"""
Feedback Tracking Service
Tracks which events users have already given feedback for
"""
from typing import Optional, Dict
from pymongo.collection import Collection
from datetime import datetime


class FeedbackTrackingService:
    """
    Track feedback status per user per event
    Prevents redundant "check purchase history" calls
    """
    
    def __init__(self, mongo_collection: Collection):
        self.collection = mongo_collection
        self._ensure_indexes()
    
    def _ensure_indexes(self):
        """Create indexes for fast lookup"""
        try:
            # Compound index for quick lookup
            self.collection.create_index([("user_id", 1), ("event_code", 1)], unique=True)
            self.collection.create_index("user_id")
            print("✓ Feedback tracking indexes created")
        except Exception as e:
            print(f"Feedback tracking indexes exist: {e}")
    
    def has_given_feedback(self, user_id: str, event_code: str) -> bool:
        """
        Check if user has already given feedback for this event
        
        Args:
            user_id: User ID
            event_code: Event code
        
        Returns:
            True if feedback already given, False otherwise
        """
        result = self.collection.find_one({
            "user_id": user_id,
            "event_code": event_code,
            "is_feedback": True
        })
        return result is not None
    
    def mark_feedback_given(self, user_id: str, event_code: str, rating: int, comment: str = "") -> bool:
        """
        Mark that user has given feedback for this event
        
        Args:
            user_id: User ID
            event_code: Event code
            rating: Rating given (1-5)
            comment: Feedback comment
        
        Returns:
            True if saved successfully
        """
        try:
            self.collection.update_one(
                {
                    "user_id": user_id,
                    "event_code": event_code
                },
                {
                    "$set": {
                        "is_feedback": True,
                        "rating": rating,
                        "comment": comment,
                        "feedback_date": datetime.utcnow(),
                        "updated_at": datetime.utcnow()
                    },
                    "$setOnInsert": {
                        "created_at": datetime.utcnow()
                    }
                },
                upsert=True
            )
            print(f"✅ Marked feedback: {user_id} → {event_code} (rating: {rating})")
            return True
        except Exception as e:
            print(f"❌ Error marking feedback: {e}")
            return False
    
    def get_pending_events(self, user_id: str, purchased_events: list) -> list:
        """
        Filter purchased events to only those without feedback
        
        Args:
            user_id: User ID
            purchased_events: List of events user has purchased
        
        Returns:
            List of events that need feedback
        """
        pending = []
        for event in purchased_events:
            event_code = event.get("eventCode")
            if event_code and not self.has_given_feedback(user_id, event_code):
                pending.append(event)
        return pending