pub fn sha3_384_hash(data: Bytes) -> Hash {
    return Hash::sha3_384(data);
}

pub fn sha3_384_hash_string(data: String) -> Hash {
    return Hash::sha3_384(data.as_bytes());
}

pub fn sha3_384_hash_multiple(data_list: Vec<Bytes>) -> Hash {
    let mut combined = Bytes::new();
    for data in data_list {
        combined.extend(data);
    }
    return Hash::sha3_384(combined);
}

pub fn address_from_public_key(public_key: Bytes) -> Address {
    require(public_key.len() == 33 || public_key.len() == 65, "Invalid public key length");
    let hash = sha3_384_hash(public_key);
    return Address::from_hash(hash);
}

pub fn is_valid_address(address: Address) -> bool {
    return !address.is_zero();
}

pub fn verify_ed25519_signature(message: Bytes, signature: Bytes, public_key: Bytes) -> bool {
    require(signature.len() == 64, "Invalid signature length");
    require(public_key.len() == 32, "Invalid public key length");
    return crypto::ed25519_verify(message, signature, public_key);
}

pub fn verify_ecdsa_signature(message_hash: Hash, signature: Bytes, public_key: Bytes) -> bool {
    require(signature.len() == 65, "Invalid signature length");
    require(public_key.len() == 33 || public_key.len() == 65, "Invalid public key length");
    return crypto::ecdsa_verify(message_hash.as_bytes(), signature, public_key);
}

pub fn recover_ecdsa_public_key(message_hash: Hash, signature: Bytes) -> Bytes {
    require(signature.len() == 65, "Invalid signature length");
    return crypto::ecdsa_recover(message_hash.as_bytes(), signature);
}

pub fn create_message_hash(message: String) -> Hash {
    let prefix = "\x19NAC Signed Message:\n";
    let len_str = message.len().to_string();
    let mut full_message = Bytes::from(prefix);
    full_message.extend(Bytes::from(len_str));
    full_message.extend(Bytes::from(message));
    return sha3_384_hash(full_message);
}

pub fn verify_signed_message(message: String, signature: Bytes, signer: Address) -> bool {
    require(signature.len() == 65, "Invalid signature length");
    let message_hash = create_message_hash(message);
    let recovered_pubkey = recover_ecdsa_public_key(message_hash, signature);
    let recovered_address = address_from_public_key(recovered_pubkey);
    return recovered_address == signer;
}

pub fn compute_merkle_root(leaves: Vec<Hash>) -> Hash {
    require(leaves.len() > 0, "Leaves cannot be empty");
    if leaves.len() == 1 {
        return leaves[0];
    }
    let mut current_level = leaves;
    while current_level.len() > 1 {
        let mut next_level = Vec::new();
        let mut i = 0;
        while i < current_level.len() {
            if i + 1 < current_level.len() {
                let combined = Bytes::new();
                combined.extend(current_level[i].as_bytes());
                combined.extend(current_level[i + 1].as_bytes());
                next_level.push(sha3_384_hash(combined));
                i += 2;
            } else {
                let combined = Bytes::new();
                combined.extend(current_level[i].as_bytes());
                combined.extend(current_level[i].as_bytes());
                next_level.push(sha3_384_hash(combined));
                i += 1;
            }
        }
        current_level = next_level;
    }
    return current_level[0];
}

pub fn verify_merkle_proof(leaf: Hash, proof: Vec<Hash>, root: Hash, index: u256) -> bool {
    let mut computed_hash = leaf;
    let mut current_index = index;
    for proof_element in proof {
        let combined = Bytes::new();
        if current_index % 2 == 0 {
            combined.extend(computed_hash.as_bytes());
            combined.extend(proof_element.as_bytes());
        } else {
            combined.extend(proof_element.as_bytes());
            combined.extend(computed_hash.as_bytes());
        }
        computed_hash = sha3_384_hash(combined);
        current_index = current_index / 2;
    }
    return computed_hash == root;
}

pub fn pseudo_random(seed: Bytes) -> u256 {
    let hash = sha3_384_hash(seed);
    return u256::from_bytes(hash.as_bytes());
}

pub fn pseudo_random_from_block() -> u256 {
    let mut seed = Bytes::new();
    seed.extend(block.hash.as_bytes());
    seed.extend(block.timestamp.to_bytes());
    seed.extend(tx.hash.as_bytes());
    return pseudo_random(seed);
}

pub fn base58_encode(data: Bytes) -> String {
    const ALPHABET: &str = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
    return crypto::base58_encode(data);
}

pub fn base58_decode(encoded: String) -> Bytes {
    return crypto::base58_decode(encoded);
}

pub fn hex_encode(data: Bytes) -> String {
    return "0x" + data.to_hex();
}

pub fn hex_decode(hex_string: String) -> Bytes {
    let hex = hex_string.trim_start_matches("0x");
    return Bytes::from_hex(hex);
}