inertia186/radiator

module Radiator
  class Operation
    include OperationIds
    include OperationTypes
    include Utils
    
    def initialize(options = {})
      chain = (options.delete(:chain) || 'hive').to_sym
      opt = options.dup
      @type = opt.delete(:type)
      
      opt.each do |k, v|
        instance_variable_set("@#{k}", type(chain, @type, k, v))
      end
      
      @use_condenser_namespace = if options.keys.include? :use_condenser_namespace
        options.delete(:use_condenser_namespace)
      else
        true
      end
      
      unless Operation::known_operation_names.include? @type
        raise OperationError, "Unsupported operation type: #{@type}"
      end
    end
    
    def to_bytes
      bytes = [id(@type.to_sym)].pack('C')
      
      Operation::param_names(@type.to_sym).each do |p|
        next unless defined? p
        
        v = instance_variable_get("@#{p}")
        bytes += v.to_bytes and next if v.respond_to? :to_bytes
        
        bytes += case v
        when Symbol then pakStr(v.to_s)
        when String then pakStr(v)
        when Integer then paks(v)
        when TrueClass then pakC(1)
        when FalseClass then pakC(0)
        when ::Array then pakArr(v)
        when ::Hash then pakHash(v)
        when NilClass then next
        else
          raise OperationError, "Unsupported type: #{v.class}"
        end
      end
      
      bytes
    end
    
    def payload
      params = {}
      
      Operation::param_names(@type.to_sym).each do |p|
        next unless defined? p
        
        v = instance_variable_get("@#{p}")
        next if v.nil?
        next if v.class == Radiator::Type::Future
        
        params[p] = case v
        when Radiator::Type::Beneficiaries then [[0, v.to_h]]
        when Hive::Type::Amount, Steem::Type::Amount
          if use_condenser_namespace?
            v.to_s
          else
            v.to_a
          end
        else; v
        end
      end
      
      [@type, params]
    end
  private
    def self.broadcast_operations_json_path
      @broadcast_operations_json_path ||= "#{File.dirname(__FILE__)}/broadcast_operations.json"
    end
    
    def self.broadcast_operations
      @broadcast_operations ||= JSON[File.read broadcast_operations_json_path]
    end

    def self.known_operation_names
      broadcast_operations.map { |op| op["operation"].to_sym }
    end
    
    def self.param_names(type)
      broadcast_operations.each do |op|
        if op['operation'].to_sym == type.to_sym
          return op['params'].map(&:to_sym)
        end
      end
    end
    
    def use_condenser_namespace?
      @use_condenser_namespace
    end    
  end
end