const emailService = require('../services/email');
const nocoDB = require('../services/nocodb');
const crypto = require('crypto');

class EmailsController {
  async sendEmail(req, res, next) {
    try {
      const { recipientEmail, senderName, senderEmail, subject, message, postalCode, recipientName } = req.body;
      
      // Send the email using template system
      const emailResult = await emailService.sendRepresentativeEmail(
        recipientEmail,
        senderName,
        senderEmail,
        subject,
        message,
        postalCode,
        recipientName
      );

      // Log the email send event
      await nocoDB.logEmailSend({
        recipientEmail,
        senderName,
        senderEmail,
        subject,
        message,
        postalCode,
        status: emailResult.success ? 'sent' : 'failed',
        timestamp: new Date().toISOString(),
        senderIP: req.ip || req.connection.remoteAddress
      });

      if (emailResult.success) {
        res.json({
          success: true,
          message: 'Email sent successfully',
          messageId: emailResult.messageId
        });
      } else {
        res.status(500).json({
          success: false,
          error: 'Failed to send email',
          message: emailResult.error
        });
      }
    } catch (error) {
      console.error('Send email error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to send email',
        message: error.message
      });
    }
  }

  async previewEmail(req, res, next) {
    try {
      const { recipientEmail, subject, message, senderName, senderEmail, postalCode, recipientName } = req.body;
      
      const templateVariables = {
        MESSAGE: message,
        SENDER_NAME: senderName || 'Anonymous',
        SENDER_EMAIL: senderEmail || 'unknown@example.com',
        POSTAL_CODE: postalCode || 'Unknown',
        RECIPIENT_NAME: recipientName || 'Representative'
      };

      const emailOptions = {
        to: recipientEmail,
        from: {
          email: process.env.SMTP_FROM_EMAIL,
          name: process.env.SMTP_FROM_NAME
        },
        replyTo: senderEmail || process.env.SMTP_FROM_EMAIL,
        subject: subject
      };

      const preview = await emailService.previewTemplatedEmail('representative-contact', templateVariables, emailOptions);
      
      // Log the email preview event (non-blocking)
      try {
        await nocoDB.logEmailPreview({
          recipientEmail,
          senderName,
          senderEmail,
          subject,
          message,
          postalCode,
          timestamp: new Date().toISOString(),
          senderIP: req.ip || req.connection.remoteAddress
        });
      } catch (loggingError) {
        console.error('Failed to log email preview:', loggingError);
        // Don't fail the preview if logging fails
      }
      
      res.json({
        success: true,
        preview: preview,
        html: emailOptions.html
      });
    } catch (error) {
      console.error('Email preview error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to generate email preview',
        message: error.message
      });
    }
  }

  async sendTestEmail(req, res, next) {
    try {
      const { subject, message } = req.body;
      
      const testRecipient = process.env.TEST_EMAIL_RECIPIENT || req.user?.email || 'admin@example.com';
      
      const emailResult = await emailService.sendTestEmail(subject, message, testRecipient);

      if (emailResult.success) {
        res.json({
          success: true,
          message: 'Test email sent successfully',
          messageId: emailResult.messageId,
          sentTo: testRecipient,
          testMode: emailResult.testMode
        });
      } else {
        res.status(500).json({
          success: false,
          error: 'Failed to send test email',
          message: emailResult.error
        });
      }
    } catch (error) {
      console.error('Send test email error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to send test email',
        message: error.message
      });
    }
  }

  async getEmailLogs(req, res, next) {
    try {
      const { status, senderEmail, postalCode } = req.query;
      
      if (!process.env.NOCODB_TABLE_EMAILS) {
        return res.status(500).json({
          success: false,
          error: 'Email logging not configured'
        });
      }

      const filters = {};
      if (status) filters.status = status;
      if (senderEmail) filters.senderEmail = senderEmail;
      if (postalCode) filters.postalCode = postalCode;

      const logs = await nocoDB.getEmailLogs(filters);

      res.json({
        success: true,
        logs: logs || []
      });
    } catch (error) {
      console.error('Get email logs error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to retrieve email logs',
        message: error.message
      });
    }
  }

  async testSMTPConnection(req, res, next) {
    try {
      const testResult = await emailService.testConnection();
      
      res.json({
        success: testResult.success,
        message: testResult.message,
        error: testResult.error
      });
    } catch (error) {
      console.error('SMTP test error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to test SMTP connection',
        message: error.message
      });
    }
  }

  async testSMTPConnection(req, res, next) {
    try {
      const result = await emailService.testConnection();
      
      res.json({
        success: result.success,
        message: result.message,
        error: result.error
      });
    } catch (error) {
      console.error('SMTP test error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to test SMTP connection',
        message: error.message
      });
    }
  }

  async initiateEmailToCampaign(req, res, next) {
    try {
      const { email, subject, message, postalCode, senderName } = req.body;
      
      // Check if email verification is enabled
      const verificationEnabled = process.env.EMAIL_VERIFICATION_ENABLED !== 'false';
      if (!verificationEnabled) {
        return res.status(400).json({
          success: false,
          error: 'Email verification is not enabled'
        });
      }
      
