import sys
import os
import logging
from sqlalchemy.orm import Session

# Add paths to access legacy and new modules
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../../../"))) # Root for legacy
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../../")))   # Company Explorer Root

# Legacy Import
try:
    from _legacy_gsheets_system.google_sheet_handler import GoogleSheetHandler
    from _legacy_gsheets_system.config import Config as LegacyConfig
except ImportError as e:
    print(f"Failed to import legacy modules: {e}")
    sys.exit(1)

# New DB
from backend.database import SessionLocal, Company, init_db

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger("LegacyImporter")

def migrate():
    logger.info("Starting migration from Google Sheets...")
    
    # 1. Connect to GSheets
    LegacyConfig.load_api_keys() # Ensure keys are loaded
    try:
        handler = GoogleSheetHandler()
        df = handler.get_sheet_as_dataframe("CRM_Accounts") # Assuming standard sheet name
    except Exception as e:
        logger.error(f"GSheet Connection failed: {e}")
        return

    if df is None or df.empty:
        logger.warning("No data found in sheet.")
        return

    logger.info(f"Found {len(df)} rows. Transforming...")

    # 2. Connect to New DB
    init_db() # Ensure tables exist
    db = SessionLocal()

    count = 0
    skipped = 0

    try:
        for _, row in df.iterrows():
            name = str(row.get('CRM Name', '')).strip()
            if not name or name.lower() in ['nan', 'none', '']:
                continue

            # Check duplicate (simple check by name for migration)
            exists = db.query(Company).filter(Company.name == name).first()
            if exists:
                skipped += 1
                continue

            # Create Company
            comp = Company(
                name=name,
                website=str(row.get('CRM Website', '')).strip() or None,
                crm_id=str(row.get('CRM ID', '')).strip() or None,
                city=str(row.get('CRM Ort', '')).strip() or None,
                country=str(row.get('CRM Land', 'DE')).strip(),
                status="IMPORTED" # Mark as imported so we know to enrich them
            )
            
            # Map old industry if useful, otherwise leave blank for re-classification
            # comp.industry_ai = str(row.get('Chat Vorschlag Branche', '')) 

            db.add(comp)
            count += 1
            
            if count % 100 == 0:
                logger.info(f"Committed {count}...")
                db.commit()

        db.commit()
        logger.info(f"Migration finished. Imported: {count}, Skipped: {skipped}")

    except Exception as e:
        logger.error(f"Migration error: {e}")
        db.rollback()
    finally:
        db.close()

if __name__ == "__main__":
    migrate()