from __future__ import annotations

from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool

from alembic import context

from govcrawler.settings import get_settings
from govcrawler.models import Base

config = context.config

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

# 注入 db_url（从 .env / 环境变量读取，不硬编码）
# Escape % for configparser interpolation so URL-encoded passwords like
# mysql+pymysql://user:pa%21ss@host/db survive ini parsing.
config.set_main_option("sqlalchemy.url", get_settings().db_url.replace("%", "%%"))

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    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:
    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,
            compare_type=True,
            compare_server_default=True,
        )
        with context.begin_transaction():
            context.run_migrations()


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