import fastCall from '@/util/fast-call.js';

export default function(node, {evaluate, scope}) {
  let asyncArgs = false;
  const args = [];
  for (let i = 0; i < node.arguments.length; i++) {
    const arg = node.arguments[i];
    const {async, value} = evaluate(arg, {scope});
    asyncArgs ||= async;
    args.push(value);
  }
  const {callee} = node;
  const {
    computed,
    object,
    property,
  } = callee;
  const invoke = (fn, holder, args) => {
    if (node.optional && !fn) {
      return undefined;
    }
    return fastCall(fn, holder, args);
  };
  if (!('MemberExpression' === callee.type)) {
    const {async, value} = evaluate(callee, {scope});
    if (asyncArgs || async) {
      return {
        async: true,
        value: Promise
          .all([value, Promise.all(args)])
          .then(([callee, args]) => invoke(callee, undefined, args)),
      };
    }
    return {value: invoke(value, undefined, args)};
  }
  const O = evaluate(object, {scope});
  const P = computed
    ? evaluate(property, {scope})
    // Otherwise, identifier.
    : {value: property.name};
  if (asyncArgs || O.async || P.async) {
    return {
      async: true,
      value: Promise
        .all([O.value, P.value, Promise.all(args)])
        .then(([O, P, args]) => invoke(callee.optional ? O?.[P] : O[P], O, args)),
    };
  }
  return {
    async: false,
    value: invoke(callee.optional ? O.value?.[P.value] : O.value[P.value], O.value, args),
  };
}