// Local-only SDK substitute. Never imports the real IM SDK.
export function IM() {
  const send = options => {
    const msg = {idClient: 'local-'+Date.now(), time: Date.now(), from: '900000001', to: options.to, body: options.body || '', type: 'text', scene: options.scene}
    if (options.onSendBefore) options.onSendBefore(msg)
    return Promise.resolve(msg)
  }
  const unsupported = () => Promise.reject(new Error('本地模拟：媒体上传已禁用'))
  return {on(){},off(){},connect(){return Promise.resolve()},disconnect(){return Promise.resolve()},
    msg: {sendTextMsg:send,sendImageMsg:unsupported,sendVideoMsg:unsupported,sendAudioMsg:unsupported,sendMsgReceipt:()=>Promise.resolve()},
    session:{resetSessionUnreadCount:()=>Promise.resolve(),getSession:()=>Promise.resolve({unread:0})},
    user:{getUsersNameCardFromServer:()=>Promise.resolve([])},team:{updateMyMemberInfo:()=>Promise.resolve()}}
}