import asyncio
import logging
import string
from apps.account.models import Notification, NotificationTemplate

logger = logging.getLogger(__name__)

class SafeFormatter(string.Formatter):
    def get_value(self, key, args, kwargs):
        if isinstance(key, str):
            if key not in kwargs:
                return f"{{{key}}}"
            return kwargs[key]
        return super().get_value(key, args, kwargs)

def get_template_context(user, notification_type, data):
    """
    Builds a dynamic context dictionary containing user info to format templates.
    """
    context = {
        'student_name': getattr(user, 'fullname', user.username) or user.username,
        'fullname': getattr(user, 'fullname', user.username) or user.username,
        'username': user.username,
    }
    return context

def resolve_notification_route(notification_type, data):
    """
    Resolves standard GoRouter paths based on notification type and payload data.
    """
    return None

def create_and_send_notification(user, title_en, body_en, title_fa=None, body_fa=None, service='imam-javad', 
                                 data=None, notification_type=None, action='navigate', navigate_to=None,
                                 title_ru=None, body_ru=None):
    """
    Creates a Notification record in the database and sends a push notification to FCM.
    Loads and renders the NotificationTemplate from the database if present.
    If the template is inactive, the notification is discarded.
    """
    # Map Persian arguments to Russian to preserve backward compatibility with existing signals/tasks
    title_ru = title_ru or title_fa
    body_ru = body_ru or body_fa

    # Auto-resolve notification type from data payload if not provided
    if not notification_type and isinstance(data, dict):
        notification_type = data.get('type')

    # 1. Check for template settings in the database
    if notification_type:
        template = NotificationTemplate.objects.filter(notification_type=notification_type).first()
        if template:
            if not template.is_active:
                logger.info(f"Notification type '{notification_type}' is disabled via database template settings.")
                return None
            # Override templates with database values
            title_ru = template.title_ru
            title_en = template.title_en
            body_ru = template.body_ru
            body_en = template.body_en

    # 2. Render templates safely with dynamic context
    context = get_template_context(user, notification_type, data)
    formatter = SafeFormatter()

    try:
        title_ru = formatter.format(title_ru, **context) if title_ru else ""
        title_en = formatter.format(title_en, **context) if title_en else ""
        body_ru = formatter.format(body_ru, **context) if body_ru else ""
        body_en = formatter.format(body_en, **context) if body_en else ""
    except Exception as e:
        logger.error(f"Error formatting templates: {e}")

    # Determine user localized text
    lang = getattr(user, 'language', None)
    lang_code = lang.code if lang and hasattr(lang, 'code') else 'ru'
    
    title = title_ru if lang_code == 'ru' else title_en
    message = body_ru if lang_code == 'ru' else body_en

    # Auto-resolve GoRouter navigation route if not provided
    if not navigate_to and notification_type:
        navigate_to = resolve_notification_route(notification_type, data)

    # Save to database
    from apps.account.tasks import send_notification
    notif = Notification.objects.create(
        user=user,
        title=title,
        message=message,
        service=service,
        notification_type=notification_type,
        action=action,
        navigate_to=navigate_to
    )
    
    fcm_token = getattr(user, 'fcm', None)
    if fcm_token:
        # Prepare the payload including the new routing properties
        fcm_data = dict(data or {})
        fcm_data.setdefault('type', notification_type or '')
        fcm_data.setdefault('action', action or '')
        fcm_data.setdefault('navigate_to', navigate_to or '')

        try:
            try:
                loop = asyncio.get_event_loop()
            except RuntimeError:
                loop = asyncio.new_event_loop()
                asyncio.set_event_loop(loop)
                
            if loop.is_running():
                loop.create_task(send_notification([fcm_token], title, message, fcm_data))
            else:
                loop.run_until_complete(send_notification([fcm_token], title, message, fcm_data))
        except Exception as e:
            logger.error(f"Failed to send push notification via FCM: {e}")
            
    return notif