"""Sequence model — document numbering / Nummernkreise."""

from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import DateTime, Index, Integer, String
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class Sequence(Base, TenantMixin):
    """Sequence entity for document numbering (e.g. invoice RE-2026-0001)."""

    __tablename__ = "sequences"
    __table_args__ = (
        Index("ix_sequences_tenant_name", "tenant_id", "name"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    prefix: Mapped[str] = mapped_column(String(20), nullable=False, default="")
    next_number: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
    padding: Mapped[int] = mapped_column(Integer, nullable=False, default=4)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)