// Copyright 2025 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix || (js && wasm) || wasip1

package os_test

import (
	"fmt"
	"os"
	"runtime"
	"syscall"
	"testing"
)

func TestRootChown(t *testing.T) {
	if runtime.GOOS == "wasip1" {
		t.Skip("Chown not supported on " + runtime.GOOS)
	}

	// Look up the current default uid/gid.
	f := newFile(t)
	dir, err := f.Stat()
	if err != nil {
		t.Fatal(err)
	}
	sys := dir.Sys().(*syscall.Stat_t)

	groups, err := os.Getgroups()
	if err != nil {
		t.Fatalf("getgroups: %v", err)
	}
	groups = append(groups, os.Getgid())
	for _, test := range rootTestCases {
		test.run(t, func(t *testing.T, target string, root *os.Root) {
			if target != "" {
				if err := os.WriteFile(target, nil, 0o666); err != nil {
					t.Fatal(err)
				}
			}
			for _, gid := range groups {
				err := root.Chown(test.open, -1, gid)
				if errEndsTest(t, err, test.wantError, "root.Chown(%q, -1, %v)", test.open, gid) {
					return
				}
				checkUidGid(t, target, int(sys.Uid), gid)
			}
		})
	}
}

func TestRootConsistencyChown(t *testing.T) {
	if runtime.GOOS == "wasip1" {
		t.Skip("Chown not supported on " + runtime.GOOS)
	}
	groups, err := os.Getgroups()
	if err != nil {
		t.Fatalf("getgroups: %v", err)
	}
	var gid int
	if len(groups) == 0 {
		gid = os.Getgid()
	} else {
		gid = groups[0]
	}
	for _, test := range rootConsistencyTestCases {
		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
			chown := os.Chown
			lstat := os.Lstat
			if r != nil {
				chown = r.Chown
				lstat = r.Lstat
			}
			err := chown(path, -1, gid)
			if err != nil {
				return "", err
			}
			fi, err := lstat(path)
			if err != nil {
				return "", err
			}
			sys := fi.Sys().(*syscall.Stat_t)
			return fmt.Sprintf("%v %v", sys.Uid, sys.Gid), nil
		})
	}
}