package utils

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"
)

func PanicOnErr(err error) {
	if err != nil {
		panic(err)
	}
}

func MustAtoi(s string) int {
	v, err := strconv.Atoi(s)
	PanicOnErr(err)
	return v
}

func Readfile(day int, example bool) string {
	filename := fmt.Sprintf("input/day%02d.txt", day)
	if example {
		filename = fmt.Sprintf("input/day%02d_example.txt", day)
	}
	file, err := os.Open(filename)
	PanicOnErr(err)
	defer file.Close()

	reader := bufio.NewReader(file)
	contents, err := io.ReadAll(reader)
	PanicOnErr(err)

	return strings.TrimSuffix(string(contents), "\n")
}