"""Departments and their stations (read-only in phase 1)."""

from __future__ import annotations

from typing import Any

from fastapi import APIRouter, Depends

from .deps import Db, Principal, current_principal, get_db

router = APIRouter(prefix="/api", tags=["departments"])


@router.get("/departments")
def departments(_: Principal = Depends(current_principal), d: Db = Depends(get_db)) -> list[dict[str, Any]]:  # noqa: B008
    conn = d.conn
    rows = conn.execute(
        "SELECT code, slug, name, kind::text FROM departments WHERE active ORDER BY sort, code"
    ).fetchall()
    stations = conn.execute(
        "SELECT dept_code, name FROM stations WHERE active ORDER BY dept_code, sort, name"
    ).fetchall()
    by_dept: dict[str, list[str]] = {}
    for code, name in stations:
        by_dept.setdefault(code, []).append(name)
    return [{"code": r[0], "slug": r[1], "name": r[2], "kind": r[3], "stations": by_dept.get(r[0], [])} for r in rows]