// 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 apsara

import (
	"fmt"
	"strings"
	"time"

	"yunion.io/x/jsonutils"
	"yunion.io/x/log"
	"yunion.io/x/pkg/util/netutils"
	"yunion.io/x/pkg/util/rbacscope"
	"yunion.io/x/pkg/utils"

	api "yunion.io/x/cloudmux/pkg/apis/compute"
	"yunion.io/x/cloudmux/pkg/cloudprovider"
	"yunion.io/x/cloudmux/pkg/multicloud"
)

// {"AvailableIpAddressCount":4091,"CidrBlock":"172.31.32.0/20","CreationTime":"2017-03-19T13:37:44Z","Description":"System created default virtual switch.","IsDefault":true,"Status":"Available","VSwitchId":"vsw-j6c3gig5ub4fmi2veyrus","VSwitchName":"","VpcId":"vpc-j6c86z3sh8ufhgsxwme0q","ZoneId":"cn-hongkong-b"}

const (
	VSwitchPending   = "Pending"
	VSwitchAvailable = "Available"
)

type SCloudResources struct {
	CloudResourceSetType []string
}

type SVSwitch struct {
	multicloud.SNetworkBase
	ApsaraTags
	wire *SWire

	AvailableIpAddressCount int

	CidrBlock     string
	Ipv6CidrBlock string
	CreationTime  time.Time
	Description   string
	IsDefault     bool
	Status        string
	VSwitchId     string
	VSwitchName   string
	VpcId         string
	ZoneId        string

	CloudResources SCloudResources
	RouteTable     SRouteTable
	DepartmentInfo
}

func (self *SVSwitch) GetId() string {
	return self.VSwitchId
}

func (self *SVSwitch) GetName() string {
	if len(self.VSwitchName) > 0 {
		return self.VSwitchName
	}
	return self.VSwitchId
}

func (self *SVSwitch) GetGlobalId() string {
	return self.VSwitchId
}

func (self *SVSwitch) GetCreatedAt() time.Time {
	return self.CreationTime
}

func (self *SVSwitch) GetStatus() string {
	return strings.ToLower(self.Status)
}

func (self *SVSwitch) Refresh() error {
	log.Debugf("vsiwtch refresh %s", self.VSwitchId)
	new, err := self.wire.zone.region.GetVSwitchAttributes(self.VSwitchId)
	if err != nil {
		return err
	}
	return jsonutils.Update(self, new)
}

func (self *SVSwitch) GetIWire() cloudprovider.ICloudWire {
	return self.wire
}

func (self *SVSwitch) GetIpStart() string {
	pref, _ := netutils.NewIPV4Prefix(self.CidrBlock)
	startIp := pref.Address.NetAddr(pref.MaskLen) // 0
	startIp = startIp.StepUp()                    // 1
	return startIp.String()
}

func (self *SVSwitch) GetIpEnd() string {
	pref, _ := netutils.NewIPV4Prefix(self.CidrBlock)
	endIp := pref.Address.BroadcastAddr(pref.MaskLen) // 255
	endIp = endIp.StepDown()                          // 254
	endIp = endIp.StepDown()                          // 253
	endIp = endIp.StepDown()                          // 252
	return endIp.String()
}

func (self *SVSwitch) GetIpMask() int8 {
	pref, _ := netutils.NewIPV4Prefix(self.CidrBlock)
	return pref.MaskLen
}

func (self *SVSwitch) GetGateway() string {
	pref, _ := netutils.NewIPV4Prefix(self.CidrBlock)
	endIp := pref.Address.BroadcastAddr(pref.MaskLen) // 255
	endIp = endIp.StepDown()                          // 254
	return endIp.String()
}

func (self *SVSwitch) GetServerType() string {
	return api.NETWORK_TYPE_GUEST
}

func (self *SVSwitch) GetIsPublic() bool {
	// return self.IsDefault
	return true
}

func (self *SVSwitch) GetPublicScope() rbacscope.TRbacScope {
	return rbacscope.ScopeDomain
}

