# frozen_string_literal: true

module RuboCop
  module Cop
    module Gemspec
      # Dependencies in the gemspec should be alphabetically sorted.
      #
      # @example
      #   # bad
      #   spec.add_dependency 'rubocop'
      #   spec.add_dependency 'rspec'
      #
      #   # good
      #   spec.add_dependency 'rspec'
      #   spec.add_dependency 'rubocop'
      #
      #   # good
      #   spec.add_dependency 'rubocop'
      #
      #   spec.add_dependency 'rspec'
      #
      #   # bad
      #   spec.add_development_dependency 'rubocop'
      #   spec.add_development_dependency 'rspec'
      #
      #   # good
      #   spec.add_development_dependency 'rspec'
      #   spec.add_development_dependency 'rubocop'
      #
      #   # good
      #   spec.add_development_dependency 'rubocop'
      #
      #   spec.add_development_dependency 'rspec'
      #
      #   # bad
      #   spec.add_runtime_dependency 'rubocop'
      #   spec.add_runtime_dependency 'rspec'
      #
      #   # good
      #   spec.add_runtime_dependency 'rspec'
      #   spec.add_runtime_dependency 'rubocop'
      #
      #   # good
      #   spec.add_runtime_dependency 'rubocop'
      #
      #   spec.add_runtime_dependency 'rspec'
      #
      # @example TreatCommentsAsGroupSeparators: true (default)
      #   # good
      #   # For code quality
      #   spec.add_dependency 'rubocop'
      #   # For tests
      #   spec.add_dependency 'rspec'
      #
      # @example TreatCommentsAsGroupSeparators: false
      #   # bad
      #   # For code quality
      #   spec.add_dependency 'rubocop'
      #   # For tests
      #   spec.add_dependency 'rspec'
      class OrderedDependencies < Base
        extend AutoCorrector
        include OrderedGemNode

        MSG = 'Dependencies should be sorted in an alphabetical order within ' \
              'their section of the gemspec. ' \
              'Dependency `%<previous>s` should appear before `%<current>s`.'

        def on_new_investigation
          return if processed_source.blank?

          dependency_declarations(processed_source.ast)
            .each_cons(2) do |previous, current|
            next unless consecutive_lines?(previous, current)
            next unless case_insensitive_out_of_order?(gem_name(current), gem_name(previous))
            next unless get_dependency_name(previous) == get_dependency_name(current)

            register_offense(previous, current)
          end
        end

        private

        def previous_declaration(node)
          declarations = dependency_declarations(processed_source.ast)
          node_index = declarations.find_index(node)
          declarations.to_a[node_index - 1]
        end

        def get_dependency_name(node)
          node.method_name
        end

        # @!method dependency_declarations(node)
        def_node_search :dependency_declarations, <<~PATTERN
          (send (lvar _) {:add_dependency :add_runtime_dependency :add_development_dependency} (str _) ...)
        PATTERN
      end
    end
  end
end
