export interface GuanghuShanghaiNodeStatus {
  nodeId: 'BS-SH-005'
  reachability: 'online' | 'unreachable'
  region: 'shanghai'
  runtime: 'guanghu_os_native' | 'hosted_maintenance' | 'unknown'
  ttl: number | null
}

export interface GuanghuShanghaiNodeState {
  checkedAt: number | null
  error: string | null
  phase: 'checking' | 'online' | 'error'
  status: GuanghuShanghaiNodeStatus | null
}

export const INITIAL_GUANGHU_SHANGHAI_NODE_STATE: GuanghuShanghaiNodeState = {
  checkedAt: null,
  error: null,
  phase: 'checking',
  status: null,
}

function record(value: unknown): Record<string, unknown> | null {
  return typeof value === 'object' && value !== null && !Array.isArray(value)
    ? value as Record<string, unknown>
    : null
}

export function parseGuanghuShanghaiNodeStatus(
  value: unknown,
): GuanghuShanghaiNodeStatus {
  const status = record(value)
  const runtime = status?.runtime
  const reachability = status?.reachability
  if (
    status?.node_id !== 'BS-SH-005'
    || status.region !== 'shanghai'
    || (reachability !== 'online' && reachability !== 'unreachable')
    || !['guanghu_os_native', 'hosted_maintenance', 'unknown'].includes(
      typeof runtime === 'string' ? runtime : '',
    )
  ) {
    throw new Error('guanghu_shanghai_node_receipt_invalid')
  }
  return {
    nodeId: 'BS-SH-005',
    reachability,
    region: 'shanghai',
    runtime: runtime as GuanghuShanghaiNodeStatus['runtime'],
    ttl: typeof status.ttl === 'number' ? status.ttl : null,
  }
}