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

from config.database.connections import DatabaseManager, Base


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

database = DatabaseManager()
dbname = os.getenv("--connection", None)

if dbname is None:
    sys.exit("Debe especificar la variable --connection.")

if dbname == "global":
    url = database.get_sqlalchemy_url('global')
else:
    database.create_connection(dbname)
    url = database.get_sqlalchemy_url('client')

if url is None:
    sys.exit(f"No se pudo obtener la conexión para '{dbname}'.")

config.set_main_option(
    "sqlalchemy.url",
    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
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
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"},
        include_schemas=True,
    )
    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,
            version_table='migrations_{{ name }}',
            include_schemas=True,
        )
        with context.begin_transaction():
            context.run_migrations()
if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()
