from logging.config import fileConfig
import asyncio
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from src.config.database import engine  # Import the async engine from your database configuration  
from alembic import context

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

import sys
import os
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

from src.models.base import Base  # your declarative base
from src.models import prediction  # import your actual model

target_metadata = Base.metadata



def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode.
 
    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.
 
    Calls to context.execute() here emit the given string to the
    script output.
 
    """
    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.
 
#     In this scenario we need to create an Engine
#     and associate a connection with the context.
 
#     """
#     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()
 
 
#Modified to support Async approach
def run_migrations_online():
    """Run migrations in 'online' mode with async engine."""
    connectable = engine
 
    async def do_run_migrations():
        async with connectable.connect() as connection:
            await connection.run_sync(run_migrations)
 
    def run_migrations(connection):
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
        )
 
        with context.begin_transaction():
            context.run_migrations()
 
    asyncio.run(do_run_migrations())
 
 
if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()