// =====================================================
// 郵件服務
// =====================================================

import nodemailer from 'nodemailer';

// 郵件配置
const emailConfig = {
  host: process.env.SMTP_HOST || 'smtp.gmail.com',
  port: parseInt(process.env.SMTP_PORT || '587'),
  secure: false, // true for 465, false for other ports
  auth: {
    user: process.env.SMTP_USER,
    pass: process.env.SMTP_PASS,
  },
};

// 創建郵件傳輸器
const transporter = nodemailer.createTransport(emailConfig);

export class EmailService {
  // 發送密碼重設郵件
  static async sendPasswordResetEmail(email: string, resetToken: string, userName: string) {
    try {
      const resetUrl = `${process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000'}/reset-password?token=${resetToken}`;
      
      const mailOptions = {
        from: `"${process.env.NEXT_PUBLIC_APP_NAME || 'AI 展示平台'}" <${emailConfig.auth.user}>`,
        to: email,
        subject: '密碼重設請求',
        html: `
          <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
            <div style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); padding: 30px; text-align: center;">
              <h1 style="color: white; margin: 0; font-size: 24px;">密碼重設請求</h1>
            </div>
            
            <div style="padding: 30px; background: #f9f9f9;">
              <h2 style="color: #333; margin-top: 0;">親愛的 ${userName}，</h2>
              
              <p style="color: #666; line-height: 1.6;">
                我們收到了您的密碼重設請求。請點擊下方按鈕來重設您的密碼：
              </p>
              
              <div style="text-align: center; margin: 30px 0;">
                <a href="${resetUrl}" 
                   style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); 
                          color: white; 
                          padding: 15px 30px; 
                          text-decoration: none; 
                          border-radius: 5px; 
                          display: inline-block;
                          font-weight: bold;">
                  重設密碼
                </a>
              </div>
              
              <p style="color: #666; line-height: 1.6; font-size: 14px;">
                如果按鈕無法點擊，請複製以下連結到瀏覽器中：<br>
                <a href="${resetUrl}" style="color: #667eea; word-break: break-all;">${resetUrl}</a>
              </p>
              
              <div style="background: #fff3cd; border: 1px solid #ffeaa7; padding: 15px; border-radius: 5px; margin: 20px 0;">
                <p style="color: #856404; margin: 0; font-size: 14px;">
                  <strong>注意：</strong>此連結將在 1 小時後過期，請盡快完成密碼重設。
                </p>
              </div>
              
              <p style="color: #666; line-height: 1.6; font-size: 14px;">
                如果您沒有請求密碼重設，請忽略此郵件。您的密碼將保持不變。
              </p>
            </div>
            
            <div style="background: #333; color: white; padding: 20px; text-align: center; font-size: 12px;">
              <p style="margin: 0;">此郵件由 ${process.env.NEXT_PUBLIC_APP_NAME || 'AI 展示平台'} 系統自動發送</p>
            </div>
          </div>
        `,
      };

      const result = await transporter.sendMail(mailOptions);
      console.log('密碼重設郵件發送成功:', result.messageId);
      return { success: true, messageId: result.messageId };
      
    } catch (error) {
      console.error('發送密碼重設郵件失敗:', error);
      return { success: false, error: error.message };
    }
  }

  // 測試郵件配置
  static async testEmailConfig() {
    try {
      await transporter.verify();
      console.log('郵件配置驗證成功');
      return { success: true };
    } catch (error) {
      console.error('郵件配置驗證失敗:', error);
      return { success: false, error: error.message };
    }
  }
}