import sys
import os
from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool
from sqlalchemy.ext.asyncio import async_engine_from_config

from alembic import context

# Add the backend directory to the Python path
sys.path.insert(0, '/opt/audiOhm/backend')

# Load environment variables
from dotenv import load_dotenv
load_dotenv()

# Import settings and models
from app.core.config import settings
from app.core.database import Base
from app.models import (  # noqa: F401
    album,
    artist,
    liked_track,
    listening_history,
    playlist,
    playlist_track,
    track,
    user,
)

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

# Override sqlalchemy.url with the value from settings
# Convert async URL to sync URL for Alembic
database_url = settings.DATABASE_URL.replace("postgresql+asyncpg://", "postgresql://")
config.set_main_option("sqlalchemy.url", database_url)

# 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)

# add your model's MetaData object here
# for 'autogenerate' support
target_metadata = Base.metadata

# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.


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()


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