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# frozen_string_literal: true
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module RuboCop
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  module Cop
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    module Lint
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      class DeprecatedGemVersion < Base
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        include RangeHelp
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        extend AutoCorrector
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        MSG = 'Use `Rex::Version` instead of `Gem::Version`.'
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        # @!method gem_version_const(node)
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        def_node_matcher :gem_version_const, <<~PATTERN
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          (const
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           $(const {nil? cbase} :Gem) {:Version})
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        PATTERN
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        # @!method gem_version_const_cbase(node)
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        def_node_matcher :gem_version_const_cbase, <<~PATTERN
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          (const
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           $(const {cbase} :Gem) {:Version})
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        PATTERN
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        def on_const(node)
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          return unless gem_version_const(node)
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          add_offense(node, message: MSG) do |corrector|
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            autocorrect(corrector, node)
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          end
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        end
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        private
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        def autocorrect(corrector, node)
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          if gem_version_const_cbase(node)
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            corrector.replace(gem_version_const_cbase(node), '::Rex')
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          else
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            corrector.replace(gem_version_const(node), 'Rex')
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          end
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        end
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      end
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    end
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  end
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end
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