module Rtml::ReverseEngineering::Simulator::VariableLookup
  # Checks a value to see if it references a TML variable; if so, it resolves that variable into its value;
  # otherwise, the original value is returned.
  def resolve(value, all_variables, known_variable_types)
    if value =~ /^tmlvar:(.*)$/
      lookup_variable_value($~[1], all_variables, known_variable_types)
    else
      value
    end
  end

  # Finds the variable in the all_variables hash whose name matches the specified name (string or symbol), and then
  # returns its value. If that value is an instance of +Rtml::ReverseEngineering::Simulator::VariableValue+, calls
  # the #value method on that object instead.
  #
  # If the variable is not found, then a default value will be returned depending on its type.
  def lookup_variable_value(name, all_variables, known_variable_types)
    all_variables.each do |var_name, varval|
      if var_name.to_s == name
        return(varval.kind_of?(Rtml::ReverseEngineering::Simulator::VariableValue) ? varval.value : varval)
      end
    end
    default_value_for_type(known_variable_types[name])
  end

  def default_value_for_type(type)
    case type
      when :integer then 1
      else "generic"
    end
  end
end