#!/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;

// NOTE: we explicitly avoid using `@stdlib/fs/read-file` in this particular package in order to avoid circular dependencies. This should not be problematic as this command-line utility will be executed via Node.js.
var readFileSync = require( 'fs' ).readFileSync; // eslint-disable-line no-sync
var CLI = require( '@stdlib/cli/ctor' );
var manifest = require( './../lib' );


// MAIN //

/**
* Main execution sequence.
*
* @private
*/
function main() {
	var conditions;
	var flags;
	var args;
	var conf;
	var opts;
	var cli;
	var v;
	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();

	opts = {};
	if ( flags.dir ) {
		opts.basedir = flags.dir;
	}
	if ( flags.paths ) {
		opts.paths = flags.paths;
	}
	conditions = {};
	for ( i = 0; i < flags[ '--' ].length; i++ ) {
		v = flags[ '--' ][ i ];
		v = v.split( '=' );
		if ( v.length === 2 ) {
			conditions[ v[ 0 ].substring( 2 ) ] = v[ 1 ];
		} else {
			conditions[ v[ 0 ].substring( 2 ) ] = flags[ '--' ][ i+1 ];
			i += 1;
		}
	}
	conf = manifest( args[ 0 ], conditions, opts );
	console.log( JSON.stringify( conf ) ); // eslint-disable-line no-console
}

main();