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

# Add ./src to sys.path
BASE_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
SRC_DIR = os.path.join(BASE_DIR, "src")
if SRC_DIR not in sys.path:
    sys.path.append(SRC_DIR)

from app.db.session import Base  # noqa
from app import models  # noqa: F401

config = context.config

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

target_metadata = Base.metadata
DATABASE_URL = os.getenv("DATABASE_URL")

def run_migrations_offline() -> None:
    url = DATABASE_URL
    if not url:
        raise RuntimeError("DATABASE_URL is not set")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        compare_type=True,
    )
    with context.begin_transaction():
        context.run_migrations()

def run_migrations_online() -> None:
    url = DATABASE_URL
    if not url:
        raise RuntimeError("DATABASE_URL is not set")
    connectable = engine_from_config(
        {"sqlalchemy.url": url},
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )
    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=target_metadata, compare_type=True)
        with context.begin_transaction():
            context.run_migrations()

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