task.rb

class Task < ActiveRecord::Base

  attr_accessible :name, :taskable_id, :taskable_type, :question_id, :task_role_id, :task_order_id
  
  belongs_to :taskable, polymorphic: true

  belongs_to :task_role
  belongs_to :task_status
  belongs_to :task_order
  belongs_to :question
  has_many :task_assignments
  
  after_create :pub_create, :send_turkee_task, if: Rails.configuration.ka.tasks_launch_hits == true
  after_update :pub_update
  after_destroy :pub_destroy
  
  belongs_to :open_after_role, :class_name => "TaskRole"
  
  validates_presence_of :name#, :taskable_id, :taskable_type

  scope :open_tasks, includes(:task_assignments).where("task_assignments.id IS NULL") 
  scope :assigned_tasks, includes(:task_assignments).where("task_assignments.id IS NOT NULL")
  scope :assigned_to, lambda{|user| joins(:task_assignments).where("task_assignments.user_id = ?",user.id)}

  def question
    parent = self.taskable_type.capitalize.constantize.find(self.taskable_id)
    
    if self.taskable_type == 'question'
      question = parent
    else
      question = parent.question
    end

    question
  end

  def send_turkee_task#(num_assignments, reward, lifetime)

    hit_title = self.name+" (Chrome/Firefox/Safari)"
    hit_description = self.name#+"Given a problem, help us find websites that would be useful for solving it"
    host = Phase0::Application.config.hostaddress
    task = Turkee::TurkeeTask.create_hit(host, hit_title, hit_description, "", 1, 0.15, 2, 2, {},{:question_id => self.question.id},{:form_url => "#{host}"+parse_view_url})

  end

  def parse_view_url
    view_url = self.task_role.view_url

    if view_url.present?
      
      #
      # substitute #{:references}
      #

      view_url.sub! '#{:taskable_type}', self.taskable_type.downcase.pluralize
      view_url.sub! '#{:taskable_id}', self.taskable_id.to_s

    else 
      false
    end
  end

  def percent_options
    return {
      'None; start now'=>0,
      '10%'=>10,
      '20%'=>20,
      '30%'=>30,
      '40%'=>40,
      '50%'=>50,
      '60%'=>60,
      '70%'=>70,
      '80%'=>80,
      '90%'=>90,
      '100%'=>100
    }
  end

  def referent_excerpt(length=50)

  	@field = [
  		'name',
  		'title',
  		'text'
  	]

  	obj = self.taskable_type.capitalize.constantize.find(self.taskable_id)
  	@field.each do |f|
  		if obj[f].present?
  			excerpt = obj[f][0..length]

  			if excerpt.length > 49
  				excerpt = excerpt+'...'
  			end

			return excerpt

  		end
  	end
  end

  def prep_json
    tmp = self
    #tmp["count"] = self.task_assignments.count
    tmp.as_json(:except => :updated_at, :include => [:task_assignments])
  end 

  def pub_create
    PrivatePub.publish_to('/task/'+self.taskable_type+'/'+self.taskable_id.to_s+'/create', task: self.prep_json)
  end 

  def pub_update
    PrivatePub.publish_to('/task/'+self.taskable_type+'/'+self.taskable_id.to_s+'/update', task: self.prep_json, changes: self.changes)
  end 

  def pub_destroy
    PrivatePub.publish_to('/task/'+self.taskable_type+'/'+self.taskable_id.to_s+'/destroy', task: self.prep_json)
  end 

end