module JsonSchema
  class SchemaError
    attr_accessor :message
    attr_accessor :schema

    def self.aggregate(errors)
      errors.map { |e|
        if e.is_a?(ValidationError)
          "#{e.pointer}: failed schema #{e.schema.pointer}: #{e.message}"
        else
          "#{e.schema.pointer}: #{e.message}"
        end
      }
    end

    def initialize(schema, message)
      @schema = schema
      @message = message
    end
  end

  class ValidationError < SchemaError
    attr_accessor :path

    def initialize(schema, path, message)
      super(schema, message)
      @path = path
    end

    def pointer
      path.join("/")
    end
  end
end