class Need < ActiveRecord::Base
  include Workflow

  scope :shared, -> {
    where(state: ["verified", "negociating", "negociated", "failed"])
  }

  scope :top, -> { joins('left join wishes on wishes.need_id = needs.id')
    .select('needs.*, count(wishes.id) as wishes_count')
    .group("needs.id")
    .order("wishes_count DESC") }

  workflow_column :state
  max_paginates_per 10
  acts_as_paranoid

  has_many :wishes
  has_many :customers, -> { uniq }, through: :wishes

  validates :title, :presence => true, length: {within: 4..128}
  validates :description, presence: true, length: {maximum: 65535}
  belongs_to :author, class_name: 'Customer'


  # Need's workflow lifecycle
  workflow do
    state :created do
      event :validate, :transitions_to => :verified
      event :refuse, :transitions_to => :refused
    end
    state :refused
    state :verified do
      event :negociate, :transitions_to => :negociating
    end
    state :negociating do
      event :accept, :transitions_to => :negociated
      event :reject, :transitions_to => :failed
    end
    state :negociated
    state :failed
  end

  # Human state conversion
  def human_state
    case state
    when 'created'
      "En attente de validation"
    when 'verified'
      "Validé"
    when 'refused'
      "Refusé"
    when 'negociating'
      "En cours de negociation"
    when 'negociated'
      "Négociation effecutée"
    when 'failed'
      "Négociation échouée"
    else
      "Inconnu"
    end
  end

end