func (self *SRegion) createVSwitch(zoneId string, vpcId string, name string, cidr string, desc string) (string, error) {
	params := make(map[string]string)
	params["ZoneId"] = zoneId
	params["VpcId"] = vpcId
	params["CidrBlock"] = cidr
	params["VSwitchName"] = name
	if len(desc) > 0 {
		params["Description"] = desc
	}
	params["ClientToken"] = utils.GenRequestId(20)

	body, err := self.vpcRequest("CreateVSwitch", params)
	if err != nil {
		return "", err
	}
	return body.GetString("VSwitchId")
}

func (self *SRegion) DeleteVSwitch(vswitchId string) error {
	params := make(map[string]string)
	params["VSwitchId"] = vswitchId

	_, err := self.vpcRequest("DeleteVSwitch", params)
	return err
}

func (self *SVSwitch) Delete() error {
	err := self.Refresh()
	if err != nil {
		log.Errorf("refresh vswitch fail %s", err)
		return err
	}
	if len(self.RouteTable.RouteTableId) > 0 && !self.RouteTable.IsSystem() {
		err = self.wire.zone.region.UnassociateRouteTable(self.RouteTable.RouteTableId, self.VSwitchId)
		if err != nil {
			log.Errorf("unassociate routetable fail %s", err)
			return err
		}
	}
	err = self.dissociateWithSNAT()
	if err != nil {
		log.Errorf("fail to dissociateWithSNAT")
		return err
	}
	err = cloudprovider.Wait(10*time.Second, 60*time.Second, func() (bool, error) {
		err := self.wire.zone.region.DeleteVSwitch(self.VSwitchId)
		if err != nil {
			// delete network immediately after deleting vm on it
			// \"Code\":\"DependencyViolation\",\"Message\":\"Specified object has dependent resources.\"}
			if isError(err, "DependencyViolation") {
				return false, nil
			}
			return false, err
		} else {
			return true, nil
		}
	})
	return err
}

func (self *SVSwitch) GetAllocTimeoutSeconds() int {
	return 120 // 2 minutes
}

func (self *SRegion) GetVSwitches(ids []string, vpcId string, offset int, limit int) ([]SVSwitch, int, error) {
	if limit > 50 || limit <= 0 {
		limit = 50
	}
	params := make(map[string]string)
	params["RegionId"] = self.RegionId
	params["PageSize"] = fmt.Sprintf("%d", limit)
	params["PageNumber"] = fmt.Sprintf("%d", (offset/limit)+1)
	if ids != nil && len(ids) > 0 {
		params["VSwitchId"] = strings.Join(ids, ",")
	}
	if len(vpcId) > 0 {
		params["VpcId"] = vpcId
	}

	body, err := self.vpcRequest("DescribeVSwitches", params)
	if err != nil {
		log.Errorf("GetVSwitches fail %s", err)
		return nil, 0, err
	}

	switches := make([]SVSwitch, 0)
	err = body.Unmarshal(&switches, "VSwitches", "VSwitch")
	if err != nil {
		log.Errorf("Unmarshal vswitches fail %s", err)
		return nil, 0, err
	}
	total, _ := body.Int("TotalCount")
	return switches, int(total), nil
}

func (self *SRegion) GetVSwitchAttributes(idstr string) (*SVSwitch, error) {
	params := make(map[string]string)
	params["VSwitchId"] = idstr

	body, err := self.vpcRequest("DescribeVSwitchAttributes", params)
	if err != nil {
		log.Errorf("DescribeVSwitchAttributes fail %s", err)
		return nil, err
	}
	if self.client.debug {
		log.Debugf("%s", body.PrettyString())
	}
	switches := SVSwitch{}
	err = body.Unmarshal(&switches)
	if err != nil {
		log.Errorf("Unmarshal vswitches fail %s", err)
		return nil, err
	}
	return &switches, nil
}

func (vsw *SVSwitch) dissociateWithSNAT() error {
	natgatways, err := vsw.wire.vpc.getNatGateways()
	if err != nil {
		return err
	}
	for i := range natgatways {
		err = natgatways[i].dissociateWithVswitch(vsw.VSwitchId)
		if err != nil {
			return err
		}
	}
	return nil
}