"""
Alembic 环境配置
"""
from logging.config import fileConfig
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from alembic import context
import os
import sys

# 添加项目路径
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from app.extensions import db
from app.config import Config

# Alembic Config 对象
config = context.config

# 配置日志
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# 模型元数据
target_metadata = db.Model.metadata

def get_url():
    """获取数据库 URL"""
    return os.getenv('DATABASE_URL', 'sqlite:///pit_router.db')


def run_migrations_offline() -> None:
    """离线迁移"""
    url = get_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:
    """在线迁移"""
    configuration = config.get_section(config.config_ini_section)
    configuration["sqlalchemy.url"] = get_url()
    connectable = engine_from_config(
        configuration,
        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()