/*
Copyright 2016 The Rook Authors. All rights reserved.

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 utils

import (
	"fmt"
	"os"
	"path"
	"path/filepath"

	"github.com/pkg/errors"
	"github.com/rook/rook/pkg/util/exec"
)

const (
	HelmDeployName = "rook-ceph"
)

// HelmHelper is wrapper for running helm commands
type HelmHelper struct {
	executor *exec.CommandExecutor
	HelmPath string
}

// NewHelmHelper creates a instance of HelmHelper
func NewHelmHelper(helmPath string) *HelmHelper {
	executor := &exec.CommandExecutor{}
	return &HelmHelper{executor: executor, HelmPath: helmPath}

}

// Execute is wrapper for executing helm commands
func (h *HelmHelper) Execute(args ...string) (string, error) {
	result, err := h.executor.ExecuteCommandWithOutput(h.HelmPath, args...)
	if err != nil {
		logger.Errorf("Errors Encountered while executing helm command %v: %v", result, err)
		return result, fmt.Errorf("Failed to run helm commands on args %v : %v , err -> %v", args, result, err)

	}
	return result, nil

}

// InstallLocalRookHelmChart installs a give helm chart
func (h *HelmHelper) InstallLocalRookHelmChart(namespace, chartSettings string) error {
	rootDir, err := FindRookRoot()
	if err != nil {
		return errors.Wrap(err, "failed to find rook root")
	}
	chartDir := path.Join(rootDir, "cluster/charts/rook-ceph/")
	cmdArgs := []string{"install", "--create-namespace", HelmDeployName, chartDir, "-f", path.Join(chartDir, "values.yaml")}
	if namespace != "" {
		cmdArgs = append(cmdArgs, "--namespace", namespace)
	}
	if chartSettings != "" {
		cmdArgs = append(cmdArgs, "--set", chartSettings)
	}
	var result string
	result, err = h.Execute(cmdArgs...)
	if err == nil {
		return nil
	}

	logger.Errorf("cannot install helm chart with name : %v, namespace: %v  - %v , err: %v", HelmDeployName, namespace, result, err)
	return fmt.Errorf("cannot install helm chart with name : %v, namespace: %v - %v, err: %v", HelmDeployName, namespace, result, err)
}

// DeleteLocalRookHelmChart uninstalls a give helm deploy
func (h *HelmHelper) DeleteLocalRookHelmChart(namespace, deployName string) error {
	cmdArgs := []string{"delete", "-n", namespace, deployName}
	_, err := h.Execute(cmdArgs...)
	if err != nil {
		logger.Errorf("cannot delete helm chart with name  %v : %v", deployName, err)
		return fmt.Errorf("Failed to delete helm chart with name  %v : %v", deployName, err)
	}

	return nil
}

func FindRookRoot() (string, error) {
	const folderToFind = "tests"
	workingDirectory, err := os.Getwd()
	if err != nil {
		return "", fmt.Errorf("failed to find current working directory. %v", err)
	}
	parentPath := workingDirectory
	userHome, err := os.UserHomeDir()
	if err != nil {
		return "", fmt.Errorf("failed to find user home directory. %v", err)
	}
	for parentPath != userHome {
		fmt.Printf("parent path = %s\n", parentPath)
		_, err := os.Stat(path.Join(parentPath, folderToFind))
		if os.IsNotExist(err) {
			parentPath = filepath.Dir(parentPath)
			continue
		}
		return parentPath, nil
	}

	return "", fmt.Errorf("rook root not found above directory %s", workingDirectory)
}