import os
from logging.config import fileConfig
from pathlib import Path

from alembic import context
from sqlalchemy import engine_from_config, pool

# Import our models
from cleveragents.infrastructure.database.models import Base

# 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.
# NOTE: disable_existing_loggers=False prevents fileConfig from disabling
# application loggers that were created before this point, which causes
# test failures when log capture handlers are attached to those loggers.
if config.config_file_name is not None:
    fileConfig(config.config_file_name, disable_existing_loggers=False)

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

# Override the database URL from environment or use default
# This allows flexible configuration based on deployment
# Default matches Settings.database_url: ~/.cleveragents/cleveragents.db
database_url = os.getenv(
    "CLEVERAGENTS_DATABASE_URL",
    f"sqlite:///{Path.home() / '.cleveragents' / 'cleveragents.db'}",
)
config.set_main_option("sqlalchemy.url", database_url)

# 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.

    """
    # Check if a connection/engine is already provided (e.g., for in-memory SQLite)
    # This allows tests to reuse the same in-memory database
    connectable = config.attributes.get("connection", None)

    if connectable is None:
        # Create a new engine from config
        connectable = engine_from_config(
            config.get_section(config.config_ini_section, {}),
            prefix="sqlalchemy.",
            poolclass=pool.NullPool,
        )
        # We created the engine, so we should manage the connection lifecycle
        with connectable.connect() as connection:
            context.configure(connection=connection, target_metadata=target_metadata)

            with context.begin_transaction():
                context.run_migrations()
    else:
        # Connection was provided externally, use it but don't close it
        # (the caller is responsible for cleanup)
        context.configure(connection=connectable, target_metadata=target_metadata)

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


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