module Flydata
module PluginSupport
  class Context

    def self.mandatory_opts
      @mandatory_opts ||= []
    end

    def self.optional_opts
      @optional_opts ||= []
    end

    def self.register_mandatory_opts(*opts)
      @mandatory_opts ||= []
      opts.each {|opt|
        @mandatory_opts << opt.to_sym
        attr_accessor opt
      }
      nil
    end

    def self.register_optional_opts(*opts)
      @optional_opts ||= []
      opts.each {|opt|
        @optional_opts << opt.to_sym
        attr_accessor opt
      }
      nil
    end

    register_mandatory_opts :tables,
                            :tag,
                            :sync_fm,
                            :omit_events,
                            :table_revs,
                            :table_meta

    register_optional_opts  :cur_src_pos_file,
                            :table_src_pos_files,
                            :params

    def initialize(opts)
      missing_opts = self.class.mandatory_opts - opts.keys
      unless (missing_opts.empty?)
        raise "Mandatory option(s) are missing: #{missing_opts.join(', ')}"
      end

      opts.each do |k, v|
        self.instance_variable_set(:"@#{k}", v)
      end
    end

    def source_pos_class
      self.class::SOURCE_POS_CLASS
    end
  end
end
end