using System.Net;
using dy.net.model.entity;

namespace dy.net.service
{
    public sealed class LiveEmailNotificationService
    {
        private readonly EmailNotificationSettingsService _settingsService;
        private readonly IEmailNotificationSender _sender;

        public LiveEmailNotificationService(
            EmailNotificationSettingsService settingsService,
            IEmailNotificationSender sender)
        {
            _settingsService = settingsService;
            _sender = sender;
        }

        public Task<string> GetReadinessErrorAsync() => _settingsService.GetReadinessErrorAsync();

        public async Task<(bool Sent, string Error)> SendLiveStartedAsync(
            DouyinFollowed follow,
            CancellationToken cancellationToken = default)
        {
            try
            {
                var settings = await _settingsService.GetAsync();
                if (!settings.Enabled || !follow.LiveEmailNotificationEnabled) return (false, null);
                var password = await _settingsService.GetPasswordAsync(settings);
                var roomUrl = !string.IsNullOrWhiteSpace(follow.LiveWebRid)
                    ? "https://live.douyin.com/" + Uri.EscapeDataString(follow.LiveWebRid)
                    : "https://www.douyin.com/user/" + Uri.EscapeDataString(follow.SecUid ?? string.Empty);
                var blogger = WebUtility.HtmlEncode(follow.UperName ?? "关注博主");
                var title = WebUtility.HtmlEncode(follow.LiveTitle ?? "正在直播");
                var safeUrl = WebUtility.HtmlEncode(roomUrl);
                var subject = $"[dysync.net] {follow.UperName ?? "关注博主"} 开播了";
                var body = $"<h2>{blogger} 正在直播</h2><p>{title}</p>" +
                           $"<p>检测时间：{DateTime.Now:yyyy-MM-dd HH:mm:ss}</p>" +
                           $"<p><a href=\"{safeUrl}\">进入直播间</a></p>";
                await _sender.SendAsync(settings, password, subject, body, cancellationToken);
                return (true, null);
            }
            catch (Exception ex) when (ex is not OperationCanceledException)
            {
                Serilog.Log.Warning(ex, "发送开播邮件失败：Blogger={Blogger}", follow.UperName);
                return (false, SafeError(ex));
            }
        }

        private static string SafeError(Exception ex)
        {
            var message = ex.GetBaseException().Message?.Trim();
            if (string.IsNullOrWhiteSpace(message)) return "开播邮件发送失败，请检查邮箱设置";
            return message.Length <= 1000 ? message : message[..1000];
        }
    }
}