from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import Boolean, DateTime, String, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database.base import Base

if TYPE_CHECKING:
    from app.auth.models import EmailVerificationToken, PasswordResetToken
    from app.chats.models import ChatMember
    from app.messages.models import Message


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    username: Mapped[str] = mapped_column(String(50), unique=True, index=True)
    email: Mapped[str] = mapped_column(String(255), unique=True, index=True)
    password_hash: Mapped[str] = mapped_column(String(255))
    avatar_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    email_verified: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    memberships: Mapped[list["ChatMember"]] = relationship(back_populates="user", cascade="all, delete-orphan")
    sent_messages: Mapped[list["Message"]] = relationship(back_populates="sender")
    email_verification_tokens: Mapped[list["EmailVerificationToken"]] = relationship(
        back_populates="user",
        cascade="all, delete-orphan",
    )
    password_reset_tokens: Mapped[list["PasswordResetToken"]] = relationship(
        back_populates="user",
        cascade="all, delete-orphan",
    )