/// 把账号服务 `/api/rtc_token` 的响应收成进房凭证。
///
/// 现网成功体：`{ code: 0, data: { token } }`，可选 `liveURL` / `serverUrl`。
/// 缺少直播地址时由调用方填 [fallbackLiveUrl]，不得改服务端。
class CompanyRtcCredential {
  const CompanyRtcCredential({required this.token, required this.liveURL});

  final String token;
  final String liveURL;
}

class RtcTokenMapper {
  RtcTokenMapper._();

  static CompanyRtcCredential parse(
    dynamic body, {
    required String fallbackLiveUrl,
  }) {
    if (body is! Map) {
      throw const FormatException('语音通话凭证格式不正确');
    }
    final map = Map<String, dynamic>.from(body);
    final code = map['code'];
    if (code != null && code != 0) {
      final msg = map['msg']?.toString() ?? '';
      throw FormatException(msg.isNotEmpty ? msg : '获取通话凭证失败');
    }
    final data = map['data'];
    final payload = data is Map ? Map<String, dynamic>.from(data) : map;
    final token = payload['token']?.toString() ?? '';
    if (token.isEmpty) {
      throw const FormatException('服务器未返回通话凭证');
    }
    final live = payload['liveURL']?.toString() ??
        payload['serverUrl']?.toString() ??
        '';
    return CompanyRtcCredential(
      token: token,
      liveURL: live.isNotEmpty ? live : fallbackLiveUrl,
    );
  }
}