module AttrPouch

# File lib/attr_pouch.rb, line 11
def self.config
  @@config ||= Config.new
end

# File lib/attr_pouch.rb, line 6
def self.configure
  @@config ||= Config.new
  yield @@config
end

# File lib/attr_pouch.rb, line 15
def self.included(base)
  base.extend(ClassMethods)
  # we can't just independently define this in ClassMethods since
  # `dataset_module` is only defined on Sequel::Model subclasses
  base.dataset_module do
    define_method(:where_pouch) do |pouch_field, expr_hash|
      ds = self
      pouch = model.pouch(pouch_field)
      if pouch.nil?
        raise ArgumentError,
              "No pouch defined for #{pouch_field}"
      end
      if pouch.json?
        raise UnsupportedError, "Dataset queries not supported for columns of type json"
      end

      expr_hash.each do |key, value|
        key = key.to_s
        field = pouch.field_definition(key)
        if field.nil?
          raise ArgumentError,
                "No field #{key} defined for pouch #{pouch_field}"
        end

        if value.respond_to?(:each)
          value.each_with_index do |v,i|
            condition = pouch.store.contains(pouch.wrap(key => field.encode(v)))
            ds = i == 0 ? ds.where(condition) : ds.or(condition)
          end
        elsif value.nil?
          ds = ds.where(pouch.store.has_key?(key) => false)
              .or(pouch.store.contains(pouch.wrap(key => field.encode(value))))
        else
          ds = ds.where(pouch.store
                        .contains(pouch.wrap(key => field.encode(value))))
        end
      end
      ds
    end
  end
end