package routes

import (
	"context"
	"dashboard/controller"
	"dashboard/logger"
	"dashboard/pkg/jwt"
	"dashboard/settings"
	"errors"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/gin-contrib/cors"
	"github.com/gin-contrib/pprof"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
	"golang.org/x/sync/errgroup"
)

type Router struct {
	r    *gin.Engine
	addr string
	log  *logger.Logger
}

type AddRouter interface {
	AddRoute(*gin.Engine)
}

func NewRouter(addr string, log *logger.Logger, rate settings.RateLimitConfig, jwtC settings.JwtConfig, routes ...AddRouter) *Router {
	cjwt := jwt.New(jwt.WithSalt(jwtC.Salt), jwt.WithExpire(time.Duration(jwtC.Expire)*time.Second))

	r := gin.New()

	r.Use(cors.New(cors.Config{
		AllowOrigins:     []string{"*"},
		AllowMethods:     []string{"GET", "POST"},
		AllowHeaders:     []string{"Origin", "Content-Type"},
		ExposeHeaders:    []string{"Content-Length"},
		AllowCredentials: true,
		MaxAge:           12 * time.Hour,
	}))

	r.Use(GinLogger(log), GinRecovery(log, true), GinLog(log), ErrWapper(GinRateLimit(rate)))

	// 静态文件服务
	r.Static("/static", "./static")
	r.StaticFile("/", "./static/index.html")

	r.GET("login", controller.LoginPage)

	r.POST("/api/login", ErrWapper(controller.UserSignInHandler(cjwt)))
	r.POST("/api/logout", controller.UserLogOutHandler)

	g1 := r.Group("/api")
	g1.Use(ErrWapper(GinJwtAuthor(cjwt)))
	{
		g1.GET("/system-info", ErrWapper(controller.SystemInfoHandle))
		g1.POST("/upload", ErrWapper(controller.FileUploadHandle))
		g1.GET("/files", ErrWapper(controller.FileListHandle))
		g1.GET("/download", ErrWapper(controller.FileDownloadHandle))
	}

	r.GET("/ws/terminal", ErrWapper(GinJwtAuthor(cjwt)), ErrWapper(controller.TerminalHandle()))

	for _, route := range routes {
		route.AddRoute(r)
	}

	pprof.Register(r)

	return &Router{
		r:    r,
		addr: addr,
		log:  log,
	}
}

func (r *Router) Run(ctx context.Context) error {
	srv := &http.Server{
		Addr:    r.addr,
		Handler: r.r,
	}

	r.log.Sugar().Infof("Server listen on %s", r.addr)

	wg, ctx := errgroup.WithContext(ctx)
	wg.Go(func() error {
		// 开启一个goroutine启动服务
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			r.log.Error("listen: %s\n", zap.Error(err))

			return err
		}

		return nil
	})

	wg.Go(func() error {
		// 等待中断信号来优雅地关闭服务器，为关闭服务器操作设置一个5秒的超时
		quit := make(chan os.Signal, 1) // 创建一个接收信号的通道
		// kill 默认会发送 syscall.SIGTERM 信号
		// kill -2 发送 syscall.SIGINT 信号，我们常用的Ctrl+C就是触发系统SIGINT信号
		// kill -9 发送 syscall.SIGKILL 信号，但是不能被捕获，所以不需要添加它
		// signal.Notify把收到的 syscall.SIGINT或syscall.SIGTERM 信号转发给quit
		signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM) // 此处不会阻塞
		select {
		case <-ctx.Done():
			r.log.Error("Http Server Cancel by ctx")
		case <-quit:
		}
		// 阻塞在此，当接收到上述两种信号时才会往下执行
		r.log.Info("Shutdown Server ...")
		// 创建一个5秒超时的context
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		// 5秒内优雅关闭服务（将未处理完的请求处理完再关闭服务），超过5秒就超时退出
		if err := srv.Shutdown(ctx); err != nil {
			r.log.Error("Server Shutdown: ", zap.Error(err))

			return err
		}

		r.log.Info("Server exiting")

		return errors.New("Server Shutdown")
	})

	if err := wg.Wait(); err != nil {
		return err
	}

	return nil
}

/*
func Setup(log *logger.Logger, rate settings.RateLimitConfig, jwtC settings.JwtConfig) *gin.Engine {
	cjwt := jwt.New(jwt.WithSalt(jwtC.Salt), jwt.WithExpire(time.Duration(jwtC.Expire)*time.Second))

	r := gin.New()

	r.Use(cors.New(cors.Config{
		AllowOrigins:     []string{"*"},
		AllowMethods:     []string{"GET", "POST"},
		AllowHeaders:     []string{"Origin", "Content-Type"},
		ExposeHeaders:    []string{"Content-Length"},
		AllowCredentials: true,
		MaxAge:           12 * time.Hour,
	}))

	r.Use(GinLogger(log), GinRecovery(log, true), GinLog(log), errWapper(GinRateLimit(rate)))

	// 静态文件服务
	r.Static("/static", "./static")
	r.StaticFile("/", "./static/index.html")

	r.GET("login", controller.LoginPage)

	r.POST("/api/login", errWapper(controller.UserSignInHandler(cjwt)))
	r.POST("/api/logout", controller.UserLogOutHandler)

	g1 := r.Group("/api")
	g1.Use(errWapper(GinJwtAuthor(cjwt)))
	{
		g1.GET("/system-info", errWapper(controller.SystemInfoHandle))
		g1.POST("/upload", errWapper(controller.FileUploadHandle))
		g1.GET("/files", errWapper(controller.FileListHandle))
		g1.GET("/download", errWapper(controller.FileDownloadHandle))
	}

	r.GET("/ws/terminal", errWapper(GinJwtAuthor(cjwt)), errWapper(controller.TerminalHandle()))

	// unisr := r.Group("/api/unis")
	// unisr.Use(errWapper(GinCheckServerId), errWapper(GinStoreRequest))
	// {
	// 	unisr.POST("/config/v1/add", errWapper(unis.StationConfig))
	// }

	return r
}
*/