class Setting < ActiveRecord::Base
  
  class SettingNotFound < StandardError
  end
  
  belongs_to :settable, :polymorphic => true

  include Localized  
  validates_presence_of :key, :kind
  validates :key, :uniqueness => {:scope => [:settable_id, :settable_type, :locale]}

  field :key
  index :key
  
  field :kind
  field :group
    
  field :integer_value, :integer
  field :float_value, :float
  field :text_value, :text
  field :string_value, :string
  field :datetime_value, :datetime
  field :date_value, :date
  has_attached :file_value
  
  
  def self.kinds
          [ :string,
            :integer,
            :float,
            :boolean,
            :text,
            :datetime,
            :date,
            :file
           ]
  end

  def value
    setting_kind = self.kind

    # this will break paperclip 'missing.png' feature, but at least
    # provides a way to check if an attachment is missing
    if setting_kind == "file"
      return nil if !file_value?
    end
    self.send("#{setting_kind}_value")
  end

  # examples
  #
  # Setting.get("contacts/registrant", :default => "[ none ]")
  # Setting.get( :registrant, :group => :contacts ) 
  # Setting.get( "address", :of => @user )
  
  def self.get(key, opts = {})
      key = key.to_s
      gk  = key.split("/")

      group = nil
      if gk.size == 1
        group = opts.delete(:group)
        key = gk.first
      else
        group, key = gk
      end
      
      default = opts.delete(:default)
      settable = opts.delete(:of)
      settable_id = settable.try(:id)
      
      query = opts.dup
      query.merge!({:key => key})
      query.merge!({:group => group}) if group
      query.merge!({:settable_id => settable_id})
            
      self.where(query).first.try(:value) || default
  end
  
  # using Setting.get is simpler, expecially if you don't want 'autocreate' feature
  def self.global(key, opts = {})
    key = key.to_s
    autocreate  = opts.delete(:autocreate)
    kind        = opts.delete(:kind) || :string
    default     = opts.delete(:default)
    group       = (opts.delete(:group) || "global").to_s
    options     = opts.delete(:options)
    locale      = opts.delete(:locale).try(:to_s) 
    
    query = where(:key => key, :group => group, :settable_id => nil)
    
    if locale
      query = query.where(:locale => locale)
    end
        
    setting = query.first ||  (  autocreate && create(
                                    :key => key, 
                                    :locale => locale, 
                                    :kind => kind, 
                                    :"#{kind}_value" => default, 
                                    :group => group, 
                                    :options => options
                                  ) 
                              )
    
    raise SettingNotFound.new("Setting `#{[group, key].join('/')}` not found for locale `#{locale || 'any'}`") if !setting
    setting.value || default
    
  end

  def self.update_global(key, value)
    s = self.find_by_key_and_settable_id(key.to_s, nil)

    if s
      s.update_attributes(:value => value)
    end
  end
  
  field :options, :text
  serialize :options, Hash
  
  # after_initialize do |record|
  #   record.options ||= {}
  # end
    
end