using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
using Socialize.Api.Infrastructure.Emailer.Configuration;
using Socialize.Api.Infrastructure.Emailer.Contracts;
using Microsoft.Extensions.Options;

namespace Socialize.Api.Infrastructure.Emailer.Services;

public class ResendEmailSender : IEmailSender
{
    private static readonly Uri EndpointUri = new("https://api.resend.com/emails");
    private readonly HttpClient _httpClient;
    private readonly EmailerOptions _options;

    public ResendEmailSender(
        IHttpClientFactory httpClientFactory,
        IOptions<EmailerOptions> options)
    {
        _httpClient = httpClientFactory.CreateClient();
        _options = options.Value;

        _httpClient.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", _options.ApiKey);

        _httpClient.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));
    }

    public async Task SendEmailAsync(string toEmail, string subject, string htmlMessage)
    {
        var payload = new { from = _options.FromEmail, to = toEmail, subject, html = htmlMessage };

        string json = JsonSerializer.Serialize(payload);
        StringContent content = new(json, Encoding.UTF8, "application/json");

        HttpResponseMessage response = await _httpClient.PostAsync(EndpointUri, content);

        if (!response.IsSuccessStatusCode)
        {
            string body = await response.Content.ReadAsStringAsync();
            throw new InvalidOperationException(
                $"Resend email failed: {response.StatusCode} - {body}");
        }
    }
}