import os
from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool

from alembic import context
from letta.config import LettaConfig
from letta.orm import Base
from letta.settings import DatabaseChoice, settings

letta_config = LettaConfig.load()

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

if settings.database_engine is DatabaseChoice.POSTGRES:
    # Convert PostgreSQL URI to sync format for alembic using common utility
    from letta.database_utils import get_database_uri_for_context

    sync_pg_uri = get_database_uri_for_context(settings.letta_pg_uri, "alembic")

    config.set_main_option("sqlalchemy.url", sync_pg_uri)
    print("Using database: ", sync_pg_uri)
else:
    config.set_main_option("sqlalchemy.url", "sqlite:///" + os.path.join(letta_config.recall_storage_path, "sqlite.db"))

# 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"},
    )

    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, include_schemas=True)

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


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