import asyncio
import logging
from apps.account.models import Notification
from apps.account.tasks import send_notification

logger = logging.getLogger(__name__)

def resolve_notification_route(notification_type, data):
    """
    Resolves standard GoRouter paths based on notification type and payload data.
    """
    if not data or not isinstance(data, dict):
        return None

    # Import models dynamically inside function to avoid circular imports
    from apps.course.models.course import Course
    from apps.course.models.live_session import CourseLiveSession

    try:
        # Group 1: Course related paths (/course_info?slug=...)
        if notification_type in ['course_registered', 'course_completed', 'new_course_weekly', 
                                 'live_class_rescheduled', 'live_class_cancelled', 
                                 'live_recording_available', 'missed_live_sessions',
                                 'course_access_granted']:
            course_id = data.get('course_id')
            if not course_id and 'session_id' in data:
                session = CourseLiveSession.objects.filter(id=data['session_id']).first()
                if session:
                    course_id = session.course_id
            
            if course_id:
                course = Course.objects.filter(id=course_id).first()
                if course:
                    slug = course.slug[0].get('title') if isinstance(course.slug, list) and course.slug else course.slug
                    return f"/course_info?slug={slug}"

        # Group 2: Lesson path (/lesson?slug=...)
        elif notification_type == 'lesson_completed':
            course_id = data.get('course_id')
            if course_id:
                course = Course.objects.filter(id=course_id).first()
                if course:
                    slug = course.slug[0].get('title') if isinstance(course.slug, list) and course.slug else course.slug
                    return f"/lesson?slug={slug}"

        # Group 3: Quiz path (/course_info/quiz?slug=...)
        elif notification_type == 'low_quiz_result':
            from apps.quiz.models import Quiz
            quiz = Quiz.objects.filter(id=data.get('quiz_id')).first()
            if quiz and quiz.course:
                course = quiz.course
                slug = course.slug[0].get('title') if isinstance(course.slug, list) and course.slug else course.slug
                return f"/course_info/quiz?slug={slug}"

        # Group 4: Chat Room path (/chat/chat_details?room_id=...)
        elif notification_type in ['teacher_reply', 'support_reply']:
            room_id = data.get('room_id')
            if room_id:
                return f"/chat/chat_details?room_id={room_id}"

        # Group 5: Transactions path
        elif notification_type in ['payment_successful', 'payment_failed', 'refund_completed']:
            return "/profile/transactions"

        # Group 6: Home path
        elif notification_type == 'student_inactivity':
            return "/home"

    except Exception as e:
        logger.error(f"Error resolving route for type={notification_type}, data={data}: {e}")

    return None

def create_and_send_notification(user, title_en, body_en, title_fa, body_fa, service='imam-javad', 
                                 data=None, notification_type=None, action='navigate', navigate_to=None):
    """
    Creates a Notification record in the database and sends a push notification to FCM.
    Resolves localized title and body based on user.language.
    """
    lang = getattr(user, 'language', None)
    lang_code = lang.code if lang and hasattr(lang, 'code') else 'fa'
    
    title = title_fa if lang_code == 'fa' else title_en
    message = body_fa if lang_code == 'fa' else body_en
    
    # Auto-resolve notification type from data payload if not provided
    if not notification_type and isinstance(data, dict):
        notification_type = data.get('type')

    # 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
    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