#!/usr/bin/env node
const { resolve } = require('path')

const switches = { json: false }, switchReg = /^=/
let params = process.argv.slice(2)
params = params.map( p=> switchReg.test(p) ? (switches[p.slice(1)] = true, null) : p )
				.filter( o=>o )

const moduleStr = params.shift()
const [ esmodule, exported ] = (moduleStr || '').split(':')

const optionReg = /^-{1,2}(.*?)([:=](.*?))?$/
const args = params.filter( s=> optionReg.test(s) )
					.reduce( (opt,str)=> {
							let [ , prop, , value ] = optionReg.exec(str)
							return Object.assign( opt, {[prop]: value || true} )
							// return hasValue ? { ...opt, [prop]: value || true }
															// : opt
						},
						params.filter( s=> !optionReg.test(s) )
					)

const package = resolve('./package.json')
,	modulo = resolve(esmodule)

//console.log( process.cwd(), package, modulo )
//console.log( process.argv, esmodule, exported, args )

require = require('esm')( module, {await: true} )


const render = obj=> switches.json
					? process.stdout.write( obj&& JSON.stringify(obj,null,'\t') || '' )
					: console.log( obj || '' )


let mod = require( modulo || require(package).module )
// console.log(mod)

let toCall = mod[ exported || 'default' ]
// console.log(mod, exported, toCall)
let returned =
		typeof toCall == 'function'
				? toCall( args )
				: toCall

//console.log( 'type' , typeof returned, returned instanceof Promise )
returned instanceof Promise
		? returned.then( render, e=>console.error(e) )
		: render(returned)

module.exports = mod