"""
GraphoLab Backend — User and Organization ORM models.
"""

from __future__ import annotations

import enum
from datetime import datetime

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

from backend.database import Base


class Role(str, enum.Enum):
    admin = "admin"
    examiner = "examiner"   # perito — full read/write on own projects
    viewer = "viewer"       # sola lettura


class Organization(Base):
    __tablename__ = "organizations"

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    name: Mapped[str] = mapped_column(String(128), unique=True, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    users: Mapped[list[User]] = relationship("User", back_populates="organization")


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    email: Mapped[str] = mapped_column(String(256), unique=True, index=True, nullable=False)
    full_name: Mapped[str] = mapped_column(String(256), nullable=False)
    hashed_password: Mapped[str] = mapped_column(String(256), nullable=False)
    role: Mapped[Role] = mapped_column(Enum(Role), default=Role.examiner, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    organization_id: Mapped[int | None] = mapped_column(
        ForeignKey("organizations.id", ondelete="SET NULL"), nullable=True
    )
    organization: Mapped[Organization | None] = relationship(
        "Organization", back_populates="users"
    )

    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )

    projects: Mapped[list] = relationship("Project", back_populates="owner")
    settings: Mapped["UserSettings | None"] = relationship(  # type: ignore[name-defined]
        "UserSettings", back_populates="user", uselist=False, cascade="all, delete-orphan"
    )