1 files changed, 87 insertions, 0 deletions
diff --git a/bug/timeline.go b/bug/timeline.go
new file mode 100644
index 00000000..d734e18b
--- /dev/null
+++ b/bug/timeline.go
@@ -0,0 +1,87 @@
+package bug
+
+import (
+	"github.com/MichaelMure/git-bug/util/git"
+)
+
+type TimelineItem interface {
+	// Hash return the hash of the item
+	Hash() (git.Hash, error)
+}
+
+type CommentHistoryStep struct {
+	Message  string
+	UnixTime Timestamp
+}
+
+// CreateTimelineItem replace a Create operation in the Timeline and hold its edition history
+type CreateTimelineItem struct {
+	CommentTimelineItem
+}
+
+func NewCreateTimelineItem(hash git.Hash, comment Comment) *CreateTimelineItem {
+	return &CreateTimelineItem{
+		CommentTimelineItem: CommentTimelineItem{
+			hash:      hash,
+			Author:    comment.Author,
+			Message:   comment.Message,
+			Files:     comment.Files,
+			CreatedAt: comment.UnixTime,
+			LastEdit:  comment.UnixTime,
+			History: []CommentHistoryStep{
+				{
+					Message:  comment.Message,
+					UnixTime: comment.UnixTime,
+				},
+			},
+		},
+	}
+}
+
+// CommentTimelineItem replace a Comment in the Timeline and hold its edition history
+type CommentTimelineItem struct {
+	hash      git.Hash
+	Author    Person
+	Message   string
+	Files     []git.Hash
+	CreatedAt Timestamp
+	LastEdit  Timestamp
+	History   []CommentHistoryStep
+}
+
+func NewCommentTimelineItem(hash git.Hash, comment Comment) *CommentTimelineItem {
+	return &CommentTimelineItem{
+		hash:      hash,
+		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) Hash() (git.Hash, error) {
+	return c.hash, nil
+}
+
+// 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{
+		Message:  comment.Message,
+		UnixTime: comment.UnixTime,
+	})
+}
+
+// Edited say if the comment was edited
+func (c *CommentTimelineItem) Edited() bool {
+	return len(c.History) > 1
+}