package main

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

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

type beam int
type beams struct {
	b map[beam]struct{}
}

func (b *beams) add(pos beam) {
	b.b[pos] = {}
}

func main() {

	file, err := os.Open("five.txt")
	check(err)
	defer file.Close()

	scanner := bufio.NewScanner(file)
	scanner.Scan()

	text := scanner.Text()

	start := strings.IndexRune(text, 'S')
	beams.add(beam(start))

	for scanner.Scan() {
	}
	db, err := parse(scanner)

	check(err)

	nRaw := len(db.ranges)

	for {
		before, after := db.collapse()

		fmt.Printf("Collapsed %d to %d ranges\n", before, after)

		if before == after {
			break
		}
	}

	potentialNFresh := 0
	for _, r := range db.ranges {
		potentialNFresh += r.nInRange()
	}

	fmt.Printf(
		"N raw %d and consolidated %d. %d potential fresh ingredients.\n",
		nRaw,
		len(db.ranges),
		potentialNFresh,
	)
}