from sqlalchemy import Column, Integer, String, DateTime, Text, ForeignKey, CheckConstraint, Boolean, Enum
from sqlalchemy.orm import declarative_base, relationship
from datetime import datetime
import enum

Base = declarative_base()

class UserRole(str, enum.Enum):
    super_admin = "super_admin"
    user = "user"

class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    username = Column(String, unique=True, index=True, nullable=False)
    email = Column(String, unique=True, index=True, nullable=False)
    hashed_password = Column(String, nullable=False)
    role = Column(Enum(UserRole), default=UserRole.user, nullable=False)
    is_active = Column(Boolean, default=True, nullable=False)
    full_name = Column(String, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    refresh_tokens = relationship("RefreshToken", back_populates="user", cascade="all, delete-orphan")


class RefreshToken(Base):
    __tablename__ = "refresh_tokens"

    id = Column(Integer, primary_key=True, index=True)
    token = Column(String, unique=True, index=True, nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    expires_at = Column(DateTime, nullable=False)
    revoked = Column(Boolean, default=False, nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)

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

class ChatHistory(Base):
    __tablename__ = "chat_history"

    id = Column(Integer, primary_key=True, index=True)
    session_id = Column(String, index=True, nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
    role = Column(String, nullable=False)
    content = Column(Text, nullable=False)
    retrieved_doc_ids = Column(Text, nullable=True)
    pinned = Column(Boolean, default=False, nullable=False)
    timestamp = Column(DateTime, default=datetime.utcnow)

class Feedback(Base):
    __tablename__ = "feedback"

    id = Column(Integer, primary_key=True, index=True)
    session_id = Column(String, index=True, nullable=False)
    message_id = Column(Integer, nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
    rating = Column(Integer, CheckConstraint('rating IN (1, -1)'))
    comment = Column(Text, nullable=True)
    timestamp = Column(DateTime, default=datetime.utcnow)