import os
from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool

from alembic import context

config = context.config

if config.config_file_name is not None:
    fileConfig(config.config_file_name)

from app.models.base import Base
import app.models  # noqa: F401 — registers all models with Base.metadata

target_metadata = Base.metadata


def get_url() -> str:
    return (
        f"mysql+pymysql://{os.environ['MYSQL_USER']}:{os.environ['MYSQL_PASSWORD']}"
        f"@{os.environ['MYSQL_HOST']}:{os.environ.get('MYSQL_PORT', 3306)}"
        f"/{os.environ['MYSQL_DATABASE']}"
    )


def run_migrations_offline() -> None:
    context.configure(
        url=get_url(),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    config.set_main_option("sqlalchemy.url", get_url())
    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()