package main

import (
	"fmt"
	"os"
	"strings"

	"git.annabunch.es/annabunches/adventofcode/2020/lib/util"
)

func countAnswerUnion(input string) int {
	charMap := make(map[rune]bool)

	for _, char := range input {
		if char == ' ' {
			continue
		}

		if _, ok := charMap[char]; !ok {
			charMap[char] = true
		}
	}
	return len(charMap)
}

func countAnswerIntersection(input string) int {
	charMap := make(map[rune]int)
	answers := strings.Split(strings.Trim(input, " "), " ")

	for _, answer := range answers {
		for _, char := range answer {
			charMap[char]++
		}
	}

	total := 0
	for _, count := range charMap {
		if count == len(answers) {
			total++
		}
	}
	return total
}

func main() {
	step := os.Args[1]
	values := util.InputParserStrings(os.Args[2])
	groups := util.SplitOnBlankLine(values)

	total := 0
	for _, line := range groups {
		if step == "1" {
			total += countAnswerUnion(line)
		}
		if step == "2" {
			total += countAnswerIntersection(line)
		}
	}
	fmt.Println("Total:", total)
}