package main

import (
	"fmt"
	"io"
	"log"
	"net/url"
	"os"
	"strings"

	sr "tildegit.org/tjp/sliderule"
	"tildegit.org/tjp/sliderule/gemini"
)

func main() {
	if len(os.Args) < 2 {
		fmt.Fprintf(os.Stderr, "usage: %s <gemini url>\n", os.Args[0])
	}

	certfile, keyfile := envConfig()

	// build a client
	var client gemini.Client
	if certfile != "" && keyfile != "" {
		tlsConf, err := gemini.FileTLS(certfile, keyfile)
		if err != nil {
			log.Fatal(err)
		}
		client = gemini.NewClient(tlsConf)
	}

	// parse the URL and build the request
	request := &sr.Request{URL: buildURL(os.Args[1])}

	// fetch the response
	response, err := client.RoundTrip(request)
	if err != nil {
		log.Fatal(err)
	}
	defer response.Close()

	if response.Status != gemini.StatusSuccess {
		log.Fatalf("%d %s\n", response.Status, response.Meta)
	}

	if _, err := io.Copy(os.Stdout, response.Body); err != nil {
		log.Fatal(err)
	}
}

func envConfig() (string, string) {
	return os.Getenv("CLIENT_CERTIFICATE"), os.Getenv("CLIENT_PRIVATEKEY")
}

func buildURL(raw string) *url.URL {
	if strings.HasPrefix(raw, "//") {
		raw = "gemini:" + raw
	}

	u, err := url.Parse(raw)
	if err != nil {
		log.Fatal(err)
	}

	return u
}