package main

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

	"api/config"
	"api/router"

	"github.com/gin-gonic/gin"
	"github.com/joho/godotenv"
)

func main() {
	// 加载环境变量
	if err := godotenv.Load(); err != nil {
		log.Println("No .env file found, using environment variables")
	}

	// 设置运行模式
	if os.Getenv("APP_ENV") == "production" {
		gin.SetMode(gin.ReleaseMode)
	} else {
		gin.SetMode(gin.DebugMode)
	}

	// 初始化配置
	cfg := config.New()

	// 初始化数据库连接
	if err := cfg.InitDB(); err != nil {
		log.Fatalf("Failed to initialize database: %v", err)
	}
	defer cfg.CloseDB()

	// 初始化 Redis 连接
	if err := cfg.InitRedis(); err != nil {
		log.Fatalf("Failed to initialize redis: %v", err)
	}
	defer cfg.CloseRedis()

	// 创建 Gin 引擎
	r := gin.New()

	// 使用中间件
	r.Use(gin.Logger())
	r.Use(gin.Recovery())

	// 注册路由
	router.RegisterRoutes(r, cfg)

	// 获取端口
	port := os.Getenv("APP_PORT")
	if port == "" {
		port = "8080"
	}

	// 创建 HTTP 服务器
	srv := &http.Server{
		Addr:    fmt.Sprintf(":%s", port),
		Handler: r,
	}

	// 优雅启停
	go func() {
		log.Printf("Server starting on port %s", port)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Failed to start server: %v", err)
		}
	}()

	// 等待中断信号
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	log.Println("Shutting down server...")

	// 设置关闭超时
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := srv.Shutdown(ctx); err != nil {
		log.Fatalf("Server forced to shutdown: %v", err)
	}

	log.Println("Server exited")
}