// only core code snippets here
var initval = [0x00, 0x0e, 0xc6, 0xc1, 0x38, 0x41, 0x74, 0xa9, 0x12, 0x12, 0x03, 0x12, 0x08, 0x00];
const etypeOpts = [ { label: 'ipv4', value: '0x0800' }, { label: 'arp', value: '0x0806' } ];
function decode(arr, start) {
  var config = {
    key: 'eth',
    pos: [start, start + 13],
    children: [
      { key: 'dmac', value: array2mac(arr.slice(start, start + 6)), type: 'mac', pos: [start, start + 5], change: (arr, e) => mac_change(arr, e.pos, e.value) },
      { key: 'smac', value: array2mac(arr.slice(start + 6, start + 12)), type: 'mac', pos: [start + 6, start + 11], change: (arr, e) => mac_change(arr, e.pos, e.value) },
      { key: 'etype', value: num2hex(array2num(arr.slice(start + 12, start + 14))), options: etypeOpts, pos: [start + 12, start + 13], change: (arr, e) => num_change(arr, e.pos, e.value, 2) },
    ],
  };
  return config;
}
export default { name: 'eth', parents: 'none', initval: initval, decode: decode };

interface ProtocolDecodeFn {
  (_arr: Array<number>, _start: number): ProtocolConfig;
}

interface ProtocolChangeFn {
  (_arr: Array<number>, _e: ProtocolConfig): Array<number>;
}

interface ProtocolCheckFn {
  (_arr: Array<number>, _e: ProtocolConfig): any;
}
interface ProtocolUpdateFn {
  (_arr: Array<number>, _e: ProtocolConfig): Array<number>;
}

export interface ProtocolParentItem {
  name: string;
  pname: string;
  pval: any;
}
export interface ProtocolConfig {
  key: string;
  pos: Array<number>;
  children?: Array<ProtocolConfig>;
  type?: 'number' | 'mac' | 'ipv4' | 'hex' | 'pkt';
  value?: any;
  options?: Array<any>;
  status?: 'error';
  change?: ProtocolChangeFn;
  check?: ProtocolCheckFn;
  update?: ProtocolUpdateFn;
}
export interface ProtocolItem {
  name: string;
  priority?: number;
  parents: string | Array<ProtocolParentItem>;
  initval: Array<number>;
  decode: ProtocolDecodeFn;
}