#!/usr/bin/env node

/**
* @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 resolve = require( 'path' ).resolve;
var resolveSync = require( 'resolve' ).sync;
var glob = require( 'glob' );
var readFileSync = require( '@stdlib/fs/read-file' ).sync;
var CLI = require( '@stdlib/cli/ctor' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var cwd = require( '@stdlib/process/cwd' );


// MAIN //

/**
* Main execution sequence.
*
* @private
* @returns {void}
*/
function main() {
	var filelist;
	var ropts;
	var flags;
	var gopts;
	var args;
	var cli;
	var idx;
	var dir;
	var r;
	var i;

	// Create a command-line interface:
	cli = new CLI({
		'pkg': require( './../package.json' ),
		'options': require( './../etc/cli_opts.json' ),
		'help': readFileSync( resolve( __dirname, '..', 'docs', 'usage.txt' ), {
			'encoding': 'utf8'
		})
	});

	// Get any provided command-line options:
	flags = cli.flags();
	if ( flags.help || flags.version ) {
		return;
	}

	// Get any provided command-line arguments:
	args = cli.args();

	dir = cwd();
	if ( flags.require ) {
		if ( isString( flags.require ) ) {
			flags.require = [ flags.require ];
		}
		ropts = {
			'basedir': dir
		};
		for ( i = 0; i < flags.require.length; i++ ) {
			r = flags.require[ i ];

			// Ignore a trailing `-r` or when a user may inadvertently provide an empty string `-r ""`:
			if ( r ) {
				require( resolveSync( r, ropts ) ); // eslint-disable-line stdlib/no-unassigned-require, stdlib/no-dynamic-require
			}
		}
	}
	filelist = [];
	idx = -1;

	// Resolve each glob...
	gopts = {
		'cwd': dir
	};
	return next();

	/**
	* Resolves the next glob.
	*
	* @private
	* @returns {void}
	*/
	function next() {
		var g;

		idx += 1;
		if ( idx < args.length ) {
			g = args[ idx ];
			return glob( g, gopts, onGlob );
		}
		run();
	}

	/**
	* Callback invoked upon resolving a glob.
	*
	* @private
	* @param {(Error|null)} error - error object
	* @param {(Array|StringArray)} files - file list
	*/
	function onGlob( error, files ) {
		var i;
		if ( error ) {
			throw error;
		}
		for ( i = 0; i < files.length; i++ ) {
			filelist.push( resolve( dir, files[ i ] ) );
		}
		next();
	}

	/**
	* Runs benchmarks.
	*
	* @private
	*/
	function run() {
		var i;
		for ( i = 0; i < filelist.length; i++ ) {
			require( filelist[ i ] ); // eslint-disable-line stdlib/no-unassigned-require, stdlib/no-dynamic-require
		}
	}
}

main();