from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from app.config import DATABASE_URL
import os

# MySQL 連線引擎設定
engine = create_engine(
    DATABASE_URL,
    pool_size=10,
    max_overflow=20,
    pool_pre_ping=True,
    pool_recycle=3600,
    echo=False
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

# Import models to register them
from app.models.user import User, UserRole
from app.models.dit import DitRecord
from app.models.sample import SampleRecord
from app.models.order import OrderRecord
from app.models.match import MatchResult, ReviewLog

def init_db():
    """初始化資料庫並建立預設管理員"""
    from app.utils.security import get_password_hash

    # 建立所有資料表
    Base.metadata.create_all(bind=engine)

    # 建立預設管理員帳號
    db = SessionLocal()
    try:
        admin_email = os.getenv("ADMIN_EMAIL", "admin@example.com")
        admin_password = os.getenv("ADMIN_PASSWORD", "admin123")

        existing = db.query(User).filter(User.email == admin_email).first()
        if not existing:
            admin = User(
                email=admin_email,
                password_hash=get_password_hash(admin_password),
                display_name="Administrator",
                language="zh-TW",
                role=UserRole.admin
            )
            db.add(admin)
            db.commit()
            print(f"[Init] Admin user created: {admin_email}")
        else:
            print(f"[Init] Admin user exists: {admin_email}")
    except Exception as e:
        print(f"[Init] Error creating admin: {e}")
        db.rollback()
    finally:
        db.close()