import {
  ChartBarIcon,
  CloudIcon,
  GlobeIcon,
  LayoutDashboardIcon,
  ServerIcon,
  type LucideIcon,
} from "lucide-react"
import { formatAppVersionLabel, getAppVersion } from "@/lib/app-version"

export const CURRENT_APP_ID = "mm"

export type AppSwitcherIconName =
  | "server"
  | "cloud"
  | "globe"
  | "dashboard"
  | "chart"

export type AppSwitcherEntry = {
  id: string
  name: string
  subtitle?: string
  url: string
  icon: AppSwitcherIconName
  shortcut?: string
  enabled?: boolean
}

export type AppSwitcherConfig = {
  menuLabel: string
  apps: AppSwitcherEntry[]
}

export const APP_SWITCHER_ICONS: Record<AppSwitcherIconName, LucideIcon> = {
  server: ServerIcon,
  cloud: CloudIcon,
  globe: GlobeIcon,
  dashboard: LayoutDashboardIcon,
  chart: ChartBarIcon,
}

function localAppUrl(): string {
  if (typeof window !== "undefined") return window.location.origin
  return process.env.NEXT_PUBLIC_APP_URL?.replace(/\/$/, "") || "http://localhost:3000"
}

export function localMikrotikEntry(): AppSwitcherEntry {
  return {
    id: CURRENT_APP_ID,
    name: "MikrotikManager",
    subtitle: formatAppVersionLabel(getAppVersion()),
    url: localAppUrl(),
    icon: "dashboard",
    enabled: true,
  }
}

/** Offline fallback when auth-portal is unreachable. */
export const DEFAULT_APP_SWITCHER_CONFIG: AppSwitcherConfig = {
  menuLabel: "Приложения",
  apps: [
    localMikrotikEntry(),
    {
      id: "cfdm",
      name: "CF Domain Manager",
      subtitle: "Управление доменами",
      url: "https://cfdm.shnt.top",
      icon: "cloud",
    },
    {
      id: "vps",
      name: "VPS Tracker",
      subtitle: "Учёт виртуальных серверов",
      url: "https://vps.shnt.top",
      icon: "server",
    },
    {
      id: "bgp",
      name: "EvoBGP",
      subtitle: "BGP маршрутизация",
      url: "https://bgp.shnt.top",
      icon: "globe",
    },
    {
      id: "fw",
      name: "EvoFirewall",
      subtitle: "Firewall controller",
      url: "https://fw.shnt.top",
      icon: "server",
    },
    {
      id: "dns",
      name: "Technitium DNS",
      subtitle: "DNS-сервер",
      url: "https://dns.shnt.top",
      icon: "globe",
    },
  ],
}

const ICON_NAMES = new Set<AppSwitcherIconName>([
  "server",
  "cloud",
  "globe",
  "dashboard",
  "chart",
])

function asIcon(value: unknown): AppSwitcherIconName {
  return ICON_NAMES.has(value as AppSwitcherIconName)
    ? (value as AppSwitcherIconName)
    : "server"
}

export function parseAppSwitcherConfig(raw: unknown): AppSwitcherConfig | null {
  if (!raw || typeof raw !== "object") return null
  const data = raw as { menuLabel?: unknown; apps?: unknown }
  if (!Array.isArray(data.apps) || data.apps.length === 0) return null

  const apps: AppSwitcherEntry[] = []
  for (const item of data.apps) {
    if (!item || typeof item !== "object") continue
    const row = item as Record<string, unknown>
    if (typeof row.id !== "string" || typeof row.name !== "string" || typeof row.url !== "string") {
      continue
    }
    if (row.enabled === false) continue
    apps.push({
      id: row.id,
      name: row.name,
      subtitle: typeof row.subtitle === "string" ? row.subtitle : undefined,
      url: row.url,
      icon: asIcon(row.icon),
      shortcut: typeof row.shortcut === "string" ? row.shortcut : undefined,
      enabled: true,
    })
  }
  if (apps.length === 0) return null
  return {
    menuLabel: typeof data.menuLabel === "string" && data.menuLabel ? data.menuLabel : "Приложения",
    apps,
  }
}

export function mergeWithLocalApp(config: AppSwitcherConfig): AppSwitcherConfig {
  const local = localMikrotikEntry()
  const rest = config.apps.filter((app) => app.id !== CURRENT_APP_ID)
  return { ...config, apps: [local, ...rest] }
}

export function authPortalBaseUrl(): string | null {
  const raw = process.env.NEXT_PUBLIC_AUTH_PORTAL_URL?.trim()
  if (!raw) return null
  return raw.replace(/\/$/, "")
}

export function getCurrentApp(
  config: AppSwitcherConfig = DEFAULT_APP_SWITCHER_CONFIG,
): AppSwitcherEntry {
  return config.apps.find((app) => app.id === CURRENT_APP_ID) ?? localMikrotikEntry()
}