// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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.

//go:build !windows

package claude

import (
	"errors"
	"fmt"
	"os"
	"os/exec"
	"syscall"
)

func configureProcessTree(command *exec.Cmd) {
	command.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
	command.Cancel = func() error {
		if command.Process == nil {
			return nil
		}
		return killProcessTree(command.Process)
	}
}

func killProcessTree(process *os.Process) error {
	if process == nil {
		return nil
	}
	killErr := syscall.Kill(-process.Pid, syscall.SIGKILL)
	if killErr == nil || errors.Is(killErr, syscall.ESRCH) {
		return nil
	}
	return fmt.Errorf("failed to kill Claude process group: %w", killErr)
}
