using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Server.Client.Models;

namespace EnvelopeGenerator.Server.Client.Services;

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

    public async Task<IReadOnlyList<SignatureDto>> GetAsync(string envelopeKey, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
        var url = $"/api/Signature/{Uri.EscapeDataString(envelopeKey)}";
        var response = await http.GetAsync(url, cancel);

        if (!response.IsSuccessStatusCode)
            throw new HttpRequestException($"Failed to retrieve signatures for envelope {envelopeKey}: {response.StatusCode} {response.ReasonPhrase}");

        var result = await response.Content.ReadFromJsonAsync<List<SignatureDto>>(_jsonOptions, cancel);
        return result ?? [];
    }

    public async Task SubmitAsync(string envelopeKey, IEnumerable<SignatureSubmitDto> signatures, CancellationToken cancel = default)
    {
        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");

        var payload = signatures
            .Select(signature => new Signature
            {
                Id = signature.Id,
                DataUrl = signature.DataUrl,
                FullName = signature.FullName,
                Position = signature.Position,
                Place = signature.Place
            })
            .ToList();

        var response = await http.PostAsJsonAsync(
            $"/api/Signature/submit/{Uri.EscapeDataString(envelopeKey)}",
            payload,
            cancel);

        if (!response.IsSuccessStatusCode)
        {
            var body = await response.Content.ReadAsStringAsync(cancel);
            throw new HttpRequestException(
                $"Failed to submit signature for envelope {envelopeKey}: {(int)response.StatusCode} {response.StatusCode} - {body}");
        }
    }
}