package zntg

// Action is a method without arguments or return values.
type Action func()

// Err converts the Action to an ActionErr.
func (a Action) Err() ActionErr {
	return func() error {
		a()
		return nil
	}
}

// ActionErr is a method that only returns an error.
type ActionErr func() error

// Actions is a slice of ActionErr's.
type Actions []ActionErr

// Add adds an Action and returns the new list of Actions.
func (a Actions) Add(fn Action) Actions {
	return a.AddErr(fn.Err())
}

// AddErr adds an ActionErr and return the new list of Actions.
func (a Actions) AddErr(fn ActionErr) Actions {
	return append(a, fn)
}

// Do executes all actions.
func (a Actions) Do() {
	for _, a := range a {
		a()
	}
}

// DoErr executes all actions but stops on the first action that returns an error.
func (a Actions) DoErr() error {
	for _, a := range a {
		if err := a(); err != nil {
			return err
		}
	}
	return nil
}