"""
EmailChangeRequest model — tracks pending email-change confirmation tokens.
"""
from __future__ import annotations
from datetime import datetime
from typing import Optional

from sqlalchemy import Integer, String, DateTime, ForeignKey, func
from sqlalchemy.orm import Mapped, mapped_column

from src.apps.base.models.base import Base


class EmailChangeRequest(Base):
    """Stores pending email change requests with SHA-256 hashed tokens."""

    __tablename__ = "email_change_requests"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(
        Integer,
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    new_email: Mapped[str] = mapped_column(String(255), nullable=False)
    token_hash: Mapped[str] = mapped_column(String(64), nullable=False, unique=True, index=True)
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    confirmed_at: Mapped[Optional[datetime]] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )