import { requireOptionalNativeModule } from 'expo-modules-core'

export type EasyTierConfigInput = {
  networkName: string
  networkSecret: string
  peerUrls: string[]
}

type NativeModule = {
  isAvailable: () => boolean
  saveAndPrepareTunnel: (configJson: string) => Promise<Record<string, unknown>>
  checkVpnPermissionGranted: () => Promise<Record<string, unknown>>
}

const Native = requireOptionalNativeModule<NativeModule>('ExpoEasyTierVpn')

export function isExpoEasyTierVpnAvailable(): boolean {
  try {
    return Native?.isAvailable?.() === true
  } catch {
    return false
  }
}

export async function saveAndPrepareTunnel(config: EasyTierConfigInput): Promise<Record<string, unknown>> {
  if (!Native?.saveAndPrepareTunnel) {
    return { ok: false, reason: 'native_module_missing' }
  }
  return Native.saveAndPrepareTunnel(JSON.stringify(config))
}

export async function checkVpnPermissionGranted(): Promise<boolean> {
  if (!Native?.checkVpnPermissionGranted) return false
  const r = await Native.checkVpnPermissionGranted()
  return r?.granted === true
}