"""
Blake3 Hash Utilities

Provides Blake3 hash computation for file integrity verification.
"""

from typing import Union


def compute_blake3(content: bytes) -> str:
    """
    Compute Blake3 hash of content.
    
    Args:
        content: File bytes
    
    Returns:
        Hex string (lowercase)
        
    Raises:
        ImportError: If blake3 module not installed
    """
    try:
        import blake3
    except ImportError:
        raise ImportError(
            "blake3 module not installed. Install with: pip install blake3"
        )
    
    hasher = blake3.blake3()
    hasher.update(content)
    return hasher.hexdigest()


def verify_blake3(content: bytes, expected_hash: str) -> bool:
    """
    Verify Blake3 hash of content.
    
    Args:
        content: File bytes
        expected_hash: Expected hex hash (lowercase)
    
    Returns:
        True if hash matches, False otherwise
    """
    computed = compute_blake3(content)
    return computed.lower() == expected_hash.lower()