From 0226c8da23282f9ca6f3dea9a7a60e0000d51471 Mon Sep 17 00:00:00 2001
From: Nazar Kanaev <nkanaev@live.com>
Date: Sun, 1 Nov 2020 15:27:20 +0000
Subject: [PATCH] fever item endpoint max_id parameter

---
 server/fever.go | 7 +++++++
 storage/item.go | 7 ++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/server/fever.go b/server/fever.go
index 220d3f7..da17490 100644
--- a/server/fever.go
+++ b/server/fever.go
@@ -218,6 +218,13 @@ func FeverItemsHandler(rw http.ResponseWriter, req *http.Request) {
 		}
 	}
 
+	if _, ok := query["max_id"]; ok {
+		idstr := query.Get("max_id")
+		if idnum, err := strconv.ParseInt(idstr, 10, 64); err == nil {
+			filter.MaxID = &idnum
+		}
+	}
+
 	items := db(req).ListItems(filter, 0, 50, true)
 
 	feverItems := make([]FeverItem, len(items))
diff --git a/storage/item.go b/storage/item.go
index d827c09..28710a2 100644
--- a/storage/item.go
+++ b/storage/item.go
@@ -65,6 +65,7 @@ type ItemFilter struct {
 
 	IDs      *[]int64
 	SinceID  *int64
+	MaxID    *int64
 }
 
 type MarkFilter struct {
@@ -164,6 +165,10 @@ func listQueryPredicate(filter ItemFilter) (string, []interface{}) {
 		cond = append(cond, "i.id > ?")
 		args = append(args, filter.SinceID)
 	}
+	if filter.MaxID != nil {
+		cond = append(cond, "i.id < ?")
+		args = append(args, filter.MaxID)
+	}
 
 	predicate := "1"
 	if len(cond) > 0 {
@@ -182,7 +187,7 @@ func (s *Storage) ListItems(filter ItemFilter, offset, limit int, newestFirst bo
 		order = "date asc"
 	}
 
-	if filter.IDs != nil || filter.SinceID != nil {
+	if filter.IDs != nil || filter.SinceID != nil || filter.MaxID != nil {
 		order = "i.id asc"
 	}