"""管理员服务"""
from datetime import datetime
from app import db
from app.models import Admin


class AdminService:
    """管理员业务逻辑"""
    
    @staticmethod
    def authenticate(username, password):
        """验证管理员登录"""
        admin = Admin.query.filter_by(username=username).first()
        if admin and admin.is_active and admin.check_password(password):
            # 更新最后登录时间
            admin.last_login = datetime.utcnow()
            db.session.commit()
            return admin
        return None
    
    @staticmethod
    def get_by_id(admin_id):
        """通过ID获取管理员"""
        return Admin.query.get(admin_id)
    
    @staticmethod
    def get_by_username(username):
        """通过用户名获取管理员"""
        return Admin.query.filter_by(username=username).first()
    
    @staticmethod
    def create(username, password, email=None):
        """创建管理员"""
        admin = Admin(username=username, email=email)
        admin.set_password(password)
        db.session.add(admin)
        db.session.commit()
        return admin
    
    @staticmethod
    def update_password(admin_id, old_password, new_password):
        """更新密码"""
        admin = Admin.query.get(admin_id)
        if admin and admin.check_password(old_password):
            admin.set_password(new_password)
            db.session.commit()
            return True
        return False