update pagination

server/routers/recipe.go

@@ -2,8 +2,12 @@ package routers
 
 import (
 	"encoding/json"
+	"log"
 	"net/http"
 	"recipe-manager/data"
+	"recipe-manager/models"
+	"sort"
+	"strconv"
 
 	"github.com/go-chi/chi/v5"
 )
@@ -22,7 +26,34 @@ func (rr *RecipeRouter) Route(r chi.Router) {
 	r.Route("/recipes", func(r chi.Router) {
 		r.Get("/", func(w http.ResponseWriter, r *http.Request) {
 			w.Header().Add("Content-Type", "application/json")
-			json.NewEncoder(w).Encode(rr.data.GetRecipe())
+			var take, offset uint64 = 10, 0
+			if newOffset, err := strconv.ParseUint(r.URL.Query().Get("offset"), 10, 64); err == nil {
+				offset = newOffset
+			}
+
+			if newTake, err := strconv.ParseUint(r.URL.Query().Get("take"), 10, 64); err == nil {
+				take = newTake
+			}
+
+			// copy the strcut to avoid modifying the original
+			recipe := rr.data.GetRecipe()
+			isHasMore := len(recipe.Recipe01) >= int(take+offset)
+			if isHasMore {
+				recipe.Recipe01 = recipe.Recipe01[offset : take+offset]
+				sort.Slice(recipe.Recipe01, func(i, j int) bool {
+					return recipe.Recipe01[i].ID < recipe.Recipe01[j].ID
+				})
+			} else if len(recipe.Recipe01) > int(offset) {
+				log.Println("offset", offset, "len", len(recipe.Recipe01))
+				recipe.Recipe01 = recipe.Recipe01[offset:]
+			} else {
+				recipe.Recipe01 = []models.Recipe01{}
+			}
+
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"recipes": recipe,
+				"hasMore": isHasMore,
+			})
 		})
 	})
 }