# frozen_string_literal: true

module Nanoc::Helpers
    module AlgoliaRank
        ###
        # Add a URL pattern and weight to CUSTOM_PAGERANKS to modify Algolia search results.
        #
        # Weights greater than DEFAULT_PAGERANK will boost a page in search results,
        # and weights below DEFAULT_PAGERANK will lower its ranking.
        #
        # The weight value appears in the "docsearch:pageRank" metatag
        # on each page that contains the URL pattern.
        #
        # For example, the "/runner/development/reviewing-gitlab-runner.html" page
        # will match "/runner/development" in CUSTOM_PAGERANKS and receive a weight of "20".
        # 
        # @see https://docsearch.algolia.com/docs/record-extractor/#boost-search-results-with-pagerank
        ## 
        DEFAULT_PAGERANK = 100
        CUSTOM_PAGERANKS = {
            "/ee/api"               => 50,
            "/ee/development"       => 20,
            "/omnibus/development"  => 20,
            "/runner/development"   => 20,
            "/charts/development"   => 20,
        }

        def algolia_rank(item)
            if result = CUSTOM_PAGERANKS.keys.find {|k| item.identifier.to_s.include? k}
                return CUSTOM_PAGERANKS[result]
            else
                return DEFAULT_PAGERANK
            end
        end

        ###
        # Calculate the navigation level of a given page.
        # We use this on Algolia to increase relevance of higher-level pages.
        ###
        def algolia_level(item)
            path = item.identifier.to_s
            level = path.scan("/").count
            if path.include? "index.md"
                level -= 1
            end
            return level
        end

    end
end