using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;

namespace OASystem.API.OAMethodLib.HotmailEmail
{
    /// <summary>
    /// Hotemail 服务
    /// </summary>
    public class HotmailEmailService : IHotmailEmailService
    {
        private readonly IConfiguration _configuration;

        public HotmailEmailService(IConfiguration configuration)
        {
            _configuration = configuration;
        }

        public async Task<bool> SendEmailAsync(string toEmail, string subject, string htmlContent)
        {
            // 从配置读取信息
            var smtpServer = _configuration["HotEmailConfig:SmtpServer"];
            var smtpPort = int.Parse(_configuration["HotEmailConfig:SmtpPort"]);
            var senderEmail = _configuration["HotEmailConfig:SenderEmail"];
            var senderName = _configuration["HotEmailConfig:SenderName"];
            var appPassword = _configuration["HotEmailConfig:AppPassword"];

            // 移除应用密码中的所有 "-" 分隔符
            appPassword = appPassword?.Replace("-", "");

            // 验证配置必填项
            if (string.IsNullOrEmpty(smtpServer) || string.IsNullOrEmpty(senderEmail) || string.IsNullOrEmpty(appPassword))
            {
                Console.WriteLine("[Email Error]: 邮件配置不完整");
                return false;
            }

            var message = new MimeMessage();
            message.From.Add(new MailboxAddress(senderName, senderEmail));

            // 校验收件人邮箱格式，避免无效地址报错
            if (!MailboxAddress.TryParse(toEmail, out var recipient))
            {
                Console.WriteLine($"[Email Error]: 收件人邮箱格式错误 - {toEmail}");
                return false;
            }
            message.To.Add(recipient);

            message.Subject = subject;

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

            using var client = new SmtpClient();
            try
            {
                // 显式设置超时时间，避免连接超时
                client.Timeout = 30000; // 30秒超时

                // 连接服务器 (Hotmail/Outlook 必须使用 StartTls)
                await client.ConnectAsync(smtpServer, smtpPort, SecureSocketOptions.StartTls);

                // 身份验证
                await client.AuthenticateAsync(senderEmail, appPassword);

                // 执行发送
                await client.SendAsync(message);
                await client.DisconnectAsync(true);

                Console.WriteLine($"[Email Success]: 邮件已发送至 {toEmail}");
                return true;
            }
            catch (Exception ex)
            {
                // 打印完整异常链，定位真实错误
                var errorMsg = $"[Email Error]: {ex.Message}";
                var innerEx = ex.InnerException;
                while (innerEx != null)
                {
                    errorMsg += $"\n[Inner Error]: {innerEx.Message}";
                    innerEx = innerEx.InnerException;
                }
                Console.WriteLine(errorMsg);
                return false;
            }
        }
    }
}