/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var isArray = require( '@stdlib/assert-is-array' );
var format = require( '@stdlib/string-format' );


// MAIN //

/**
* Returns a function which tests if every element in an array passes a test condition.
*
* @param {Function} predicate - function to apply
* @throws {TypeError} must provide a function
* @returns {Function} an array function
*
* @example
* var isOdd = require( '@stdlib/assert-is-odd' );
*
* var arr1 = [ 1, 3, 5, 7 ];
* var arr2 = [ 3, 5, 8 ];
*
* var validate = arrayfcn( isOdd );
*
* var bool = validate( arr1 );
* // returns true
*
* bool = validate( arr2 );
* // returns false
*/
function arrayfcn( predicate ) {
	if ( typeof predicate !== 'function' ) {
		throw new TypeError( format( 'invalid argument. Must provide a function. Value: `%s`.', predicate ) );
	}
	return every;

	/**
	* Tests if every element in an array passes a test condition.
	*
	* @private
	* @param {*} value - value to test
	* @returns {boolean} boolean indicating whether a value is an array for which all elements pass a test condition
	*/
	function every( value ) {
		var len;
		var i;
		if ( !isArray( value ) ) {
			return false;
		}
		len = value.length;
		if ( len === 0 ) {
			return false;
		}
		for ( i = 0; i < len; i++ ) {
			if ( predicate( value[ i ] ) === false ) {
				return false;
			}
		}
		return true;
	}
}


// EXPORTS //

module.exports = arrayfcn;