"""Tenant model."""

from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import CheckConstraint, DateTime, String, func
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base


class Tenant(Base):
    """Tenant entity — top-level organisational unit."""

    __tablename__ = "tenants"

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    slug: Mapped[str] = mapped_column(String(100), unique=True, nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    resolution_strategy: Mapped[str] = mapped_column(
        String(30), nullable=False, default="highest_wins"
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )

    __table_args__ = (
        # ⚠️ Only highest_wins strategy supported — other strategies removed as they were no-ops.
        CheckConstraint(
            "resolution_strategy IN ('highest_wins')",
            name="ck_tenant_resolution_strategy",
        ),
    )