/**
* Prerequsite to run this script: 
*   - ImageMagick installed
*   - Node (>= 12LTS)
* 
* Save this somewhere on your machine as a node script (my choice is usually ~/bin/node_scripts)
*
* After alias it in zshrc as: 
*   alias image_combine="node ~/node_scripts/image-combine.js"
*
* Use it like anywhere from command line like (by default combining images vertically):
*   imagecombine file1.png file2.png fileout.png [--horizontal]
*/

const { spawnSync } = require('child_process');
const directionMap = { '--vertical': '+append', '--horizontal': '-append' };
let userPreference = '--vertical';

if (process.argv.filter(x => x === '--horizontal').length) {
	userPreference = '--horizontal'
}

const cleanArgs = () => {
	const args = [...process.argv.slice(2)].filter(x => !x.startsWith('--'));
	return args;
}

const processArgs = cleanArgs();

if (!processArgs.length || processArgs.length < 3) {
	console.log('Please provide arguments in the following format: fileIn1.png fileIn2.png fileOut.png [--horizontal]')
	return;
}

console.log(`Running in ${userPreference} mode`);

let sp = spawnSync('convert', [directionMap[userPreference], ...processArgs], { stdio: ['inherit', 0, 'inherit']});

if (!sp.status) {
	console.log(`Wonderful! Your image has been created! ;)`)
}