/*
Copyright 2019 The Eliot Team.

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 util

import (
	"fmt"

	types "elcli/cmd/common"
)


//K8SInstTool embedes Common struct and contains the default K8S version and
//a flag depicting if host is an edge or cloud node
//It implements ToolsInstaller interface
type K8SInstTool struct {
	Common
	IsEdgeNode     bool //True - Edgenode False - Cloudnode
	DefaultToolVer string
}


//InstallTools sets the OS interface, checks if K8S installation is required or not.
//If required then install the said version.
func (ks *K8SInstTool) InstallTools() error {
	ks.SetOSInterface(GetOSInterface())
	ks.SetK8SVersionAndIsNodeFlag(ks.ToolVersion, ks.IsEdgeNode)

	component := "kubeadm"
	if ks.IsEdgeNode == true {
		component = "kubectl"
	}
	action, err := ks.IsK8SComponentInstalled(component, ks.DefaultToolVer)
	if err != nil {
		return err
	}
	switch action {
	case types.VersionNAInRepo:
		return fmt.Errorf("Expected %s version is not available in OS repo", component)
	case types.AlreadySameVersionExist:
		fmt.Printf("Same version of %s already installed in this host", component)
		return nil
	case types.DefVerInstallRequired:
		ks.SetK8SVersionAndIsNodeFlag(ks.DefaultToolVer, ks.IsEdgeNode)
		fallthrough
	case types.NewInstallRequired:
		err := ks.InstallK8S()
		if err != nil {
			return err
		}
	default:
		return fmt.Errorf("Error in getting the %s version from host", component)
	}
	return nil
}

//TearDown shoud uninstall K8S, but it is not required either for cloud or edge node.
//It is defined so that K8SInstTool implements ToolsInstaller interface
func (ks *K8SInstTool) TearDown() error {
	return nil
}