kaauh_ats/recruitment/email_service.py

"""
Email service for sending notifications related to agency messaging.
"""

from django.core.mail import send_mail, EmailMultiAlternatives
from django.conf import settings
from django.template.loader import render_to_string
from django.utils.html import strip_tags
import logging

logger = logging.getLogger(__name__)


class EmailService:
    """
    Service class for handling email notifications
    """

    def send_email(self, recipient_email, subject, body, html_body=None):
        """
        Send email using Django's send_mail function

        Args:
            recipient_email: Email address to send to
            subject: Email subject
            body: Plain text email body
            html_body: HTML email body (optional)

        Returns:
            dict: Result with success status and error message if failed
        """
        try:
            send_mail(
                subject=subject,
                message=body,
                from_email=getattr(settings, 'DEFAULT_FROM_EMAIL', 'noreply@kaauh.edu.sa'),
                recipient_list=[recipient_email],
                html_message=html_body,
                fail_silently=False,
            )

            logger.info(f"Email sent successfully to {recipient_email}")
            return {'success': True}

        except Exception as e:
            error_msg = f"Failed to send email to {recipient_email}: {str(e)}"
            logger.error(error_msg)
            return {'success': False, 'error': error_msg}


def send_agency_welcome_email(agency, access_link=None):
    """
    Send welcome email to a new agency with portal access information.

    Args:
        agency: HiringAgency instance
        access_link: AgencyAccessLink instance (optional)

    Returns:
        bool: True if email was sent successfully, False otherwise
    """
    try:
        if not agency.email:
            logger.warning(f"No email found for agency {agency.id}")
            return False

        context = {
            'agency': agency,
            'access_link': access_link,
            'portal_url': getattr(settings, 'AGENCY_PORTAL_URL', 'https://kaauh.edu.sa/portal/'),
        }

        # Render email templates
        html_message = render_to_string('recruitment/emails/agency_welcome.html', context)
        plain_message = strip_tags(html_message)

        # Send email
        send_mail(
            subject='Welcome to KAAUH Recruitment Portal',
            message=plain_message,
            from_email=getattr(settings, 'DEFAULT_FROM_EMAIL', 'noreply@kaauh.edu.sa'),
            recipient_list=[agency.email],
            html_message=html_message,
            fail_silently=False,
        )

        logger.info(f"Welcome email sent to agency {agency.email}")
        return True

    except Exception as e:
        logger.error(f"Failed to send agency welcome email: {str(e)}")
        return False


def send_assignment_notification_email(assignment, message_type='created'):
    """
    Send email notification about assignment changes.

    Args:
        assignment: AgencyJobAssignment instance
        message_type: Type of notification ('created', 'updated', 'deadline_extended')

    Returns:
        bool: True if email was sent successfully, False otherwise
    """
    try:
        if not assignment.agency.email:
            logger.warning(f"No email found for agency {assignment.agency.id}")
            return False

        context = {
            'assignment': assignment,
            'agency': assignment.agency,
            'job': assignment.job,
            'message_type': message_type,
            'portal_url': getattr(settings, 'AGENCY_PORTAL_URL', 'https://kaauh.edu.sa/portal/'),
        }

        # Render email templates
        html_message = render_to_string('recruitment/emails/assignment_notification.html', context)
        plain_message = strip_tags(html_message)

        # Determine subject based on message type
        subjects = {
            'created': f'New Job Assignment: {assignment.job.title}',
            'updated': f'Assignment Updated: {assignment.job.title}',
            'deadline_extended': f'Deadline Extended: {assignment.job.title}',
        }
        subject = subjects.get(message_type, f'Assignment Notification: {assignment.job.title}')

        # Send email
        send_mail(
            subject=subject,
            message=plain_message,
            from_email=getattr(settings, 'DEFAULT_FROM_EMAIL', 'noreply@kaauh.edu.sa'),
            recipient_list=[assignment.agency.email],
            html_message=html_message,
            fail_silently=False,
        )

        logger.info(f"Assignment notification email sent to {assignment.agency.email} for {message_type}")
        return True

    except Exception as e:
        logger.error(f"Failed to send assignment notification email: {str(e)}")
        return False


def send_interview_invitation_email(candidate, job, meeting_details=None, recipient_list=None):
    """
    Send interview invitation email using HTML template.

    Args:
        candidate: Candidate instance
        job: Job instance
        meeting_details: Dictionary with meeting information (optional)
        recipient_list: List of additional email addresses (optional)

    Returns:
        dict: Result with success status and error message if failed
    """
    try:
        # Prepare recipient list
        recipients = []
        if candidate.email:
            recipients.append(candidate.email)
        if recipient_list:
            recipients.extend(recipient_list)

        if not recipients:
            return {'success': False, 'error': 'No recipient email addresses provided'}

        # Prepare context for template
        context = {
            'candidate_name': candidate.full_name or candidate.name,
            'candidate_email': candidate.email,
            'candidate_phone': candidate.phone or '',
            'job_title': job.title,
            'department': getattr(job, 'department', ''),
            'company_name': getattr(settings, 'COMPANY_NAME', 'Norah University'),
        }

        # Add meeting details if provided
        if meeting_details:
            context.update({
                'meeting_topic': meeting_details.get('topic', f'Interview for {job.title}'),
                'meeting_date_time': meeting_details.get('date_time', ''),
                'meeting_duration': meeting_details.get('duration', '60 minutes'),
                'join_url': meeting_details.get('join_url', ''),
            })

