
                CreateProductCardDto("Secondary 1", "secondary-1", 15m),
                CreateProductCardDto("Duplicate", "duplicate", 21m)
            }));

        var result = await service.Get(CancellationToken.None);

        result.IsSuccess.ShouldBeTrue();
        var payload = result.Value.ShouldNotBeNull();

        payload.LatestCategories.Count.ShouldBe(2);
        payload.LatestCategories.Select(category => category.Title).ShouldBe(["Featured Leaf", "Secondary Leaf"]);

        payload.FeaturedProducts.Count.ShouldBe(3);
        payload.FeaturedProducts.Select(product => product.Url).ShouldBe([
            UrlPolicy.BrowseProduct("featured-1"),
            UrlPolicy.BrowseProduct("duplicate"),
            UrlPolicy.BrowseProduct("secondary-1")
        ]);
    }

    [Fact]
    public async Task SkipCategoriesWithoutProducts()
    {
        var (service, productClient) = CreateService();

        var empty = CreateNode("Empty Leaf", "empty-leaf", displayOrder: 0, isFeatured: true);
        var populated = CreateNode("Populated Leaf", "populated-leaf", displayOrder: 1, isFeatured: false);

        productClient
            .Setup(client => client.GetCategoryTree(3, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new GetCategoryTree.Response(new[] { empty, populated }));

        productClient
            .Setup(client => client.GetCategoryModels("empty-leaf", It.IsAny<int?>(), It.IsAny<int?>(), It.IsAny<string?>(), It.IsAny<string?>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateListingResponse("empty-leaf", total: 0, cards: Array.Empty<GetCategoryModels.ProductCardDto>()));

        productClient
            .Setup(client => client.GetCategoryModels("populated-leaf", It.IsAny<int?>(), It.IsAny<int?>(), It.IsAny<string?>(), It.IsAny<string?>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(CreateListingResponse("populated-leaf", total: 1, cards: new[]
            {
                CreateProductCardDto("Populated", "populated-1", 32m)
            }));

        var result = await service.Get(CancellationToken.None);

        result.IsSuccess.ShouldBeTrue();
        var payload = result.Value.ShouldNotBeNull();

        payload.LatestCategories.Count.ShouldBe(1);
        payload.LatestCategories.Single().Title.ShouldBe("Populated Leaf");
        payload.FeaturedProducts.Single().Url.ShouldBe(UrlPolicy.BrowseProduct("populated-1"));
    }

    private static (Home.Service Service, Mock<IProductClient> ProductClient) CreateService()
    {
        var moduleClient = new Mock<IModuleClient>();
        var productClient = new Mock<IProductClient>();
        moduleClient.SetupGet(client => client.Product).Returns(productClient.Object);

        var listingService = new Products.ListingService(moduleClient.Object);
        var service = new Home.Service(moduleClient.Object, listingService);

        return (service, productClient);
    }

    private static GetCategoryModels.CategoryNodeDto CreateNode(string name, string slug, int displayOrder, bool isFeatured) =>
        new(
            Guid.NewGuid(),
            name,
            slug,
            Description: null,
            HeroImageUrl: null,
            Icon: null,
            DisplayOrder: displayOrder,
            IsFeatured: isFeatured,
            IsLeaf: true,
            Children: Array.Empty<GetCategoryModels.CategoryNodeDto>());

    private static GetCategoryModels.Response CreateListingResponse(
        string slug,
        int total,
        IReadOnlyList<GetCategoryModels.ProductCardDto> cards)
    {
        var category = new GetCategoryModels.CategoryDetailDto(
            Guid.NewGuid(),
            slug,
            slug,
            Description: null,
            HeroImageUrl: null,
            Icon: null,
            IsLeaf: true,
            Children: Array.Empty<GetCategoryModels.CategoryNodeDto>());

        var response = new GetCategoryModels.CategoryProductsResponse(
            category,
            cards,
            total,
            Page: 1,
            PageSize: Math.Max(1, cards.Count));

        return new GetCategoryModels.Response(response);
    }

    private static GetCategoryModels.ProductCardDto CreateProductCardDto(string name, string slug, decimal price) =>
        new(
            Guid.NewGuid(),
            name,
            slug,
            FromPrice: price,
            PrimaryImageUrl: null,
            LastModifiedOn: DateTimeOffset.UtcNow);
}