checkpoint: added functionality to delete statuses

internal/board/board.go

@@ -160,11 +160,11 @@ type UpdateStatusArgs struct {
 	StatusArgs
 }
 
-// UpdateStatus modifies an existing status in the db.
+// UpdateStatus modifies an existing status in the database.
 func (b *Board) UpdateStatus(args UpdateStatusArgs) error {
 	status, err := b.Status(args.StatusID)
 	if err != nil {
-		return fmt.Errorf("unable to retrieve the status from the db. %w", err)
+		return fmt.Errorf("unable to retrieve the status from the database. %w", err)
 	}
 
 	if len(args.Name) > 0 {
@@ -182,10 +182,25 @@ func (b *Board) UpdateStatus(args UpdateStatusArgs) error {
 	return nil
 }
 
-// TODO: Finish implementation.
+// DeleteStatus deletes a status from the database.
-// func (b *Board) DeleteStatus() error {
+// A status can only be deleted if it does not contain any cards.
-// 	return nil
+// TODO: Create two test cases for this function.
-// }
+func (b *Board) DeleteStatus(statusID int) error {
+	status, err := b.Status(statusID)
+	if err != nil {
+		return fmt.Errorf("unable to retrieve the status from the database; %w", err)
+	}
+
+	if len(status.CardIds) > 0 {
+		return StatusNotEmptyError{ID: statusID}
+	}
+
+	if err := db.Delete(b.db, db.StatusBucket, statusID); err != nil {
+		return fmt.Errorf("unable to delete the status from the database; %w", err)
+	}
+
+	return nil
+}
 
 type MoveToStatusArgs struct {
 	CardID          int
@@ -346,18 +361,18 @@ type DeleteCardArgs struct {
 // DeleteCard deletes a card from the database.
 func (b *Board) DeleteCard(args DeleteCardArgs) error {
 	if err := db.Delete(b.db, db.CardBucket, args.CardID); err != nil {
-		return fmt.Errorf("unable to delete the card from the database, %w", err)
+		return fmt.Errorf("unable to delete the card from the database; %w", err)
 	}
 
 	status, err := b.Status(args.StatusID)
 	if err != nil {
-		return fmt.Errorf("unable to read Status '%d' from the database, %w", args.StatusID, err)
+		return fmt.Errorf("unable to read Status '%d' from the database; %w", args.StatusID, err)
 	}
 
 	status.RemoveCardID(args.CardID)
 
 	if _, err := db.Write(b.db, db.StatusBucket, &status); err != nil {
-		return fmt.Errorf("unable to update the status in the database, %w", err)
+		return fmt.Errorf("unable to update the status in the database; %w", err)
 	}
 
 	return nil

internal/board/status.go

@@ -19,6 +19,14 @@ func (e StatusNotExistError) Error() string {
 	return fmt.Sprintf("status ID '%d' does not exist in the database", e.ID)
 }
 
+type StatusNotEmptyError struct {
+	ID int
+}
+
+func (e StatusNotEmptyError) Error() string {
+	return fmt.Sprintf("status ID '%d' must contain no cards before deletion", e.ID)
+}
+
 // Status represents the status of the Kanban board.
 type Status struct {
 	ID       int

internal/board/status_lifecycle_test.go

@@ -53,7 +53,8 @@ func TestStatusLifecycle(t *testing.T) {
 	t.Run("Test Status Update (In Progress)", testUpdateStatus(kanban, 2, 2, "In Progress"))
 	t.Run("Test Status Update (Backlog)", testUpdateStatus(kanban, 1, 1, "Backlog"))
 
-	// (TODO: Rearranging statuses still needs to be implemented) Rearrange the board so the order is To Do, On Hold, In Progress, Done
+	// (TODO: Rearranging statuses still needs to be implemented)
+	// Rearrange the board so the order is: Backlog, Next, In Progress, On Hold, Done
 
 	t.Logf("Let us now try moving a card from one status to another...")
 	t.Run("Test Move Card To Status", testMoveCardToStatus(kanban))
@@ -202,3 +203,9 @@ func testMoveCardToStatus(kanban board.Board) func(t *testing.T) {
 		}
 	}
 }
+
+func testDeleteStatus(kanban board.Board) func(t *testing.T) {
+	return func(t *testing.T) {
+
+	}
+}