using System.Net.Http.Json;
using System.Text.Json.Serialization;
using Big.Application;

namespace Big.Infrastructure;

/// <summary>
/// HTTP client to the ACL service — the boundary the domain crosses to open a zaak (§8.1). It POSTs
/// the bsn to the ACL's <c>/zaken</c> endpoint and returns the created zaak URL; it never constructs
/// ZGW URLs or talks to OpenZaak itself.
/// </summary>
public sealed class AclHttpClient(HttpClient http, AclOptions options) : IAclClient
{
    public async Task<Uri> OpenZaakAsync(string bsn, CancellationToken ct = default)
    {
        using var response = await http.PostAsJsonAsync(
            new Uri(options.BaseUrl, "zaken"), new OpenZaakRequest(bsn), ct);
        response.EnsureSuccessStatusCode();

        var opened = await response.Content.ReadFromJsonAsync<OpenZaakResponse>(ct)
            ?? throw new InvalidOperationException("The ACL returned an empty zaak response.");
        return new Uri(opened.ZaakUrl);
    }

    private sealed record OpenZaakRequest([property: JsonPropertyName("bsn")] string Bsn);

    private sealed record OpenZaakResponse([property: JsonPropertyName("zaakUrl")] string ZaakUrl);
}