adventofcode/2018/day04-1.go

package main

import (
	"fmt"

	"internal/guards"
	"internal/util"
)

func main() {
	data := util.ReadInput()
	shifts := guards.ParseInput(data)
	guards := guards.BuildGuards(shifts)

	sleepiest, sleepiestMinute := FindSleepiestData(guards)

	fmt.Printf("Sleepiest Guard: %d\n", sleepiest.ID)
	fmt.Printf("Sleepiest Minute: %d\n", sleepiestMinute)
	fmt.Printf("Result: %d\n", sleepiest.ID*sleepiestMinute)
}

func FindSleepiestData(data map[int]*guards.Guard) (*guards.Guard, int) {
	var sleepiest *guards.Guard
	for _, guard := range data {
		if sleepiest == nil {
			sleepiest = guard
			continue
		}

		if guard.SleepTotal > sleepiest.SleepTotal {
			sleepiest = guard
		}
	}

	sleepiestMinute := -1
	sleepiestCount := 0
	for minute, sleepiness := range sleepiest.Sleep {
		if sleepiness > sleepiestCount {
			sleepiestCount = sleepiness
			sleepiestMinute = minute
		}
	}

	return sleepiest, sleepiestMinute
}