From 2115122d59320f9652e0cb3879cf68d6df92805c Mon Sep 17 00:00:00 2001
From: Meutel <meutel@meutel.net>
Date: Wed, 2 Aug 2017 20:17:12 +0200
Subject: [PATCH] Offset/limit

---
 bouquins/bouquins.go | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/bouquins/bouquins.go b/bouquins/bouquins.go
index 44d8d96..81a874c 100644
--- a/bouquins/bouquins.go
+++ b/bouquins/bouquins.go
@@ -16,9 +16,11 @@ const (
 	TPL_SERIES  = "series.html"
 	TPL_INDEX   = "index.html"
 
-	PARAM_LIST  = "list"
-	PARAM_ORDER = "order"
-	PARAM_SORT  = "sort"
+	PARAM_LIST   = "list"
+	PARAM_ORDER  = "order"
+	PARAM_SORT   = "sort"
+	PARAM_LIMIT  = "limit"
+	PARAM_OFFSET = "offset"
 
 	LIST_AUTHORS = "authors"
 	LIST_SERIES  = "series"
@@ -162,6 +164,23 @@ func (app *Bouquins) render(res http.ResponseWriter, tpl string, model interface
 	}
 }
 
+func paramInt(name string, req *http.Request) int {
+	val := req.URL.Query().Get(name)
+	valInt, err := strconv.Atoi(val)
+	if err != nil {
+		log.Print("Invalid  value for", name, ":", val)
+		return 0
+	}
+	return valInt
+}
+func paramOrder(req *http.Request) string {
+	val := req.URL.Query().Get(PARAM_ORDER)
+	if val == "desc" || val == "asc" {
+		return val
+	}
+	return ""
+}
+
 // ROUTES //
 
 func (app *Bouquins) IndexPage(res http.ResponseWriter, req *http.Request) {
@@ -170,16 +189,17 @@ func (app *Bouquins) IndexPage(res http.ResponseWriter, req *http.Request) {
 		log.Print(err)
 	}
 	model := NewIndexModel("", count)
-	order, sort := req.URL.Query().Get(PARAM_ORDER), req.URL.Query().Get(PARAM_SORT)
+	order, sort := paramOrder(req), req.URL.Query().Get(PARAM_SORT)
+	limit, offset := paramInt(PARAM_LIMIT, req), paramInt(PARAM_OFFSET, req)
 	switch req.URL.Query().Get(PARAM_LIST) {
 	case LIST_AUTHORS:
-		model.Authors, err = app.AuthorsAdv(0, 0, sort, order)
+		model.Authors, err = app.AuthorsAdv(limit, offset, sort, order)
 	case LIST_SERIES:
-		model.Series, err = app.SeriesAdv(0, 0, sort, order)
+		model.Series, err = app.SeriesAdv(limit, offset, sort, order)
 	case LIST_BOOKS:
 		fallthrough
 	default:
-		model.Books, err = app.BooksAdv(0, 0, sort, order)
+		model.Books, err = app.BooksAdv(limit, offset, sort, order)
 	}
 	if err != nil {
 		log.Print(err)