/**
 *      This module provides native variable type checking utilities
 *      It has no external dependencies
 *      Single-line functions used for conciseness
 *      No parsing or coercion is performed
 */
const TypeUtils = {

	// Strings
	isString: value => typeof value === 'string',

	// Number
	isNumber: value => !isNaN ( value ) && typeof value === 'number',

	// Integer
	isInteger: value => parseInt ( value, 10 ) === value,

	// Float
	isFloat: value => ('' + value).includes ( '.' ) && parseFloat ( value ) === value,

	// Infinite
	isInfinite: value => value === Infinity,

	// Boolean
	isBoolean: value => [ false, true ].includes ( value ),

	// Object
	isObject: value => typeof value === 'object' && !Array.isArray ( value ),

	// Array
	isArray: value => Array.isArray ( value ),

	// Array-like - Array, Set, Map
	isArrayLike: value => value instanceof Set || value instanceof Map || Array.isArray ( value ),

	// Function
	isFunction: value => typeof value === 'function',

	// Null
	isNull: value => value === null,

	// Undefined
	isUndefined: value => value === undefined,

	// Null or undefined
	isNullOrUndefined: value => [ null, undefined ].includes ( value ),

	// Empty
	// Numbers, Booleans aren't ever considered "empty"
	isEmpty: value => {

		// Null / Undefined
		if ( TypeUtils.isNull ( value ) || TypeUtils.isUndefined ( value ) ) {
			return true;
		}

		// String
		if ( TypeUtils.isString ( value ) && value.length === 0 ) {
			return true;
		}

		// Arrays
		if ( TypeUtils.isArray ( value ) ) {
			return value.length === 0;
		}

		// Sets, Maps
		if ( TypeUtils.isArrayLike ( value ) ) {
			return value.size === 0;
		}

		// Objects
		if ( TypeUtils.isObject ( value ) && Object.keys ( value ).length === 0 ) {
			return true;
		}

		return false;

	},

	// Date
	isDate: value => {

		return (
			!TypeUtils.isNullOrUndefined ( value )
			&& value.constructor === Date
			&& TypeUtils.isInteger ( value.getTime () )
		);

	},

	// Promise
	isPromise: value => Boolean ( value && TypeUtils.isFunction ( value.then ) )

};

module.exports = TypeUtils;