class CustomValue < ActiveRecord::Base
  belongs_to :custom_field
  belongs_to :customized, :polymorphic => true

  def after_initialize
    if new_record? && custom_field && (customized_type.blank? || (customized && customized.new_record?))
      self.value ||= custom_field.default_value
    end
  end
  
  # Returns true if the boolean custom value is true
  def true?
    self.value == '1'
  end
  
  def editable?
    custom_field.editable?
  end
  
  def visible?
    custom_field.visible?
  end
  
  def required?
    custom_field.is_required?
  end
  
  def to_s
    value.to_s
  end
  
protected
  def validate
    if value.blank?
      errors.add(:value, :blank) if custom_field.is_required? and value.blank?    
    else
      errors.add(:value, :invalid) unless custom_field.regexp.blank? or value =~ Regexp.new(custom_field.regexp)
      errors.add(:value, :too_short, :count => custom_field.min_length) if custom_field.min_length > 0 and value.length < custom_field.min_length
      errors.add(:value, :too_long, :count => custom_field.max_length) if custom_field.max_length > 0 and value.length > custom_field.max_length
    
      # Format specific validations
      case custom_field.field_format
      when 'int'
        errors.add(:value, :not_a_number) unless value =~ /^[+-]?\d+$/	
      when 'float'
        begin; Kernel.Float(value); rescue; errors.add(:value, :invalid) end
      when 'date'
        errors.add(:value, :not_a_date) unless value =~ /^\d{4}-\d{2}-\d{2}$/
      when 'list'
        errors.add(:value, :inclusion) unless custom_field.possible_values.include?(value)
      end
    end
  end
end