// Command dispatcher 启动 sundynix-dispatcher —— 第 4 层 AI Agent 调度集群。
package main

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

	"github.com/sundynix/sundynix-dispatcher/internal/eino"
	"github.com/sundynix/sundynix-dispatcher/internal/harness"
	"github.com/sundynix/sundynix-dispatcher/internal/llm"
	dnats "github.com/sundynix/sundynix-dispatcher/internal/nats"
)

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

	pool := llm.NewPool()                  // LLM Pool: vLLM / Ollama 集群
	breaker := harness.NewCircuitBreaker() // Harness: 熔断降级中心

	sub := dnats.MustConnect(natsURL)
	defer sub.Close()

	// sub 同时作为 Token 回流出口（TokenSink）。
	orch := eino.NewOrchestrator(pool, breaker, sub)

	// 监听退出信号，优雅停止消费。
	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	log.Println("[dispatcher] consuming sundynix.tasks.* (Ctrl-C to quit)")
	if err := sub.ConsumeTasks(ctx, orch.Handle); err != nil && err != context.Canceled {
		log.Fatalf("[dispatcher] exit: %v", err)
	}
}

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