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package main

import (
	"flag"
	"fmt"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"

	"go.jolheiser.com/tailroute"
)

// Args are commandline arguments
type Args struct {
	Hostname string
	AuthKey  string
	Funnel   bool
	DataDir  string
	Port     int
}

func main() {
	args := &Args{
		DataDir: ".tailproxy",
	}
	fs := flag.NewFlagSet("tailproxy", flag.ExitOnError)
	fs.StringVar(&args.Hostname, "hostname", args.Hostname, "Tailscale hostname")
	fs.StringVar(&args.AuthKey, "auth-key", args.AuthKey, "Tailscale auth key")
	fs.BoolVar(&args.Funnel, "funnel", args.Funnel, "Expose on Tailscale funnel")
	fs.StringVar(&args.DataDir, "data-dir", args.DataDir, "tsnet data directory")
	fs.IntVar(&args.Port, "port", args.Port, "Port to proxy")
	if err := fs.Parse(os.Args[1:]); err != nil {
		panic(err)
	}
	os.Setenv("TS_AUTHKEY", args.AuthKey)

	proxyURL, err := url.Parse(fmt.Sprintf("http://localhost:%d", args.Port))
	if err != nil {
		panic(err)
	}

	proxy := httputil.NewSingleHostReverseProxy(proxyURL)
	handler := http.HandlerFunc(proxy.ServeHTTP)

	r := tailroute.Router{
		Tailnet: handler,
	}
	if args.Funnel {
		r.Funnel = handler
	}

	if err := r.Serve(args.Hostname, args.DataDir); err != nil {
		panic(err)
	}
}