package gitcmd

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
)

func TestEmptyRepoReturnsEmpty(t *testing.T) {
	dir := t.TempDir()
	repoPath := filepath.Join(dir, "empty.git")
	if err := os.MkdirAll(repoPath, 0o755); err != nil {
		t.Fatal(err)
	}
	if out, err := exec.Command("git", "init", "--bare", repoPath).CombinedOutput(); err != nil {
		t.Fatalf("git init --bare: %v\n%s", err, out)
	}

	r, err := OpenRepository(context.Background(), repoPath)
	if err != nil {
		t.Fatal(err)
	}

	if empty, err := r.IsEmpty(); err != nil || !empty {
		t.Fatalf("IsEmpty() = (%v, %v), want (true, nil)", empty, err)
	}

	commits, err := r.ListCommits("HEAD", 20)
	if err != nil {
		t.Fatalf("ListCommits on empty repo: %v", err)
	}
	if len(commits) != 0 {
		t.Fatalf("ListCommits = %d items, want 0", len(commits))
	}

	tree, err := r.GetTree("HEAD", "")
	if err != nil {
		t.Fatalf("GetTree on empty repo: %v", err)
	}
	if len(tree.Entries) != 0 {
		t.Fatalf("GetTree = %d entries, want 0", len(tree.Entries))
	}

	contribs, err := r.GetContributors("HEAD")
	if err != nil {
		t.Fatalf("GetContributors on empty repo: %v", err)
	}
	if len(contribs) != 0 {
		t.Fatalf("GetContributors = %d items, want 0", len(contribs))
	}
}