#!/usr/bin/env python3
# Copyright 2013 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import os
import stat
import string
import sys


def main():
  parser = argparse.ArgumentParser(
      description='Generate a script that invokes a Dart application'
  )
  parser.add_argument(
      '--out', help='Path to the invocation file to generate', required=True
  )
  parser.add_argument('--dart', help='Path to the Dart binary', required=True)
  parser.add_argument(
      '--snapshot', help='Path to the app snapshot', required=True
  )
  args = parser.parse_args()

  app_file = args.out
  app_path = os.path.dirname(app_file)
  if not os.path.exists(app_path):
    os.makedirs(app_path)

  script_template = string.Template(
      '''#!/bin/sh

$dart \\
  $snapshot \\
  "$$@"
'''
  )
  with open(app_file, 'w') as file:
    file.write(script_template.substitute(args.__dict__))
  permissions = (
      stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR | stat.S_IRGRP | stat.S_IWGRP
      | stat.S_IXGRP | stat.S_IROTH
  )
  os.chmod(app_file, permissions)


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