import type { ReactNode } from 'react';
import type { SidebarTreeNode } from '@cameleer/design-system';

/* ------------------------------------------------------------------ */
/*  Domain types (moved out of DS — no longer exported there)         */
/* ------------------------------------------------------------------ */

export interface SidebarRoute {
  id: string;
  name: string;
  exchangeCount: number;
  routeState?: 'stopped' | 'suspended';
}

export interface SidebarApp {
  id: string;
  name: string;
  health: 'live' | 'stale' | 'dead';
  exchangeCount: number;
  routes: SidebarRoute[];
}

/* ------------------------------------------------------------------ */
/*  Formatting helpers                                                */
/* ------------------------------------------------------------------ */

export function formatCount(n: number): string {
  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1)}m`;
  if (n >= 1_000) return `${(n / 1_000).toFixed(1)}k`;
  return String(n);
}

/* ------------------------------------------------------------------ */
/*  localStorage collapse helpers                                     */
/* ------------------------------------------------------------------ */

export function readCollapsed(key: string, defaultValue: boolean): boolean {
  try {
    const raw = localStorage.getItem(key);
    if (raw === null) return defaultValue;
    return raw === 'true';
  } catch {
    return defaultValue;
  }
}

export function writeCollapsed(key: string, value: boolean): void {
  try {
    localStorage.setItem(key, String(value));
  } catch {
    // ignore quota errors
  }
}

/* ------------------------------------------------------------------ */
/*  Tree builders                                                     */
/* ------------------------------------------------------------------ */

/**
 * Apps tree — one node per app, routes as children.
 * Paths: /apps/{appId}, /apps/{appId}/{routeId}
 */
export function buildAppTreeNodes(
  apps: SidebarApp[],
  statusDot: (health: string) => ReactNode,
  chevron: () => ReactNode,
  stopIcon?: () => ReactNode,
  pauseIcon?: () => ReactNode,
): SidebarTreeNode[] {
  return apps.map((app) => ({
    id: app.id,
    label: app.name,
    icon: statusDot(app.health),
    badge: formatCount(app.exchangeCount),
    path: `/apps/${app.id}`,
    starrable: true,
    starKey: `app:${app.id}`,
    children: app.routes.map((r) => ({
      id: `${app.id}/${r.id}`,
      label: r.name,
      icon: r.routeState === 'stopped' && stopIcon
        ? stopIcon()
        : r.routeState === 'suspended' && pauseIcon
          ? pauseIcon()
          : chevron(),
      badge: r.routeState
        ? `${r.routeState.toUpperCase()} \u00b7 ${formatCount(r.exchangeCount)}`
        : formatCount(r.exchangeCount),
      path: `/apps/${app.id}/${r.id}`,
      starrable: true,
      starKey: `route:${app.id}/${r.id}`,
    })),
  }));
}

/**
 * Admin tree — static 6 nodes.
 */
export function buildAdminTreeNodes(): SidebarTreeNode[] {
  return [
    { id: 'admin:rbac', label: 'Users & Roles', path: '/admin/rbac' },
    { id: 'admin:audit', label: 'Audit Log', path: '/admin/audit' },
    { id: 'admin:oidc', label: 'OIDC', path: '/admin/oidc' },
    { id: 'admin:database', label: 'Database', path: '/admin/database' },
    { id: 'admin:clickhouse', label: 'ClickHouse', path: '/admin/clickhouse' },
  ];
}