using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace OASystem.API.OAMethodLib.HotmailEmail
{
    public class HotmailEmailService : IHotmailEmailService
    {
        private readonly IConfiguration _config;
        private readonly ILogger<HotmailEmailService> _logger;

        public HotmailEmailService(IConfiguration config, ILogger<HotmailEmailService> logger)
        {
            _config = config;
            _logger = logger;
        }

        public async Task<bool> SendEmailAsync(string toEmail, string subject, string htmlContent)
        {
            // 1. 配置前置校验
            string smtpServer = _config["HotEmailConfig:SmtpServer"] ?? string.Empty;
            int smtpPort = _config.GetValue<int>("HotEmailConfig:SmtpPort", 587);
            string appPassword = _config["HotEmailConfig:AppPassword"];
            string senderEmail = _config["HotEmailConfig:SenderEmail"];
            string senderName = _config["HotEmailConfig:SenderName"];

            if (string.IsNullOrEmpty(smtpServer) || string.IsNullOrEmpty(appPassword))
            {
                _logger.LogError("[Config Alchemy] 无法从 JSON 获取必要的邮件配置节点。");
                return false;
            }

            // 2. 构建邮件内容
            var message = new MimeMessage();
            message.From.Add(new MailboxAddress(senderName, senderEmail));

            if (!MailboxAddress.TryParse(toEmail, out var recipient))
            {
                _logger.LogWarning("[Email] 收件人地址非法: {ToEmail}", toEmail);
                return false;
            }
            message.To.Add(recipient);
            message.Subject = subject;

            var bodyBuilder = new BodyBuilder { HtmlBody = htmlContent };
            message.Body = bodyBuilder.ToMessageBody();

            // 3. 客户端连接与发送
            using var client = new SmtpClient();
            try
            {
                // Hotmail/Outlook 通常使用 587 + StartTls 或 465 + SslOnConnect
                var secureOption = smtpPort == 465
                    ? SecureSocketOptions.SslOnConnect
                    : SecureSocketOptions.StartTls;

                // 设置超时 (建议 30-60 秒)
                client.Timeout = 30000;

                await client.ConnectAsync(smtpServer, smtpPort, secureOption);
                await client.AuthenticateAsync(senderEmail, appPassword);
                await client.SendAsync(message);
                await client.DisconnectAsync(true);

                _logger.LogInformation("[Email] 成功发送至: {ToEmail}", toEmail);
                return true;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "[Email] 发送失败，目标: {ToEmail}", toEmail);
                return false;
            }
        }
    }
}