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

export const DEFAULT_EASYTIER_PEER_URLS = ['tcp://public.easytier.top:11010']

function normalizePeerUrls(value: unknown): string[] {
  const seen = new Set<string>()
  const next = Array.isArray(value) ? value.map(String) : []
  const normalized = next
    .map((item) => item.trim())
    .filter((item) => {
      if (!item || seen.has(item)) return false
      seen.add(item)
      return true
    })
  return normalized.length > 0 ? normalized : [...DEFAULT_EASYTIER_PEER_URLS]
}

/** 与 Electron `remote:get-bind-payload` 输出一致，供扫码导入 */
export type BindPayload = {
  v: 1
  baseUrl: string
  port: number
  token: string
  easytier: EasyTierConfig
}

export function parseBindPayload(raw: string): BindPayload | null {
  try {
    const j = JSON.parse(raw) as Record<string, unknown>
    if (j.v !== 1) return null
    const et = j.easytier as Record<string, unknown> | undefined
    if (!et || typeof j.baseUrl !== 'string' || typeof j.token !== 'string') return null
    const networkName = String(et.networkName ?? '').trim()
    const networkSecret = String(et.networkSecret ?? '').trim()
    if (!networkName || !networkSecret) return null
    return {
      v: 1,
      baseUrl: String(j.baseUrl).replace(/\/$/, ''),
      port: typeof j.port === 'number' ? j.port : Number(j.port) || 8001,
      token: String(j.token),
      easytier: {
        networkName,
        networkSecret,
        peerUrls: normalizePeerUrls(et.peerUrls),
      },
    }
  } catch {
    return null
  }
}