YaleSTC/shifts

class ShiftPreference < ActiveRecord::Base
    belongs_to :user
    has_many :locations_shift_preferences
    has_many :locations, through: :locations_shift_preferences
    belongs_to :template

    validate :max_total_hours_greater_than_min
    validate :max_continuous_hours_greater_than_min
    validate :max_number_of_shifts_greater_than_min
    #validate :max_hours_per_day_greater_than_continuous
  #validate :feasibility_of_preferences

    protected

    def max_hours_per_day_greater_than_continuous
        errors.add(:base, "Maximum hours per day is greater than maximum continuous hours") if (self.max_hours_per_day > self.max_continuous_hours)
    end

  def max_total_hours_greater_than_min
      errors.add(:base, "Maximum total hours must be greater than minimum total hours") if (self.max_total_hours < self.min_total_hours)
  end
  
  def max_continuous_hours_greater_than_min
    errors.add(:base, "Maximum continuous hours must be greater than minimum continuous hours") if (self.max_continuous_hours < self.min_continuous_hours)
  end
  
  def max_number_of_shifts_greater_than_min
    errors.add(:base, "Maximum number of shifts must be greater than minimum number of shifts") if (self.max_number_of_shifts < self.min_number_of_shifts)
  end
  
  def feasibility_of_preferences
    errors.add("Signed up for enough hours (lower bound)") if ((self.max_continuous_hours*self.max_number_of_shifts < self.min_total_hours))
    errors.add("Signed up for enough hours (upper bound)") if ((self.min_continuous_hours*self.min_number_of_shifts > self.max_total_hours))
  end

end