module Gtn::Hooks

# File _plugins/gtn/hooks.rb, line 13
def self.by_tool(site)
  Jekyll.logger.debug "[GTN/Hooks/by_tool] Started"
  init_count = site.pages.size
  start_time = Time.now

  tools = Gtn::TopicFilter.list_materials_by_tool(site)
  tools.reject!{|tool, _| tool.include?('{{')}

  tools.each do |tool, tutorials|
    # tool: e.g. `saskia-hiltemann/krona_text/krona-text`

    ordered_tool_ids = tutorials['tool_id']
      .map{|x| 
        if x[0] == x[1]
          # TODO: collect versions of builtins.
          [x[0], '0.0.0'] # Fake version for local only tools
        else
          x
        end
      }
      .reject{|x| x[0] == x[1]}
      .map{|x| [x[0], x[1], Gem::Version.new(fix_version(x[1]))]}
      .sort_by{|x| x[2]}

    # Redirect from the older, shorter IDs that have more potential for conflicts.
    if tool.include?('/')
      previous_id = tool.split('/')[0] + '/' + tool.split('/')[2]
    else
      previous_id = tool # No change
    end

    page2 = Jekyll::PageWithoutAFile.new(site, '', 'by-tool/', "#{tool.gsub('%20', ' ')}.html")
    page2.content = nil
    page2.data['layout'] = 'by_tool'
    page2.data['short_tool'] = tool
    page2.data['observed_tool_ids'] = ordered_tool_ids.map{|x| x[0..1]}.reverse
    page2.data['tutorial_list'] = tutorials['tutorials']
    page2.data['latest_tool_id'] = ordered_tool_ids.map{|x| x[0]}.last
    # page2.data['redirect_from'] = ["/by-tool/#{previous_id.gsub('%20', ' ')}"]
    site.pages << page2

    # TODO: For whatever reason the redirect_from does NOT work, even this
    # early in the hooks, so we're just going to write the file and call it
    # a day. Someone should fix this someday. My apologies for leaving it like this.
    if previous_id != tool
      page2 = Jekyll::PageWithoutAFile.new(site, '', 'by-tool/', "#{previous_id}.html")
      page2.content = nil
      page2.data['layout'] = 'by_tool'
      page2.data['short_tool'] = tool
      page2.data['observed_tool_ids'] = ordered_tool_ids.map{|x| x[0..1]}.reverse
      page2.data['tutorial_list'] = tutorials['tutorials']
      page2.data['latest_tool_id'] = ordered_tool_ids.map{|x| x[0]}.last
      site.pages << page2
    end

  end
  Jekyll.logger.info "[GTN/Hooks/by_tool] #{site.pages.size - init_count} pages added in #{Time.now - start_time}s"
end