From e5c2af6d7240995820857d2feb2b9edb012dcfa8 Mon Sep 17 00:00:00 2001
From: Umputun <umputun@gmail.com>
Date: Mon, 25 Dec 2017 16:58:12 -0600
Subject: [PATCH] limited support for sort param

---
 app/rest/server.go |  4 ++--
 app/store/bolt.go  | 21 ++++++++++++++++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/app/rest/server.go b/app/rest/server.go
index 86b771df..b5844a10 100644
--- a/app/rest/server.go
+++ b/app/rest/server.go
@@ -159,12 +159,12 @@ func (s *Server) deleteCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	render.JSON(w, r, JSON{"id": id, "url": url})
 }
 
-// GET /find?url=post-url
+// GET /find?url=post-url&sort=-time
 func (s *Server) findCommentsCtrl(w http.ResponseWriter, r *http.Request) {
 	url := r.URL.Query().Get("url")
 	log.Printf("[DEBUG] get comments for %s", url)
 
-	comments, err := s.Store.Find(store.Request{Locator: store.Locator{URL: url}})
+	comments, err := s.Store.Find(store.Request{Locator: store.Locator{URL: url}, Sort: r.URL.Query().Get("sort")})
 	if err != nil {
 		log.Printf("[WARN] can't get comments for %s, %s", url, err)
 		httpError(w, r, http.StatusInternalServerError, err, "can't load comments comment")
diff --git a/app/store/bolt.go b/app/store/bolt.go
index 8dda970d..c1de2147 100644
--- a/app/store/bolt.go
+++ b/app/store/bolt.go
@@ -135,7 +135,26 @@ func (b *BoltDB) Find(request Request) ([]Comment, error) {
 		})
 	})
 
-	sort.Slice(res, func(i, j int) bool { return res[i].Timestamp.Before(res[j].Timestamp) })
+	// sort result according to request.Sort
+	sort.Slice(res, func(i, j int) bool {
+		switch request.Sort {
+		case "+time", "-time", "time":
+			if strings.HasPrefix(request.Sort, "-") {
+				return res[i].Timestamp.After(res[j].Timestamp)
+			}
+			return res[i].Timestamp.Before(res[j].Timestamp)
+
+		case "+score", "-score", "score":
+			if strings.HasPrefix(request.Sort, "-") {
+				return res[i].Score > res[j].Score
+			}
+			return res[i].Score < res[j].Score
+
+		default:
+			return res[i].Timestamp.Before(res[j].Timestamp)
+		}
+	})
+
 	return res, err
 }