"use strict";

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

module.exports = function createNumberValidatorFunction(options = {}, name = "<unknown>") {
	let mayBeNaN = (options.mayBeNaN === true);
	let mayBeInfinity = (options.mayBeInfinity === true);
	let hasMinimum = (options.minimum != null);
	let hasMaximum = (options.maximum != null);

	if (hasMinimum && typeof options.minimum !== "number") {
		throw new Error("Minimum value for number must be a number");
	} else if (hasMaximum && typeof options.maximum !== "number") {
		throw new Error("Maximum value for number must be a number");
	} else if (hasMinimum && hasMaximum && options.minimum > options.maximum) {
		throw new Error("Minimum value for number cannot be higher than maximum value");
	} else {
		return function validateNumber(value) {
			/* TODO: More consistent error message format, with consistent property path metadata? */
			if (typeof value !== "number") {
				return new errors.ValidationError(`Expected a number, got ${getValueType(value)} instead`);
				// return new errors.ValidationError(`Specified value for property '${name}' is not a number`, {
				// 	value: value,
				// 	property: name
				// });
			} else if (!mayBeNaN && isNaN(value)) {
				return new errors.ValidationError(`Specified value for property '${name}' is NaN, but this is not allowed`, {
					property: name
				});
			} else if (!mayBeInfinity && !isFinite(value)) {
				return new errors.ValidationError(`Specified value for property '${name}' is an infinite value, but this is not allowed`, {
					property: name
				});
			} else if (hasMinimum && value < options.minimum) {
				return new errors.ValidationError(`Value for property '${name}' must be at least ${options.minimum}`, {
					property: name
				});
			} else if (hasMaximum && value > options.maximum) {
				return new errors.ValidationError(`Value for property '${name}' cannot be higher than ${options.maximum}`, {
					property: name
				});
			} else {
				return true;
			}
		};
	}
};