import hashlib

from fastapi import UploadFile


def convert_bytes(bytes, precision=2):
    """Converts bytes into a human-friendly format."""
    abbreviations = ['B', 'KB', 'MB']
    if bytes <= 0:
        return '0 B'
    size = bytes
    index = 0
    while size >= 1024 and index < len(abbreviations) - 1:
        size /= 1024
        index += 1
    return f'{size:.{precision}f} {abbreviations[index]}'

def get_file_size(file: UploadFile):
    # move the cursor to the end of the file
    file.file._file.seek(0, 2)
    file_size = file.file._file.tell()  # Getting the size of the file
    # move the cursor back to the beginning of the file 
    file.file.seek(0)

    return file_size


def compute_sha1_from_file(file_path):
    with open(file_path, "rb") as file:
        bytes = file.read()
        readable_hash = compute_sha1_from_content(bytes)
    return readable_hash


def compute_sha1_from_content(content):
    readable_hash = hashlib.sha1(content).hexdigest()
    return readable_hash