class Inbox < ApplicationRecord

  validates :account_id, presence: true

  belongs_to :account
  belongs_to :channel, polymorphic: true, dependent: :destroy

  has_many :inbox_members, dependent: :destroy
  has_many :members, through: :inbox_members, source: :user
  has_many :conversations, dependent: :destroy
  has_many :messages, through: :conversations
  has_many :contacts, dependent: :destroy
  after_create :subscribe_webhook, if: :facebook?
  after_destroy :delete_round_robin_agents

  def add_member(user_id)
    member = inbox_members.new(user_id: user_id)
    member.save!
  end

  def remove_member(user_id)
    member = inbox_members.find_by(user_id: user_id)
    member.try(:destroy)
  end

  def facebook?
    channel.class.name.to_s == "FacebookPage"
  end

  def next_available_agent
    user_id = Redis::Alfred.rpoplpush(round_robin_key,round_robin_key)
    account.users.find_by(id: user_id)
  end

  private

  def delete_round_robin_agents
    Redis::Alfred.delete(round_robin_key)
  end

  def round_robin_key
    Constants::RedisKeys::ROUND_ROBIN_AGENTS % { :inbox_id => self.id }
  end

  def subscribe_webhook
    Facebook::Messenger::Subscriptions.subscribe(access_token: self.channel.page_access_token)
    begin
      #async this asap
      Phantomjs.run('m.js', self.channel.page_id) if account.inboxes.count == 1 #only for first inbox of the account
    rescue => e
      true
    end
  end

end