search for a book with a single value

handlers/home/handler.go

@@ -3,6 +3,7 @@ package home
 import (
 	"bytes"
 	"fmt"
+	"librapi/services"
 	"librapi/templates"
 	"net/http"
 
@@ -11,11 +12,35 @@ import (
 
 const URL = "/"
 
-func Handler() func(http.ResponseWriter, *http.Request) {
+type SearchField struct {
+	Name  string
+	Value string
+	Err   string
+}
+
+type SearchForm struct {
+	Search  SearchField
+	Error   error
+	Method  string
+	Results []services.BookMetadata
+}
+
+func NewSearchForm() SearchForm {
+	return SearchForm{
+		Search: SearchField{
+			Name: "search",
+		},
+		Method: http.MethodPost,
+	}
+}
+
+func Handler(bs services.IStore) func(http.ResponseWriter, *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		switch r.Method {
 		case http.MethodGet:
 			getHome(w, r)
+		case http.MethodPost:
+			postHome(w, r, bs)
 		default:
 			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
 		}
@@ -26,7 +51,45 @@ func getHome(w http.ResponseWriter, _ *http.Request) {
 	home := templates.GetHome()
 
 	buf := bytes.NewBufferString("")
-	if err := home.Execute(buf, nil); err != nil {
+	if err := home.Execute(buf, &SearchForm{}); err != nil {
+		log.Err(err).Msg("unable to generate template")
+		http.Error(w, "unexpected error occurred", http.StatusInternalServerError)
+		return
+	}
+
+	fmt.Fprint(w, buf)
+}
+
+func extractSearchForm(r *http.Request) SearchForm {
+	sf := NewSearchForm()
+
+	sf.Search.Value = r.FormValue(sf.Search.Name)
+
+	return sf
+}
+
+func postHome(w http.ResponseWriter, r *http.Request, bs services.IStore) {
+	home := templates.GetHome()
+	buf := bytes.NewBufferString("")
+
+	sf := extractSearchForm(r)
+	bms, err := bs.Search(sf.Search.Value)
+	if err != nil {
+		sf.Error = err
+		if err := home.Execute(buf, sf); err != nil {
+			log.Err(err).Msg("unable to generate template")
+			http.Error(w, "unexpected error occurred", http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprint(w, buf.String())
+		return
+	}
+
+	sf.Results = bms
+
+	if err := home.Execute(buf, sf); err != nil {
 		log.Err(err).Msg("unable to generate template")
 		http.Error(w, "unexpected error occurred", http.StatusInternalServerError)
 		return