"""Note model: free-text notes attached polymorphically to accounts/contacts/deals."""

from __future__ import annotations

from enum import Enum
from typing import TYPE_CHECKING

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

from app.models.base import Base, OrgScopedMixin, SoftDeleteMixin, TimestampMixin

if TYPE_CHECKING:
    from app.models.user import User


class NoteParentType(str, Enum):
    """Polymorphic parent type for notes (no DB FK, validated in service layer)."""

    account = "account"
    contact = "contact"
    deal = "deal"


class Note(Base, TimestampMixin, SoftDeleteMixin, OrgScopedMixin):
    __tablename__ = "notes"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    body: Mapped[str] = mapped_column(Text, nullable=False)
    author_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False, index=True)
    parent_type: Mapped[NoteParentType] = mapped_column(String(32), nullable=False, index=True)
    # parent_id is intentionally NOT a DB FK because of polymorphic parent.
    # Service layer (note_service.create_note) validates existence.
    parent_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)

    author: Mapped[User] = relationship("User", foreign_keys=[author_id], lazy="joined")

    def __repr__(self) -> str:
        return f"<Note id={self.id} parent={self.parent_type}:{self.parent_id}>"


__all__ = ["Note", "NoteParentType"]