class Topic < ActiveRecord::Base
  include TopicsHelper

  belongs_to :user

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

  has_many :mappings, as: :mappable, dependent: :destroy
  has_many :maps, :through => :mappings

  validates :permission, presence: true
  validates :permission, inclusion: { in: Perm::ISSIONS.map(&:to_s) }
    
  # 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

  scope :relatives1, ->(topic_id = nil) { 
    includes(:topics1)
    .where('synapses.node1_id = ?', topic_id)
    .references(:synapses)
  }

  scope :relatives2, ->(topic_id = nil) {
    includes(:topics2)
    .where('synapses.node2_id = ?', topic_id)
    .references(:synapses)
  }

  def user_name
    user.name
  end

  def user_image
    user.image.url
  end

  def map_count
    maps.count
  end

  def synapse_count
    synapses.count
  end

  def inmaps
    maps.map(&:name)
  end

  def inmapsLinks
    maps.map(&:id)
  end

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

  # TODO move to a decorator?
  def synapses_csv(output_format = 'array')
    output = []
    synapses.each do |synapse|
      if synapse.category == 'from-to'
        if synapse.node1_id == id
          output << synapse.node1_id.to_s + '->' + synapse.node2_id.to_s
        elsif synapse.node2_id == id
          output << synapse.node2_id.to_s + '<-' + synapse.node1_id.to_s
        else
          fail 'invalid synapse on topic in synapse_csv'
        end
      elsif synapse.category == 'both'
        if synapse.node1_id == id
          output << synapse.node1_id.to_s + '<->' + synapse.node2_id.to_s
        elsif synapse.node2_id == id
          output << synapse.node2_id.to_s + '<->' + synapse.node1_id.to_s
        else
          fail 'invalid synapse on topic in synapse_csv'
        end
      end
    end
    if output_format == 'array'
      return output
    elsif output_format == 'text'
      return output.join('; ')
    else
      fail 'invalid argument to synapses_csv'
    end
    output
  end

  def topic_autocomplete_method
    "Get: #{self.name}"
  end
  
  def mk_permission
    Perm.short(permission)
  end
end