package day1

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

func Run(filename string) {
	file, err := os.Open(filename)

	if err != nil {
		fmt.Println("Error opening file:", err)
		return
	}

	scanner := bufio.NewScanner(file)
	scanner.Split(bufio.ScanLines)

	var elf_totals []int
	var current_total int
	var max_total int

	max_total = 0
	for scanner.Scan() {
		num, err := strconv.Atoi(scanner.Text())

		if err == nil {
			current_total += num
		} else {
			// this means we got a newline, I'd guess
			elf_totals = append(elf_totals, current_total)

			if current_total > max_total {
				max_total = current_total
			}

			current_total = 0
		}
	}

	if current_total > 0 {
		elf_totals = append(elf_totals, current_total)
		if current_total > max_total {
			max_total = current_total
		}
	}

	file.Close()

	fmt.Println("Maximum food value is", max_total)
	sort.Slice(elf_totals, func(i, j int) bool {
		return elf_totals[i] > elf_totals[j]
	})
	fmt.Println("Top three items are", elf_totals[0:3])
	fmt.Println("which adds to", elf_totals[0]+elf_totals[1]+elf_totals[2])
}