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package main
import (
"encoding/json"
"log"
"net/http"
"regexp"
"strconv"
"git.huntm.net/wedding/server/guests"
)
type guestHandler struct {
store guestStore
}
type guestStore interface {
Get() (map[int]guests.Guest, error)
Add(id int, guest guests.Guest) error
Update(id int, guest guests.Guest) error
}
var (
guestRe = regexp.MustCompile(`^/guests/*$`)
guestIdRe = regexp.MustCompile(`^/guests/([0-9]+)$`)
)
func newGuestHandler(s guestStore) *guestHandler {
return &guestHandler{
store: s,
}
}
func (h *guestHandler) getGuests(w http.ResponseWriter, _ *http.Request) {
guests, err := h.store.Get()
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
}
jsonBytes, err := json.Marshal(guests)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
}
w.WriteHeader(http.StatusOK)
w.Write(jsonBytes)
}
func (h *guestHandler) createGuest(w http.ResponseWriter, r *http.Request) {
var guest guests.Guest
err := json.NewDecoder(r.Body).Decode(&guest)
defer r.Body.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = h.store.Add(guest.Id, guest)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusOK)
}
func (h *guestHandler) updateGuest(w http.ResponseWriter, r *http.Request) {
matches := guestIdRe.FindStringSubmatch(r.URL.Path)
if len(matches) < 2 {
http.Error(w, "No id found", http.StatusBadRequest)
}
var guest guests.Guest
err := json.NewDecoder(r.Body).Decode(&guest)
defer r.Body.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
}
id, err := strconv.Atoi(matches[1])
if err != nil {
http.Error(w, "Cannot convert string to integer", http.StatusBadRequest)
}
err = h.store.Update(id, guest)
if err != nil {
http.Error(w, "Guest not found", http.StatusBadRequest)
}
}
func (h *guestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch {
case r.Method == http.MethodGet && guestRe.MatchString(r.URL.Path):
h.getGuests(w, r)
case r.Method == http.MethodPost && guestRe.MatchString(r.URL.Path):
h.createGuest(w, r)
case r.Method == http.MethodPut && guestIdRe.MatchString(r.URL.Path):
h.updateGuest(w, r)
}
}
func main() {
store := guests.NewMemStore()
guestHandler := newGuestHandler(store)
mux := http.NewServeMux()
mux.Handle("/guests/", guestHandler)
log.Fatal(http.ListenAndServe(":8080", mux))
}
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