package main

import (
	"flag"
	"io/ioutil"
	"log"
	"os"
	"os/exec"

	"code.gitea.io/sdk/gitea"
	"github.com/facebookarchive/flagenv"
	"github.com/gogs/go-gogs-client"
	_ "github.com/joho/godotenv/autoload"
)

var (
	gogsApiKey    = flag.String("gogs-api-key", "", "gogs api key")
	gogsURL       = flag.String("gogs-url", "", "gogs url")
	gogsUsername  = flag.String("gogs-username", "", "gogs username")
	giteaApiKey   = flag.String("gitea-api-key", "", "gitea api key")
	giteaURL      = flag.String("gitea-url", "", "gitea url")
	giteaUsername = flag.String("gitea-username", "", "gitea username")
)

func main() {
	flagenv.Parse()
	flag.Parse()

	gogsClient := gogs.NewClient(*gogsURL, *gogsApiKey)
	giteaClient := gitea.NewClient(*giteaURL, *giteaApiKey)

	repos, err := gogsClient.ListMyRepos()
	if err != nil {
		log.Fatal(err)
	}

	for _, gogsRepo := range repos {
		log.Printf("gogs repo %s", gogsRepo.FullName)
		giteaRepo, err := giteaClient.GetRepo(*giteaUsername, gogsRepo.Name)
		if err == nil {
			log.Printf("skipping gogs repo %s", gogsRepo.FullName)
			continue
		}
		giteaRepo, err = giteaClient.CreateRepo(gitea.CreateRepoOption{
			Name:        gogsRepo.Name,
			Description: gogsRepo.Description,
			Private:     gogsRepo.Private,
		})
		if err != nil {
			log.Printf("can't create repo for gogs repo %s: %v, skipping", gogsRepo.FullName, err)
			continue
		}

		tmpDir, err := ioutil.TempDir("", "gogs2gitea")
		if err != nil {
			panic(err)
		}
		defer os.RemoveAll(tmpDir)

		cmd := exec.Command("git", "clone", "--bare", gogsRepo.SSHURL, tmpDir)
		err = cmd.Run()
		if err != nil {
			log.Printf("can't clone gogs repo %s: %v, skipping", gogsRepo.FullName, err)
			continue
		}

		cmd = exec.Command("git", "push", "--mirror", giteaRepo.SSHURL)
		cmd.Dir = tmpDir
		err = cmd.Run()
		if err != nil {
			log.Printf("can't push repo to gitea repo %s: %v, skipping", giteaRepo.FullName, err)
			continue
		}
	}
}