// SPDX-License-Identifier: BUSL-1.1
//
// Copyright (C) 2025, Berachain Foundation. All rights reserved.
// Use of this software is governed by the Business Source License included
// in the LICENSE file of this repository and at www.mariadb.com/bsl11.
//
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// LICENSOR AS EXPRESSLY REQUIRED BY THIS LICENSE).
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package zero

import "github.com/berachain/beacon-kit/primitives/crypto/sha256"

// NumZeroHashes is the number of pre-computed zero-hashes.
const NumZeroHashes = 64

// Hashes is a pre-computed list of zero-hashes for each depth level.
//
//nolint:gochecknoglobals // saves recomputing.
var Hashes [NumZeroHashes + 1][32]byte

// InitZeroHashes the zero-hashes pre-computed data
// with the given hash-function.
func InitZeroHashes(zeroHashesLevels int) {
	v := [64]byte{}
	for i := range zeroHashesLevels {
		copy(v[:32], Hashes[i][:])
		copy(v[32:], Hashes[i][:])
		Hashes[i+1] = sha256.Hash(v[:])
	}
}

//nolint:gochecknoinits // saves recomputing.
func init() {
	InitZeroHashes(NumZeroHashes)
}
