module.exports = {
	download
};

const request = require('request');
const fs = require('fs');
const os = require('os');
const {execSync} = require('child_process');
const path = require('path');
const copydir = require('copy-dir');

async function download() {

	
	let url = await getPythonDownloadLink();
	let filename = path.parse(url).base;
	try {
		fs.mkdirSync('Python-Installer');
	} catch(e) {'';}
	try {
		fs.mkdirSync('Python');
	} catch(e) {'';}
	try {
		fs.mkdirSync('Temp-Python');
	} catch(e) {'';}
	try {
		fs.writeFileSync('.installerLocation', filename);
	} catch(e) {'';}
	// let installSettings = fs.readFileSync('unattend.xml');

	let out_file = `Python-Installer/${filename}`

	await new Promise(resolve => {
		request({
			uri: url,
			encoding: null
		}, function (error, response, body) {
			fs.writeFileSync(out_file, body, {});
			resolve();
		});
	});

	console.log('Download Complete!');

	switch (os.platform())
	{
		case 'win32': {
			try {
				let installerPath = path.join(__dirname, '..', 'Python-Installer/', filename);
				let tempPath = path.join(__dirname, '..', 'Temp-Python/');
				let targetPath = path.join(__dirname, '..', 'Python/');
				execSync(`${installerPath} /passive DefaultJustForMeTargetDir=${tempPath}`, {
					stdio: "inherit"
				});
				
				console.log("Creating Portable Python Directory");

				copydir.sync(tempPath, targetPath);
				console.log("Portable Directory Created!");

				console.log("Uninstalling Unnecessary Python Files");

				execSync(`${installerPath} /passive /uninstall`, {
					stdio: 'inherit'
				});

				fs.rmdirSync(tempPath);

				console.log("PordaPy Installed!");
			} catch (err) {
				console.log(err);
			}
			break;
		}
	}
}

function getPythonDownloadLink() {
	return new Promise(resolve => {
		request({
			uri: "https://www.python.org/downloads/",
		}, function (error, response, body) {
			let current_os = '';
			switch (os.platform())
			{
				case 'darwin':
					current_os = "download-os-mac-osx";
					break;
				case 'linux':
					current_os = "download-os-source";
					break;
				case 'win32':
					current_os = "download-os-windows";
					break;
				default:
					current_os = "download-os-source";
					break;
			}
			
			let current_download_start = body.indexOf("href=",body.indexOf(current_os)) + 6;
			let current_download_end = body.indexOf('">', current_download_start);
			let current_download = body.substring(current_download_start, current_download_end);

			let url = current_download;

			resolve(url);
		});
	});
	

}