# https://github.com/AustinBlues/RSS-Speed-Reader/blob/master/lib/rss_speed_reader.rb
# https://github.com/tenderlove/nokogiri/pull/524

module Daengine::TeamsiteMetadataParser

  @@translation = {
      'TeamSite/Metadata/web_title' => 'title',
      "TeamSite/Metadata/enterprise_last_updated_date"=> 'changed_at',
      "TeamSite/Metadata/enterprise_audience_id"=> 'audiences',
      "TeamSite/Metadata/enterprise_sami_desc"=> 'sami_code',
      "TeamSite/Metadata/enterprise_last_publication_date"=> 'published_at',
      "TeamSite/Metadata/enterprise_unpublish_date"=> 'unpublished_at',
      "TeamSite/Metadata/enterprise_expiration_date"=> 'expires_at',
      "TeamSite/Metadata/enterprise_guid" => 'guid',
      "TeamSite/Metadata/shortSynopsis" => 'summary',
      "TeamSite/Metadata/business_owner" => 'business_owner',
      "TeamSite/Metadata/enterprise_product_id" => 'product_ids',
      "TeamSite/Metadata/enterprise_content_organization_id" => 'content_organization_ids'
  }
  @@path_tuples = {
      "path" => 'path',
      "TeamSite/Metadata/enterprise_last_content_update_date" => 'doc_changed_at',
      "TeamSite/Metadata/enterprise_content_type_id" => 'content_type'
  }
  @@validations = {
      "TeamSite/Metadata/display_on_website" => lambda { |val| /Y|1|true/ =~ val },
      "TeamSite/Metadata/enterprise_expiration_date" => lambda {|val| !val.blank? },
      # "TeamSite/Metadata/enterprise_unpublish_date" => lambda {|val| val.blank? },
      #"path" => lambda {|val| !(/\/manifest\// =~ val) }
  }

  @@logger = nil

  def self.logger=(some_logger)
    @@logger = some_logger
    self
  end

  def self.log(args)
    @@logger.error(args) unless @@logger.blank?
  end

  def self.parse_tuple_file(file)
    time do
      asset = nil
      assets = {}
      docpath = {}
      valid = true
      while (line = file.gets)
        case line
          when /<\/?data-tuple>/
            if (asset.blank?)
              asset = DigitalAsset.new
            elsif (valid)
              assets[asset.guid] ||= asset.attributes # first tuple metadata wins
              assets[asset.guid]['documents_attributes'] ||= []
              assets[asset.guid]['documents_attributes'] << docpath
              # assets[asset.guid]['_id'] = asset.guid
              asset = nil; docpath = {}; valid = true;
            else
              asset = nil; docpath = {}; valid = true;
            end
          when /<tuple-field name="([^"]+)">([^<]+)<\/tuple-field>/
            if (valid)
              if @@validations[$1]
                valid = @@validations[$1].call($2)
              end
              if @@path_tuples[$1]
                docpath[@@path_tuples[$1]] = $2 # if this is one of our keys, 'send' to the method
              elsif (@@translation[$1])
                val = asset.send("#{@@translation[$1]}").respond_to?(:[]) ? $2.split(',') : $2
                asset.send("#{@@translation[$1]}=", val)
              end
            end
        end
      end
      # loop thru each doc in the collection, either replace or delete it
      error_files = []
      update_count = 0; delete_count = 0; added_count = 0;
      assets.keys.each do |key|
        da = nil
        begin
          if (!assets[key]['unpublished_at'].nil?)
            DigitalAsset.where(guid: key).try :delete_all
            delete_count += 1
          elsif (assets[key]['expires_at'].nil? || (assets[key]['expires_at'] < 1.minute.from_now))
            DigitalAsset.where(guid: key).try :delete_all
            delete_count += 1
          else
            asset_docs = remove_manifest_file(assets[key]['documents_attributes'])
            da = DigitalAsset.find_or_initialize_by(guid: key)
            if (!asset_docs.empty?)
              assets[key]['documents_attributes'] = asset_docs
              creating = da.new?
              da.documents = []
              da.update_attributes!(assets[key])
              if (creating)
                added_count += 1
              else
                update_count += 1
              end
            else
              DigitalAsset.where(guid: key).try :delete_all
              delete_count += 1
            end
          end
        rescue Exception => e
          #puts "--**Exception**--- #{e}"
          error_files << "#{da.try(:guid)}, #{da.try(:errors).try(:full_messages)}"
        end
      end
      log_txt = "TeamsiteMetadataParser: Failed to save/update following DigitalAssets in database:\n"
      error_files.each do |asset_file|
        log_txt = log_txt + "> #{asset_file}\n"
      end
      Daengine.log(log_txt, "warn") if !error_files.empty?
      DigitalAsset.purge! # if the purge criteria is met, purge anything not updated
      Daengine.log("TeamsiteMetadataParser: #{added_count} records added, #{update_count} updated, #{delete_count} removed", "info")
    end
  end


  def self.remove_manifest_file(asset_docs)
    docs = []
    asset_docs.each do |doc|
      docs << doc unless doc['path'].match('\/manifest\/')
    end
    docs
  end

  def self.time
    start = Time.now
    yield
    self.log "elapsed time was #{Time.now - start}"
  end

end