import os
import ycm_core
from clang_helpers import PrepareClangFlags

compilation_database_folder = ''

flags = [
'-include',
'./config.h',
'-I',
'/usr/include/dbus-1.0',
'-I',
'./src/shared',
'-Wall',
'-Wextra',
'-Werror',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-DUSE_CLANG_COMPLETER',
'-D_GNU_SOURCE',
'-std=c99',
]

if compilation_database_folder:
  database = ycm_core.CompilationDatabase(compilation_database_folder)
else:
  database = None


def DirectoryOfThisScript():
  return os.path.dirname(os.path.abspath(__file__))


def MakeRelativePathsInFlagsAbsolute(flags, working_directory):
  if not working_directory:
    return flags
  new_flags = []
  make_next_absolute = False
  path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
  for flag in flags:
    new_flag = flag

    if make_next_absolute:
      make_next_absolute = False
      if not flag.startswith('/'):
        new_flag = os.path.join(working_directory, flag)

    for path_flag in path_flags:
      if flag == path_flag:
        make_next_absolute = True
        break

      if flag.startswith(path_flag):
        path = flag[ len(path_flag): ]
        new_flag = path_flag + os.path.join(working_directory, path)
        break

    if new_flag:
      new_flags.append(new_flag)
  return new_flags


def FlagsForFile(filename):
  if database:
    compilation_info = database.GetCompilationInfoForFile(filename)
    final_flags = PrepareClangFlags(
        MakeRelativePathsInFlagsAbsolute(
            compilation_info.compiler_flags_,
            compilation_info.compiler_working_dir_),
        filename)

  else:
    relative_to = DirectoryOfThisScript()
    final_flags = MakeRelativePathsInFlagsAbsolute(flags, relative_to)

  return {
    'flags': final_flags,
    'do_cache': True
  }