"""Celery tasks for the appreciation module."""
import logging

from celery import shared_task

logger = logging.getLogger(__name__)


@shared_task
def send_appreciation_notifications(
    appreciation_id,
    staff_id=None,
    note="",
    email_subject="",
    email_body="",
    host="",
):
    """Send email + SMS to champion, manager, and appreciated staff in the background.

    Replaces the synchronous notification loop that used to block the
    appreciation_send_to response.
    """
    from apps.appreciation.models import Appreciation
    from apps.notifications.services import NotificationService, get_email_header_html
    from apps.organizations.department_contacts import get_champion_and_manager, _staff_contact
    from apps.organizations.models import Staff

    try:
        appreciation = Appreciation.objects.select_related("department", "hospital").get(pk=appreciation_id)
    except Appreciation.DoesNotExist:
        logger.error(f"Appreciation {appreciation_id} not found for notification task")
        return

    department = appreciation.department
    if not department:
        logger.warning(f"Appreciation {appreciation_id} has no department, skipping notifications")
        return

    targets = get_champion_and_manager(department)
    link = f"https://{host}/appreciation/detail/{appreciation.pk}/"
    notified = []

    # Notify champion + manager
    for target in targets:
        display_name = (
            target["staff"].get_full_name() if target.get("staff")
            else (target["user"].get_full_name() if target.get("user") else target["label"])
        )
        if target.get("email"):
            try:
                send_subject = email_subject or f"Appreciation Sent to Department - {appreciation.reference_number}"
                send_body = email_body or (
                    f"Appreciation #{appreciation.reference_number} has been sent to your department ({department.name})."
                )
                NotificationService.send_email(
                    email=target["email"],
                    subject=send_subject,
                    message=send_body + f"\n\n{link}",
                    html_message=f"""
                    <div style="font-family: 'Segoe UI', Tahoma, sans-serif; max-width: 600px; margin: 0 auto; border: 1px solid #e5e7eb; border-radius: 8px; overflow: hidden;">
                        {get_email_header_html()}
                        <div style="padding: 20px;">
                            <h2 style="color: #005696; font-size: 18px; margin: 0 0 12px 0;">Appreciation Sent to Department</h2>
                            <p>Appreciation <strong>#{appreciation.reference_number}</strong> has been sent to your department <strong>({department.name})</strong>.</p>
                            <p><strong>Message:</strong> {appreciation.message_en or 'N/A'}</p>
                            {f'<p><strong>Note:</strong> {note}</p>' if note else ''}
                            <p><strong>Role:</strong> {target['label']}</p>
                            <p><a href="{link}">View Appreciation</a></p>
                        </div>
                    </div>
                    """,
                    related_object=appreciation,
                )
            except Exception:
                logger.exception(f"Failed to send email to {target.get('email')}")
        if target.get("phone"):
            try:
                NotificationService.send_sms(
                    target["phone"],
                    f"PX360: Appreciation #{appreciation.reference_number} sent to {department.name}. {link}",
                    related_object=appreciation,
                )
            except Exception:
                pass
        notified.append(f"{display_name} ({target['label']})")

    # Notify the appreciated staff member
    if staff_id:
        try:
            appreciated_staff = Staff.objects.get(id=staff_id)
        except Staff.DoesNotExist:
            appreciated_staff = None

        if appreciated_staff:
            s_email, s_phone = _staff_contact(appreciated_staff)
            s_name = appreciated_staff.get_full_name()
            if s_email:
                try:
                    NotificationService.send_email(
                        email=s_email,
                        subject=f"An Appreciation Has Been Submitted About You - {appreciation.reference_number}",
                        message=f"An appreciation (#{appreciation.reference_number}) has been submitted about you.\n\nMessage: {appreciation.message_en or 'N/A'}\n\nView: {link}",
                        html_message=f"""
                        <div style="font-family: 'Segoe UI', Tahoma, sans-serif; max-width: 600px; margin: 0 auto; border: 1px solid #e5e7eb; border-radius: 8px; overflow: hidden;">
                            {get_email_header_html()}
                            <div style="padding: 20px;">
                                <h2 style="color: #005696; font-size: 18px; margin: 0 0 12px 0;">You've Been Appreciated!</h2>
                                <p>An appreciation <strong>#{appreciation.reference_number}</strong> has been submitted about you.</p>
                                <p><strong>Message:</strong> {appreciation.message_en or 'N/A'}</p>
                                {f'<p><strong>Note:</strong> {note}</p>' if note else ''}
                                <p><a href="{link}">View Appreciation</a></p>
                            </div>
                        </div>
                        """,
                        related_object=appreciation,
                    )
                    notified.append(f"{s_name} (Staff)")
                except Exception:
                    logger.exception(f"Failed to send email to staff {s_email}")
            if s_phone:
                try:
                    NotificationService.send_sms(
                        s_phone,
                        f"PX360: An appreciation has been submitted about you. {link}",
                        related_object=appreciation,
                    )
                except Exception:
                    pass

    logger.info(f"Appreciation {appreciation_id} notifications sent to: {', '.join(notified)}")