import hashlib
import os

# import time
from rq import get_current_job

BLOCKSIZE = 65535


def check_hash(algorithm, filename, hashval):
    job = get_current_job()
    if job:
        job.meta["status"] = "Processing: 0%"
        job.save_meta()

        if filename == "" or hashval == "":
            return "ERROR: Invalid Arguents"

        if algorithm == "sha256":
            hashfunc = hashlib.sha256()
        else:
            return "ERROR: Unknown Algorithm"

        filesize = os.path.getsize(filename)
        filepos = 0
        with open(filename, "rb") as f:
            file_buffer = f.read(BLOCKSIZE)
            filepos += len(file_buffer)
            job.meta["status"] = "Processing: {}%".format(filepos / filesize * 100)
            job.save_meta()
            while len(file_buffer) > 0:
                hashfunc.update(file_buffer)
                file_buffer = f.read(BLOCKSIZE)

        job.meta["status"] = "Processing: {}%".format(filesize / filesize * 100)
        job.save_meta()

        # time.sleep(5)

        if hashfunc.hexdigest() == hashval:
            job.meta["status"] = "OK: Hash Value Matches"
        else:
            job.meta["status"] = "FAILED: Invalid Hash"

        job.save_meta()