from datetime import datetime

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

from app.db import Base


class AuthUser(Base):
    __tablename__ = "auth_users"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    username: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    force_password_change: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    # TOTP fields (Phase B, M4-T04) — nullable/false by default so existing users are unaffected
    totp_secret: Mapped[str | None] = mapped_column(String(64), nullable=True)
    totp_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)

    sessions: Mapped[list["AuthSession"]] = relationship(back_populates="user")
    recovery_codes: Mapped[list["RecoveryCode"]] = relationship(back_populates="user")


class AuthSession(Base):
    __tablename__ = "auth_sessions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("auth_users.id"), nullable=False, index=True)
    token_hash: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    csrf_token: Mapped[str] = mapped_column(String(128), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
    revoked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    user: Mapped[AuthUser] = relationship(back_populates="sessions")


class RecoveryCode(Base):
    """One-time TOTP recovery codes for AuthUser.

    ``code_hash`` stores the Argon2 hash of the plaintext code (plaintext is
    returned only at setup time and never stored).  ``used_at`` is NULL while
    the code is still valid; set to the consumption timestamp when consumed.
    """

    __tablename__ = "auth_recovery_code"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("auth_users.id"), nullable=False, index=True)
    code_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    used_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    user: Mapped[AuthUser] = relationship(back_populates="recovery_codes")