using System.Net;
using System.Net.Http.Json;
using Prefab.Web.Client.Models.Catalog;
using Prefab.Web.Client.Models.Shared;

namespace Prefab.Web.Client.Services;

public interface IProductListingService
{
    Task<Result<ProductListingModel>> GetCategoryProducts(string categorySlug, CancellationToken cancellationToken);
}

public sealed class ProductListingService(HttpClient httpClient) : IProductListingService
{
    public async Task<Result<ProductListingModel>> GetCategoryProducts(string categorySlug, CancellationToken cancellationToken)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(categorySlug);

        using var response = await httpClient.GetAsync(
            $"/bff/catalog/categories/{Uri.EscapeDataString(categorySlug)}" +
            "/models",
            cancellationToken);

        var payload = await response.Content.ReadFromJsonAsync<Result<ProductListingModel>>(cancellationToken: cancellationToken);

        if (payload is not null)
        {
            return payload;
        }

        var statusCode = (HttpStatusCode)response.StatusCode;
        var exception = new InvalidOperationException($"Response {(int)statusCode} did not contain a valid payload.");
        var unexpectedProblem = ResultProblem.Unexpected("Failed to retrieve category products.", exception, statusCode);

        return Result<ProductListingModel>.Failure(unexpectedProblem);
    }
}