/*

 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 logging

import (
	"github.com/emicklei/go-restful"
	"k8s.io/klog"
	"kubesphere.io/kubesphere/pkg/api/logging/v1alpha2"
	"kubesphere.io/kubesphere/pkg/models/log"
	"kubesphere.io/kubesphere/pkg/server/errors"
	cs "kubesphere.io/kubesphere/pkg/simple/client"
	fb "kubesphere.io/kubesphere/pkg/simple/client/fluentbit"
	"kubesphere.io/kubesphere/pkg/utils/stringutils"
	"net/http"
	"strconv"
	"strings"
)

func LoggingQueryCluster(request *restful.Request, response *restful.Response) {
	res, err := logQuery(log.QueryLevelCluster, request)
	if err != nil {
		response.WriteHeaderAndEntity(http.StatusServiceUnavailable, err)
		return
	}

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func LoggingQueryWorkspace(request *restful.Request, response *restful.Response) {
	res, err := logQuery(log.QueryLevelWorkspace, request)
	if err != nil {
		response.WriteHeaderAndEntity(http.StatusServiceUnavailable, err)
		return
	}

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func LoggingQueryNamespace(request *restful.Request, response *restful.Response) {
	res, err := logQuery(log.QueryLevelNamespace, request)
	if err != nil {
		response.WriteHeaderAndEntity(http.StatusServiceUnavailable, err)
		return
	}

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func LoggingQueryWorkload(request *restful.Request, response *restful.Response) {
	res, err := logQuery(log.QueryLevelWorkload, request)
	if err != nil {
		response.WriteHeaderAndEntity(http.StatusServiceUnavailable, err)
		return
	}

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func LoggingQueryPod(request *restful.Request, response *restful.Response) {
	res, err := logQuery(log.QueryLevelPod, request)
	if err != nil {
		response.WriteHeaderAndEntity(http.StatusServiceUnavailable, err)
		return
	}

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}
	response.WriteAsJson(res)
}

func LoggingQueryContainer(request *restful.Request, response *restful.Response) {
	res, err := logQuery(log.QueryLevelContainer, request)
	if err != nil {
		response.WriteHeaderAndEntity(http.StatusServiceUnavailable, err)
		return
	}

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}
	response.WriteAsJson(res)
}

func LoggingQueryFluentbitOutputs(request *restful.Request, response *restful.Response) {
	res := log.FluentbitOutputsQuery()
	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}
	response.WriteAsJson(res)
}

func LoggingInsertFluentbitOutput(request *restful.Request, response *restful.Response) {

	var output fb.OutputPlugin
	var res *log.FluentbitOutputsResult

	err := request.ReadEntity(&output)
	if err != nil {
		klog.Errorln(err)
		response.WriteHeaderAndEntity(http.StatusBadRequest, errors.Wrap(err))
		return
	}

	res = log.FluentbitOutputInsert(output)
	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func LoggingUpdateFluentbitOutput(request *restful.Request, response *restful.Response) {

	var output fb.OutputPlugin

	id := request.PathParameter("output")

	err := request.ReadEntity(&output)
	if err != nil {
		klog.Errorln(err)
		response.WriteHeaderAndEntity(http.StatusBadRequest, errors.Wrap(err))
		return
	}

	res := log.FluentbitOutputUpdate(output, id)

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func LoggingDeleteFluentbitOutput(request *restful.Request, response *restful.Response) {

	var res *log.FluentbitOutputsResult

	id := request.PathParameter("output")
	res = log.FluentbitOutputDelete(id)

	if res.Status != http.StatusOK {
		response.WriteHeaderAndEntity(res.Status, errors.New(res.Error))
		return
	}

	response.WriteAsJson(res)
}

func logQuery(level log.LogQueryLevel, request *restful.Request) (*v1alpha2.QueryResult, error) {
	es, err := cs.ClientSets().ElasticSearch()
	if err != nil {
		klog.Error(err)
		return nil, err
	}

