# Copyright (c) 2013-2016 SUSE LLC
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 3 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.   See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, contact SUSE LLC.
#
# To contact SUSE about this file by physical or electronic mail,
# you may find current contact information at www.suse.com

class ChangedConfigFilesRenderer < Renderer
  def content(description)
    return unless description["changed_config_files"]

    diffs_dir = description.scope_file_store("analyze/changed_config_files_diffs").path

    if !diffs_dir && @options[:show_diffs]
      raise Machinery::Errors::SystemDescriptionError.new(
        "Diffs can not be shown because they were not generated yet.\n" \
        "You can generate them with `#{Hint.program_name} analyze" \
        " --operation=changed-config-files-diffs #{description.name}`."
      )
    end

    list do
      file_status = description["changed_config_files"].extracted
      files = description["changed_config_files"]

      if files.elements.empty?
        puts "There are no changed configuration files."
      elsif !file_status.nil?
        puts "Files extracted: #{file_status ? "yes" : "no"}"
      end

      if files
        files.each do |p|
          item_content = "#{p.name} (#{p.package_name}-#{p.package_version}, " \
            "#{p.changes.join(", ")})"
          if @options[:show_diffs] && p.changes.include?("md5")
            item item_content do
              render_diff_file(diffs_dir, p.name)
            end
          else
            item item_content
          end
        end
      end
    end
  end

  def display_name
    "Changed Configuration Files"
  end

  def compare_content_changed(changed_elements)
    list do
      changed_elements.each do |one, two|
        changes = []
        relevant_attributes = (one.attributes.keys & two.attributes.keys)

        relevant_attributes.each do |attribute|
          if one[attribute] != two[attribute]
            changes << "#{attribute}: #{one[attribute]} <> #{two[attribute]}"
          end
        end

        item "#{one.name} (#{changes.join(", ")})"
      end
    end
  end

  private

  def render_diff_file(diffs_dir, name)
    path = File.join(diffs_dir, name + ".diff")

    if File.exist?(path)
      puts "Diff:\n#{File.read(path).chomp}"
    else
      Machinery::Ui.warn "Diff for #{name} was not found on disk."
    end
  end
end