package main

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

func readLines(filename string) []string {
	raw, err := os.ReadFile(filename)
	if err != nil {
		panic(err)
	}
	return strings.Split(string(raw), "\n")
}

func parseLine(line string) (int, error) {
	var c int
	switch {
	case strings.HasPrefix(line, "R"):
		c = 1
	case strings.HasPrefix(line, "L"):
		c = -1
	default:
		return 0, fmt.Errorf("invalid line")
	}
	x, err := strconv.Atoi(line[1:])
	if err != nil {
		return c, err
	}
	if x <= 0 {
		return x, fmt.Errorf("non-positive value")
	}
	return c * x, nil
}

func countZeros(lines []string) int {
	count := 0
	current := 50
	max := 100
	for _, line := range lines {
		if line == "" {
			continue
		}
		x, err := parseLine(line)
		if err != nil {
			panic(err)
		}
		current = (current + x) % max
		if current == 0 {
			count++
		}
	}
	return count
}

func countClicks(lines []string) int {
	count := 0
	current := 50
	max := 100
	for _, line := range lines {
		if line == "" {
			continue
		}
		x, err := parseLine(line)
		if err != nil {
			panic(err)
		}
		for {
			if x > 0 {
				x--
				current++
				if current == 0 || current == max {
					count++
					current = 0
				}
			} else if x < 0 {
				x++
				current--
				if current == 0 || current == -max {
					count++
					current = 0
				}
			} else {
				break
			}
		}
	}
	return count
}

func main() {
	lines := readLines("part1.txt")
	println(countZeros(lines))
	println(countClicks(lines))
}