#
# Author:: Chirag Jog (<chirag@clogeny.com>)
# Copyright:: Copyright 2013-2016, Chef Software 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 "spec_helper"
if Chef::Platform.windows?
  require "chef/win32/version"
end

describe "Chef::ReservedNames::Win32::Version", :windows_only do
  before do

    wmi = WmiLite::Wmi.new
    host = wmi.first_of("Win32_OperatingSystem")

    # Use WMI to determine current OS version.
    # On Win2k8R2 and later, we can dynamically obtain marketing
    # names for comparison from WMI so the test should not
    # need to be modified when new Windows releases arise.
    # For Win2k8 we use static names in this test based on the
    # version number information from WMI. The names from WMI
    # contain extended characters such as registered trademark
    # on Win2k8 that we're not using in our library, so we have
    # to set the expectation statically.
    if is_windows_server_2008?(host)
      @current_os_version = "Windows Server 2008"
    else
      # The name from WMI is actually what we want in Win2k8R2+.
      # So this expectation sould continue to hold without modification
      # as new versions of Windows are released.
      @current_os_version = host["caption"]
    end

    @version = Chef::ReservedNames::Win32::Version.new
  end

  def for_each_windows_version
    @version.methods.each do |method_name|
      if Chef::ReservedNames::Win32::Version::WIN_VERSIONS.keys.find { |key| method_name.to_s == Chef::ReservedNames::Win32::Version.send(:method_name_from_marketing_name, key) }
        yield method_name
      end
    end
  end

  context "Win32 version object" do
    it "should have have one method for each marketing version" do
      versions = 0
      for_each_windows_version { versions += 1 }
      expect(versions).to be > 0
      expect(versions).to eq(Chef::ReservedNames::Win32::Version::WIN_VERSIONS.length)
    end

    it "should only contain version methods with legal method names" do
      method_name_pattern = /[a-z]+([a-z]|[0-9]|_)*\?{0,1}/

      for_each_windows_version do |method_name|
        method_match = method_name_pattern.match(method_name.to_s)
        expect(method_match).not_to be_nil
        expect(method_name.to_s).to eq(method_match[0])
      end
    end

    it "should have exactly one method that returns true" do
      true_versions = 0
      for_each_windows_version do |method_name|
        true_versions += 1 if @version.send(method_name)
      end
      expect(true_versions).to eq(1)
    end

    it "should successfully execute all version methods" do
      for_each_windows_version { |method_name| @version.send(method_name.to_sym) }
    end
  end

  context "Windows Operating System version" do
    it "should match the version from WMI" do
      expect(@current_os_version).to include(@version.marketing_name)
    end
  end

  def is_windows_server_2008?(wmi_host)
    is_win2k8 = false

    os_version = wmi_host["version"]

    # The operating system version is a string in the following form
    # that can be split into components based on the '.' delimiter:
    # MajorVersionNumber.MinorVersionNumber.BuildNumber
    os_version_components = os_version.split(".")

    if os_version_components.length < 2
      raise "WMI returned a Windows version from Win32_OperatingSystem.Version " +
        "with an unexpected format. The Windows version could not be determined."
    end

    # Windows 6.0 is Windows Server 2008, so test the major and
    # minor version components
    is_win2k8 = os_version_components[0] == "6" && os_version_components[1] == "0"
  end
end