//
// gin.go
// Copyright (C) 2023 tiglog <me@tiglog.com>
//
// Distributed under terms of the MIT license.
//

package gweb

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

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

type Engine = gin.Engine

type Context = gin.Context

type H = gin.H

const (
	ReleaseMode = gin.ReleaseMode
	DebugMode   = gin.DebugMode
	TestMode    = gin.TestMode
)

var New = gin.New
var SetMode = gin.SetMode
var Mode = gin.Mode

func RunWeb(app *Engine, addr string) {
	if addr[0] == ':' {
		addr = "127.0.0.1" + addr
	}
	srv := &http.Server{
		Addr:           addr,
		Handler:        app,
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}

	log.Printf("start web server http://%s ...\n", srv.Addr)
	go func() {
		var err error
		err = srv.ListenAndServe()
		if err != nil && errors.Is(err, http.ErrServerClosed) {
			log.Printf("listen: %s\n", err)
		}
	}()

	// Wait for interrupt signal to gracefully shutdown the server with
	// a timeout of 5 seconds.
	quit := make(chan os.Signal)
	// kill (no param) default send syscall.SIGTERM
	// kill -2 is syscall.SIGINT
	// kill -9 is syscall.SIGKILL but can't be caught, so don't need to add it
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	log.Print("Shutting down server...")

	// The context is used to inform the server it has 5 seconds to finish
	// the request it is currently handling
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

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

	log.Print("Server exiting")

}