import { getExternalKeys } from '@mapl/compiler';
import { compileRouter as compileRouterContent } from '@mapl/router';
const PATH = "__req_p";
const REQ = '__req';
const PARAMS = `${REQ}_ps`;

export function compileRouter(root) {
  const state = {
    contentBuilder: [],
    declarationBuilders: [],
    externalValues: [],

    compileItem: (item, state, hasParam) => {
      state.contentBuilder.push(`return [f${state.externalValues.push(item)},${hasParam ? PARAMS : '[]'}];`);
    }
  };

  compileRouterContent(root, state);

  // eslint-disable-next-line
  return Function(
    ...getExternalKeys(state),
    `return (${PATH})=>{${state.contentBuilder.join('')}return null;}`
  )(...state.externalValues);
}