import {
  BarChart3,
  Bot,
  BookOpen,
  Building2,
  FileText,
  Key,
  Newspaper,
  Package,
  ScrollText,
  Search,
  Users,
  type LucideIcon,
} from 'lucide-react';
import type { PlanFeature } from '@/lib/api/subscriptions';

/**
 * Definition unique de la navigation applicative.
 *
 * Les deux espaces (produit et administration) partagent la meme structure, ce
 * qui permet a `AppShell` de rendre l'un ou l'autre sans duplication.
 */
export interface NavItem {
  key: string;
  label: string;
  href: string;
  icon: LucideIcon;
  /** Fonctionnalite requise par le plan d'abonnement. */
  requiredFeature?: PlanFeature;
}

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

export type ShellVariant = 'app' | 'admin';

type Translate = (key: string) => string;

interface AppNavParams {
  /** Traductions du namespace `dashboard`. */
  t: Translate;
  /** Traductions du namespace `shell`. */
  tShell: Translate;
  role?: string;
}

export function buildAppNav({ t, tShell, role }: AppNavParams): NavGroup[] {
  const canManageUsers = role === 'ADMIN' || role === 'MANAGER';

  return [
    {
      key: 'pilotage',
      label: tShell('groups.pilotage'),
      items: [
        {
          key: 'dashboard',
          label: t('nav.dashboard'),
          href: '/dashboard',
          icon: BarChart3,
          requiredFeature: 'dashboard',
        },
        { key: 'bookings', label: t('nav.bookings'), href: '/dashboard/bookings', icon: Package },
        {
          key: 'documents',
          label: t('nav.documents'),
          href: '/dashboard/documents',
          icon: FileText,
        },
        {
          key: 'tracking',
          label: t('nav.tracking'),
          href: '/dashboard/track-trace',
          icon: Search,
          requiredFeature: 'dashboard',
        },
      ],
    },
    {
      key: 'resources',
      label: tShell('groups.resources'),
      items: [
        {
          key: 'assistant',
          label: t('nav.assistant'),
          href: '/dashboard/assistant',
          icon: Bot,
        },
        {
          key: 'wiki',
          label: t('nav.wiki'),
          href: '/dashboard/wiki',
          icon: BookOpen,
          requiredFeature: 'wiki',
        },
      ],
    },
    {
      key: 'organization',
      label: tShell('groups.organization'),
      items: [
        {
          key: 'organization',
          label: t('nav.organization'),
          href: '/dashboard/settings/organization',
          icon: Building2,
        },
        ...(canManageUsers
          ? [
              {
                key: 'users',
                label: t('nav.users'),
                href: '/dashboard/settings/users',
                icon: Users,
                requiredFeature: 'user_management' as PlanFeature,
              },
            ]
          : []),
        {
          key: 'apiKeys',
          label: t('nav.apiKeys'),
          href: '/dashboard/settings/api-keys',
          icon: Key,
          requiredFeature: 'api_access' as PlanFeature,
        },
      ],
    },
  ];
}

interface AdminNavParams {
  /** Traductions du namespace `components.adminPanelDropdown`. */
  t: Translate;
  /** Traductions du namespace `shell`. */
  tShell: Translate;
}

export function buildAdminNav({ t, tShell }: AdminNavParams): NavGroup[] {
  return [
    {
      key: 'management',
      label: tShell('groups.management'),
      items: [
        { key: 'users', label: t('items.users'), href: '/admin/users', icon: Users },
        {
          key: 'organizations',
          label: t('items.organizations'),
          href: '/admin/organizations',
          icon: Building2,
        },
        { key: 'bookings', label: t('items.bookings'), href: '/admin/bookings', icon: Package },
        {
          key: 'documents',
          label: t('items.documents'),
          href: '/admin/documents',
          icon: FileText,
        },
      ],
    },
    {
      key: 'content',
      label: tShell('groups.content'),
      items: [
        {
          key: 'csvRates',
          label: t('items.csvRates'),
          href: '/admin/csv-rates',
          icon: BarChart3,
        },
        { key: 'blog', label: t('items.blog'), href: '/admin/blog', icon: Newspaper },
      ],
    },
    {
      key: 'system',
      label: tShell('groups.system'),
      items: [{ key: 'logs', label: t('items.logs'), href: '/admin/logs', icon: ScrollText }],
    },
  ];
}

/** Racine de l'espace, utilisee pour l'etat actif exact et le fil d'Ariane. */
export const SHELL_ROOT: Record<ShellVariant, string> = {
  app: '/dashboard',
  admin: '/admin',
};

/**
 * Un item est actif si la route courante est l'item lui-meme ou l'un de ses
 * descendants. La racine de l'espace exige une correspondance exacte, faute de
 * quoi elle resterait active sur toutes les pages.
 */
export function isItemActive(href: string, pathname: string, variant: ShellVariant): boolean {
  if (href === SHELL_ROOT[variant]) return pathname === href;
  return pathname === href || pathname.startsWith(href + '/');
}

/** Retrouve le groupe et l'item correspondant a la route courante. */
export function findActiveNav(groups: NavGroup[], pathname: string, variant: ShellVariant) {
  let best: { group: NavGroup; item: NavItem } | null = null;

  for (const group of groups) {
    for (const item of group.items) {
      if (!isItemActive(item.href, pathname, variant)) continue;
      // On garde la correspondance la plus specifique (href le plus long).
      if (!best || item.href.length > best.item.href.length) {
        best = { group, item };
      }
    }
  }
  return best;
}