using System.Net;
using System.Net.Http.Json;

namespace EnvelopeGenerator.Server.Client.Services;

public class PdfSignatureService(IHttpClientFactory httpClientFactory)
{
    /// <summary>
    /// Calls POST /api/PdfSignature with the envelope id and returns the fully signed PDF bytes.
    /// </summary>
    public async Task<byte[]> GetSignedPdfAsync(int envelopeId, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var response = await http.PostAsJsonAsync("/api/PdfSignature", new { Id = envelopeId }, cancel);

        if (!response.IsSuccessStatusCode)
            throw new HttpRequestException(
                $"Failed to load signed PDF. Status: {(int)response.StatusCode} ({response.ReasonPhrase ?? "Unknown"})",
                null,
                response.StatusCode);

        return await response.Content.ReadAsByteArrayAsync(cancel);
    }
}