# encoding: utf-8
#
# Copyright (c) 2014 TechnoPark Corp.
# Copyright (c) 2014 Yegor Bugayenko
#
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# 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 NONINFINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# SOFTWARE.

module PDD
  module Rule
    # Rule for max duplicates.
    class MaxDuplicates
      # Ctor.
      # +xml+:: XML with puzzles
      def initialize(xml, max)
        @xml = xml
        @max = max.to_i
      end

      def errors
        @xml.xpath('//puzzle')
          .group_by { |p| p.xpath('body/text()').to_s }
          .map do |_, puzzles|
            next nil if puzzles.count <= @max
            "there are #{puzzles.count} duplicate(s) of the same puzzle: " +
            puzzles.map do |p|
              "#{p.xpath('file/text()')}:#{p.xpath('lines/text()')}"
            end.join(', ') +
            ", while maximum #{@max} duplicate is allowed"
          end.compact
      end
    end
  end
end