/**
* @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 hasOwnProp = require( '@stdlib/assert/has-own-property' );


// MAIN //

/**
* Generates an assertion.
*
* @private
* @param {boolean} ok - assertion outcome
* @param {Options} opts - options
*/
function assert( ok, opts ) {
	/* eslint-disable no-invalid-this, no-unused-vars */ // TODO: remove no-unused-vars once `err` is used
	var result;
	var err;

	result = {
		'id': this._count,
		'ok': ok,
		'skip': opts.skip,
		'todo': opts.todo,
		'name': opts.message || '(unnamed assert)',
		'operator': opts.operator
	};
	if ( hasOwnProp( opts, 'actual' ) ) {
		result.actual = opts.actual;
	}
	if ( hasOwnProp( opts, 'expected' ) ) {
		result.expected = opts.expected;
	}
	if ( !ok ) {
		result.error = opts.error || new Error( this.name );
		err = new Error( 'exception' );

		// TODO: generate an exception in order to locate the calling function (https://github.com/substack/tape/blob/master/lib/test.js#L215)
	}
	this._count += 1;
	this.emit( 'result', result );
}


// EXPORTS //

module.exports = assert;
