# Created by this very Rails plugin in order to report stats more efficiently.
#
# See the rake task in this plugin for the details.
class MintCache < ActiveRecord::Base

  # Rebuilds cache table based on visits.
  #
  # Ignores pages with fewer than 10 visits.
  #
  # Can take a while to run. Try rebuild_efficient instead.
  def self.rebuild
    seen = {}
    Mint.popular_pages.each do |hit_summary|
      # Remove domain from front of resource
      generic_resource = hit_summary[:resource].gsub(%r%(https?://[^\/]+)%, '')
      next if seen[generic_resource]
      next if hit_summary[:resource_title].blank?
      if mc = MintCache.find_or_create_by_resource(generic_resource)
        # Titles are often "Page Name | Site Name", so remove the site name
        mc.resource_title = hit_summary[:resource_title].gsub(/\|.*$/, '')
        mc.visit_count = Mint.visits_to_resource(generic_resource)        
        mc.earliest_visit = Mint.earliest_visit_to_resource(generic_resource)
        (mc.visit_count < 10) ? mc.destroy : mc.save
        seen[generic_resource] = true
      end
    end
  end


  # Rebuild cache counts from the resources already listed in the mint_caches table.
  #
  # New resources must be entered into the table in another way, such as running MintCache.rebuild
  def self.rebuild_efficient
    seen = {}
    MintCache.find(:all).each do |mint_cache|
      # Remove domain from front of resource
      generic_resource = mint_cache.resource.gsub(%r%(https?://[^\/]+)%, '')
      next if seen[generic_resource]
      next if mint_cache.resource_title.blank?
      if mc = MintCache.find_or_create_by_resource(generic_resource)
        # Titles are often "Page Name | Site Name", so remove the site name
        mc.resource_title = mint_cache.resource_title.gsub(/\|.*$/, '')
        mc.visit_count = Mint.visits_to_resource(generic_resource)
        mc.earliest_visit = Mint.earliest_visit_to_resource(generic_resource)
        (mc.visit_count < 10) ? mc.destroy : mc.save
        seen[generic_resource] = true
      end
    end
  end


  # Returns an array of the 10 most popular pages in descending popularity, with the following fields:
  #
  #  resource
  #  resource_title
  #  visit_count
  #  earliest_visit
  #
  # Arguments will be sent to the standard ActiveRecord find method.
  def self.popular_pages(options={})
    defaults = {
          :limit => 10,
          :order => 'visit_count DESC' 
          }
    options = defaults.merge(options)
    find :all, options
  end

  # Returns stats for a single resource.
  #
  #  resource
  #  resource_title
  #  visit_count
  #  earliest_visit
  #
  # The resource url is stored without a domain in the mint_caches table
  #  /page/action/yada/yada
  def self.visits_to_resource(url)
    find_by_resource(url)
  rescue
    nil
  end
  
end