package engine

import "fmt"

// Annotate appends a timestamped annotation to the task and saves.
func (t *Task) Annotate(text string) error {
	annotation := Annotation{
		Timestamp: timeNow().Unix(),
		Text:      text,
	}
	t.Annotations = append(t.Annotations, annotation)
	return t.Save()
}

// Denotate removes the most recent annotation from the task and saves.
// Returns the removed annotation, or an error if there are none.
func (t *Task) Denotate() (*Annotation, error) {
	if len(t.Annotations) == 0 {
		return nil, fmt.Errorf("task has no annotations")
	}
	removed := t.Annotations[len(t.Annotations)-1]
	t.Annotations = t.Annotations[:len(t.Annotations)-1]
	if err := t.Save(); err != nil {
		return nil, err
	}
	return &removed, nil
}