package main

import (
	"context"
	"flag"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"chat-agent-system/internal/bizdev"
	"chat-agent-system/internal/config"
	"chat-agent-system/internal/server"
)

func main() {
	envPath := flag.String("env", ".env", "环境配置文件路径")
	port := flag.Int("port", 0, "HTTP 服务端口 (默认读取配置文件或 8080)")
	host := flag.String("host", "", "HTTP 监听主机 (默认读取配置文件或 127.0.0.1)")
	backend := flag.String("backend", "", "智能体后端调度覆盖 (stub, pi-agent, cursor-cli)")
	flag.Parse()

	cfg, err := config.Load(*envPath)
	if err != nil {
		fmt.Fprintf(os.Stderr, "加载配置失败: %v\n", err)
		os.Exit(1)
	}

	if *port > 0 {
		cfg.HTTPPort = *port
	}
	if *host != "" {
		cfg.HTTPHost = *host
	}
	if *backend != "" {
		cfg.AgentBackend = *backend
	}

	svc := bizdev.NewService(cfg)
	srv := server.NewServer(cfg, svc)

	addr := fmt.Sprintf("%s:%d", cfg.HTTPHost, cfg.HTTPPort)
	fmt.Println("==================================================================")
	fmt.Println("   🤖 医疗器械商务与研发智能参谋系统 - HTTP / SSE API 守护服务   ")
	fmt.Println("==================================================================")
	fmt.Printf("服务环境: %s | 智能体后端: %s\n", cfg.Env, cfg.AgentBackend)
	fmt.Printf("监听地址: http://%s\n", addr)
	fmt.Println("核心服务路由:")
	fmt.Println("  • [GET]  /api/v1/health          - 服务健康检查与基础设施状态")
	fmt.Println("  • [GET]  /api/v1/projects        - 查询项目当前上下文与黑板事实")
	fmt.Println("  • [POST] /api/v1/chat            - 标准阻塞式对话协同接口")
	fmt.Println("  • [POST] /api/v1/chat/stream     - 核心 SSE 流式长连接对话协议 (分层按需)")
	fmt.Println("  • [GET]  /api/v1/chat/stream     - SSE 流式长连接对话调试接口 (EventSource)")
	fmt.Println("  • [POST] /api/v1/tasks/run/stream- 独立任务与阶段执行 SSE 监控流")
	fmt.Println("==================================================================")

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)

	go func() {
		if err := srv.Start(); err != nil && err != http.ErrServerClosed {
			fmt.Fprintf(os.Stderr, "服务启动失败: %v\n", err)
			os.Exit(1)
		}
	}()

	<-stop
	fmt.Println("\n正在优雅停止服务...")
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "服务停止异常: %v\n", err)
	} else {
		fmt.Println("服务已安全退出。")
	}
}