import {
  Activity,
  BarChart3,
  Boxes,
  CalendarDays,
  Crown,
  Database,
  Droplet,
  Factory,
  FlaskConical,
  History,
  Layers,
  LayoutDashboard,
  Lightbulb,
  ListTodo,
  type LucideIcon,
  MapPin,
  Package,
  Scissors,
  Search,
  ShieldCheck,
  ShoppingBag,
  Snowflake,
  Users,
  Warehouse,
  Wrench,
  Zap,
} from "lucide-react";
import type { AuthUser } from "@/lib/auth/auth-context";

/**
 * The single source of truth for every area of the app: the desktop sidebar,
 * the phone bottom nav and its „Mehr" sheet all read from here, so an area
 * can never be reachable on one screen size and missing on another.
 */
export interface NavItem {
  label: string;
  /** Short name for the cramped bottom nav. */
  shortLabel?: string;
  href: string;
  icon: LucideIcon;
  // Any one of these grants visibility - used for hub pages that fold
  // together several previously-separate settings pages, each gated by its
  // own permission.
  permission?: string | string[];
  /** A number shown next to the label; the data comes from the matching hook. */
  counter?: "suggestions";
}

export interface NavGroup {
  label: string | null;
  items: NavItem[];
}

export const NAV_GROUPS: NavGroup[] = [
  {
    label: null,
    items: [
      {
        label: "Dashboard",
        shortLabel: "Start",
        href: "/dashboard",
        icon: LayoutDashboard,
      },
      { label: "Suche", href: "/search", icon: Search },
    ],
  },
  {
    label: "Betrieb",
    items: [
      { label: "Bienenstände", href: "/apiaries", icon: MapPin },
      { label: "Völker", href: "/colonies", icon: Layers },
      { label: "Königinnen", href: "/queens", icon: Crown },
      {
        label: "Prüfbereitschaft",
        href: "/compliance",
        icon: ShieldCheck,
        permission: "compliance:read",
      },
      {
        label: "Überwinterung",
        href: "/winter",
        icon: Snowflake,
        permission: "winter-checks:read",
      },
    ],
  },
  {
    label: "Arbeit",
    items: [
      { label: "Aufgaben", href: "/tasks", icon: ListTodo },
      {
        label: "Vorschläge",
        href: "/suggestions",
        icon: Lightbulb,
        permission: "tasks:read",
        counter: "suggestions",
      },
      { label: "Kalender", href: "/calendar", icon: CalendarDays },
    ],
  },
  {
    label: "Ernte & Lager",
    items: [
      { label: "Ernten", href: "/harvests", icon: Scissors },
      { label: "Schleuderungen", href: "/extractions", icon: FlaskConical },
      { label: "Honigchargen", href: "/honey-batches", icon: Droplet },
      { label: "Abfüllungen", href: "/bottling", icon: Package },
      {
        label: "Rohstoffe",
        href: "/raw-materials",
        icon: Boxes,
        permission: "raw-material:read",
      },
      {
        label: "Herstellungschargen",
        href: "/production-batches",
        icon: Factory,
        permission: "production-batch:read",
      },
      { label: "Produkte", href: "/products", icon: ShoppingBag },
      { label: "Lager", href: "/storage", icon: Warehouse },
      { label: "Inventar", href: "/equipment", icon: Wrench },
    ],
  },
  {
    label: "Auswertung",
    items: [{ label: "Statistik", href: "/statistics", icon: BarChart3 }],
  },
];

export const ADMIN_GROUP: NavGroup = {
  label: "Verwaltung",
  items: [
    {
      label: "Benutzer & Rollen",
      href: "/settings/users-roles",
      icon: Users,
      permission: ["users:read", "roles:read"],
    },
    {
      label: "Automatisierung",
      href: "/settings/automation",
      icon: Zap,
      permission: [
        "webhooks:read",
        "automation:read",
        "task-templates:read",
        "label-templates:read",
        "site-settings:read",
        "calendar:configure",
        "api-keys:manage",
      ],
    },
    {
      label: "Backup",
      href: "/settings/backup",
      icon: Database,
      permission: ["backup:export", "backup:import", "import:execute"],
    },
    {
      label: "Audit-Log",
      href: "/settings/audit-log",
      icon: History,
      permission: "audit:read",
    },
    {
      label: "System",
      href: "/settings/system",
      icon: Activity,
      permission: "system:read",
    },
  ],
};

/** The four favourites on the phone; everything else sits behind „Mehr". */
export const BOTTOM_NAV_HREFS = [
  "/dashboard",
  "/colonies",
  "/tasks",
  "/search",
] as const;

function isVisible(
  user: Pick<AuthUser, "permissions">,
  permission: NavItem["permission"],
): boolean {
  if (!permission) {
    return true;
  }
  const required = Array.isArray(permission) ? permission : [permission];
  return required.some((key) => user.permissions.includes(key));
}

/** All groups the user may see, without empty ones; admin group last. */
export function visibleNavGroups(user: Pick<AuthUser, "permissions">): NavGroup[] {
  return [...NAV_GROUPS, ADMIN_GROUP]
    .map((group) => ({
      ...group,
      items: group.items.filter((item) => isVisible(user, item.permission)),
    }))
    .filter((group) => group.items.length > 0);
}

/** The bottom nav entries, resolved from the config in their fixed order. */
export function bottomNavItems(): NavItem[] {
  const all = NAV_GROUPS.flatMap((group) => group.items);
  return BOTTOM_NAV_HREFS.flatMap((href) => all.filter((item) => item.href === href));
}

/**
 * Whether a nav entry is the current area. Matches on a path boundary, so
 * `/queens` does not light up for `/queens-archive`.
 */
export function isNavActive(pathname: string, href: string): boolean {
  return pathname === href || pathname.startsWith(`${href}/`);
}