# Copyright (c) 2011 The Chromium Embedded Framework Authors. All rights
# reserved. Use of this source code is governed by a BSD-style license that
# can be found in the LICENSE file.

from __future__ import absolute_import
from cef_parser import *


def make_cpptoc_header(header, clsname):
  cls = header.get_class(clsname)
  if cls is None:
    raise Exception('Class does not exist: ' + clsname)

  dllside = cls.is_library_side()

  directory = cls.get_file_directory()
  defname = ''
  if not directory is None:
    defname += directory + '_'
  defname += get_capi_name(clsname[3:], False)
  defname = defname.upper()

  capiname = cls.get_capi_name()

  result = get_copyright()

  result += '#ifndef CEF_LIBCEF_DLL_CPPTOC_'+defname+'_CPPTOC_H_\n'+ \
            '#define CEF_LIBCEF_DLL_CPPTOC_'+defname+'_CPPTOC_H_\n' + \
            '#pragma once\n'

  if dllside:
    result += """
#if !defined(BUILDING_CEF_SHARED)
#error This file can be included DLL-side only
#endif
"""
  else:
    result += """
#if !defined(WRAPPING_CEF_SHARED)
#error This file can be included wrapper-side only
#endif
"""

  # include the headers for this class
  result += '\n#include "include/'+cls.get_file_name()+'"\n' \
            '#include "include/capi/'+cls.get_capi_file_name()+'"\n'

  # include headers for any forward declared classes that are not in the same file
  declares = cls.get_forward_declares()
  for declare in declares:
    dcls = header.get_class(declare)
    if dcls.get_file_name() != cls.get_file_name():
      result += '#include "include/'+dcls.get_file_name()+'"\n' \
                '#include "include/capi/'+dcls.get_capi_file_name()+'"\n'

  base_class_name = header.get_base_class_name(clsname)
  base_scoped = True if base_class_name == 'CefBaseScoped' else False
  if base_scoped:
    template_file = 'cpptoc_scoped.h'
    template_class = 'CefCppToCScoped'
  else:
    template_file = 'cpptoc_ref_counted.h'
    template_class = 'CefCppToCRefCounted'

  result += '#include "libcef_dll/cpptoc/' + template_file + '"'
  result += '\n\n// Wrap a C++ class with a C structure.\n'

  if dllside:
    result += '// This class may be instantiated and accessed DLL-side only.\n'
  else:
    result += '// This class may be instantiated and accessed wrapper-side only.\n'

  result +=  'class '+clsname+'CppToC\n'+ \
             '    : public ' + template_class + '<'+clsname+'CppToC, '+clsname+', '+capiname+'> {\n'+ \
             ' public:\n'+ \
             '  '+clsname+'CppToC();\n'+ \
             '  virtual ~'+clsname+'CppToC();\n'+ \
             '};\n\n'

  result += '#endif  // CEF_LIBCEF_DLL_CPPTOC_' + defname + '_CPPTOC_H_'

  return result


def write_cpptoc_header(header, clsname, dir):
  # give the output file the same directory offset as the input file
  cls = header.get_class(clsname)
  dir = os.path.dirname(os.path.join(dir, cls.get_file_name()))
  file = os.path.join(dir, get_capi_name(clsname[3:], False) + '_cpptoc.h')

  newcontents = make_cpptoc_header(header, clsname)
  return (file, newcontents)


# test the module
if __name__ == "__main__":
  import sys

  # verify that the correct number of command-line arguments are provided
  if len(sys.argv) < 3:
    sys.stderr.write('Usage: ' + sys.argv[0] + ' <infile> <classname>')
    sys.exit()

  # create the header object
  header = obj_header()
  header.add_file(sys.argv[1])

  # dump the result to stdout
  sys.stdout.write(make_cpptoc_header(header, sys.argv[2]))