var input = require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>a);
var timeline = [];
var events = input.sort((a,b)=>{
	var pa = a.match(/\[(\d+-\d+-\d+ (\d+):(\d+))\] (.*)/);
	var pb = b.match(/\[(\d+-\d+-\d+ (\d+):(\d+))\] (.*)/);
	return new Date(pa[1]).getTime() - new Date(pb[1]).getTime();
})

console.log(events);

var guards = [];
var lastGuard = -1;
for(var event of events){
	var p = event.match(/\[(\d+-\d+-\d+ (\d+):(\d+))\] (.*)/);
	var time = (parseInt(p[2])*60) + parseInt(p[3])
	if(p[4].includes("begins shift")){
		lastGuard = parseInt(p[4].match(/\#(\d+)/)[1]);
	}
	else{
		if(!guards[lastGuard]){
			guards[lastGuard] = [];
		}
		guards[lastGuard].push(time);
	}
}

var guardLengths = guards.map(g=>{
	var total = 0;
	for(var i = 0; i < g.length; i+=2){
		if(g[i+1]<g[i]){
			total += 60*12;
		}
		total += g[i+1] - g[i];
	}
	return total;
});

console.log(guards);
console.log(guardLengths);
var max = Math.max.apply(null, guardLengths.filter(a=>a));
var bestGuard = guardLengths.indexOf(max);
console.log(bestGuard, guards[bestGuard]);

var mins = [];
var times = guards[bestGuard];
for(var i = 0; i < times.length; i+=2){
	for(var t = times[i]; t != times[i+1]; t=(t+1)%(24*60)){
		console.log(t);
		if(!mins[t]){
			mins[t] = 0;
		}
		mins[t]++;
	}
}
console.log(mins);
var bestMin = mins.indexOf(Math.max.apply(null, mins.filter(a=>a)))
console.log(Math.max.apply(null, mins.filter(a=>a)))
console.log(bestMin);
console.log(bestMin * bestGuard);