package main

import (
	"flag"
	"fmt"
	"net/http"
	{{.importPackages}}
)

var configFile = flag.String("f", "etc/{{.serviceName}}.yaml", "the config file")

func main() {
	flag.Parse()

	var c config.Config
	conf.MustLoad(*configFile, &c,conf.UseEnv())

	server := rest.MustNewServer(c.RestConf,rest.WithNotAllowedHandler(CorsHandler()))
	defer server.Stop()
	server.Use(CorsHandle)
	ctx := svc.NewServiceContext(c)
	handler.RegisterHandlers(server, ctx)

	fmt.Printf("Starting server at %s:%d...\n", c.Host, c.Port)
	server.Start()
}

// setHeader 设置响应头
func setHeader(w http.ResponseWriter) {
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.Header().Set("Access-Control-Allow-Headers", "*")
	w.Header().Set("Access-Control-Allow-Methods", "*")
	w.Header().Set("Access-Control-Expose-Headers", "Content-Length, Content-Type, Access-Control-Allow-Origin, Access-Control-Allow-Headers")
	w.Header().Set("Access-Control-Allow-Credentials", "true")
}

// CorsHandler 跨域请求处理器
func CorsHandler() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		setHeader(w)

		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusNoContent)
		} else {
			w.WriteHeader(http.StatusNotFound)
		}
	})
}

// Handle 跨域请求处理
func CorsHandle(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		setHeader(w)

		// 放行所有 OPTIONS 方法
		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusNoContent)
			return
		}

		// 处理请求
		next(w, r)
	}
}