package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"
)

func parseBank(text string) []int {
	bank := make([]int, 0, len(text))
	for _, char := range text {
		battery, err := strconv.Atoi(string(char))
		if err != nil {
			panic(err)
		}
		bank = append(bank, battery)
	}

	return bank
}

func main() {

	file, err := os.Open("three.txt")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	ch := make(chan int)
	n_banks := 0
	jolts := 0

	for scanner.Scan() {
		n_banks++
		text := scanner.Text()

		bank := parseBank(text)

		go joltage(bank, ch)
	}

	for i := 0; i < n_banks; i++ {
		jolts += <-ch
	}

	fmt.Println(jolts)
}

func joltage(bank []int, ch chan int) {
	ch <- _joltage(bank)
}

func _joltage(bank []int) int {
	out := 0

	startIndex := 0

	for endIndex := len(bank) - 11; endIndex <= len(bank); endIndex++ {

		out *= 10
		highest, index := highestEarly(bank, startIndex, endIndex)
		out += highest
		startIndex = index + 1

	}

	return out
}

func highestEarly(bank []int, start int, end int) (int, int) {
	highest := 0
	index := 0

	for i := start; i < end; i++ {
		val := bank[i]
		if val > highest {
			highest = val
			index = i
		}
	}

	return highest, index
}