# -*- coding: utf-8 -*-
# Copyright 2010-2015, Google Inc.
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#
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# modification, are permitted provided that the following conditions are
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#     * Redistributions of source code must retain the above copyright
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"""Pre-generate XML data of ibus-mozc engines.

We don't support --xml command line option in the ibus-engines-mozc command
since it could make start-up time of ibus-daemon slow when XML cache of the
daemon in ~/.cache/ibus/bus/ is not ready or is expired.
"""

__author__ = "yusukes"

import optparse
import os
import subprocess
import sys

# Information to generate <component> part of mozc.xml. %s will be replaced with
# a product name, 'Mozc' or 'Google Japanese Input'.
IBUS_COMPONENT_PROPS = {
    'name': 'com.google.IBus.Mozc',
    'description': '%(product_name)s Component',
    'exec': '%(ibus_mozc_path)s --ibus',
    # TODO(mazda): Generate the version number.
    'version': '0.0.0.0',
    'author': 'Google Inc.',
    'license': 'New BSD',
    'homepage': 'http://code.google.com/p/mozc/',
    'textdomain': 'ibus-mozc',
}

# Information to generate <engines> part of mozc.xml.
IBUS_ENGINE_COMMON_PROPS = {
    'description': '%(product_name)s (Japanese Input Method)',
    'language': 'ja',
    'icon': '%(ibus_mozc_icon_path)s',
    'rank': '80',
}

# Information to generate <engines> part of mozc.xml for IBus 1.5 or later.
IBUS_1_5_ENGINE_COMMON_PROPS = {
    'description': '%(product_name)s (Japanese Input Method)',
    'language': 'ja',
    'icon': '%(ibus_mozc_icon_path)s',
    'rank': '80',
    'symbol': '&#x3042;',
}

# A dictionary from platform to engines that are used in the platform. The
# information is used to generate <engines> part of mozc.xml.
IBUS_ENGINES_PROPS = {
    # On Linux, we provide only one engine for the Japanese keyboard layout.
    'Linux': {
        # DO NOT change the engine name 'mozc-jp'. The names is referenced by
        # unix/ibus/mozc_engine.cc.
        'name': ['mozc-jp'],
        'longname': ['%(product_name)s'],
        'layout': ['jp'],
    },
    # On Linux (IBus >= 1.5), we use special label 'default' for the keyboard
    # layout.
    'Linux-IBus1.5': {
        # DO NOT change the engine name 'mozc-jp'. The names is referenced by
        # unix/ibus/mozc_engine.cc.
        'name': ['mozc-jp'],
        'longname': ['%(product_name)s'],
        'layout': ['default'],
    },
}

# A dictionary from --branding to a product name which is embedded into the
# properties above.
PRODUCT_NAMES = {
    'Mozc': 'Mozc',
    'GoogleJapaneseInput': 'Google Japanese Input',
}

CPP_HEADER = """// Copyright 2010 Google Inc. All Rights Reserved.

#ifndef %s
#define %s
namespace {"""

CPP_FOOTER = """}  // namespace
#endif  // %s"""


def OutputXmlElement(param_dict, element_name, value):
  print '  <%s>%s</%s>' % (element_name, (value % param_dict), element_name)


def OutputXml(param_dict, component, engine_common, engines, setup_arg):
  """Outputs a XML data for ibus-daemon.

  Args:
    param_dict: A dictionary to embed options into output string.
        For example, {'product_name': 'Mozc'}.
    component: A dictionary from a property name to a property value of the
        ibus-mozc component. For example, {'name': 'com.google.IBus.Mozc'}.
    engine_common: A dictionary from a property name to a property value that
        are commonly used in all engines. For example, {'language': 'ja'}.
    engines: A dictionary from a property name to a list of property values of
        engines. For example, {'name': ['mozc-jp', 'mozc', 'mozc-dv']}.
  """
  print '<component>'
  for key in component:
    OutputXmlElement(param_dict, key, component[key])
  print '<engines>'
  for i in range(len(engines['name'])):
    print '<engine>'
    for key in engine_common:
      OutputXmlElement(param_dict, key, engine_common[key])
    if setup_arg:
      OutputXmlElement(param_dict, 'setup', ' '.join(setup_arg))
    for key in engines:
      OutputXmlElement(param_dict, key, engines[key][i])
    print '</engine>'
  print '</engines>'
  print '</component>'


