package main

import (
	"fmt"

	"github.com/fsnotify/fsnotify"
	"github.com/spf13/viper"
)

func main() {
	// 读取配置文件
	viper.SetConfigName("config")
	viper.SetConfigType("yaml")
	viper.AddConfigPath(".")

	if err := viper.ReadInConfig(); err != nil {
		panic(err)
	}

	fmt.Println("Initial config loaded")
	fmt.Printf("App Name: %s\n", viper.GetString("app.name"))
	fmt.Printf("App Port: %d\n", viper.GetInt("app.port"))

	// 监听配置文件变化
	viper.WatchConfig()
	viper.OnConfigChange(func(in fsnotify.Event) {
		fmt.Println("\n--- Config file changed! ---")
		fmt.Printf("Event: %s\n", in.Op.String())
		fmt.Printf("File: %s\n", in.Name)
		fmt.Printf("App Name: %s\n", viper.GetString("app.name"))
		fmt.Printf("App Port: %d\n", viper.GetInt("app.port"))
	})

	fmt.Println("\nWatching for config changes... (modify config.yaml to see changes)")
	fmt.Println("Press Ctrl+C to exit")

	// 保持程序运行
	select {}
}