class Recipe < Ingredient
  include DefaultValues
  include TokenizedLike

  has_many :recipe_ingredients, -> { order :sort_order }, inverse_of: :recipe, dependent: :destroy
  belongs_to :user

  has_and_belongs_to_many :tags, autosave: true

  scope :undeleted, -> { where('deleted <> ? OR deleted IS NULL', true) }
  scope :not_log, -> { where('is_log <> ? OR is_log IS NULL', true) }
  scope :active, -> { undeleted.not_log }
  scope :is_ingredient, -> { where(is_ingredient: true) }

  accepts_nested_attributes_for :recipe_ingredients, allow_destroy: true

  default_values is_ingredient: false

  validates :name, presence: true
  validates :total_time, numericality: true, allow_blank: true
  validates :active_time, numericality: true, allow_blank: true
  validate :validate_is_ingredient

  attr_accessor :converted_scale, :converted_system, :converted_unit

  def cache_key
    [
      'recipes',
      self.id.to_s,
      converted_scale || '-',
      converted_system || '-',
      converted_unit || '-'
    ].join('/')
  end

  def validate_is_ingredient
    if self.is_ingredient
      if self.recipe_ingredients.any? { |ri| !ri.recipe_as_ingredient_id.nil? }
        errors[:base] << 'A recipe marked as an ingredient cannot contain recipe ingredients'
      end
    end
  end

  def scale(factor, auto_unit = false)
    self.converted_scale = factor
    recipe_ingredients.each do |ri|
      ri.scale(factor, auto_unit)
    end
    self
  end

  def convert_to_metric
    self.converted_system = 'metric'
    recipe_ingredients.each do |ri|
      ri.to_metric
    end
    self
  end

  def convert_to_standard
    self.converted_system = 'standard'
    recipe_ingredients.each do |ri|
      ri.to_standard
    end
    self
  end

  def convert_to_mass
    self.converted_unit = 'mass'
    recipe_ingredients.each do |ri|
      ri.to_mass
    end
    self
  end

  def convert_to_volume
    self.converted_unit = 'volume'
    recipe_ingredients.each do |ri|
      ri.to_volume
    end
    self
  end

  def yields=(val)
    @yields_list = nil
    super
  end

  def yields_list
    @yields_list ||= self.yields.to_s.split(',').concat(['1 each']).map { |y| y.strip }.select { |y| y.present? }.map do |y|
      begin
        vu = UnitConversion::parse(y)
        if vu.unit.nil?
          vu = UnitConversion::ValueUnit.for(vu.value, 'servings')
        end
        vu
      rescue UnitConversion::UnparseableUnitError
        nil
      end
    end.compact
  end

  def tag_names
    self.tags.map { |t| t.name }
  end

  def tag_names=(names)
    names = Array.wrap(names).map { |n| n.to_s }.select { |n| n.length > 0 }
    existing_tags = Tag.by_name(names)
    new_tags = names.select { |n| existing_tags.none? { |t| t.is?(n) } }
    self.tags = existing_tags
    new_tags.each do |n|
      self.tags << Tag.new(name: n)
    end
  end

  def nutrition_data(recalculate = false)
    if recalculate || @nutrition_data.nil?
      @nutrition_data = calculate_nutrition_data
    end
    @nutrition_data
  end

  def nutrition_errors
    nutrition_data.errors
  end

  def update_rating!
    logs = Log.for_recipe(self).for_user(self.user_id).where('rating IS NOT NULL')
    if logs.count > 0
      self.rating = logs.average(:rating)
      save(validate: false)
    else
      self.rating = nil
    end
    self.rating
  end

  # Creates a copy of this recipe suitable for associating to a log
  def log_copy(user)
    copy = Recipe.new
    copy.user = user
    copy.is_log = true
    copy.name = self.name
    copy.description = self.description
    copy.source = self.source
    copy.yields = self.yields
    copy.total_time = self.total_time
    copy.active_time = self.active_time
    copy.step_text = self.step_text

    self.recipe_ingredients.each do |ri|
      copy.recipe_ingredients << ri.log_copy
    end

    copy
  end

  def density
    mas = yields_list.detect { |y| y.mass? }
    vol = yields_list.detect { |y| y.volume? }
    if mas && vol
      "#{mas.value.value / vol.value.value} #{mas.unit.original_unit}/#{vol.unit.original_unit}"
    else
      nil
    end
  end

  def custom_units
    arbitrary = self.yields_list.select { |y| !y.mass? && !y.volume? }
    mass = self.yields_list.select { |y| y.mass? }
    volume = self.yields_list.select { |y| y.volume? }

    primary_unit = mass.first || volume.first

    if primary_unit
      cus = {}
      arbitrary.each do |y|
        ratio = 1
        if y.value.value != 1
          ratio = 1.0 / y.value.value
        end

        cus[y.unit.unit] = primary_unit.scale(ratio)
      end
      cus
    else
      {}
    end
  end

  def nutrition_unit
    UnitConversion.parse('1 each')
  end

  def self.for_criteria(criteria)
    query = self.active.order(criteria.sort_column => criteria.sort_direction)

    if criteria.name.present?
      query = query.matches_tokens(:name, criteria.name.split(' '))
    end

    if criteria.tags.present?
      tags = Tag.by_name(criteria.tags.split)
      query = query.where(id: tags.joins(:recipes).pluck('recipes.id'))
    end

    query.page(criteria.page).per(criteria.per)
  end

  def self.search_by_name(query)
    tokens = query.to_s.split(' ')

    if tokens.empty?
      self.none
    else
      self.matches_tokens(:name, tokens)
    end
  end

  private

  def calculate_nutrition_data
    NutritionData.new(recipe_ingredients)
  end
end