      // Generate verification token
      const token = crypto.randomBytes(32).toString('hex');
      const expiryHours = parseInt(process.env.EMAIL_VERIFICATION_EXPIRY) || 24;
      const expiresAt = new Date(Date.now() + expiryHours * 60 * 60 * 1000);
      
      // Store token and campaign data
      await nocoDB.createEmailVerification({
        token,
        email,
        temp_campaign_data: JSON.stringify({
          subject,
          message,
          postalCode,
          senderName
        }),
        created_at: new Date().toISOString(),
        expires_at: expiresAt.toISOString(),
        used: false
      });
      
      // Send verification email
      const appUrl = process.env.APP_URL || 'http://localhost:3333';
      const verificationUrl = `${appUrl}/verify-email.html?token=${token}`;
      await emailService.sendEmailVerification(email, verificationUrl, senderName || 'there');
      
      res.json({
        success: true,
        message: 'Verification email sent. Please check your inbox.'
      });
    } catch (error) {
      console.error('Email to campaign conversion error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to initiate campaign conversion',
        message: error.message
      });
    }
  }

  async verifyEmailToken(req, res, next) {
    try {
      const { token } = req.params;
      
      // Find verification record
      const verification = await nocoDB.getEmailVerificationByToken(token);
      
      if (!verification) {
        return res.status(404).json({
          success: false,
          error: 'Invalid or expired verification link'
        });
      }
      
      // Check if already used
      if (verification.used) {
        return res.status(400).json({
          success: false,
          error: 'This verification link has already been used'
        });
      }
      
      // Check if expired
      const now = new Date();
      const expiresAt = new Date(verification.expires_at || verification.expiresAt || verification['Expires At']);
      if (now > expiresAt) {
        return res.status(400).json({
          success: false,
          error: 'This verification link has expired'
        });
      }
      
      // Mark as used
      const verificationId = verification.id || verification.Id || verification.ID;
      await nocoDB.updateEmailVerification(verificationId, { used: true });
      
      // Parse campaign data
      const campaignDataStr = verification.temp_campaign_data || verification.tempCampaignData || verification['Temp Campaign Data'];
      const campaignData = JSON.parse(campaignDataStr);
      
      // Check if user exists
      const userEmail = verification.email || verification.Email;
      const existingUser = await nocoDB.getUserByEmail(userEmail);
      
      if (existingUser) {
        // User exists, log them in automatically
        req.session.authenticated = true;
        req.session.userId = existingUser.ID || existingUser.Id || existingUser.id;
        req.session.userEmail = existingUser.Email || existingUser.email;
        req.session.userName = existingUser.Name || existingUser.name;
        req.session.isAdmin = existingUser.Admin || existingUser.admin || false;
        req.session.userType = existingUser['User Type'] || existingUser.UserType || existingUser.userType || 'user';
        
        req.session.save((err) => {
          if (err) {
            console.error('Session save error:', err);
            return res.status(500).json({
              success: false,
              error: 'Session error'
            });
          }
          
          res.json({
            success: true,
            needsAccount: false,
            campaignData: campaignData,
            redirectTo: '/dashboard.html'
          });
        });
      } else {
        // User doesn't exist - create a new user account automatically
        try {
          // Generate a temporary password (user can change it later)
          const tempPassword = crypto.randomBytes(16).toString('hex');
          
          // Extract name from campaign data or use email prefix
          const userName = campaignData.senderName || userEmail.split('@')[0];
          
          // Create new user
          const newUser = await nocoDB.createUser({
            'Name': userName,
            'Email': userEmail,
            'Password': tempPassword,
            'Admin': false,
            'User Type': 'user'
          });
          
          const userId = newUser.ID || newUser.Id || newUser.id || newUser;
          
          // Send login credentials email to the new user
          try {
            await emailService.sendLoginDetails({
              Name: userName,
              Email: userEmail,
              Password: tempPassword,
              admin: false
            });
            console.log('Welcome email with credentials sent to:', userEmail);
          } catch (emailError) {
            console.error('Failed to send welcome email:', emailError);
            // Don't fail the whole process if email sending fails
          }
          
          // Log the new user in automatically
          req.session.authenticated = true;
          req.session.userId = userId;
          req.session.userEmail = userEmail;
          req.session.userName = userName;
          req.session.isAdmin = false;
          req.session.userType = 'user';
          
          req.session.save((err) => {
            if (err) {
              console.error('Session save error:', err);
              return res.status(500).json({
                success: false,
                error: 'Session error'
              });
            }
            
            res.json({
              success: true,
              needsAccount: false,
              isNewUser: true,
              campaignData: campaignData,
              redirectTo: '/dashboard.html',
              message: 'Account created successfully! Check your email for login credentials.'
            });
          });
        } catch (createError) {
          console.error('Error creating user account:', createError);
          return res.status(500).json({
            success: false,
            error: 'Failed to create user account',
            message: createError.message
          });
        }
      }
    } catch (error) {
      console.error('Email verification error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to verify email',
        message: error.message
      });
    }
  }
}

module.exports = new EmailsController();