backend barebone done, big chunk of work done

server/internal/api/contacts.go

@@ -0,0 +1,93 @@
+package api
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+
+	"messenger/internal/store"
+)
+
+func (h *apiHandler) searchUsers(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.Query().Get("q")
+	users, err := h.store.SearchUsers(r.Context(), query, 20)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal server error")
+		return
+	}
+	out := make([]userJSON, 0, len(users))
+	for i := range users {
+		out = append(out, toUserJSON(&users[i]))
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+type contactJSON struct {
+	User    userJSON `json:"user"`
+	AddedAt string   `json:"added_at"`
+}
+
+func (h *apiHandler) listContacts(w http.ResponseWriter, r *http.Request) {
+	userID, _ := userIDFrom(r.Context())
+	contacts, err := h.store.ListContacts(r.Context(), userID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal server error")
+		return
+	}
+	out := make([]contactJSON, 0, len(contacts))
+	for _, c := range contacts {
+		u, err := h.store.GetUserByID(r.Context(), c.ContactID)
+		if err != nil {
+			continue
+		}
+		out = append(out, contactJSON{User: toUserJSON(u), AddedAt: c.CreatedAt.Format("2006-01-02T15:04:05Z07:00")})
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+func (h *apiHandler) addContact(w http.ResponseWriter, r *http.Request) {
+	userID, _ := userIDFrom(r.Context())
+	var req struct {
+		UserID int64 `json:"user_id"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil || req.UserID <= 0 {
+		writeError(w, http.StatusBadRequest, "invalid user_id")
+		return
+	}
+	if req.UserID == userID {
+		writeError(w, http.StatusBadRequest, "cannot add yourself")
+		return
+	}
+	if _, err := h.store.GetUserByID(r.Context(), req.UserID); err != nil {
+		if errors.Is(err, store.ErrNotFound) {
+			writeError(w, http.StatusNotFound, "user not found")
+			return
+		}
+		writeError(w, http.StatusInternalServerError, "internal server error")
+		return
+	}
+	if err := h.store.AddContact(r.Context(), userID, req.UserID); err != nil {
+		if errors.Is(err, store.ErrDuplicate) {
+			writeJSON(w, http.StatusOK, map[string]string{"status": "already a contact"})
+			return
+		}
+		writeError(w, http.StatusInternalServerError, "internal server error")
+		return
+	}
+	writeJSON(w, http.StatusCreated, map[string]string{"status": "ok"})
+}
+
+func (h *apiHandler) removeContact(w http.ResponseWriter, r *http.Request) {
+	userID, _ := userIDFrom(r.Context())
+	contactID, err := strconv.ParseInt(r.PathValue("user_id"), 10, 64)
+	if err != nil || contactID <= 0 {
+		writeError(w, http.StatusBadRequest, "invalid user_id")
+		return
+	}
+	if err := h.store.RemoveContact(r.Context(), userID, contactID); err != nil {
+		writeError(w, http.StatusInternalServerError, "internal server error")
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}