"""
Tenants Domain Models

The tenant registry (core-api T-8 / workspace D-73): every Book and Scribe
`owner_tenant` column carries a foreign key to `tenants.id` (migration 007),
and `TenantsService.require_tenant` is the one place a caller's tenant is
checked known, active, and — for an Office caller — granted to the calling
consumer. SQLAlchemy 2.0 Mapped/mapped_column style, timestamptz, following
src/domains/book/models.py.

`TenantConsumer.default_address` (migration 008, core-api T-11) is each
grant's fallback address for a caller that names none and holds no session
binding — claude.ai's connector keeps no MCP session between tool calls, so
the Office needs this to answer without one. The composite FK keeps it
honest: a default always names a real address in the same tenant.
"""
from datetime import datetime
from typing import Optional

from sqlalchemy import (
    CheckConstraint,
    DateTime,
    ForeignKey,
    ForeignKeyConstraint,
    String,
    Text,
    func,
)
from sqlalchemy.orm import Mapped, mapped_column

from src.shared.database import Base

TENANT_KINDS = ("household", "person", "test")
TENANT_STATUSES = ("active", "suspended")

# The slug shape a tenant id carries, identical to
# src/domains/auth/callers.py's `_TENANT_RE` (tatlock's own tenant ids carry
# underscores, e.g. `llm_tester`) — not imported from there because that
# module's constants are private to it, following
# src/domains/scribe/models.py's same note about ADDRESS_NAME_PATTERN.
# Asserted equal in tests/test_tenants.py.
TENANT_ID_PATTERN = r"^[a-z0-9_][a-z0-9_.-]{0,62}$"


class Tenant(Base):
    """A tenant: tatlock's own per-household/person/test namespace."""

    __tablename__ = "tenants"
    __table_args__ = (
        CheckConstraint("kind IN ('household', 'person', 'test')", name="ck_tenants_kind"),
        CheckConstraint("status IN ('active', 'suspended')", name="ck_tenants_status"),
    )

    id: Mapped[str] = mapped_column(String(63), primary_key=True)
    display_name: Mapped[str] = mapped_column(Text, nullable=False)
    kind: Mapped[str] = mapped_column(String(20), nullable=False)
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="active")
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    def __repr__(self) -> str:
        return f"<Tenant {self.id} kind={self.kind} status={self.status}>"


class TenantConsumer(Base):
    """A grant: consumer `consumer` may act in tenant `tenant_id`, with an
    optional default address (migration 008, core-api T-11) — the composite
    FK below means a non-null default always names a real
    `scribe_addresses` row in this same tenant."""

    __tablename__ = "tenant_consumers"
    __table_args__ = (
        ForeignKeyConstraint(
            ["tenant_id", "default_address"],
            ["scribe_addresses.owner_tenant", "scribe_addresses.name"],
            name="fk_tenant_consumers_default_address",
        ),
    )

    tenant_id: Mapped[str] = mapped_column(
        String(63), ForeignKey("tenants.id"), primary_key=True
    )
    consumer: Mapped[str] = mapped_column(String(63), primary_key=True)
    # FK to scribe_addresses (owner_tenant, name) added by migration 008.
    default_address: Mapped[Optional[str]] = mapped_column(String(63), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )

    def __repr__(self) -> str:
        return f"<TenantConsumer {self.tenant_id}/{self.consumer}>"