from logging.config import fileConfig
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from alembic import context

# Add the parent directory to sys.path
import sys
import os
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))

# Import models
from app.db.session import Base
# Import all models here so they are registered with Base.metadata
# These imports are needed to register the models with SQLAlchemy
# noqa: F401 means "No Quality Assurance - ignore rule F401" (unused imports)
from app.models.user import User  # noqa: F401
from app.models.song import Song, song_playlist  # noqa: F401
from app.models.album import Album  # noqa: F401
from app.models.artist import Artist  # noqa: F401
from app.models.playlist import Playlist  # noqa: F401

# 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)

# 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"},
        render_as_batch=True,  # Important for SQLite
    )

    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:
        # Check if it's SQLite to enable batch mode
        is_sqlite = connection.dialect.name == "sqlite"
        
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            render_as_batch=is_sqlite,  # Important for SQLite
        )

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


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