	var param v1alpha2.QueryParameters

	switch level {
	case log.QueryLevelCluster:
		var namespaces []string
		param.NamespaceNotFound, namespaces = log.MatchNamespace(stringutils.Split(request.QueryParameter("namespaces"), ","),
			stringutils.Split(strings.ToLower(request.QueryParameter("namespace_query")), ","), // case-insensitive
			stringutils.Split(request.QueryParameter("workspaces"), ","),
			stringutils.Split(strings.ToLower(request.QueryParameter("workspace_query")), ",")) // case-insensitive
		param.NamespaceWithCreationTime = log.MakeNamespaceCreationTimeMap(namespaces)
		param.WorkloadFilter = stringutils.Split(request.QueryParameter("workloads"), ",")
		param.WorkloadQuery = stringutils.Split(request.QueryParameter("workload_query"), ",")
		param.PodFilter = stringutils.Split(request.QueryParameter("pods"), ",")
		param.PodQuery = stringutils.Split(request.QueryParameter("pod_query"), ",")
		param.ContainerFilter = stringutils.Split(request.QueryParameter("containers"), ",")
		param.ContainerQuery = stringutils.Split(request.QueryParameter("container_query"), ",")
	case log.QueryLevelWorkspace:
		var namespaces []string
		param.NamespaceNotFound, namespaces = log.MatchNamespace(stringutils.Split(request.QueryParameter("namespaces"), ","),
			stringutils.Split(strings.ToLower(request.QueryParameter("namespace_query")), ","), // case-insensitive
			stringutils.Split(request.PathParameter("workspace"), ","), nil)                    // case-insensitive
		param.NamespaceWithCreationTime = log.MakeNamespaceCreationTimeMap(namespaces)
		param.WorkloadFilter = stringutils.Split(request.QueryParameter("workloads"), ",")
		param.WorkloadQuery = stringutils.Split(request.QueryParameter("workload_query"), ",")
		param.PodFilter = stringutils.Split(request.QueryParameter("pods"), ",")
		param.PodQuery = stringutils.Split(request.QueryParameter("pod_query"), ",")
		param.ContainerFilter = stringutils.Split(request.QueryParameter("containers"), ",")
		param.ContainerQuery = stringutils.Split(request.QueryParameter("container_query"), ",")
	case log.QueryLevelNamespace:
		namespaces := []string{request.PathParameter("namespace")}
		param.NamespaceWithCreationTime = log.MakeNamespaceCreationTimeMap(namespaces)
		param.WorkloadFilter = stringutils.Split(request.QueryParameter("workloads"), ",")
		param.WorkloadQuery = stringutils.Split(request.QueryParameter("workload_query"), ",")
		param.PodFilter = stringutils.Split(request.QueryParameter("pods"), ",")
		param.PodQuery = stringutils.Split(request.QueryParameter("pod_query"), ",")
		param.ContainerFilter = stringutils.Split(request.QueryParameter("containers"), ",")
		param.ContainerQuery = stringutils.Split(request.QueryParameter("container_query"), ",")
	case log.QueryLevelWorkload:
		namespaces := []string{request.PathParameter("namespace")}
		param.NamespaceWithCreationTime = log.MakeNamespaceCreationTimeMap(namespaces)
		param.WorkloadFilter = []string{request.PathParameter("workload")}
		param.PodFilter = stringutils.Split(request.QueryParameter("pods"), ",")
		param.PodQuery = stringutils.Split(request.QueryParameter("pod_query"), ",")
		param.ContainerFilter = stringutils.Split(request.QueryParameter("containers"), ",")
		param.ContainerQuery = stringutils.Split(request.QueryParameter("container_query"), ",")
	case log.QueryLevelPod:
		namespaces := []string{request.PathParameter("namespace")}
		param.NamespaceWithCreationTime = log.MakeNamespaceCreationTimeMap(namespaces)
		param.PodFilter = []string{request.PathParameter("pod")}
		param.ContainerFilter = stringutils.Split(request.QueryParameter("containers"), ",")
		param.ContainerQuery = stringutils.Split(request.QueryParameter("container_query"), ",")
	case log.QueryLevelContainer:
		namespaces := []string{request.PathParameter("namespace")}
		param.NamespaceWithCreationTime = log.MakeNamespaceCreationTimeMap(namespaces)
		param.PodFilter = []string{request.PathParameter("pod")}
		param.ContainerFilter = []string{request.PathParameter("container")}
	}

	param.LogQuery = stringutils.Split(request.QueryParameter("log_query"), ",")

	param.Operation = request.QueryParameter("operation")
	param.Interval = request.QueryParameter("interval")
	param.StartTime = request.QueryParameter("start_time")
	param.EndTime = request.QueryParameter("end_time")
	param.Sort = request.QueryParameter("sort")

	param.From, err = strconv.ParseInt(request.QueryParameter("from"), 10, 64)
	if err != nil {
		param.From = 0
	}
	param.Size, err = strconv.ParseInt(request.QueryParameter("size"), 10, 64)
	if err != nil {
		param.Size = 10
	}

	return es.Query(param), nil
}