# Copyright (c) 2016-2019 Yegor Bugayenko
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the 'Software'), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

#
# Storage that upgrades itself on load.
#
class UpgradedStorage
  def initialize(origin, version)
    @origin = origin
    @version = version
  end

  def load
    xml = @origin.load
    if xml.xpath('/*/@version')[0] != @version
      [
        'remove-broken-issues',
        'add-namespace'
      ].each do |xsl|
        xml = Nokogiri::XSLT(
          File.read("assets/upgrades/#{xsl}.xsl")
        ).transform(xml)
      end
      save(xml)
    end
    xml
  end

  def save(xml)
    @origin.save(xml)
  end
end
