import zlib
import pathlib
from typing import List

from .config import config
import os
import datetime


def crc32(bytes_in: bytes) -> int:
    return zlib.crc32(bytes_in, 0) & 0xffffffff


def map_file_to_dict(map_file: pathlib.Path) -> dict:
    with open(map_file, "rb") as fp:
        content = fp.read()
        crc = crc32(content)

    return {
        "crc": crc,
        "crc_human": hex(crc)[2:].upper(),
        "name": map_file.name,
        "size": os.stat(map_file).st_size,
        "upload_date": datetime.datetime.fromtimestamp(os.stat(map_file).st_ctime),
        "blob_location": f"{config['base_url']}/{config['upload_path']}{map_file.name}"
    }


def read_all_maps() -> List[dict]:
    print("reading all maps")
    maps = []
    for file in os.listdir(config["upload_path"]):
        maps.append(map_file_to_dict(pathlib.Path(config["upload_path"] + "/" + file)))
    return maps