#!/usr/bin/env node
const https = require( 'https' );
const vm = require( 'vm' );
const fs = require( 'fs' );
const path = require( 'path' );

const intlUrl =
	'https://raw.githubusercontent.com/jackocnr/intl-tel-input/master/src/js/data.js';
const phoneUrl =
	'https://raw.githubusercontent.com/AfterShip/phone/master/src/data/country_phone_data.ts';

const fetch = ( url ) =>
	new Promise( ( resolve, reject ) => {
		https
			.get( url, ( res ) => {
				let body = '';

				res.on( 'data', ( chunk ) => {
					body += chunk;
				} );

				res.on( 'end', () => {
					resolve( body );
				} );
			} )
			.on( 'error', reject );
	} );

const numberOrString = ( str ) =>
	Number( str ).toString().length !== str.length ? str : Number( str );

const evaluate = ( code ) => {
	const script = new vm.Script( code );
	const context = vm.createContext();

	script.runInContext( context );

	return context;
};

const parse = ( data /*: any[]*/ ) /*: DataType*/ =>
	data.reduce(
		( acc, item ) => ( {
			...acc,
			[ item[ 0 ] ]: {
				alpha2: item[ 0 ],
				code: item[ 1 ].toString(),
				priority: item[ 2 ] || 0,
				start: item[ 3 ]?.map( String ),
				lengths: item[ 4 ],
			},
		} ),
		{}
	);

const saveToFile = ( data ) => {
	const dataString = JSON.stringify( data ).replace( /null/g, '' );
	const parseString = parse.toString().replace( / \/\*(.+?)\*\//g, '$1' );

	const code = [
		'// Do not edit this file directly.',
		'// Generated by /bin/packages/js/components/phone-number-input/build-data.js',
		'',
		'/* eslint-disable */',
		'',
		'import type { DataType } from "./types";',
		'',
		`const parse = ${ parseString }`,
		'',
		`const data = ${ dataString }`,
		'',
		'export default parse(data);',
	].join( '\n' );

	const filePath = path.resolve(
		'packages/js/components/src/phone-number-input/data.ts'
	);

	fs.writeFileSync( filePath, code );
};

( async () => {
	const intlData = await fetch( intlUrl ).then( evaluate );
	const phoneData = await fetch( phoneUrl )
		.then( ( data ) => 'var data = ' + data.substring( 15 ) )
		.then( evaluate );

	// Convert phoneData array to object
	const phoneCountries = phoneData.data.reduce(
		( acc, item ) => ( {
			...acc,
			[ item.alpha2.toLowerCase() ]: item,
		} ),
		{}
	);

	// Traverse intlData to create a new array with required fields
	const countries = intlData.allCountries.map( ( item ) => {
		const phoneCountry = phoneCountries[ item.iso2 ];
		const result = [
			item.iso2.toUpperCase(), // alpha2
			Number( item.dialCode ), // code
			/* [2] priority */
			/* [3] start */
			/* [4] lengths */
			,
			,
			,
		];

		if ( item.priority ) {
			result[ 2 ] = item.priority;
		}

		const areaCodes = item.areaCodes || [];
		const beginWith = phoneCountry?.mobile_begin_with || [];
		if ( areaCodes.length || beginWith.length ) {
			result[ 3 ] = [ ...new Set( [ ...areaCodes, ...beginWith ] ) ].map(
				numberOrString
			);
		}

		if ( phoneCountry?.phone_number_lengths ) {
			result[ 4 ] = phoneCountry.phone_number_lengths;
		}

		return result;
	} );

	saveToFile( countries );
} )();