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const gulp = require( 'gulp' );
const child   = require( 'child_process' );const fs      = require( 'fs' );const rimraf  = require( 'rmfr' );const mkdirp  = require( 'mkdirp' );const replace = require( 'replace' );

const libphonenumberVersion =	fs.readFileSync( 'libphonenumber.version', 'utf8' ).toString( ).trim( );
const rootDir = '.';const buildRoot = `${rootDir}/build`;const libphonenumberUrl = 'https://github.com/google/libphonenumber/';const closureLinterUrl = 'https://github.com/google/closure-linter';const pythonGflagsUrl = 'https://github.com/google/python-gflags.git';const antName = 'apache-ant-1.10.12';const antTar = `${antName}.tar.gz`;const antUrl = `https://downloads.apache.org/ant/binaries/${antName}-bin.tar.gz`;
const isDebug = process.env.DEBUG && process.env.DEBUG !== '0';
gulp.task( 'clean', ( ) =>	rimraf( buildRoot ));
gulp.task( 'make-build-dir', async ( ) =>	await mkdirp( buildRoot ));
gulp.task( 'clone-libphonenumber', gulp.series( 'make-build-dir', ( ) =>	gitClone( libphonenumberUrl, 'libphonenumber', libphonenumberVersion )) );
gulp.task( 'checkout-closure-linter', gulp.series( 'make-build-dir', ( ) =>	gitClone( closureLinterUrl, 'closure-linter' )) );
gulp.task( 'checkout-python-gflags', gulp.series( 'make-build-dir', ( ) =>	gitClone( pythonGflagsUrl, 'python-gflags' )) );
gulp.task( 'download-ant', gulp.series(	'make-build-dir',	( ) =>		runCommand(			'curl',			[ '-L', '-o', antTar, antUrl ],			{ cwd: buildRoot }		),	( ) =>		runCommand(			'tar',			[ 'zxf', antTar ],			{ cwd: buildRoot }		)) );
gulp.task( 'download-deps', gulp.parallel(	'clone-libphonenumber',	'checkout-closure-linter',	'checkout-python-gflags',	'download-ant') );
gulp.task( 'build-deps', gulp.series( 'download-deps' ) );
gulp.task( 'build-libphonenumber', ( ) =>	runCommand( `${rootDir}/build.sh`, [ ], { cwd: rootDir } ));
gulp.task( 'build', gulp.series( 'build-deps', 'build-libphonenumber' ) );
gulp.task( 'update-readme', ( ) =>	updateReadme( ));
gulp.task( 'default', gulp.series( 'clean', 'build', 'update-readme' ) );
async function updateReadme( ){	replace( {		regex: 'Uses libphonenumber ([A-Za-z.0-9]+)',		replacement: `Uses libphonenumber ${libphonenumberVersion}`,		paths: [ 'README.md' ],		silent: true,	} );}
function gitClone( url, name, branch ){	const args = [ '--depth=1' ];	if ( branch )		args.push( '--branch=' + branch );
	return runCommand( 'git', [ 'clone', ...args, url, name ] );}
function runCommand( cmd, args, opts ){	opts = opts || {		cwd   : './build',		stdio : [ null, null, isDebug ? process.stderr : null ]	};
	return new Promise( function( resolve, reject ) {		var cp = child.spawn( cmd, args, opts );		cp.stdout.on( 'data', data => {			if ( isDebug )				console.log( data.toString( ) );		} );		cp.on( 'close', code => {			if ( code === 0 )				return resolve( );			reject( new Error(				`${cmd} exited with exitcode ${code}. Args: ${args}` ) );		} );		cp.on( 'error', err => reject( err ) );	} );}