package testgit

import (
	"os"
	"testing"

	objectid "codeberg.org/lindenii/furgit/object/id"
)

// RepoOptions controls git-init options for test repositories.
type RepoOptions struct {
	// ObjectFormat is the object ID algorithm used for repository objects.
	ObjectFormat objectid.Algorithm
	// Bare selects whether the repository is initialized as bare.
	Bare bool
	// RefFormat selects the git ref storage format (for example "files" or
	// "reftable"). Empty means git's default format.
	RefFormat string
}

// NewRepo creates a temporary repository initialized with the requested options.
func NewRepo(tb testing.TB, opts RepoOptions) *TestRepo {
	tb.Helper()

	algo := opts.ObjectFormat
	if algo.Size() == 0 {
		tb.Fatalf("invalid algorithm: %v", algo)
	}

	dir := tb.TempDir()

	testRepo := &TestRepo{
		dir:  dir,
		algo: algo,
		env:  defaultEnv(),
	}

	args := []string{"init", "--object-format=" + algo.String()}
	if opts.Bare {
		args = append(args, "--bare")
	}

	if opts.RefFormat != "" {
		args = append(args, "--ref-format="+opts.RefFormat)
	}

	args = append(args, dir)
	testRepo.runBytes(tb, nil, "", args...)

	return testRepo
}

func defaultEnv() []string {
	return append(os.Environ(),
		"GIT_CONFIG_GLOBAL=/dev/null",
		"GIT_CONFIG_SYSTEM=/dev/null",
		"GIT_AUTHOR_NAME=Test Author",
		"GIT_AUTHOR_EMAIL=test@example.org",
		"GIT_COMMITTER_NAME=Test Committer",
		"GIT_COMMITTER_EMAIL=committer@example.org",
		"GIT_AUTHOR_DATE=1234567890 +0000",
		"GIT_COMMITTER_DATE=1234567890 +0000",
	)
}