from logging.config import fileConfig
from sqlalchemy import engine_from_config, pool
from alembic import context
import sys
import os

# Add app directory to path
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))

# Import models for autogenerate
from app.database import Base
from app import models

# Alembic Config object
config = context.config

# Interpret the config file for Python logging
fileConfig(config.config_file_name)

# Override SQLAlchemy URL from environment variable
database_url = os.getenv('DATABASE_URL')
if database_url:
    config.set_main_option('sqlalchemy.url', database_url)

# Set target_metadata for autogenerate support
target_metadata = Base.metadata

def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode."""
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode."""
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata
        )

        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()