"""
One-time script to sync users.totalListings with actual listing counts.
Run this once to fix existing user counters.

Usage: python scripts/sync_total_listings.py
"""

import asyncio
from motor.motor_asyncio import AsyncIOMotorClient
from bson import ObjectId
import os
from dotenv import load_dotenv

load_dotenv()

MONGO_URI = os.getenv("MONGO_URI") or os.getenv("DATABASE_URL")

async def sync_total_listings():
    """Count actual listings per user and update their totalListings field."""
    
    print("🔄 Connecting to MongoDB...")
    client = AsyncIOMotorClient(MONGO_URI)
    # Get DB name from env or fallback
    DB_NAME = os.getenv("MONGODB_DATABASE", "lojiz_db")
    print(f"📂 Using Database: {DB_NAME}")
    
    db = client[DB_NAME]
    
    print("📊 Aggregating listing counts per user...")
    
    # Step 1: Aggregate listing counts by user_id
    pipeline = [
        {"$match": {"status": "active"}},  # Only count active listings
        {"$group": {
            "_id": "$user_id",
            "count": {"$sum": 1}
        }}
    ]
    
    listing_counts = {}
    async for doc in db.listings.aggregate(pipeline):
        user_id = doc["_id"]
        count = doc["count"]
        listing_counts[user_id] = count
    
    print(f"📋 Found {len(listing_counts)} users with listings")
    
    # Step 2: Get all users
    users_cursor = db.users.find({}, {"_id": 1, "email": 1, "totalListings": 1})
    
    updated_count = 0
    async for user in users_cursor:
        user_id = str(user["_id"])
        current_total = user.get("totalListings", 0)
        actual_count = listing_counts.get(user_id, 0)
        
        if current_total != actual_count:
            # Update the user's totalListings
            await db.users.update_one(
                {"_id": user["_id"]},
                {"$set": {"totalListings": actual_count}}
            )
            print(f"✅ Updated {user.get('email', user_id)}: {current_total} → {actual_count}")
            updated_count += 1
        else:
            print(f"⏭️  Skipped {user.get('email', user_id)}: already correct ({actual_count})")
    
    print(f"\n🎉 Done! Updated {updated_count} users.")
    client.close()


if __name__ == "__main__":
    asyncio.run(sync_total_listings())