using System.Net;
using System.Net.Http.Json;
using Prefab.Catalog.Domain.Exceptions;
using Prefab.Shared.Catalog.Products;
using Prefab.Tests.Infrastructure;
using Prefab.Web.Client.Models.Catalog;
using Prefab.Web.Client.Models.Shared;
using Shouldly;

namespace Prefab.Tests.Integration.Web.Gateway;

[Collection("Prefab.BffProduct")]
[Trait(TraitName.Category, TraitCategory.Integration)]
public sealed class ProductDetailGatewayShould(PrefabCompositeFixture_BffProduct fixture)
    : IClassFixture<PrefabCompositeFixture_BffProduct>
{
    [Fact]
    public async Task ReturnProductModelWhenFound()
    {
        fixture.UseProductClient(new SuccessProductClient(CreateSampleProductResponse()));

        var cancellationToken = TestContext.Current.CancellationToken;
        var client = fixture.CreateHttpClientForWeb();

        var response = await client.GetAsync("/bff/catalog/products/sample-widget", cancellationToken);
        response.StatusCode.ShouldBe(HttpStatusCode.OK);

        var payload = await response.Content.ReadFromJsonAsync<Result<ProductDisplayModel>>(cancellationToken: cancellationToken);
        payload.ShouldNotBeNull();
        payload!.IsSuccess.ShouldBeTrue(payload.Problem?.Detail);
        payload.Value.ShouldNotBeNull();
        payload.Value!.Slug.ShouldBe("sample-widget");
        payload.Value.Name.ShouldBe("Sample Widget");
        payload.Value.Sku.ShouldBe("SW-001");
        payload.Value.Categories.ShouldNotBeEmpty();
    }

    [Fact]
    public async Task ReturnNotFoundWhenMissing()
    {
        fixture.UseProductClient(new NotFoundProductClient());

        var cancellationToken = TestContext.Current.CancellationToken;
        var client = fixture.CreateHttpClientForWeb();

        var response = await client.GetAsync("/bff/catalog/products/missing-widget", cancellationToken);
        response.StatusCode.ShouldBe(HttpStatusCode.NotFound);

        var payload = await response.Content.ReadFromJsonAsync<Result<ProductDisplayModel>>(cancellationToken: cancellationToken);
        payload.ShouldNotBeNull();
        payload!.IsSuccess.ShouldBeFalse();
        payload.Problem.ShouldNotBeNull();
        payload.Problem!.StatusCode.ShouldBe((int)HttpStatusCode.NotFound);
    }

    private static GetProductDetail.Response CreateSampleProductResponse()
    {
        var optionValues = new[]
        {
            new GetProductDetail.OptionValueDto(Guid.NewGuid(), "red", "Red", 0m, (int)GetProductDetail.PriceDeltaKind.Absolute, null),
            new GetProductDetail.OptionValueDto(Guid.NewGuid(), "blue", "Blue", 0m, (int)GetProductDetail.PriceDeltaKind.Absolute, null)
        };

        var optionDefinitions = new[]
        {
            new GetProductDetail.OptionDefinitionDto(
                Guid.NewGuid(),
                "color",
                "Color",
                (int)GetProductDetail.OptionDataType.Choice,
                true,
                Unit: null,
                Min: null,
                Max: null,
                Step: null,
                PricePerUnit: null,
                Tiers: Array.Empty<GetProductDetail.OptionTierDto>(),
                Values: optionValues,
                Rules: null)
        };

        var specs = new[]
        {
            new GetProductDetail.SpecDto("Weight", "25 lb", null, null)
        };

        var attributes = new Dictionary<string, string>
        {
            ["catalog.product.docs"] = """[{ "title": "Spec Sheet", "url": "https://example.com/spec.pdf" }]"""
        };

        var categories = new[]
        {
            new GetProductDetail.CategoryDto(Guid.NewGuid(), "Lighting", "lighting")
        };

        var product = new GetProductDetail.ProductDetailDto(
            Guid.NewGuid(),
            "Sample Widget",
            "sample-widget",
            "Sample description.",
            42.50m,
            "SW-001",
            categories,
            optionDefinitions,
            specs,
            attributes);

        return new GetProductDetail.Response(product);
    }

    private sealed class SuccessProductClient(GetProductDetail.Response response) : IProductClient
    {
        public Task<GetCategoryModels.Response> GetCategoryModels(
            string slug,
            int? page,
            int? pageSize,
            string? sort,
            string? direction,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category models are not required for this test.");

        public Task<GetCategory.Response> GetCategory(string slug, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category client is not required for this test.");

        public Task<GetCategoryTree.Response> GetCategoryTree(int? depth, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category tree is not required for this test.");

        public Task<GetProductDetail.Response> GetProductDetail(string slug, CancellationToken cancellationToken) =>
            Task.FromResult(response);

        public Task<QuotePrice.Response> Quote(QuotePrice.Request request, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Price quotes are not required for this test.");

        public Task<QuotePrice.Response> QuotePrice(QuotePrice.Request request, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Price quotes are not required for this test.");
    }

    private sealed class NotFoundProductClient : IProductClient
    {
        public Task<GetCategoryModels.Response> GetCategoryModels(
            string slug,
            int? page,
            int? pageSize,
            string? sort,
            string? direction,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category models are not required for this test.");

        public Task<GetCategory.Response> GetCategory(string slug, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category client is not required for this test.");

        public Task<GetCategoryTree.Response> GetCategoryTree(int? depth, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Category tree is not required for this test.");

        public Task<GetProductDetail.Response> GetProductDetail(string slug, CancellationToken cancellationToken) =>
            throw new CatalogNotFoundException("Product", slug);

        public Task<QuotePrice.Response> Quote(QuotePrice.Request request, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Price quotes are not required for this test.");

        public Task<QuotePrice.Response> QuotePrice(QuotePrice.Request request, CancellationToken cancellationToken) =>
            throw new NotSupportedException("Price quotes are not required for this test.");
    }
}