/*
Copyright 2023 The KubeEdge Authors.

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 nodeupgradecontroller

import (
	"fmt"
	"time"

	fsmapi "github.com/kubeedge/api/apis/fsm/v1alpha1"
	v1alpha12 "github.com/kubeedge/api/apis/fsm/v1alpha1"
	"github.com/kubeedge/api/apis/operations/v1alpha1"
	"github.com/kubeedge/kubeedge/cloud/pkg/common/client"
	"github.com/kubeedge/kubeedge/pkg/util/fsm"
)

func currentUpgradeNodeState(id, nodeName string) (v1alpha12.State, error) {
	v, ok := cache.CacheMap.Load(id)
	if !ok {
		return "", fmt.Errorf("can not find task %s", id)
	}
	task := v.(*v1alpha1.NodeUpgradeJob)
	var state v1alpha12.State
	for _, status := range task.Status.Status {
		if status.NodeName == nodeName {
			state = status.State
			break
		}
	}
	if state == "" {
		state = v1alpha12.TaskInit
	}
	return state, nil
}

func updateUpgradeNodeState(id, nodeName string, state v1alpha12.State, event fsm.Event) error {
	v, ok := cache.CacheMap.Load(id)
	if !ok {
		return fmt.Errorf("can not find task %s", id)
	}
	task := v.(*v1alpha1.NodeUpgradeJob)
	newTask := task.DeepCopy()
	status := newTask.Status.DeepCopy()
	for i, nodeStatus := range status.Status {
		if nodeStatus.NodeName == nodeName {
			status.Status[i] = v1alpha1.TaskStatus{
				NodeName: nodeName,
				State:    state,
				Event:    event.Type,
				Action:   event.Action,
				Time:     time.Now().UTC().Format(time.RFC3339),
				Reason:   event.Msg,
			}
			break
		}
	}
	err := patchStatus(newTask, *status, client.GetCRDClient())
	if err != nil {
		return err
	}
	return nil
}

func NewUpgradeNodeFSM(taskName, nodeName string) *fsm.FSM {
	fsm := &fsm.FSM{}
	return fsm.NodeName(nodeName).ID(taskName).Guard(fsmapi.UpgradeRule).StageSequence(fsmapi.UpdateStageSequence).CurrentFunc(currentUpgradeNodeState).UpdateFunc(updateUpgradeNodeState)
}

func NewUpgradeTaskFSM(taskName string) *fsm.FSM {
	fsm := &fsm.FSM{}
	return fsm.ID(taskName).Guard(fsmapi.UpgradeRule).StageSequence(fsmapi.UpdateStageSequence).CurrentFunc(currentUpgradeTaskState).UpdateFunc(updateUpgradeTaskState)
}

func currentUpgradeTaskState(id, _ string) (v1alpha12.State, error) {
	v, ok := cache.CacheMap.Load(id)
	if !ok {
		return "", fmt.Errorf("can not find task %s", id)
	}
	task := v.(*v1alpha1.NodeUpgradeJob)
	state := task.Status.State
	if state == "" {
		state = v1alpha12.TaskInit
	}
	return state, nil
}

func updateUpgradeTaskState(id, _ string, state v1alpha12.State, event fsm.Event) error {
	v, ok := cache.CacheMap.Load(id)
	if !ok {
		return fmt.Errorf("can not find task %s", id)
	}
	task := v.(*v1alpha1.NodeUpgradeJob)
	newTask := task.DeepCopy()
	status := newTask.Status.DeepCopy()

	status.Event = event.Type
	status.Action = event.Action
	status.Reason = event.Msg
	status.State = state
	status.Time = time.Now().UTC().Format(time.RFC3339)

	err := patchStatus(newTask, *status, client.GetCRDClient())

	if err != nil {
		return err
	}
	return nil
}