"""
Copyright 2023 Balázs Dukai, Ravi Peters

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import json
import os, sys
from pathlib import Path

TILESET_DIR = Path("/dev/shm/3dtiles-buildings")

# filename = TILESET_DIR / "tileset_og.json"
# output = TILESET_DIR / "tileset.json"

filename = sys.argv[1]
output = sys.argv[2]

TILESET_DIR = Path(filename).parent
print(TILESET_DIR)

def remove_empty_leafs(node):
  if node.get("children"):
    # print("node has {} children".format(len(node["children"])))
    # print(node["children"])
    new_children = []
    for child in node["children"]:
      if child.get("content"):
        # print("checking " + str(TILESET_DIR / child["content"]["uri"]))
        if(os.path.exists(TILESET_DIR / child["content"]["uri"])):
          new_children.append(child)
          # print("exists")
      else:
        new_children.append(child)
    if len(new_children) == 0:
      del node["children"]
    else:
      node["children"] = new_children
    # print(node["children"])
      for child in node["children"]:
        remove_empty_leafs(child)

with open(filename, "r") as in_file:
    tileset = json.load(in_file)

remove_empty_leafs(tileset["root"])

with open(output, "w") as file:
    json.dump(tileset, file)