def OutputCppVariable(param_dict, prefix, variable_name, value):
  print 'const char k%s%s[] = "%s";' % (prefix, variable_name.capitalize(),
                                        (value % param_dict))


def OutputCpp(param_dict, component, engine_common, engines):
  """Outputs a C++ header file for mozc/unix/ibus/main.cc.

  Args:
    param_dict: see OutputXml.
    component: ditto.
    engine_common: ditto.
    engines: ditto.
  """
  guard_name = 'MOZC_UNIX_IBUS_MAIN_H_'
  print CPP_HEADER % (guard_name, guard_name)
  for key in component:
    OutputCppVariable(param_dict, 'Component', key, component[key])
  for key in engine_common:
    OutputCppVariable(param_dict, 'Engine', key, engine_common[key])
  for key in engines:
    print 'const char* kEngine%sArray[] = {' % key.capitalize()
    for i in range(len(engines[key])):
      print '"%s",' % (engines[key][i] % param_dict)
    print '};'
  print 'const size_t kEngineArrayLen = %s;' % len(engines['name'])
  print CPP_FOOTER % guard_name


def IsIBus15OrGreater(options):
  """Returns True when the version of ibus-1.0 is 1.5 or greater."""
  command_line = [options.pkg_config_command, '--exists',
                  'ibus-1.0 >= 1.5.0']
  return_code = subprocess.call(command_line)
  if return_code == 0:
    return True
  else:
    return False


def main():
  """The main function."""
  parser = optparse.OptionParser(usage='Usage: %prog [options]')
  parser.add_option('--output_cpp', action='store_true',
                    dest='output_cpp', default=False,
                    help='If specified, output a C++ header. Otherwise, output '
                    'XML.')
  parser.add_option('--branding', dest='branding', default=None,
                    help='GoogleJapaneseInput for the official build. '
                    'Otherwise, Mozc.')
  parser.add_option('--ibus_mozc_path', dest='ibus_mozc_path', default='',
                    help='The absolute path of ibus_mozc executable.')
  parser.add_option('--ibus_mozc_icon_path', dest='ibus_mozc_icon_path',
                    default='', help='The absolute path of ibus_mozc icon.')
  parser.add_option('--server_dir', dest='server_dir', default='',
                    help='The absolute directory path to be installed the '
                    'server executable.')
  parser.add_option('--pkg_config_command', dest='pkg_config_command',
                    default='pkg-config',
                    help='The path to pkg-config command.')
  (options, unused_args) = parser.parse_args()

  setup_arg = []
  setup_arg.append(os.path.join(options.server_dir, 'mozc_tool'))
  setup_arg.append('--mode=config_dialog')
  if IsIBus15OrGreater(options):
    # A tentative workaround against IBus 1.5
    platform = 'Linux-IBus1.5'
    common_props = IBUS_1_5_ENGINE_COMMON_PROPS
  else:
    platform = 'Linux'
    common_props = IBUS_ENGINE_COMMON_PROPS

  param_dict = {'product_name': PRODUCT_NAMES[options.branding],
                'ibus_mozc_path': options.ibus_mozc_path,
                'ibus_mozc_icon_path': options.ibus_mozc_icon_path}

  if options.output_cpp:
    OutputCpp(param_dict, IBUS_COMPONENT_PROPS, common_props,
              IBUS_ENGINES_PROPS[platform])
  else:
    OutputXml(param_dict, IBUS_COMPONENT_PROPS, common_props,
              IBUS_ENGINES_PROPS[platform], setup_arg)
  return 0

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