from pathlib import Path

# Define the content for hbb_blockchain.py
hbb_blockchain_code = '''"""
Hypercube-Based Blockchain (HBB)
Implements a 4D blockchain ledger where each node represents a hypercube cell.
Uses SHAKE256 for hyperdimensional integrity.
"""

import hashlib
import time
import json


class HyperBlock:
    def __init__(self, index, timestamp, data, previous_hash, tesseract_hash):
        self.index = index
        self.timestamp = timestamp
        self.data = data
        self.previous_hash = previous_hash
        self.tesseract_hash = tesseract_hash
        self.hash = self.compute_hash()

    def compute_hash(self):
        block_string = json.dumps({
            "index": self.index,
            "timestamp": self.timestamp,
            "data": self.data,
            "previous_hash": self.previous_hash,
            "tesseract_hash": self.tesseract_hash
        }, sort_keys=True).encode()
        return hashlib.shake_256(block_string).hexdigest(64)


class HypercubeBlockchain:
    def __init__(self):
        self.chain = []
        self.create_genesis_block()

    def create_genesis_block(self):
        genesis_block = HyperBlock(0, time.time(), "Genesis Block", "0", "0")
        self.chain.append(genesis_block)

    def add_block(self, data, tesseract_hash):
        prev_block = self.chain[-1]
        new_block = HyperBlock(len(self.chain), time.time(), data, prev_block.hash, tesseract_hash)
        self.chain.append(new_block)
        return new_block

    def is_valid(self):
        for i in range(1, len(self.chain)):
            curr = self.chain[i]
            prev = self.chain[i - 1]
            if curr.hash != curr.compute_hash() or curr.previous_hash != prev.hash:
                return False
        return True
'''

# Write the hbb_blockchain.py file
src_dir = Path("src")
src_dir.mkdir(parents=True, exist_ok=True)
hbb_path = src_dir / "hbb_blockchain.py"
hbb_path.write_text(hbb_blockchain_code)

"hbb_blockchain.py has been created successfully."
