package git

import (
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestServeBackendAdvertisement(t *testing.T) {
	root := t.TempDir()
	repoPath := filepath.Join(root, "josie", "demo.git")
	if err := InitBare(repoPath, "main"); err != nil {
		t.Fatalf("InitBare: %v", err)
	}

	req := httptest.NewRequest("GET", "/josie/demo.git/info/refs?service=git-upload-pack", nil)
	rec := httptest.NewRecorder()
	if err := ServeBackend(root, "", "git-upload-pack", req, rec); err != nil {
		t.Fatalf("ServeBackend: %v", err)
	}
	if rec.Code != 200 {
		t.Fatalf("status = %d, want 200 (body %q)", rec.Code, rec.Body)
	}
	if ct := rec.Header().Get("Content-Type"); ct != "application/x-git-upload-pack-advertisement" {
		t.Errorf("Content-Type = %q, want upload-pack advertisement", ct)
	}
	body := rec.Body.String()
	if !strings.HasPrefix(body, "001e# service=git-upload-pack\n0000") {
		t.Errorf("body lacks smart-HTTP service header, starts: %q", body)
	}
	if !strings.Contains(body, "0000000000000000000000000000000000000000 capabilities^{}") {
		t.Errorf("body lacks empty-repo zero-oid advertisement: %q", body)
	}
}

func TestServeBackendUnknownRepo(t *testing.T) {
	root := t.TempDir()
	if err := os.MkdirAll(filepath.Join(root, "josie"), 0o755); err != nil {
		t.Fatalf("mkdir: %v", err)
	}
	req := httptest.NewRequest("GET", "/josie/missing.git/info/refs?service=git-upload-pack", nil)
	rec := httptest.NewRecorder()
	if err := ServeBackend(root, "", "git-upload-pack", req, rec); err != nil {
		t.Fatalf("ServeBackend: %v", err)
	}
	if rec.Code != 404 {
		t.Errorf("status = %d, want 404 (body %q)", rec.Code, rec.Body)
	}
}