export interface XuqmInitOptions {
  appKey: string
  platformUrl?: string  // 不传则使用内置默认公有平台地址
  debug?: boolean
}

export interface XuqmConfig {
  appKey: string
  apiUrl: string
  imWsUrl: string
  fileServiceUrl: string
  licenseUrl: string
  debug: boolean
  // 服务开通状态（由平台远程配置决定）
  imEnabled: boolean
  pushEnabled: boolean
  licenseEnabled: boolean
}

export interface XuqmUserInfo {
  userId: string
  userSig?: string   // IM 登录凭证；未开通 IM 时可不传
  name?: string
  email?: string
  phone?: string
  avatar?: string
}

// ─── Internal state ────────────────────────────────────────────────────────────

let _config: XuqmConfig | null = null
let _userId: string | null = null
let _userInfo: XuqmUserInfo | null = null
const _userInfoHandlers: Array<(info: XuqmUserInfo | null) => void> = []

// ─── Config ────────────────────────────────────────────────────────────────────

export interface XuqmRemoteConfig {
  imApiUrl?: string
  apiUrl?: string
  imWsUrl?: string
  fileServiceUrl?: string
  licenseUrl?: string
  imEnabled?: boolean
  pushEnabled?: boolean
  licenseEnabled?: boolean
}

export function initConfigFromRemote(
  options: XuqmInitOptions,
  remote: XuqmRemoteConfig,
): void {
  const apiUrl = remote.imApiUrl ?? remote.apiUrl ?? ''
  _config = {
    appKey:          options.appKey,
    apiUrl,
    imWsUrl:         remote.imWsUrl ?? '',
    fileServiceUrl:  remote.fileServiceUrl ?? apiUrl,
    licenseUrl:      remote.licenseUrl ?? apiUrl,
    debug:           options.debug ?? false,
    imEnabled:       remote.imEnabled ?? !!remote.imWsUrl,
    pushEnabled:     remote.pushEnabled ?? true,
    licenseEnabled:  remote.licenseEnabled ?? false,
  }
}

export function getConfig(): XuqmConfig {
  if (!_config) throw new Error('[XuqmSDK] Not initialized — call XuqmSDK.initialize() first.')
  return _config
}

export function isInitialized(): boolean {
  return _config !== null
}

// ─── UserId ────────────────────────────────────────────────────────────────────

export function setUserId(userId: string | null): void {
  _userId = userId
}

export function getUserId(): string | null {
  return _userId
}

// ─── UserInfo + subscribers ────────────────────────────────────────────────────

export function _registerUserInfoHandler(handler: (info: XuqmUserInfo | null) => void): void {
  _userInfoHandlers.push(handler)
}

export function setUserInfo(info: XuqmUserInfo | null): void {
  _userInfo = info
  _userId = info?.userId ?? null
  for (const handler of _userInfoHandlers) {
    try { handler(info) } catch { /* sub-SDK errors must not break the chain */ }
  }
}

export function getUserInfo(): XuqmUserInfo | null {
  return _userInfo
}