metamaps--metamaps/app/models/topic.rb

class Topic < ActiveRecord::Base
  include TopicsHelper

  belongs_to :user

  has_many :synapses1, :class_name => 'Synapse', :foreign_key => 'node1_id'
  has_many :synapses2, :class_name => 'Synapse', :foreign_key => 'node2_id'
  has_many :topics1, :through => :synapses2, :source => :topic1
  has_many :topics2, :through => :synapses1, :source => :topic2

  has_many :mappings
  has_many :maps, :through => :mappings
    
  # This method associates the attribute ":image" with a file attachment
  has_attached_file :image
    
  #, styles: {
  # thumb: '100x100>',
  # square: '200x200#',
  # medium: '300x300>'
  #}

  # Validate the attached image is image/jpg, image/png, etc
  validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/
  
  # This method associates the attribute ":image" with a file attachment
  has_attached_file :audio
  # Validate the attached audio is audio/wav, audio/mp3, etc
  validates_attachment_content_type :audio, :content_type => /\Aaudio\/.*\Z/   
    
  def synapses
     synapses1 + synapses2
  end
  
  def relatives
     topics1 + topics2
  end

  belongs_to :metacode

  def user_name
    self.user.name
  end

  def user_image
    self.user.image.url
  end

  def map_count
    self.maps.count
  end

  def synapse_count
    self.synapses.count
  end

  def inmaps
    self.maps.map(&:name)
  end

  def inmapsLinks
    self.maps.map(&:id)
  end

  def as_json(options={})
    super(:methods =>[:user_name, :user_image, :map_count, :synapse_count, :inmaps, :inmapsLinks])
  end

  def topic_autocomplete_method
    "Get: #{self.name}"
  end
  
  def mk_permission
    if self.permission == "commons"
      "co"
    elsif self.permission == "public"
      "pu"
    elsif self.permission == "private"
      "pr"
    end
  end

  # has no viewable synapses helper function
  def has_viewable_synapses(current)
  	result = false
  	self.synapses.each do |synapse|
  		if synapse.authorize_to_view(current)
  			result = true
  		end
  	end
  	return result
  end

  def synapses_csv(output_format = "array")
    output = []
    self.synapses.each do |synapse|
      if synapse.category == "from-to"
        if synapse.node1_id == self.id
          output << synapse.node1_id.to_s + "->" + synapse.node2_id.to_s
        elsif synapse.node2_id == self.id
          output << synapse.node2_id.to_s + "<-" + synapse.node1_id.to_s
        else
          abort("invalid synapse on topic in synapse_csv")
        end
      elsif synapse.category == "both"
        if synapse.node1_id == self.id
          output << synapse.node1_id.to_s + "<->" + synapse.node2_id.to_s
        elsif synapse.node2_id == self.id
          output << synapse.node2_id.to_s + "<->" + synapse.node1_id.to_s
        else
          abort("invalid synapse on topic in synapse_csv")
        end
      end
    end
    if output_format == "array"
      return output
    elsif output_format == "text"
      return output.join("; ")
    else
      abort("invalid argument to synapses_csv")
    end
    return output
  end
  
  ##### PERMISSIONS ######
  
  # returns false if user not allowed to 'show' Topic, Synapse, or Map
  def authorize_to_show(user)  
	if (self.permission == "private" && self.user != user)
		return false
	end
	return self
  end
  
  # returns false if user not allowed to 'edit' Topic, Synapse, or Map
  def authorize_to_edit(user)  
	if (self.permission == "private" && self.user != user)
		return false
	elsif (self.permission == "public" && self.user != user)
		return false
	end
	return self
  end

  def authorize_to_delete(user)  
    if (self.user != user)
      return false
    end
    return self
  end
  
  # returns Boolean if user allowed to view Topic, Synapse, or Map
  def authorize_to_view(user)  
	if (self.permission == "private" && self.user != user)
		return false
	end
	return true
  end
end