#!/usr/bin/env python3
"""
Data migration script

Migrates existing data from code/JSON files to PostgreSQL database:
1. CELESTIAL_BODIES dict → celestial_bodies table
2. Frontend JSON files → static_data table

Usage:
    python scripts/migrate_data.py [--force | --skip-existing]

Options:
    --force          Overwrite existing data without prompting
    --skip-existing  Skip migration if data already exists
"""
import asyncio
import sys
from pathlib import Path
import json
import argparse

sys.path.insert(0, str(Path(__file__).parent.parent))

from app.database import AsyncSessionLocal
from app.models.celestial import CELESTIAL_BODIES
from app.models.db import CelestialBody, StaticData
from sqlalchemy import select
import logging

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


async def migrate_celestial_bodies(force: bool = False, skip_existing: bool = False):
    """Migrate CELESTIAL_BODIES dict to database"""
    logger.info("=" * 60)
    logger.info("Migrating celestial bodies...")
    logger.info("=" * 60)

    async with AsyncSessionLocal() as session:
        # Check if data already exists
        result = await session.execute(select(CelestialBody))
        existing_count = len(result.scalars().all())

        if existing_count > 0:
            logger.warning(f"Found {existing_count} existing celestial bodies in database")

            if skip_existing:
                logger.info("Skipping celestial bodies migration (--skip-existing)")
                return

            if not force:
                response = input("Do you want to overwrite? (yes/no): ")
                if response.lower() not in ['yes', 'y']:
                    logger.info("Skipping celestial bodies migration")
                    return
            else:
                logger.info("Overwriting existing data (--force)")

            # Delete existing data
            from sqlalchemy import text
            await session.execute(text("DELETE FROM celestial_bodies"))
            logger.info(f"Deleted {existing_count} existing records")

        # Insert new data
        count = 0
        for body_id, info in CELESTIAL_BODIES.items():
            body = CelestialBody(
                id=body_id,
                name=info["name"],
                name_zh=info.get("name_zh"),
                type=info["type"],
                description=info.get("description"),
                extra_data={
                    "launch_date": info.get("launch_date"),
                    "status": info.get("status"),
                } if "launch_date" in info or "status" in info else None
            )
            session.add(body)
            count += 1

        await session.commit()
        logger.info(f"✓ Migrated {count} celestial bodies")


async def migrate_static_data(force: bool = False, skip_existing: bool = False):
    """Migrate frontend JSON files to database"""
    logger.info("=" * 60)
    logger.info("Migrating static data from JSON files...")
    logger.info("=" * 60)

    # Define JSON files to migrate
    frontend_data_dir = Path(__file__).parent.parent.parent / "frontend" / "public" / "data"
    json_files = {
        "nearby-stars.json": "star",
        "constellations.json": "constellation",
        "galaxies.json": "galaxy",
    }

    async with AsyncSessionLocal() as session:
        for filename, category in json_files.items():
            file_path = frontend_data_dir / filename
            if not file_path.exists():
                logger.warning(f"File not found: {file_path}")
                continue

            # Load JSON data
            with open(file_path, 'r', encoding='utf-8') as f:
                data_list = json.load(f)

            # Check if category data already exists
            result = await session.execute(
                select(StaticData).where(StaticData.category == category)
            )
            existing = result.scalars().all()

            if existing:
                logger.warning(f"Found {len(existing)} existing {category} records")

                if skip_existing:
                    logger.info(f"Skipping {category} migration (--skip-existing)")
                    continue

                if not force:
                    response = input(f"Overwrite {category} data? (yes/no): ")
                    if response.lower() not in ['yes', 'y']:
                        logger.info(f"Skipping {category} migration")
                        continue
                else:
                    logger.info(f"Overwriting {category} data (--force)")

                # Delete existing
                for record in existing:
                    await session.delete(record)

            # Insert new data
            count = 0
            for item in data_list:
                static_item = StaticData(
                    category=category,
                    name=item.get("name", "Unknown"),
                    name_zh=item.get("name_zh"),
                    data=item
                )
                session.add(static_item)
                count += 1

            await session.commit()
            logger.info(f"✓ Migrated {count} {category} records")


async def main():
    """Run all migrations"""
    # Parse command line arguments
    parser = argparse.ArgumentParser(description='Migrate data to PostgreSQL database')
    group = parser.add_mutually_exclusive_group()
    group.add_argument('--force', action='store_true', help='Overwrite existing data without prompting')
    group.add_argument('--skip-existing', action='store_true', help='Skip migration if data already exists')
    args = parser.parse_args()

    logger.info("\n" + "=" * 60)
    logger.info("Cosmo Data Migration")
    logger.info("=" * 60 + "\n")

    try:
        # Migrate celestial bodies
        await migrate_celestial_bodies(force=args.force, skip_existing=args.skip_existing)

        # Migrate static data
        await migrate_static_data(force=args.force, skip_existing=args.skip_existing)

        logger.info("\n" + "=" * 60)
        logger.info("✓ Migration completed successfully!")
        logger.info("=" * 60)

    except Exception as e:
        logger.error(f"\n✗ Migration failed: {e}")
        import traceback
        traceback.print_exc()
        sys.exit(1)


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