// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package task

import (
	"fmt"
	"strings"

	"github.com/pingcap/errors"
)

// Mkdir is used to create directory on the target host
type Mkdir struct {
	user string
	host string
	dirs []string
}

// Execute implements the Task interface
func (m *Mkdir) Execute(ctx *Context) error {
	exec, found := ctx.GetExecutor(m.host)
	if !found {
		return ErrNoExecutor
	}
	for _, dir := range m.dirs {
		if strings.Contains(dir, ",") {
			return fmt.Errorf("dir name contains invalid characters: %v", dir)
		}
	}

	cmd := fmt.Sprintf(
		`mkdir -p %[1]s && chown -R %[2]s:%[2]s %[1]s`,
		strings.Join(m.dirs, " "),
		m.user,
	)
	_, _, err := exec.Execute(cmd, true) // use root to create the dir
	if err != nil {
		return errors.Trace(err)
	}

	return nil
}

// Rollback implements the Task interface
func (m *Mkdir) Rollback(ctx *Context) error {
	return ErrUnsupportedRollback
}

// String implements the fmt.Stringer interface
func (m *Mkdir) String() string {
	return fmt.Sprintf("Mkdir: host=%s, directories='%s'", m.host, strings.Join(m.dirs, "','"))
}