/*

 Copyright 2019 The KubeSphere 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 resources

import (
	"kubesphere.io/kubesphere/pkg/informers"
	"kubesphere.io/kubesphere/pkg/server/params"
	"kubesphere.io/kubesphere/pkg/utils/k8sutil"
	"sort"
	"strings"
	"time"

	batchv1 "k8s.io/api/batch/v1"
	"k8s.io/apimachinery/pkg/labels"
)

type jobSearcher struct {
}

func (*jobSearcher) get(namespace, name string) (interface{}, error) {
	return informers.SharedInformerFactory().Batch().V1().Jobs().Lister().Jobs(namespace).Get(name)
}

func jobStatus(item *batchv1.Job) string {
	status := StatusFailed
	if item.Status.Active > 0 {
		status = StatusRunning
	} else if item.Status.Failed > 0 {
		status = StatusFailed
	} else if item.Status.Succeeded > 0 {
		status = StatusComplete
	}
	return status
}

// Exactly Match
func (*jobSearcher) match(kv map[string]string, item *batchv1.Job) bool {
	for k, v := range kv {
		switch k {
		case Status:
			if jobStatus(item) != v {
				return false
			}
		case includeCronJob:
			if v == "false" && k8sutil.IsControlledBy(item.OwnerReferences, cronJobKind, "") {
				return false
			}
		case includeS2iRun:
			if v == "false" && k8sutil.IsControlledBy(item.OwnerReferences, s2iRunKind, "") {
				return false
			}
		default:
			if !match(k, v, item.ObjectMeta) {
				return false
			}
		}
	}
	return true
}

func (*jobSearcher) fuzzy(kv map[string]string, item *batchv1.Job) bool {
	for k, v := range kv {
		if !fuzzy(k, v, item.ObjectMeta) {
			return false
		}
	}
	return true
}

func jobUpdateTime(item *batchv1.Job) time.Time {
	updateTime := item.CreationTimestamp.Time
	for _, condition := range item.Status.Conditions {
		if updateTime.Before(condition.LastProbeTime.Time) {
			updateTime = condition.LastProbeTime.Time
		}
		if updateTime.Before(condition.LastTransitionTime.Time) {
			updateTime = condition.LastTransitionTime.Time
		}
	}
	return updateTime
}

func (*jobSearcher) compare(a, b *batchv1.Job, orderBy string) bool {
	switch orderBy {
	case UpdateTime:
		aUpdateTime := jobUpdateTime(a)
		bUpdateTime := jobUpdateTime(b)
		if aUpdateTime.Equal(bUpdateTime) {
			return strings.Compare(a.Name, b.Name) <= 0
		}
		return aUpdateTime.Before(bUpdateTime)
	default:
		return compare(a.ObjectMeta, b.ObjectMeta, orderBy)
	}
}

func (s *jobSearcher) search(namespace string, conditions *params.Conditions, orderBy string, reverse bool) ([]interface{}, error) {
	jobs, err := informers.SharedInformerFactory().Batch().V1().Jobs().Lister().Jobs(namespace).List(labels.Everything())

	if err != nil {
		return nil, err
	}

	result := make([]*batchv1.Job, 0)

	if len(conditions.Match) == 0 && len(conditions.Fuzzy) == 0 {
		result = jobs
	} else {
		for _, item := range jobs {
			if s.match(conditions.Match, item) && s.fuzzy(conditions.Fuzzy, item) {
				result = append(result, item)
			}
		}
	}
	sort.Slice(result, func(i, j int) bool {
		if reverse {
			tmp := i
			i = j
			j = tmp
		}
		return s.compare(result[i], result[j], orderBy)
	})

	r := make([]interface{}, 0)
	for _, i := range result {
		r = append(r, i)
	}
	return r, nil
}