"""Tenant management endpoints."""

import uuid

from fastapi import APIRouter, HTTPException, status
from sqlalchemy import select

from app.db import AsyncSessionDep
from app.models.tenant import Tenant
from app.schemas.tenant import TenantCreate, TenantResponse

router = APIRouter(prefix="/tenants", tags=["Tenants"])


# --- Helper functions (embryonic service layer) ---


async def create_tenant(db: AsyncSessionDep, tenant_in: TenantCreate) -> Tenant:
    """Create a new tenant in the database."""
    tenant = Tenant(
        name=tenant_in.name,
        domain=tenant_in.domain,
    )
    db.add(tenant)
    await db.commit()
    await db.refresh(tenant)
    return tenant


async def get_tenants(db: AsyncSessionDep) -> list[Tenant]:
    """Retrieve all tenants from the database."""
    result = await db.execute(select(Tenant).order_by(Tenant.created_at.desc()))
    return list(result.scalars().all())


async def get_tenant_by_id(db: AsyncSessionDep, tenant_id: uuid.UUID) -> Tenant | None:
    """Retrieve a tenant by ID."""
    result = await db.execute(select(Tenant).where(Tenant.id == tenant_id))
    return result.scalar_one_or_none()


# --- Route handlers (thin controllers) ---


@router.post("/", response_model=TenantResponse, status_code=status.HTTP_201_CREATED)
async def create_tenant_endpoint(
    tenant_in: TenantCreate,
    db: AsyncSessionDep,
) -> Tenant:
    """
    Create a new tenant.

    - **name**: Unique tenant name (required)
    - **domain**: Optional domain for the tenant
    """
    return await create_tenant(db, tenant_in)


@router.get("/", response_model=list[TenantResponse])
async def list_tenants_endpoint(db: AsyncSessionDep) -> list[Tenant]:
    """
    List all tenants.

    Returns a list of all registered tenants.
    """
    return await get_tenants(db)


@router.get("/{tenant_id}", response_model=TenantResponse)
async def get_tenant_endpoint(
    tenant_id: uuid.UUID,
    db: AsyncSessionDep,
) -> Tenant:
    """
    Get a tenant by ID.

    Returns the tenant with the specified UUID.
    """
    tenant = await get_tenant_by_id(db, tenant_id)
    if tenant is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Tenant {tenant_id} not found",
        )
    return tenant