import type { BottomNavItem } from "@/components/navigation/bottom-nav";

/**
 * Single source of truth for the merged staff/owner/super-admin bottom nav
 * and desktop sidebar (see docs/implementation-plan.md and the Phase 11
 * "merged navigation" brief). Owner is a permission on a staff account, not
 * a separate app — Owner and SuperAdmin nav reuse the exact same personal
 * routes (`/staff/current`, `/staff/clients`, `/staff/settings`) a barber
 * uses, rather than duplicating them under `/owner`. This is what lets
 * owners reach barber tools and business tools from one menu with zero new
 * routes.
 *
 * A Super Administrator has no StaffProfile by construction (see
 * isSuperAdmin/getActingBusinessContext) — they get no "Now" tab, since
 * there is no personal schedule to show, per the brief's explicit "do not
 * fabricate a personal barber schedule for the Super Administrator".
 */
export type NavRole = "staff" | "owner" | "superadmin";

const CALENDAR: BottomNavItem = { href: "/staff", label: "Calendar", icon: "calendar-days" };
const OWNER_CALENDAR: BottomNavItem = { href: "/owner/calendar", label: "Calendar", icon: "calendar-days" };
const NOW: BottomNavItem = { href: "/staff/current", label: "Now", icon: "scissors" };
const CLIENTS: BottomNavItem = { href: "/staff/clients", label: "Clients", icon: "users" };
const MANAGE: BottomNavItem = { href: "/owner", label: "Manage", icon: "briefcase" };
const SETTINGS: BottomNavItem = { href: "/staff/settings", label: "Settings", icon: "settings" };

const NAV_ITEMS_BY_ROLE: Record<NavRole, BottomNavItem[]> = {
  staff: [CALENDAR, NOW, CLIENTS, SETTINGS],
  owner: [OWNER_CALENDAR, NOW, CLIENTS, MANAGE, SETTINGS],
  superadmin: [OWNER_CALENDAR, CLIENTS, MANAGE, SETTINGS],
};

export function getNavItems(role: NavRole): BottomNavItem[] {
  return NAV_ITEMS_BY_ROLE[role];
}

/**
 * Longest-matching-href wins, rather than "every item whose href is a
 * pathname prefix" (the previous per-component logic) — that scheme let
 * `/staff/current` mark both "Calendar" (href `/staff`) and "Now" active at
 * once, since `/staff/current` also starts with `/staff`. Sorting by href
 * length and taking the first match makes only the most specific item win,
 * which is what makes nested routes (e.g. `/owner/settings/loyalty`,
 * `/staff/clients/[id]`) activate exactly one, correct primary tab.
 */
export function resolveActiveHref(pathname: string, items: BottomNavItem[]): string | null {
  const matches = items.filter((item) => pathname === item.href || pathname.startsWith(`${item.href}/`));
  if (matches.length === 0) return null;
  return matches.reduce((longest, item) => (item.href.length > longest.href.length ? item : longest)).href;
}