from datetime import UTC, datetime

from flask_login import UserMixin

from sqlalchemy import Boolean, DateTime, Integer, String, Text

from sqlalchemy.orm import Mapped, mapped_column

from werkzeug.security import check_password_hash, generate_password_hash

from python_chat.database import Base, db

class User(UserMixin, Base):

"""User model for authentication and session management."""

__tablename__ = "users"

id: Mapped[int] = mapped_column(Integer, primary_key=True)

username: Mapped[str] = mapped_column(String(64), unique=True, nullable=False)

password_hash: Mapped[str] = mapped_column(String(255), nullable=False)

is_admin: Mapped[bool] = mapped_column(Boolean, default=False)

is_blocked: Mapped[bool] = mapped_column(Boolean, default=False)

blocked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

blocked_reason: Mapped[str | None] = mapped_column(Text, nullable=True)

created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

chats = db.relationship("ChatMember", back_populates="user", cascade="all, delete-orphan")

messages = db.relationship("ChatMessage", back_populates="user", passive_deletes=True)

def set_password(self, password) -> None:

"""Hash and set the user password."""

self.password_hash = generate_password_hash(password)

def check_password(self, password) -> bool:

"""Verify the user password against stored hash."""

return check_password_hash(self.password_hash, password)

def block(self, reason=None) -> None:

"""Block the user with an optional reason."""

self.is_blocked = True

self.blocked_at = datetime.now(UTC)

self.blocked_reason = reason

def unblock(self) -> None:

"""Unblock the user."""

self.is_blocked = False

self.blocked_at = None

self.blocked_reason = None

def __repr__(self) -> str:

return f"<User {self.username}>"