#!/usr/bin/env python
# Copyright 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Usage:
#
#   cd third_party/closure_compiler
#   tools/create_include_gyp.py externs > externs/compiled_resources2.gyp
#   tools/create_include_gyp.py interfaces > interfaces/compiled_resources2.gyp

from datetime import date
import os
import sys


_INCLUDE_GYPI = os.path.join(os.path.dirname(__file__), '..', 'include_js.gypi')


_INCLUDE_TEMPLATE = """
# Copyright %d The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

########################################################
#    NOTE: THIS FILE IS GENERATED. DO NOT EDIT IT!     #
# Instead, run create_include_gyp.py to regenerate it. #
########################################################
{
  'targets': [
    %s,
  ],
}""".lstrip()


_TARGET_TEMPLATE_NO_CHROME_DEPENDENCY = """
    {
      'target_name': '%s',
      'includes': ['%s'],
    }"""

_TARGET_TEMPLATE = """
    {
      'target_name': '%s',
      'dependencies': ['chrome'],
      'includes': ['%s'],
    }"""

# Add externs files that do not depend on chrome.* namespace here. Everything
# else will have chrome.js as a dependency.
NO_CHROME_DEPENDENCY = set([
  'chrome.js',
  'mojo.js',
  'pending.js',
  'polymer-1.0.js',
  'web_animations.js',
])

def CreateIncludeGyp(directory):
  include_path = os.path.normpath(os.path.relpath(_INCLUDE_GYPI, directory))
  js_files = [f for f in os.listdir(directory) if f.endswith('.js')]
  js_files.sort()

  targets = []
  for f in js_files:
    template = (_TARGET_TEMPLATE_NO_CHROME_DEPENDENCY if f in
                NO_CHROME_DEPENDENCY else _TARGET_TEMPLATE)
    targets.append(template % (f[:-3], include_path))
  return _INCLUDE_TEMPLATE % (date.today().year, ",".join(targets).strip())


def ShowUsageAndDie():
  print "usage: tools/create_include_gyp.py externs/ > externs/compiled_resources2.gyp"
  sys.exit(1)


if __name__ == "__main__":
  if len(sys.argv) != 2:
    ShowUsageAndDie()

  print CreateIncludeGyp(sys.argv[1])