// Copyright 2019 Yunion
//
// 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 eip

import (
	"context"
	"fmt"
	"time"

	"yunion.io/x/cloudmux/pkg/cloudprovider"
	"yunion.io/x/jsonutils"
	"yunion.io/x/log"
	"yunion.io/x/pkg/errors"

	api "yunion.io/x/onecloud/pkg/apis/compute"
	"yunion.io/x/onecloud/pkg/cloudcommon/db"
	"yunion.io/x/onecloud/pkg/cloudcommon/db/lockman"
	"yunion.io/x/onecloud/pkg/cloudcommon/db/taskman"
	"yunion.io/x/onecloud/pkg/cloudcommon/notifyclient"
	"yunion.io/x/onecloud/pkg/compute/models"
	"yunion.io/x/onecloud/pkg/util/logclient"
)

type EipAllocateTask struct {
	taskman.STask
}

func init() {
	taskman.RegisterTask(EipAllocateTask{})
}

func (self *EipAllocateTask) onFailed(ctx context.Context, eip *models.SElasticip, err error) {
	eip.SetStatus(ctx, self.UserCred, api.EIP_STATUS_ALLOCATE_FAIL, err.Error())
	self.setGuestAllocateEipFailed(eip, jsonutils.NewString(err.Error()))
	notifyclient.EventNotify(ctx, self.GetUserCred(), notifyclient.SEventNotifyParam{
		Obj:    eip,
		Action: notifyclient.ActionCreate,
		IsFail: true,
	})
	self.SetStageFailed(ctx, jsonutils.NewString(err.Error()))
}

func (self *EipAllocateTask) setGuestAllocateEipFailed(eip *models.SElasticip, reason jsonutils.JSONObject) {
	if eip != nil {
		db.OpsLog.LogEvent(eip, db.ACT_ALLOCATE_FAIL, reason, self.GetUserCred())
		logclient.AddActionLogWithStartable(self, eip, logclient.ACT_ALLOCATE, reason, self.UserCred, false)
	}
	if self.Params != nil && self.Params.Contains("instance_id") {
		instanceId, _ := self.Params.GetString("instance_id")
		instance, err := models.GuestManager.FetchById(instanceId)
		if err != nil {
			log.Errorf("failed to find guest by id: %s error: %v", instanceId, err)
			return
		}
		guest := instance.(*models.SGuest)
		guest.SetStatus(context.Background(), self.UserCred, api.INSTANCE_ASSOCIATE_EIP_FAILED, reason.String())
	}
}

func (self *EipAllocateTask) OnInit(ctx context.Context, obj db.IStandaloneModel, data jsonutils.JSONObject) {
	var (
		eip          = obj.(*models.SElasticip)
		eipIsManaged = eip.IsManaged()
	)

	args := &cloudprovider.SEip{
		Name:          eip.Name,
		BandwidthMbps: eip.Bandwidth,
		ChargeType:    string(eip.ChargeType),
		BGPType:       eip.BgpType,
		Ip:            eip.IpAddr,
	}
	args.Tags, _ = eip.GetAllUserMetadata()

	if eip.NetworkId != "" {
		_network, err := models.NetworkManager.FetchById(eip.NetworkId)
		if err != nil {
			self.onFailed(ctx, eip, errors.Wrapf(err, "NetworkManager.FetchById(%s)", eip.NetworkId))
			return
		}
		network := _network.(*models.SNetwork)
		reqIp, _ := self.GetParams().GetString("ip_addr")
		if len(eip.IpAddr) == 0 && (reqIp != "" || !eipIsManaged) {
			lockman.LockObject(ctx, network)
			defer lockman.ReleaseObject(ctx, network)

