Added code for backend glue

backend/internal/http/handlers.go

@@ -0,0 +1,60 @@
+package http
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"mind/internal/glue"
+)
+
+// POST /conversations  {"title":"demo","owner_id":1}
+// GET  /conversations?owner_id=1
+func (s *server) conversations(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case http.MethodPost:
+		var in struct { Title string `json:"title"`; OwnerID int64 `json:"owner_id"` }
+		if err := json.NewDecoder(r.Body).Decode(&in); err != nil { writeJSON(w, 400, map[string]string{"error":"bad json"}); return }
+		id, err := s.glue.CreateConversation(r.Context(), in.OwnerID, in.Title)
+		if err != nil { writeJSON(w, 500, map[string]string{"error": err.Error()}); return }
+		writeJSON(w, 200, map[string]any{"id": id})
+	case http.MethodGet:
+		ownerStr := r.URL.Query().Get("owner_id")
+		owner, _ := strconv.ParseInt(ownerStr, 10, 64)
+		out, err := s.glue.ListConversations(r.Context(), owner)
+		if err != nil { writeJSON(w, 500, map[string]string{"error": err.Error()}); return }
+		writeJSON(w, 200, out)
+	default:
+		w.WriteHeader(405)
+	}
+}
+
+// POST /branches {conversation_id, name, head_node_id}
+func (s *server) branches(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost { w.WriteHeader(405); return }
+	var in glue.ForkReq
+	if err := json.NewDecoder(r.Body).Decode(&in); err != nil { writeJSON(w, 400, map[string]string{"error":"bad json"}); return }
+	b, err := s.glue.ForkBranch(r.Context(), in)
+	if err != nil { writeJSON(w, 500, map[string]string{"error": err.Error()}); return }
+	writeJSON(w, 200, b)
+}
+
+// POST /completion {conversation_id, branch, prompt}
+func (s *server) completion(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost { w.WriteHeader(405); return }
+	var in glue.CompletionReq
+	if err := json.NewDecoder(r.Body).Decode(&in); err != nil { writeJSON(w, 400, map[string]string{"error":"bad json"}); return }
+	resp, err := s.glue.AppendCompletion(r.Context(), in)
+	if err != nil { writeJSON(w, 500, map[string]string{"error": err.Error()}); return }
+	writeJSON(w, 200, resp)
+}
+
+// GET /linearize?conversation_id=..&branch=main
+func (s *server) linearize(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet { w.WriteHeader(405); return }
+	convID, _ := strconv.ParseInt(r.URL.Query().Get("conversation_id"), 10, 64)
+	branch := r.URL.Query().Get("branch")
+	out, err := s.glue.LinearizeByBranch(r.Context(), convID, branch)
+	if err != nil { writeJSON(w, 500, map[string]string{"error": err.Error()}); return }
+	writeJSON(w, 200, out)
+}