import hashlib
import os.path

import modules.cache
from modules import shared

dump_cache = modules.cache.dump_cache
cache = modules.cache.cache


def calculate_sha256_real(filename: os.PathLike):
    with open(filename, "rb") as f:
        return hashlib.file_digest(f, "sha256").hexdigest()


calculate_sha256 = calculate_sha256_real


def sha256_from_cache(filename: os.PathLike, title: str, use_addnet_hash=False):
    hashes = cache("hashes-addnet") if use_addnet_hash else cache("hashes")
    try:
        ondisk_mtime = os.path.getmtime(filename)
    except FileNotFoundError:
        return None

    if title not in hashes:
        return None

    cached_sha256 = hashes[title].get("sha256", None)
    cached_mtime = hashes[title].get("mtime", 0)

    if ondisk_mtime > cached_mtime or cached_sha256 is None:
        return None

    return cached_sha256


def sha256(filename: os.PathLike, title: str, use_addnet_hash=False):
    hashes = cache("hashes-addnet") if use_addnet_hash else cache("hashes")

    sha256_value = sha256_from_cache(filename, title, use_addnet_hash)
    if sha256_value is not None:
        return sha256_value

    if shared.cmd_opts.no_hashing:
        return None

    print(f"Calculating sha256 for {filename}: ", end="", flush=True)
    sha256_value = calculate_sha256_real(filename)
    print(sha256_value)

    hashes[title] = {
        "mtime": os.path.getmtime(filename),
        "sha256": sha256_value,
    }

    dump_cache()

    return sha256_value


def addnet_hash_safetensors(b):
    """kohya-ss hash for safetensors from https://github.com/kohya-ss/sd-scripts/blob/main/library/train_util.py"""
    hash_sha256 = hashlib.sha256()
    blksize = 1024 * 1024

    b.seek(0)
    header = b.read(8)
    n = int.from_bytes(header, "little")

    offset = n + 8
    b.seek(offset)
    for chunk in iter(lambda: b.read(blksize), b""):
        hash_sha256.update(chunk)

    return hash_sha256.hexdigest()