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#
# Author:: John Keiser (<jkeiser@opscode.com>)
# Author:: Seth Chisamore (<schisamo@opscode.com>)
# Copyright:: Copyright 2011 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require 'chef/win32/api/unicode'

class Chef
  module ReservedNames::Win32
    class Unicode
      include Chef::ReservedNames::Win32::API::Unicode
      extend Chef::ReservedNames::Win32::API::Unicode
    end
  end
end

module FFI
  class Pointer
    def read_wstring(num_wchars = nil)
      if num_wchars.nil?
        # Find the length of the string
        length = 0
        last_char = nil
        while last_char != "\000\000" do
          length += 1
          last_char = self.get_bytes(0,length * 2)[-2..-1]
        end

        num_wchars = length
      end

      Chef::ReservedNames::Win32::Unicode.wide_to_utf8(self.get_bytes(0, num_wchars*2))
    end
  end
end

class String
  def to_wstring
    Chef::ReservedNames::Win32::Unicode.utf8_to_wide(self)
  end
end

# https://bugs.ruby-lang.org/issues/11439
if RUBY_VERSION =~ /^2\.1/
  module Win32
    class Registry
      def write(name, type, data)
        case type
        when REG_SZ, REG_EXPAND_SZ
          data = data.to_s.encode(WCHAR) + WCHAR_NUL
        when REG_MULTI_SZ
          data = data.to_a.map {|s| s.encode(WCHAR)}.join(WCHAR_NUL) << WCHAR_NUL << WCHAR_NUL
        when REG_BINARY
          data = data.to_s
        when REG_DWORD
          data = API.packdw(data.to_i)
        when REG_DWORD_BIG_ENDIAN
          data = [data.to_i].pack('N')
        when REG_QWORD
          data = API.packqw(data.to_i)
        else
          raise TypeError, "Unsupported type #{type}"
        end
        API.SetValue(@hkey, name, type, data, data.bytesize)
      end
    end
  end
end