package one

import (
	"bufio"
	"io"
	"regexp"

	log "github.com/sirupsen/logrus"
)

var reStartPos = regexp.MustCompile(`0`)

func parseLines(r io.Reader) (*graph, error) {
	graph := newGrid()

	var linecount int
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		line := scanner.Text()

		graph.data = append(graph.data, line)
		for _, m := range reStartPos.FindAllStringIndex(line, -1) {
			graph.startPositions = append(
				graph.startPositions,
				point{x: m[0], y: linecount},
			)
		}

		linecount++
	}

	log.Debug(graph.startPositions)

	if err := scanner.Err(); err != nil {
		return nil, err
	}

	return graph, nil
}

func replaceAtIndex(s string, r rune, i int) string {
	out := []rune(s)
	out[i] = r
	return string(out)
}