package main

import (
	"embed"
	"flag"
	"fmt"
	"io/fs"
	"net/http"
	"os/exec"
	"path"
	"runtime"
	"strings"
	"time"

	"bj_power_wms_client/internal/config"
	"bj_power_wms_client/internal/proxy"

	"github.com/zeromicro/go-zero/core/conf"
	"github.com/zeromicro/go-zero/core/logx"
	"github.com/zeromicro/go-zero/rest"
)

//go:embed all:web/static
var webFS embed.FS

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

// newStaticHandler 嵌入式静态文件：命中则直接返回；未命中的非 /api 路径
// 回退到 index.html（SPA history 路由），由浏览器端 Vue Router 接管。
func newStaticHandler(fsys embed.FS) http.Handler {
	sub, err := fs.Sub(fsys, "web/static")
	if err != nil {
		panic(fmt.Sprintf("嵌入静态目录不可用: %v", err))
	}
	fileServer := http.FileServer(http.FS(sub))
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		name := strings.TrimPrefix(path.Clean(r.URL.Path), "/")
		if name == "" {
			name = "index.html"
		}
		if f, openErr := sub.Open(name); openErr == nil {
			f.Close()
			fileServer.ServeHTTP(w, r)
			return
		}
		r2 := r.Clone(r.Context())
		r2.URL.Path = "/"
		fileServer.ServeHTTP(w, r2)
	})
}

// openBrowser 调用系统默认浏览器打开 url
func openBrowser(url string) {
	var cmd *exec.Cmd
	switch runtime.GOOS {
	case "windows":
		cmd = exec.Command("rundll32", "url.dll,FileProtocolHandler", url)
	case "darwin":
		cmd = exec.Command("open", url)
	default:
		cmd = exec.Command("xdg-open", url)
	}
	_ = cmd.Start()
}

func main() {
	flag.Parse()

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

	apiProxy := proxy.New(c.WmsAddr, c.ApiToken)
	staticHandler := newStaticHandler(webFS)

	// 兜底路由：/api/* 反向代理到 WMS 后端，其余走嵌入式静态资源（未命中回退 index.html）
	notFound := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.HasPrefix(r.URL.Path, "/api") {
			if r.URL.Path == "/api" || strings.HasPrefix(r.URL.Path, "/api/") {
				apiProxy.ServeHTTP(w, r)
				return
			}
			http.NotFound(w, r)
			return
		}
		staticHandler.ServeHTTP(w, r)
	})

	server := rest.MustNewServer(c.RestConf, rest.WithNotFoundHandler(notFound))
	defer server.Stop()

	fmt.Printf("Starting bj_power_wms_client at :%d...\n", c.Port)
	logx.Infof("Starting bj_power_wms_client at :%d...", c.Port)

	// 服务起来后自动打开浏览器访问前端
	host := c.Host
	if host == "0.0.0.0" || host == "" {
		host = "127.0.0.1"
	}
	go func() {
		time.Sleep(time.Second)
		openBrowser(fmt.Sprintf("http://%s:%d", host, c.Port))
	}()

	server.Start()
}