1 files changed, 80 insertions, 0 deletions
diff --git a/entities/bug/timeline.go b/entities/bug/timeline.go
new file mode 100644
index 00000000..d7f042db
--- /dev/null
+++ b/entities/bug/timeline.go
@@ -0,0 +1,80 @@
+package bug
+
+import (
+	"strings"
+
+	"github.com/MichaelMure/git-bug/entities/identity"
+	"github.com/MichaelMure/git-bug/entity"
+	"github.com/MichaelMure/git-bug/repository"
+	"github.com/MichaelMure/git-bug/util/timestamp"
+)
+
+type TimelineItem interface {
+	// Id return the identifier of the item
+	Id() entity.Id
+}
+
+// CommentHistoryStep hold one version of a message in the history
+type CommentHistoryStep struct {
+	// The author of the edition, not necessarily the same as the author of the
+	// original comment
+	Author identity.Interface
+	// The new message
+	Message  string
+	UnixTime timestamp.Timestamp
+}
+
+// CommentTimelineItem is a TimelineItem that holds a Comment and its edition history
+type CommentTimelineItem struct {
+	// id should be the same as in Comment
+	id        entity.Id
+	Author    identity.Interface
+	Message   string
+	Files     []repository.Hash
+	CreatedAt timestamp.Timestamp
+	LastEdit  timestamp.Timestamp
+	History   []CommentHistoryStep
+}
+
+func NewCommentTimelineItem(comment Comment) CommentTimelineItem {
+	return CommentTimelineItem{
+		id:        comment.id,
+		Author:    comment.Author,
+		Message:   comment.Message,
+		Files:     comment.Files,
+		CreatedAt: comment.UnixTime,
+		LastEdit:  comment.UnixTime,
+		History: []CommentHistoryStep{
+			{
+				Message:  comment.Message,
+				UnixTime: comment.UnixTime,
+			},
+		},
+	}
+}
+
+func (c *CommentTimelineItem) Id() entity.Id {
+	return c.id
+}
+
+// Append will append a new comment in the history and update the other values
+func (c *CommentTimelineItem) Append(comment Comment) {
+	c.Message = comment.Message
+	c.Files = comment.Files
+	c.LastEdit = comment.UnixTime
+	c.History = append(c.History, CommentHistoryStep{
+		Author:   comment.Author,
+		Message:  comment.Message,
+		UnixTime: comment.UnixTime,
+	})
+}
+
+// Edited say if the comment was edited
+func (c *CommentTimelineItem) Edited() bool {
+	return len(c.History) > 1
+}
+
+// MessageIsEmpty return true is the message is empty or only made of spaces
+func (c *CommentTimelineItem) MessageIsEmpty() bool {
+	return len(strings.TrimSpace(c.Message)) == 0
+}