Six

# File lib/six.rb, line 32
def initialize(packs={})
  raise InitializeArgumentError.new unless packs.kind_of?(Hash)

  @rules_packs = {}
  @current_rule_pack = nil

  packs.each { |key, pack| add_pack!(key, pack) }
end

# File lib/six.rb, line 91
def <<(pack)
  add_pack!(pack.object_id.to_s, pack)
end

# File lib/six.rb, line 73
def add_pack(name, pack)
  rules_packs[name.to_sym] = pack if valid_rules_object?(pack)
end

# File lib/six.rb, line 78
def add_pack!(name, pack)
  add_pack(name, pack) || raise_incorrect_pack_object
end

# File lib/six.rb, line 162
def allowed?(object, actions, subject)
  # if multiple actions passed
  # check all actions to be allowed
  if actions.respond_to?(:each) 
    actions.all? { |action| action_included?(object, action, subject) }
  else
    # single action check
    action_included?(object, actions, subject)
  end
end

# File lib/six.rb, line 141
def pack_exist?(name)
  rules_packs.has_key?(name.to_sym)
end

# File lib/six.rb, line 104
def remove_pack(name)
  if pack_exist?(name)
    @current_rule_pack = nil if rules_packs[name.to_sym] == @current_rule_pack
    rules_packs.delete(name.to_sym)
  end
end

# File lib/six.rb, line 112
def remove_pack!(name)
  remove_pack(name) || raise_no_such_pack
end

# File lib/six.rb, line 175
def reset_use
  @current_rule_pack = nil
end

# File lib/six.rb, line 50
def use_pack(name)
  if pack_exist?(name)
    @current_rule_pack = name.to_sym
    self
  end
end

# File lib/six.rb, line 58
def use_pack!(name)
  use_pack(name) ? self : raise_no_such_pack
end

# File lib/six.rb, line 125
def valid_rules_object?(object)
  object.respond_to?(:allowed) &&
    object.send(:allowed, nil, nil).kind_of?(Array)
rescue 
  false
end

# File lib/six.rb, line 181
def action_included?(object, action, subject)
  if current_rule_pack
    rules_packs[current_rule_pack].allowed(object, subject).include?(action)
  else 
    rules_packs.values.map { |rp| rp.allowed(object, subject) }.flatten.include?(action)
  end
end

# File lib/six.rb, line 193
def raise_incorrect_pack_object
  raise Six::InvalidPackPassed.new
end

# File lib/six.rb, line 189
def raise_no_such_pack
  raise Six::NoPackError.new
end