#!/usr/bin/env node

var fs=require('fs');
var os=require('os');
var i3 = require('i3').createClient();
//var i3 = require('/usr/lib/node_modules/i3/index').createClient();
var cons=[];
var event = function() {
	let msg=arguments[0];
	if (msg.change === 'focus') {
		if(cons[cons.length-1] !== msg.container.id) {
			let index=cons.indexOf(msg.container.id);
			if (index > -1) {
				cons.splice(index,1);
			}
			cons.push(msg.container.id);
		}
	} else if (msg.change === 'close') {
		cons.splice(cons.indexOf(msg.container.id),1);
	} else if (msg.change === 'new') {
		cons.push(msg.container.id);
	}
};
var focus_last = function() {
	if (cons.length>1) {
		let command='[con_id="'+cons[cons.length-2].toString()+'"] focus';
		//console.log(command);
		i3.command(command);
	}
}
process.on('SIGUSR2', focus_last);
i3.on('window', event);

fs.writeFile(os.tmpdir+"/focus_last.pid", process.pid, function(err) {
	if (err) {
		return console.log(err);
	}
});