/*

 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 job

import (
	"k8s.io/client-go/informers"
	"kubesphere.io/kubesphere/pkg/constants"
	"kubesphere.io/kubesphere/pkg/models/resources/v1alpha2"

	"kubesphere.io/kubesphere/pkg/server/params"
	"kubesphere.io/kubesphere/pkg/utils/k8sutil"
	"kubesphere.io/kubesphere/pkg/utils/sliceutil"
	"sort"
	"strings"
	"time"

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

const (
	includeCronJob = "includeCronJob"
	cronJobKind    = "CronJob"
	s2iRunKind     = "S2iRun"
	includeS2iRun  = "includeS2iRun"
)

type jobSearcher struct {
	informers informers.SharedInformerFactory
}

func NewJobSearcher(informers informers.SharedInformerFactory) v1alpha2.Interface {
	return &jobSearcher{informers: informers}
}

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

func jobStatus(item *batchv1.Job) string {
	status := v1alpha2.StatusFailed
	if item.Status.Active > 0 {
		status = v1alpha2.StatusRunning
	} else if item.Status.Failed > 0 {
		status = v1alpha2.StatusFailed
	} else if item.Status.Succeeded > 0 {
		status = v1alpha2.StatusComplete
	}
	return status
}

// Exactly Match
func (*jobSearcher) match(match map[string]string, item *batchv1.Job) bool {
	for k, v := range match {
		switch k {
		case v1alpha2.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
			}
		case v1alpha2.Name:
			names := strings.Split(v, "|")
			if !sliceutil.HasString(names, item.Name) {
				return false
			}
		case v1alpha2.Keyword:
			if !strings.Contains(item.Name, v) && !v1alpha2.SearchFuzzy(item.Labels, "", v) && !v1alpha2.SearchFuzzy(item.Annotations, "", v) {
				return false
			}
		default:
			// label not exist or value not equal
			if val, ok := item.Labels[k]; !ok || val != v {
				return false
			}
		}
	}
	return true
}

func (*jobSearcher) fuzzy(fuzzy map[string]string, item *batchv1.Job) bool {

	for k, v := range fuzzy {
		switch k {
		case v1alpha2.Name:
			if !strings.Contains(item.Name, v) && !strings.Contains(item.Annotations[constants.DisplayNameAnnotationKey], v) {
				return false
			}
		case v1alpha2.Label:
			if !v1alpha2.SearchFuzzy(item.Labels, "", v) {
				return false
			}
		case v1alpha2.Annotation:
			if !v1alpha2.SearchFuzzy(item.Annotations, "", v) {
				return false
			}
			return false
		case v1alpha2.App:
			if !strings.Contains(item.Labels[v1alpha2.Chart], v) && !strings.Contains(item.Labels[v1alpha2.Release], v) {
				return false
			}
		default:
			if !v1alpha2.SearchFuzzy(item.Labels, k, v) {
				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 v1alpha2.CreateTime:
		return a.CreationTimestamp.Time.Before(b.CreationTimestamp.Time)
	case v1alpha2.UpdateTime:
		return jobUpdateTime(a).Before(jobUpdateTime(b))
	case v1alpha2.Name:
		fallthrough
	default:
		return strings.Compare(a.Name, b.Name) <= 0
	}
}

func (s *jobSearcher) Search(namespace string, conditions *params.Conditions, orderBy string, reverse bool) ([]interface{}, error) {
	jobs, err := s.informers.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
}
