#!/usr/bin/env python3
"""
CLI script for manual database migration.

Usage:
    python scripts/migrate_csv_to_db.py [--drop] [--geocode]

Options:
    --drop      Drop existing tables before migration (full reimport)
    --geocode   Geocode postcodes (requires network access)
"""

import sys
from pathlib import Path

# Add parent directory to path for imports
sys.path.insert(0, str(Path(__file__).parent.parent))

import argparse

from backend.config import settings
from backend.database import Base, engine, init_db, set_db_schema_version
from backend.migration import load_csv_data, migrate_data, run_full_migration
from backend.version import SCHEMA_VERSION


def main():
    parser = argparse.ArgumentParser(
        description="Migrate CSV data to PostgreSQL database"
    )
    parser.add_argument(
        "--drop", action="store_true", help="Drop existing tables before migration"
    )
    parser.add_argument("--geocode", action="store_true", help="Geocode postcodes")
    args = parser.parse_args()

    print("=" * 60)
    print("School Data Migration: CSV -> PostgreSQL")
    print("=" * 60)
    print(f"\nDatabase: {settings.database_url.split('@')[-1]}")
    print(f"Data directory: {settings.data_dir}")
    print(f"Target schema version: {SCHEMA_VERSION}")

    if args.drop:
        print("\nRunning full migration (drop + reimport)...")
        success = run_full_migration(geocode=args.geocode)
    else:
        print("\nCreating tables (preserving existing data)...")
        init_db()
        print("\nLoading CSV data...")
        df = load_csv_data(settings.data_dir)
        if df.empty:
            print("No data found to migrate!")
            return 1
        migrate_data(df, geocode=args.geocode)
        success = True

    if success:
        # Ensure schema_version table exists
        init_db()
        set_db_schema_version(SCHEMA_VERSION)
        print(f"\nSchema version set to {SCHEMA_VERSION}")

    return 0 if success else 1


if __name__ == "__main__":
    sys.exit(main())