import os
from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool

from alembic import context

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

# Resolve DATABASE_URL from environment (MYDEEPAGENT_DATABASE_URL takes
# precedence, then DATABASE_URL, then the v0.2 Postgres default).
# Alembic uses synchronous SQLAlchemy, so async driver prefixes are stripped:
#   postgresql+asyncpg:// → postgresql://
#   postgresql+psycopg://  → postgresql://   (kept for psycopg sync default)
#   sqlite+aiosqlite://    → sqlite://       (legacy / test override)
_raw_url: str = (
    os.environ.get("MYDEEPAGENT_DATABASE_URL")
    or os.environ.get("DATABASE_URL")
    or "postgresql://devflow:devflow@localhost:55432/mydeepagent"
)
# Alembic always runs synchronously. Convert async drivers to a sync equivalent
# that we know is installed: psycopg (v3) for Postgres, the stdlib sqlite3 for
# SQLite. Do NOT fall through to a bare `postgresql://` URL because SQLAlchemy
# would then try to import psycopg2 (which is not in our deps).
_sync_url: str = _raw_url.replace("postgresql+asyncpg://", "postgresql+psycopg://").replace(
    "sqlite+aiosqlite://", "sqlite://"
)
# Allow a bare `postgresql://` URL too — it has to be promoted to psycopg.
if _sync_url.startswith("postgresql://"):
    _sync_url = "postgresql+psycopg://" + _sync_url[len("postgresql://") :]
config.set_main_option("sqlalchemy.url", _sync_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 my_deepagent.persistence.models import Base  # noqa: E402

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)

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


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