module WCC::Media::ActiveRecordShim
  def self.included(base)
    base.public_send :include, InstanceMethods
    base.extend ClassMethods
  end

  module InstanceMethods
    def attributes
      raw
    end
  end

  module ClassMethods
    def active_record_shim(&block)
      builder = ShimBuilder.new
      builder.instance_eval(&block)
      builder.apply(self)
      self
    end

    def find(id)
      WCC::Media::Client.default.public_send(endpoint).find(id)
    end

    def find_all(**filters)
      WCC::Media::Client.default.public_send(endpoint).list(filters)
    end

    def find_by(**filters)
      raise ArgumentError, "You must provide at least one filter" if filters.empty?

      find_all(filters).first
    end

    def model_name
      name
    end

    def table_name
      endpoint
    end

    def unscoped
      yield
    end

    def find_in_batches(options, &block)
      options = options ? options.dup : {}
      batch_size = options.delete(:batch_size) || 1000
      filter = {
        limit: batch_size,
        offset: options.delete(:start) || 0
      }

      find_all(filter).each_slice(batch_size, &block)
    end
  end

  class ShimBuilder
    def apply(klass)
      filters = (@filters || []).freeze
      endpoint = @endpoint || klass.name.split('::').last.downcase
      name = @name || klass.name.split('::').last.downcase
      klass.instance_eval do
        define_singleton_method('filters') { filters }
        define_singleton_method('endpoint') { endpoint }
        define_singleton_method('name') { name }
      end
    end

    [:filters, :endpoint, :name].each do |att|
      class_eval("def #{att}(value); @#{att} = value; end", __FILE__, __LINE__)
    end
  end
end