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 IProductDisplayService
{
    Task<Result<ProductDisplayModel>> Get(string slug, CancellationToken cancellationToken = default);
}

public sealed class ProductDisplayService(HttpClient httpClient) : IProductDisplayService
{
    public async Task<Result<ProductDisplayModel>> Get(string slug, CancellationToken cancellationToken = default)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(slug);

        using var response = await httpClient.GetAsync(
            $"/bff/catalog/products/{Uri.EscapeDataString(slug.Trim())}",
            cancellationToken);

        var payload = await response.Content.ReadFromJsonAsync<Result<ProductDisplayModel>>(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 problem = ResultProblem.Unexpected("Failed to retrieve product.", exception, statusCode);
        return Result<ProductDisplayModel>.Failure(problem);
    }
}