from sqlalchemy import Column, String, Numeric, DateTime, Boolean, ForeignKey, Integer
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import declarative_base, relationship, sessionmaker
from datetime import datetime
import uuid

Base = declarative_base()

def generate_uuid():
    return str(uuid.uuid4())

"""Пользователи"""
class User(Base):
    __tablename__ = 'users'

    id = Column(String, primary_key=True, default=generate_uuid)
    telegram_id = Column(Integer, unique=True, nullable=False)
    username = Column(String)
    balance = Column(Numeric(10, 2), default=0.0)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    subscriptions = relationship("Subscription", back_populates="user")
    transactions = relationship("Transaction", back_populates="user")
    admins = relationship("Administrators", back_populates="user")

"""Подписки"""
class Subscription(Base):
    __tablename__ = 'subscriptions'

    id = Column(String, primary_key=True, default=generate_uuid)
    user_id = Column(String, ForeignKey('users.id'))
    vpn_server_id = Column(String)
    plan = Column(String)
    expiry_date = Column(DateTime)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    user = relationship("User", back_populates="subscriptions")

"""Транзакции"""
class Transaction(Base):
    __tablename__ = 'transactions'

    id = Column(String, primary_key=True, default=generate_uuid)
    user_id = Column(String, ForeignKey('users.id'))
    amount = Column(Numeric(10, 2))
    transaction_type = Column(String)
    created_at = Column(DateTime, default=datetime.utcnow)

    user = relationship("User", back_populates="transactions")

"""Администраторы"""
class Administrators(Base):
    __tablename__ = 'admins'

    id = Column(String, primary_key=True, default=generate_uuid)
    user_id = Column(String, ForeignKey('users.id'))
    
    user = relationship("User", back_populates="admins")