#!/usr/bin/env python3
# Copyright 2021 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
This script finds the SetEnv.*.json file from an unpacked Windows SDK.
"""

import argparse
import os
import sys

POSSIBLE_BASE_LOCATIONS = [
  # Older SDKs just used the raw 'bin' directory
  os.path.join("win_sdk", "bin"),
  # SDK versions after 19041
  os.path.join("Windows Kits", "10", "bin"),
]

SDK_ARCHITECTURES = frozenset(
  [
    "x86",
    "x64",
    "arm64",
  ]
)


def main():
  parser = argparse.ArgumentParser(
    description="Find the SetEnv from a windows SDK"
  )
  parser.add_argument(
    "--sdk_root",
    metavar="PATH",
    required=True,
    help="The absolute path to the root of the unpacked SDK",
  )
  parser.add_argument(
    "--target_arch",
    choices=SDK_ARCHITECTURES,
    required=True,
    help="The target architecture",
  )
  parser.add_argument(
    "--output_json",
    required=True,
    help="The absolute path to an output json file",
  )
  args = parser.parse_args()

  if not os.path.isabs(args.sdk_root):
    parser.error("sdk_root must be absolute, got {!r}".format(args.sdk_root))

  if not os.path.isabs(args.output_json):
    parser.error(
      "output_json must be absolute, got {!r}".format(args.output_json)
    )

  with open(args.output_json, "w", encoding="utf-8") as outf:
    tail = "SetEnv.{}.json".format(args.target_arch)
    for loc in POSSIBLE_BASE_LOCATIONS:
      full = os.path.join(args.sdk_root, loc, tail)
      print("Attempting:", full)
      try:
        with open(full, encoding="utf-8") as set_env_json:
          print(">  Found it!")
          outf.write(set_env_json.read())
          return
      except OSError as ex:
        print(">  Failed:", ex)
        continue

  print("Unable to locate SetEnv file")
  sys.exit(1)


if __name__ == "__main__":
  main()