//go:build windows

package safeio

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

	"golang.org/x/sys/windows"
)

const expectedWindowsRetainedHandleShareMode = windows.FILE_SHARE_READ | windows.FILE_SHARE_WRITE

// Keep this contract compile-enforced so Windows cross-test compilation catches a future
// FILE_SHARE_DELETE regression even when the tests are compiled on a non-Windows host.
var _ [windowsRetainedHandleShareMode - expectedWindowsRetainedHandleShareMode]struct{}
var _ [expectedWindowsRetainedHandleShareMode - windowsRetainedHandleShareMode]struct{}

func TestOpenWindowsComponentBlocksMutationWhileHandleIsRetained(t *testing.T) {
	t.Run("parent rename", func(t *testing.T) {
		parent := filepath.Join(t.TempDir(), "parent")
		if err := os.Mkdir(parent, 0o700); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(parent, "secret"), []byte("secret"), 0o600); err != nil {
			t.Fatal(err)
		}

		handle, err := openWindowsComponent(parent, true)
		if err != nil {
			t.Fatal(err)
		}
		renamed := parent + "-renamed"
		if err := os.Rename(parent, renamed); err == nil {
			windows.CloseHandle(handle)
			t.Fatal("parent rename succeeded while its safe-I/O handle was retained")
		}
		if err := windows.CloseHandle(handle); err != nil {
			t.Fatal(err)
		}
		if err := os.Rename(parent, renamed); err != nil {
			t.Fatalf("parent rename after closing its safe-I/O handle: %v", err)
		}
	})

	t.Run("final delete", func(t *testing.T) {
		path := filepath.Join(t.TempDir(), "secret")
		if err := os.WriteFile(path, []byte("secret"), 0o600); err != nil {
			t.Fatal(err)
		}

		handle, err := openWindowsComponent(path, false)
		if err != nil {
			t.Fatal(err)
		}
		if err := os.Remove(path); err == nil {
			windows.CloseHandle(handle)
			t.Fatal("final-file deletion succeeded while its safe-I/O handle was retained")
		}
		if err := windows.CloseHandle(handle); err != nil {
			t.Fatal(err)
		}
		if err := os.Remove(path); err != nil {
			t.Fatalf("final-file deletion after closing its safe-I/O handle: %v", err)
		}
	})
}