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;
}

export interface SidebarAgent {
  id: string;
  name: string;
  status: 'live' | 'stale' | 'dead';
  tps?: number;
}

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

/* ------------------------------------------------------------------ */
/*  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,
): 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: chevron(),
      badge: formatCount(r.exchangeCount),
      path: `/apps/${app.id}/${r.id}`,
      starrable: true,
      starKey: `route:${app.id}/${r.id}`,
    })),
  }));
}

/**
 * Agents tree — one node per app, agents as children.
 * Paths: /agents/{appId}, /agents/{appId}/{agentId}
 * Badge shows "N/M live".
 */
export function buildAgentTreeNodes(
  apps: SidebarApp[],
  statusDot: (health: string) => ReactNode,
): SidebarTreeNode[] {
  return apps.map((app) => {
    const liveCount = app.agents.filter((a) => a.status === 'live').length;
    return {
      id: `agent:${app.id}`,
      label: app.name,
      icon: statusDot(app.health),
      badge: `${liveCount}/${app.agents.length} live`,
      path: `/agents/${app.id}`,
      children: app.agents.map((a) => ({
        id: `agent:${app.id}/${a.id}`,
        label: a.name,
        icon: statusDot(a.status),
        badge: a.tps != null ? `${a.tps.toFixed(1)} msg/s` : undefined,
        path: `/agents/${app.id}/${a.id}`,
      })),
    };
  });
}

/**
 * Routes stats tree — one node per app, routes as children.
 * Paths: /routes/{appId}, /routes/{appId}/{routeId}
 */
export function buildRouteTreeNodes(
  apps: SidebarApp[],
  statusDot: (health: string) => ReactNode,
  chevron: () => ReactNode,
): SidebarTreeNode[] {
  return apps.map((app) => ({
    id: `route:${app.id}`,
    label: app.name,
    icon: statusDot(app.health),
    badge: `${app.routes.length} routes`,
    path: `/routes/${app.id}`,
    children: app.routes.map((r) => ({
      id: `route:${app.id}/${r.id}`,
      label: r.name,
      icon: chevron(),
      badge: formatCount(r.exchangeCount),
      path: `/routes/${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:appconfig', label: 'App Config', path: '/admin/appconfig' },
    { id: 'admin:database', label: 'Database', path: '/admin/database' },
    { id: 'admin:clickhouse', label: 'ClickHouse', path: '/admin/clickhouse' },
  ];
}