"use strict";

const errors = require("../errors");
const getValueType = require("../util/get-value-type");

module.exports = function createFunctionValidatorFunction(options = {}) {
	let guardedFunctionDescription = getValueType({
		_isTypeRule: true,
		_baseType: "guardedFunction",
		_options: options
	});

	// options.args
	// options.returnValue

	return function validateFunction(value) {
		if (typeof value === "function" && value._guardedFunction != null) {
			/* FIXME: Verify that the function signature matches. */
			return true;
		} else {
			return new errors.ValidationError(`Expected ${guardedFunctionDescription}, got ${getValueType(value)} instead`);
		}
	};
};