// Copyright 2026 Alibaba Group Holding Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package runtime

import (
	"os"
	"path/filepath"
	"testing"

	"github.com/stretchr/testify/require"
)

func TestValidateWorkingDir_empty(t *testing.T) {
	require.NoError(t, ValidateWorkingDir(""))
}

func TestValidateWorkingDir_notExist(t *testing.T) {
	tmp := t.TempDir()
	missing := filepath.Join(tmp, "definitely-missing-subdir")
	err := ValidateWorkingDir(missing)
	require.Error(t, err)
	require.Contains(t, err.Error(), "does not exist")
	require.Contains(t, err.Error(), missing)
}

func TestValidateWorkingDir_notDir(t *testing.T) {
	tmp := t.TempDir()
	f := filepath.Join(tmp, "file")
	require.NoError(t, os.WriteFile(f, []byte("x"), 0o600))
	err := ValidateWorkingDir(f)
	require.Error(t, err)
	require.Contains(t, err.Error(), "not a directory")
}

func TestValidateWorkingDir_ok(t *testing.T) {
	require.NoError(t, ValidateWorkingDir(t.TempDir()))
}

func TestValidateWorkingDir_ExpandsHome(t *testing.T) {
	home := t.TempDir()
	target := filepath.Join(home, "workspace")
	require.NoError(t, os.MkdirAll(target, 0o755))
	t.Setenv("HOME", home)
	t.Setenv("USERPROFILE", home)

	require.NoError(t, ValidateWorkingDir("~/workspace"))
}