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

namespace EnvelopeGenerator.Server.Client.Services;

public class ReceiverService(IHttpClientFactory httpClientFactory)
{
    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);

    /// <summary>
    /// Fetches receiver email suggestions from sender-authorized API.
    /// Calls GET /api/Receiver?EmailAddressSearch={term}&onlyEmailAddress=true.
    /// </summary>
    public async Task<IReadOnlyList<string>> SearchReceiverEmailsAsync(string searchTerm, CancellationToken cancel = default)
    {
        if (string.IsNullOrWhiteSpace(searchTerm))
            return [];

        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var url = $"/api/Receiver?EmailAddressSearch={Uri.EscapeDataString(searchTerm)}&onlyEmailAddress=true";
        var response = await http.GetAsync(url, cancel);

        if (!response.IsSuccessStatusCode)
            return [];

        var emails = await response.Content.ReadFromJsonAsync<List<string>>(JsonOptions, cancel);
        return emails ?? [];
    }
}