import asyncio
import re
from logging.config import fileConfig
from sqlalchemy import pool
from sqlalchemy.ext.asyncio import create_async_engine
from alembic import context

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

import sys, os
sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))

# Load .env before importing settings
from dotenv import load_dotenv
load_dotenv(os.path.join(os.path.dirname(__file__), "..", ".env"))

from src.database import Base
from src.models import JobDescription, Candidate, MatchResult, Session
from src.config import get_settings

target_metadata = Base.metadata


def _make_async_url(url: str) -> str:
    url = re.sub(r"^postgresql:", "postgresql+asyncpg:", url)
    url = re.sub(r"[?&]channel_binding=require", "", url)
    url = re.sub(r"[?&]sslmode=[^&]*", "", url)
    url = re.sub(r"[?&]connect_timeout=[^&]*", "", url)
    # clean trailing ? or &
    url = re.sub(r"[?&]$", "", url)
    return url


def run_migrations_offline() -> None:
    settings = get_settings()
    context.configure(
        url=_make_async_url(settings.database_url),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def do_run_migrations(connection):
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations() -> None:
    settings = get_settings()
    from src.database import _make_async_url
    db_url, connect_args = _make_async_url(settings.database_url)
    connectable = create_async_engine(db_url, poolclass=pool.NullPool, connect_args=connect_args)
    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)
    await connectable.dispose()


def run_migrations_online() -> None:
    asyncio.run(run_async_migrations())


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