knowledge-graph-agent/backend/handlers/node_handler.go

package handlers

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"knowledge-graph-backend/services"
)

type NodeHandler struct {
	service services.GraphService
}

func NewNodeHandler(service services.GraphService) *NodeHandler {
	return &NodeHandler{
		service: service,
	}
}

func (h *NodeHandler) GetNodeByID(c *gin.Context) {
	nodeID := c.Param("id")
	if nodeID == "" {
		c.JSON(http.StatusBadRequest, gin.H{
			"error":   "Bad Request",
			"message": "Node ID is required",
		})
		return
	}

	node, found := h.service.GetNodeByID(nodeID)
	if !found {
		c.JSON(http.StatusNotFound, gin.H{
			"error":   "Not Found",
			"message": "Node with ID '" + nodeID + "' not found",
		})
		return
	}

	c.JSON(http.StatusOK, node)
}

func (h *NodeHandler) GetNeighbors(c *gin.Context) {
	nodeID := c.Param("id")
	if nodeID == "" {
		c.JSON(http.StatusBadRequest, gin.H{
			"error":   "Bad Request",
			"message": "Node ID is required",
		})
		return
	}

	neighbors, found := h.service.GetNeighbors(nodeID)
	if !found {
		c.JSON(http.StatusNotFound, gin.H{
			"error":   "Not Found",
			"message": "Node with ID '" + nodeID + "' not found",
		})
		return
	}

	c.JSON(http.StatusOK, neighbors)
}

func (h *NodeHandler) AddCustomHeaders(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"message": "With CORS headers",
		"origin":  c.Request.Header.Get("Origin"),
	})
}