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

from sqlalchemy import engine_from_config, pool
from alembic import context

_backend = Path(__file__).resolve().parents[1]
if str(_backend) not in sys.path:
    sys.path.insert(0, str(_backend))

from app.database import Base
import app.models  # noqa: F401 — register all models on Base.metadata

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

target_metadata = Base.metadata


def get_sync_url() -> str:
    url = os.environ.get("DATABASE_URL", "")
    if not url:
        url = config.get_main_option("sqlalchemy.url", "")
    if "+asyncpg" in url:
        url = url.replace("postgresql+asyncpg", "postgresql", 1)
    return url


def run_migrations_offline() -> None:
    url = get_sync_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:
    cfg = config.get_section(config.config_ini_section) or {}
    cfg["sqlalchemy.url"] = get_sync_url()
    connectable = engine_from_config(
        cfg,
        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()