package server

// chat_recategorize_api.go — 管理端点 POST /api/v1/chat/recategorize (Spec §3.4 A4)

import (
	"encoding/json"
	"net/http"
	"strings"
)

type recategorizeReq struct {
	SessionID string `json:"session_id"`
}

func (s *Server) handleChatRecategorize(w http.ResponseWriter, r *http.Request) {
	user, ok := s.requireAuthenticatedUser(w, r)
	if !ok {
		return
	}
	if s.ctxMgr() == nil {
		writeSafeError(w, r, http.StatusServiceUnavailable, "context manager unavailable")
		return
	}

	var req recategorizeReq
	if r.Body != nil {
		_ = json.NewDecoder(r.Body).Decode(&req)
	}
	req.SessionID = strings.TrimSpace(req.SessionID)
	if req.SessionID == "" {
		writeJSONResponse(w, http.StatusBadRequest, map[string]any{
			"success": false,
			"error":   "session_id is required",
		})
		return
	}
	if !s.isSystemAdminUser(r.Context(), user) {
		if !s.assertSessionOwnedByUser(w, r, req.SessionID, user.ID) {
			return
		}
	}

	res, err := s.ctxMgr().RecategorizeMessages(r.Context(), req.SessionID)
	if err != nil {
		writeJSONResponse(w, http.StatusInternalServerError, map[string]any{
			"success": false,
			"error":   err.Error(),
		})
		return
	}

	writeJSONResponse(w, http.StatusOK, map[string]any{
		"success":         true,
		"total_processed": res.TotalProcessed,
		"total_updated":   res.TotalUpdated,
	})
}