gistfile1.txt

import base64
import json
import zlib


directions = {
    0: "N",
    1: "NE",
    2: "E",
    3: "SE",
    4: "S",
    5: "SW",
    6: "W",
    7: "NW"
}

bp_str = None
ori = "x"
    
bp_str = bp_str or input("Enter the blueprint string: ")
ori = ori or input("Enter flip direction (H/V): ")

version = bp_str[0]
bp_str = bp_str[1:]

if version != "0":
    raise Exception("Unsupported version: %s" % version)

data = base64.b64decode(bp_str)
data = zlib.decompress(data)
data = json.loads(data)

print(json.dumps(data, indent=4))

if "blueprint" not in data:
    raise Exception("Invalid blueprint.")

if ori.lower() in ["x", "h"]:
    ori = "x"
elif ori.lower() in ["y", "v"]:
    ori = "y"
else:
    raise Exception("Invalid flip direction.")


entities = data["blueprint"].get("entities",  [])
for entity in entities:
    if "position" in entity:
        entity["position"][ori] = entity["position"][ori] * -1

        rotation = entity.get("direction", 0)

        if entity.get("name") == "storage-tank" and ori == "x":
            pass
        if entity.get("name") == "curved-rail":
            switches = {
                "x": [(0, 1), (3, 6), (5, 4), (2, 7)],
                "y": [(0, 5), (3, 2), (6, 7), (1, 4)]
            }
            for sw in switches.get(ori):
                if rotation == sw[0]:
                    rotation = sw[1]
                elif rotation == sw[1]:
                    rotation = sw[0]
                else:
                    continue
                break
        else:
            if rotation not in ([0, 4] if ori == "x" emlse [2, 6]):
                rotation = (rotation + 4) % 8

        entity["direction"] = rotation
        
        
data = json.dumps(data).encode()
data = zlib.compress(data)
data = base64.b64encode(data)

print("Output: 0%s" % data.decode())