import heatshrink2
import argparse
import os


def padded_hex(i, l):
    given_int = i
    given_len = l

    hex_result = hex(given_int)[2:]  # remove '0x' from beginning of str
    num_hex_chars = len(hex_result)
    extra_zeros = "0" * (given_len - num_hex_chars)  # may not get used..

    return (
        "0x" + hex_result
        if num_hex_chars == given_len
        else (
            "?" * given_len
            if num_hex_chars > given_len
            else "0x" + extra_zeros + hex_result if num_hex_chars < given_len else None
        )
    )


parser = argparse.ArgumentParser(
    description="Turn cooked Flipper .bm files back into .xbm"
)

parser.add_argument("infile", metavar="i", help="Input file")
parser.add_argument("outfile", metavar="o", help="File to write to")
parser.add_argument(
    "Width",
    metavar="W",
    type=int,
    nargs="?",
    default="128",
    help="Width of the image. Find from meta.txt or directory name",
)
parser.add_argument(
    "Height",
    metavar="H",
    type=int,
    nargs="?",
    default="64",
    help="Height of the image. Find from meta.txt or directory name",
)

args = vars(parser.parse_args())

with open(args["infile"], "rb") as f:
    fileStream = f.read()
filename = os.path.splitext(os.path.basename(args["outfile"]))[0]


imageWidth = args["Width"]
imageHeight = args["Height"]


# remove headers and padding
if fileStream[0:2] == bytes([0x01, 0x00]):
    unpad = fileStream[4:]
else:
    if fileStream[0:1] == bytes([0x00]):
        unpad = fileStream[2:]


# lzss decompress
data_decoded_str = heatshrink2.decompress(unpad, window_sz2=8, lookahead_sz2=4)

# turn it back into xbm

b = list(data_decoded_str)
c = ", ".join(padded_hex(my_int, 2) for my_int in b)

width_out = "#define " + filename + "_width " + str(imageWidth) + "\n"
height_out = "#define " + filename + "_height " + str(imageHeight) + "\n"
bytes_out = "static unsigned char " + filename + "_bits[] = {" + str(c) + "};"

data = width_out + height_out + bytes_out

with open(args["outfile"], "w") as f:
    f.write(data)
