package main

import (
	"errors"
	"fmt"
	"log"
	"os"
	"runtime"

	selfupdate "github.com/creativeprojects/go-selfupdate"
	"github.com/kenshaw/pemutil"
)

//go:generate sh injectGitVars.sh

var version = "v0.1.0"

func main() {
	if len(os.Args) < 2 {
		fmt.Println("provide a command")
		os.Exit(1)
	} else if os.Args[1] == "upgrade" || os.Args[1] == "up" {
		fmt.Println("Trying Upgrade... ")
		err := update(gitTag)
		if err != nil {
			fmt.Println(err)
		} else {
			fmt.Println("Success")
		}
	} else if os.Args[1] == "version" || os.Args[1] == "v" {
		fmt.Print("Version ")
		fmt.Println(gitTag)
	} else {
		fmt.Println("provide a valid command (version or upgrade)")
	}
}

func update(version string) error {
	source, _ := selfupdate.NewGiteaSource(selfupdate.GiteaConfig{BaseURL: "https://git.lbsfilm.at/"})

	store := make(pemutil.Store)
	err := pemutil.Decode(store, []byte(`-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE0+99Oxlx+P6F9Cd5pUIw6oGY2oFL
qCf//kV/S27OpD6skuEveQG+M1k6eT/o8oVDJ0sj3aIyaF+vruZaBB9HeA==
-----END PUBLIC KEY-----`))
	if err != nil {
		return err
	}
	pubkey, ok := store.ECPublicKey()
	if !ok {
		return fmt.Errorf("no pubkey")
	}
	updater, err := selfupdate.NewUpdater(selfupdate.Config{
		Source: source,
		Validator: &selfupdate.ECDSAValidator{
			PublicKey: pubkey,
		},
		OS:   runtime.GOOS,
		Arch: runtime.GOARCH,
		Arm:  0,
	})

	latest, found, err := updater.DetectLatest("lbsadmin/goselfupdatetest")
	if err != nil {
		return fmt.Errorf("error occurred while detecting version: %v", err)
	}
	if !found {
		return fmt.Errorf("latest version for %s/%s could not be found from github repository", runtime.GOOS, runtime.GOARCH)
	}

	if latest.LessOrEqual(version) {
		log.Printf("Current version (%s) is the latest", version)
		return nil
	}

	exe, err := os.Executable()
	if err != nil {
		return errors.New("could not locate executable path")
	}
	if err := updater.UpdateTo(latest, exe); err != nil {
		return fmt.Errorf("error occurred while updating binary: %v", err)
	}
	log.Printf("Successfully updated to version %s", latest.Version())
	return nil
}