"""ORM model for invoice / proforma attachments (table `quote_attachments`).

File bytes live in MinIO object storage; this table is the metadata record
(``object_key`` points at the object inside the PROCUREMENT_MINIO_BUCKET).
Multiple attachments per quote per kind are allowed (multi-file contract,
no unique constraint on (quote_id, kind)).
"""
import uuid
from datetime import datetime

from sqlalchemy import BigInteger, CheckConstraint, DateTime, ForeignKey, Text, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base
from app.models.catalog import _timestamptz, _uuid_pk
from app.utils.serialization import to_iso


class QuoteAttachment(Base):
    __tablename__ = "quote_attachments"
    __mapper_args__ = {"eager_defaults": True}  # fetch onupdate=func.now() via RETURNING
    __table_args__ = (
        CheckConstraint("kind IN ('invoice', 'proforma')", name="ck_quote_attachments_kind"),
    )

    id: Mapped[uuid.UUID] = _uuid_pk()
    quote_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("quotes.id", ondelete="CASCADE"), nullable=False)
    kind: Mapped[str] = mapped_column(Text, nullable=False)  # "invoice" | "proforma"
    file_name: Mapped[str] = mapped_column(Text, nullable=False)
    mime_type: Mapped[str] = mapped_column(Text, nullable=False)
    size_bytes: Mapped[int] = mapped_column(BigInteger, nullable=False)
    object_key: Mapped[str] = mapped_column(Text, nullable=False)  # MinIO key inside the bucket
    uploaded_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    created_at: Mapped[datetime] = _timestamptz()
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )

    quote: Mapped["Quote"] = relationship(lazy="raise")

    def to_dict(self) -> dict:
        return {
            "id": str(self.id),
            "quote_id": str(self.quote_id),
            "kind": self.kind,
            "file_name": self.file_name,
            "mime_type": self.mime_type,
            "size_bytes": self.size_bytes,
            "uploaded_at": to_iso(self.uploaded_at),
        }