module Carte
  class Server < Sinatra::Base
    module Models
      class Card
        include Mongoid::Document
        include Mongoid::Timestamps
        include Mongoid::Attributes::Dynamic
        include Mongoid::Document::Taggable
        include Mongoid::Geospatial
      
        field :title, type: String
        field :new_title, type: String
        field :content, type: String
        field :random_point, type: Point, spatial: true

        index({title: 1}, {unique: true, name: "title_index"})
      
        validates :title,
          presence: true,
	  on: :create
        validates :title,
          uniqueness: true,
          length: {maximum: (ENV['CARTE_TITLE_MAX_LENGTH'] || 70).to_i}
        validates :content,
          presence: true,
          length: {maximum: (ENV['CARTE_DESCRIPTION_MAX_LENGTH'] || 560).to_i}
        validates :tags,
          length: {maximum: (ENV['CARTE_TAGS_MAX_SIZE'] || 3).to_i, message: 'are too many (maximum is 3 tags)'},
          array: {length: {maximum: (ENV['CARTE_TAG_MAX_LENGTH'] || 10).to_i}}
      
        has_many :histories
      
        def version
          self.histories.size + 1
        end
      
        before_validation(on: :update) do
          if self.new_title
            self.title = self.new_title
            self.new_title = nil
          end
        end

        before_create do
          self.random_point = [Random.rand, 0]
        end
      
        def self.random
          self.near(random_point: [Random.rand, 0])
        end

        def lefts(size, context=:created_at)
          result = Card.lt(context => self.send(context)).limit(size).to_a
          shortage = size - result.size
          if shortage > 0
            addition = self.class.lte(context => Card.max(context)).gt(context => self.send(context)).limit(shortage).to_a
            result = addition + result
          end
          result
        end

        def rights(size, context=:created_at)
          result = self.class.gt(context => self.send(context)).limit(size).to_a
          shortage = size - result.size
          if shortage > 0
            addition = self.class.gt(context => 0).lt(context => self.send(context)).limit(shortage).to_a
            result = result + addition
          end
          result
        end
      end
    end
  end
end