package main

import (
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/config"
)

func openRepo(dir *string, cfg *configFormat) *git.Repository {
	_, err := git.PlainClone(*dir, true, &git.CloneOptions{
		URL:          cfg.Sites.Upstream.FullURL(),
		Auth:         nil,
		RemoteName:   "upstream",
		SingleBranch: false,
		NoCheckout:   true,
	})
	if err != nil && err != git.ErrRepositoryAlreadyExists {
		panic(err)
	}

	repo, err := git.PlainOpen(*dir)
	if err != nil {
		panic(err)
	}

	_, err = repo.CreateRemote(&config.RemoteConfig{
		Name: "downstream",
		URLs: []string{cfg.Sites.Downstream.FullURL()},
	})
	if err != nil && err != git.ErrRemoteExists {
		panic(err)
	}

	err = repo.Fetch(&git.FetchOptions{
		RemoteName: "upstream",
	})
	if err != nil && err != git.NoErrAlreadyUpToDate {
		panic(err)
	}

	err = repo.Fetch(&git.FetchOptions{
		RemoteName: "downstream",
	})
	if err != nil && err != git.NoErrAlreadyUpToDate {
		panic(err)
	}

	return repo
}