package main

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

var _ = strings.NewReader

func openf(path string) io.Reader {
	f, err := os.Open(path)
	if err != nil {
		panic(err)
	}
	return f
}

func main() {
	i := openf("inputs/0101.txt")
	_ = i
	t := strings.NewReader(`L68
L30
R48
L5
R60
L55
L1
L99
R14
L82
`)

	//fmt.Println(puzzle_0101(i))
	fmt.Println(puzzle_0102(t))
	fmt.Println(puzzle_0102(i))
}

func puzzle_0101(r io.Reader) string {

	turn := func(position, distance int) int {
		n := position + distance
		for n > 99 {
			n -= 100
		}

		for n < 0 {
			n += 100
		}
		return n
	}

	p := 50
	var total int
	s := bufio.NewScanner(r)
	for s.Scan() {
		if p == 0 {
			total++
		}

		l := s.Text()
		dir, dig := l[0], l[1:]
		n, _ := strconv.Atoi(dig)
		switch dir {
		case 'R':
		case 'L':
			n = -n
		}

		p = turn(p, n)

	}
	return strconv.Itoa(total)
}

func puzzle_0102(r io.Reader) string {

	turnR := func(position, distance int) (pos, clicks int) {
		clicks = distance / 100
		r := distance % 100
		pos = position + r
		if pos > 99 {
			pos = pos-100
			if pos != 0 {
			clicks++
}
		}
		return pos, clicks
	}

	turnL := func(position, distance int) (pos, clicks int) {
		clicks = distance / 100
		r := distance % 100
		pos = position - r
		if pos < 0 {
			pos = 100+pos
			if position != 0 {
			clicks++
}
		}

		return pos, clicks
	}

	p := 50
	var total, clicks int
	s := bufio.NewScanner(r)
	for s.Scan() {
		l := s.Text()
		dir, dig := l[0], l[1:]
		n, _ := strconv.Atoi(dig)
		switch dir {
		case 'R':
			p, clicks = turnR(p, n)
		case 'L':
			p, clicks = turnL(p, n)
		}

		total += clicks
		if p == 0 { total++ }

		//fmt.Printf("INST %s, POS %d, CLICKS %d, TOTAL %d\n", l, p, clicks, total)

	}
	return strconv.Itoa(total)
}