package group_anagrams

import (
	"hash/maphash"
	"slices"
)

func SortString(s string) string {
	runes := []rune(s)
	slices.Sort(runes)
	return string(runes)
}

func AnagramHash(letters string) uint64 {
	var h maphash.Hash
	h.WriteString(SortString(letters))
	return h.Sum64()
}

func GroupAnagrams(items []string) [][]string {
	anagrams := map[uint64][]string{}

	for _, item := range items {
		hash := AnagramHash(item)
		similar, exists := anagrams[hash]

		if exists {
			anagrams[hash] = append(similar, item)
		} else {
			anagrams[hash] = []string{item}
		}
	}

	result := [][]string{}

	for _, group := range anagrams {
		result = append(result, group)
	}

	return result
}