// (c) 2021-2022, Lux Partners Limited. All rights reserved.
// See the file LICENSE for licensing terms.

package utils

import "github.com/ethereum/go-ethereum/common"

// IncrOne increments bytes value by one
func IncrOne(bytes []byte) {
	index := len(bytes) - 1
	for index >= 0 {
		if bytes[index] < 255 {
			bytes[index]++
			break
		} else {
			bytes[index] = 0
			index--
		}
	}
}

// HashSliceToBytes serializes a []common.Hash into a tightly packed byte array.
func HashSliceToBytes(hashes []common.Hash) []byte {
	bytes := make([]byte, common.HashLength*len(hashes))
	for i, hash := range hashes {
		copy(bytes[i*common.HashLength:], hash[:])
	}
	return bytes
}

// BytesToHashSlice packs [b] into a slice of hash values with zero padding
// to the right if the length of b is not a multiple of 32.
func BytesToHashSlice(b []byte) []common.Hash {
	var (
		numHashes = (len(b) + 31) / 32
		hashes    = make([]common.Hash, numHashes)
	)

	for i := range hashes {
		start := i * common.HashLength
		copy(hashes[i][:], b[start:])
	}
	return hashes
}