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, string reference, CancellationToken ct = default)
    {
        using var response = await http.PostAsJsonAsync(
            new Uri(options.BaseUrl, "zaken"), new OpenZaakRequest(bsn, reference), 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);
    }

    public async Task ApproveZaakAsync(Uri zaakUrl, CancellationToken ct = default)
    {
        ArgumentNullException.ThrowIfNull(zaakUrl);

        using var response = await http.PostAsJsonAsync(
            new Uri(options.BaseUrl, "statussen"), new SetStatusRequest(zaakUrl.ToString()), ct);
        response.EnsureSuccessStatusCode();
    }

    public async Task CancelZaakAsync(Uri zaakUrl, CancellationToken ct = default)
    {
        ArgumentNullException.ThrowIfNull(zaakUrl);

        using var response = await http.PostAsJsonAsync(
            new Uri(options.BaseUrl, "annuleringen"), new CancelZaakRequest(zaakUrl.ToString()), ct);
        response.EnsureSuccessStatusCode();
    }

    public async Task<Uri> StoreDiplomaAsync(Uri zaakUrl, byte[] content, string fileName, string contentType, CancellationToken ct = default)
    {
        ArgumentNullException.ThrowIfNull(zaakUrl);
        ArgumentNullException.ThrowIfNull(content);

        // The file crosses this boundary base64-encoded in JSON — the domain and ACL contracts are
        // JSON, and a diploma is small (S-10b, ADR). The ACL turns it into a ZGW informatieobject.
        using var response = await http.PostAsJsonAsync(
            new Uri(options.BaseUrl, "documenten"),
            new StoreDocumentRequest(zaakUrl.ToString(), Convert.ToBase64String(content), fileName, contentType), ct);
        response.EnsureSuccessStatusCode();

        var stored = await response.Content.ReadFromJsonAsync<StoreDocumentResponse>(ct)
            ?? throw new InvalidOperationException("The ACL returned an empty document response.");
        return new Uri(stored.InformatieobjectUrl);
    }

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

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

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

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

    private sealed record StoreDocumentRequest(
        [property: JsonPropertyName("zaakUrl")] string ZaakUrl,
        [property: JsonPropertyName("contentBase64")] string ContentBase64,
        [property: JsonPropertyName("fileName")] string FileName,
        [property: JsonPropertyName("contentType")] string ContentType);

    private sealed record StoreDocumentResponse(
        [property: JsonPropertyName("informatieobjectUrl")] string InformatieobjectUrl);
}