        # Render HTML template
        html_message = render_to_string('emails/interview_invitation.html', context)
        plain_message = strip_tags(html_message)

        # Create email with both HTML and plain text versions
        email = EmailMultiAlternatives(
            subject=f'Interview Invitation: {job.title}',
            body=plain_message,
            from_email=getattr(settings, 'DEFAULT_FROM_EMAIL', 'noreply@kaauh.edu.sa'),
            to=recipients,
        )
        email.attach_alternative(html_message, "text/html")

        # Send email
        email.send(fail_silently=False)

        logger.info(f"Interview invitation email sent successfully to {', '.join(recipients)}")
        return {
            'success': True,
            'recipients_count': len(recipients),
            'message': f'Interview invitation sent successfully to {len(recipients)} recipient(s)'
        }

    except Exception as e:
        error_msg = f"Failed to send interview invitation email: {str(e)}"
        logger.error(error_msg, exc_info=True)
        return {'success': False, 'error': error_msg}


def send_bulk_email(subject, message, recipient_list, request=None, attachments=None, async_task_=False):
    """
    Send bulk email to multiple recipients with HTML support and attachments.

    Args:
        subject: Email subject
        message: Email message (can be HTML)
        recipient_list: List of email addresses
        request: Django request object (optional)
        attachments: List of file attachments (optional)
        async_task: Whether to run as background task (default: False)

    Returns:
        dict: Result with success status and error message if failed
    """
    # Handle async task execution
    if async_task_:
        print("hereeeeeee")
        from django_q.tasks import async_task

        # Process attachments for background task serialization
        # processed_attachments = []
        # if attachments:
        #     for attachment in attachments:
        #         if hasattr(attachment, 'read'):
        #             # File-like object - save to temporary file
        #             filename = getattr(attachment, 'name', 'attachment')
        #             content_type = getattr(attachment, 'content_type', 'application/octet-stream')

        #             # Create temporary file
        #             with tempfile.NamedTemporaryFile(delete=False, suffix=f'_{filename}') as temp_file:
        #                 content = attachment.read()
        #                 temp_file.write(content)
        #                 temp_file_path = temp_file.name

        #             # Store file info for background task
        #             processed_attachments.append({
        #                 'file_path': temp_file_path,
        #                 'filename': filename,
        #                 'content_type': content_type
        #             })
        #         elif isinstance(attachment, tuple) and len(attachment) == 3:
        #             # (filename, content, content_type) tuple - can be serialized directly
        #             processed_attachments.append(attachment)

        # Queue the email sending as a background task
        task_id = async_task(
            'recruitment.tasks.send_bulk_email_task',
            subject,
            message,
            recipient_list,
            request,
        )
        logger.info(f"Bulk email queued as background task with ID: {task_id}")
        return {
            'success': True,
            'async': True,
            'task_id': task_id,
            'message': f'Email queued for background sending to {len(recipient_list)} recipient(s)'
        }

    # Synchronous execution (default behavior)
    try:
        if not recipient_list:
            return {'success': False, 'error': 'No recipients provided'}

        # Clean recipient list and remove duplicates
        clean_recipients = []
        seen_emails = set()

        for recipient in recipient_list:
            email = recipient.strip().lower()
            if email and email not in seen_emails:
                clean_recipients.append(email)
                seen_emails.add(email)

        if not clean_recipients:
            return {'success': False, 'error': 'No valid email addresses found'}

        # Prepare email content
        from_email = getattr(settings, 'DEFAULT_FROM_EMAIL', 'noreply@kaauh.edu.sa')

        # Check if message contains HTML tags
        is_html = '<' in message and '>' in message

        if is_html:
            # Create HTML email with plain text fallback
            plain_message = strip_tags(message)

            # Create email with both HTML and plain text versions
            email = EmailMultiAlternatives(
                subject=subject,
                body=plain_message,
                from_email=from_email,
                to=clean_recipients,
            )
            email.attach_alternative(message, "text/html")
        else:
            # Plain text email
            email = EmailMultiAlternatives(
                subject=subject,
                body=message,
                from_email=from_email,
                to=clean_recipients,
            )

        # Add attachments if provided
        # if attachments:
        #     for attachment in attachments:
        #         if hasattr(attachment, 'read'):
        #             # File-like object
        #             filename = getattr(attachment, 'name', 'attachment')
        #             content = attachment.read()
        #             content_type = getattr(attachment, 'content_type', 'application/octet-stream')
        #             email.attach(filename, content, content_type)
        #         elif isinstance(attachment, tuple) and len(attachment) == 3:
        #             # (filename, content, content_type) tuple
        #             filename, content, content_type = attachment
        #             email.attach(filename, content, content_type)

        # Send email
        email.send(fail_silently=False)

        logger.info(f"Bulk email sent successfully to {len(clean_recipients)} recipients")
        return {
            'success': True,
            'recipients_count': len(clean_recipients),
            'message': f'Email sent successfully to {len(clean_recipients)} recipient(s)'
        }

    except Exception as e:
        error_msg = f"Failed to send bulk email: {str(e)}"
        logger.error(error_msg, exc_info=True)
        return {'success': False, 'error': error_msg}