// Command server 启动 sundynix-mcp-go —— 第 5 层 Go I/O 型 MCP 工具微服务。
package main

import (
	"context"
	"log"
	"os"
	"os/signal"
	"syscall"

	sharedbus "github.com/sundynix/sundynix-shared/bus"

	"github.com/sundynix/sundynix-mcp-go/internal/mcp"
	"github.com/sundynix/sundynix-mcp-go/internal/search"
)

func main() {
	natsURL := envOr("NATS_URL", "nats://localhost:4222")

	b, err := sharedbus.Connect(natsURL)
	if err != nil {
		log.Fatalf("[mcp_go] nats connect: %v", err)
	}
	defer b.Close()
	log.Printf("[mcp_go] connected %s", natsURL)

	engine := search.NewHybrid() // LLM Wiki 混合检索：Bleve + Milvus + Neo4j
	gw := mcp.NewGateway(b, engine)

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	log.Println("[mcp_go] serving MCP over sundynix.tools.go.* (Ctrl-C to quit)")
	if err := gw.Serve(ctx); err != nil && err != context.Canceled {
		log.Fatalf("[mcp_go] exit: %v", err)
	}
}

func envOr(key, def string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return def
}