			ipAddr, err := network.GetFreeIP(ctx, self.UserCred, nil, nil, reqIp, api.IPAllocationNone, false, api.AddressTypeIPv4)
			if err != nil {
				self.onFailed(ctx, eip, errors.Wrapf(err, "GetFreeIP(%s)", reqIp))
				return
			}
			if reqIp != "" && ipAddr != reqIp {
				self.onFailed(ctx, eip, fmt.Errorf("requested ip %s is occupied!", reqIp))
				return
			}
			_, err = db.Update(eip, func() error {
				eip.IpAddr = ipAddr
				eip.BgpType = network.BgpType
				return nil
			})
			if err != nil {
				self.onFailed(ctx, eip, errors.Wrapf(err, "db.Update"))
				return
			}
		}
		if !eipIsManaged {
			eip.SetStatus(ctx, self.UserCred, api.EIP_STATUS_READY, "allocated from network")
		}
		args.NetworkExternalId = network.ExternalId
	}

	if eipIsManaged {
		var err error

		_cloudprovider := eip.GetCloudprovider()
		args.ProjectId, err = _cloudprovider.SyncProject(ctx, self.GetUserCred(), eip.ProjectId)
		if err != nil {
			if errors.Cause(err) != cloudprovider.ErrNotSupported && errors.Cause(err) != cloudprovider.ErrNotImplemented {
				logclient.AddSimpleActionLog(eip, logclient.ACT_SYNC_CLOUD_PROJECT, err, self.UserCred, false)
			}
		}

		iregion, err := eip.GetIRegion(ctx)
		if err != nil {
			eip.SetStatus(ctx, self.UserCred, api.EIP_STATUS_ALLOCATE_FAIL, "")
			self.onFailed(ctx, eip, errors.Wrapf(err, "eip.GetIRegion"))
			return
		}

		extEip, err := iregion.CreateEIP(args)
		if err != nil {
			eip.SetStatus(ctx, self.UserCred, api.EIP_STATUS_ALLOCATE_FAIL, "")
			self.onFailed(ctx, eip, errors.Wrapf(err, "iregion.CreateEIP"))
			return
		}

		cloudprovider.WaitStatus(extEip, api.EIP_STATUS_READY, time.Second*5, time.Minute*3)

		if err := eip.SyncWithCloudEip(ctx, self.UserCred, eip.GetCloudprovider(), extEip, nil); err != nil {
			eip.SetStatus(ctx, self.UserCred, api.EIP_STATUS_ALLOCATE_FAIL, "")
			self.onFailed(ctx, eip, errors.Wrapf(err, "ip.SyncWithCloudEip"))
			return
		}
	}

	if self.Params != nil && self.Params.Contains("instance_id") {
		self.SetStage("OnEipAssociateComplete", nil)
		if err := eip.StartEipAssociateTask(ctx, self.UserCred, self.Params, self.GetId()); err != nil {
			msg := fmt.Sprintf("start associate task fail %s", err)
			self.SetStageFailed(ctx, jsonutils.NewString(msg))
		}
	} else {
		logclient.AddActionLogWithStartable(self, eip, logclient.ACT_ALLOCATE, nil, self.UserCred, true)
		notifyclient.EventNotify(ctx, self.UserCred, notifyclient.SEventNotifyParam{
			Obj:    eip,
			Action: notifyclient.ActionCreate,
		})
		self.SetStageComplete(ctx, nil)
	}
}

func (self *EipAllocateTask) OnEipAssociateComplete(ctx context.Context, obj db.IStandaloneModel, data jsonutils.JSONObject) {
	eip := obj.(*models.SElasticip)
	logclient.AddActionLogWithStartable(self, eip, logclient.ACT_ALLOCATE, nil, self.UserCred, true)
	self.SetStageComplete(ctx, nil)
}

func (self *EipAllocateTask) OnEipAssociateCompleteFailed(ctx context.Context, obj db.IStandaloneModel, data jsonutils.JSONObject) {
	eip := obj.(*models.SElasticip)
	self.setGuestAllocateEipFailed(eip, data)
	self.SetStageFailed(ctx, data)
}