#!/usr/bin/env python3
# Copyright (C) 2021 The Android Open Source Project
#
# 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.

"""Generates TypeScript files that import all subdirectories.
This is useful for plugins/extensions. If you have two modules:
- core/
- plugins/myplugin/
In general you would like the dependency to only go one way:
- plugins/myplugin/ -> core/
But you still need some index file to import all plugins for the sake of
bundling. This avoids having to manually edit core/ for every
plugin you add.
"""

from __future__ import print_function

import os
import argparse
import subprocess
import sys

ROOT_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
UI_SRC_DIR = os.path.join(ROOT_DIR, 'ui', 'src')

def gen_imports(input_dir, output_path):
  paths = [os.path.join(input_dir, p) for p in os.listdir(input_dir)]
  paths = [p for p in paths if os.path.isdir(p)]
  paths.sort()

  lines = []
  for path in paths:
    rel_path = os.path.relpath(path, os.path.dirname(output_path))
    lines.append(f"import '{rel_path}';")
  expected = '\n'.join(lines)

  with open(output_path, 'w') as f:
    f.write(expected)
  return True

def main():
  parser = argparse.ArgumentParser(description=__doc__,
      formatter_class=argparse.RawDescriptionHelpFormatter)
  parser.add_argument('INPUT')
  parser.add_argument('--out', required=True)
  args = parser.parse_args()
  input_dir = args.INPUT
  output_path = args.out

  if not os.path.isdir(input_dir):
    print(f'INPUT argument {input_dir} must be a directory')
    exit(1)

  output_dir = os.path.dirname(output_path)
  if output_dir and not os.path.isdir(output_dir):
    print(f'--out ({output_path}) parent directory ({output_dir}) must exist')
    exit(1)
  if os.path.isdir(output_path):
    print(f'--out ({output_path}) should not be a directory')
    exit(1)

  success = gen_imports(input_dir, output_path)
  return 0 if success else 1

if __name__ == '__main__':
  exit(main())