/*
Copyright 2019 The Kubernetes 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 openstacktasks

import (
	"fmt"

	sgr "github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/security/rules"
	"k8s.io/klog/v2"
	"k8s.io/kops/upup/pkg/fi"
	"k8s.io/kops/upup/pkg/fi/cloudup/openstack"
	"k8s.io/utils/net"
)

func Int(v int) *int {
	return &v
}

func IntValue(v *int) int {
	if v == nil {
		return 0
	}
	return *v
}

type SecurityGroupRule struct {
	ID             *string
	Name           *string
	Direction      *string
	EtherType      *string
	SecGroup       *SecurityGroup
	PortRangeMin   *int
	PortRangeMax   *int
	Protocol       *string
	RemoteIPPrefix *string
	RemoteGroup    *SecurityGroup
	Lifecycle      fi.Lifecycle
	Delete         *bool
}

// GetDependencies returns the dependencies of the Instance task
func (e *SecurityGroupRule) GetDependencies(tasks map[string]fi.CloudupTask) []fi.CloudupTask {
	var deps []fi.CloudupTask
	for _, task := range tasks {
		if _, ok := task.(*SecurityGroup); ok {
			deps = append(deps, task)
		}
	}
	return deps
}

var _ fi.CompareWithID = &SecurityGroupRule{}

func (r *SecurityGroupRule) CompareWithID() *string {
	return r.ID
}

func (r *SecurityGroupRule) Find(context *fi.CloudupContext) (*SecurityGroupRule, error) {
	if r.SecGroup == nil || r.SecGroup.ID == nil {
		return nil, nil
	}

	cloud := context.T.Cloud.(openstack.OpenstackCloud)

	opt := sgr.ListOpts{
		Direction:      fi.ValueOf(r.Direction),
		EtherType:      fi.ValueOf(r.EtherType),
		PortRangeMax:   IntValue(r.PortRangeMax),
		PortRangeMin:   IntValue(r.PortRangeMin),
		Protocol:       fi.ValueOf(r.Protocol),
		RemoteIPPrefix: fi.ValueOf(r.RemoteIPPrefix),
		SecGroupID:     fi.ValueOf(r.SecGroup.ID),
	}
	if r.RemoteGroup != nil {
		opt.RemoteGroupID = fi.ValueOf(r.RemoteGroup.ID)
	}
	rs, err := cloud.ListSecurityGroupRules(opt)
	if err != nil {
		return nil, err
	}
	n := len(rs)
	if n == 0 {
		return nil, nil
	} else if n != 1 {
		return nil, fmt.Errorf("found multiple SecurityGroupRules")
	}
	rule := rs[0]
	actual := &SecurityGroupRule{
		ID:             fi.PtrTo(rule.ID),
		Direction:      fi.PtrTo(rule.Direction),
		EtherType:      fi.PtrTo(rule.EtherType),
		PortRangeMax:   Int(rule.PortRangeMax),
		PortRangeMin:   Int(rule.PortRangeMin),
		Protocol:       fi.PtrTo(rule.Protocol),
		RemoteIPPrefix: fi.PtrTo(rule.RemoteIPPrefix),
		RemoteGroup:    r.RemoteGroup,
		SecGroup:       r.SecGroup,
		Lifecycle:      r.Lifecycle,
		Delete:         fi.PtrTo(false),
	}

	r.ID = actual.ID
	return actual, nil
}

func (r *SecurityGroupRule) Run(context *fi.CloudupContext) error {
	return fi.CloudupDefaultDeltaRunMethod(r, context)
}

func (*SecurityGroupRule) CheckChanges(a, e, changes *SecurityGroupRule) error {
	if a == nil {
		if e.Direction == nil {
			return fi.RequiredField("Direction")
		}
		if e.EtherType == nil {
			return fi.RequiredField("EtherType")
		}
		if e.SecGroup == nil {
			return fi.RequiredField("SecGroup")
		}
	} else {
		if changes.ID != nil {
			return fi.CannotChangeField("ID")
		}
		if changes.Direction != nil {
			return fi.CannotChangeField("Direction")
		}
		if changes.EtherType != nil {
			return fi.CannotChangeField("EtherType")
		}
		if changes.SecGroup != nil {
			return fi.CannotChangeField("SecGroup")
		}
	}
	return nil
}

func (*SecurityGroupRule) RenderOpenstack(t *openstack.OpenstackAPITarget, a, e, changes *SecurityGroupRule) error {
	if a == nil {
		klog.V(2).Infof("Creating SecurityGroupRule")
		etherType := fi.ValueOf(e.EtherType)
		if e.RemoteIPPrefix != nil {
			if net.IsIPv4CIDRString(*e.RemoteIPPrefix) {
				etherType = "IPv4"
			} else {
				etherType = "IPv6"
			}
		}
		opt := sgr.CreateOpts{
			Direction:      sgr.RuleDirection(fi.ValueOf(e.Direction)),
			EtherType:      sgr.RuleEtherType(etherType),
			SecGroupID:     fi.ValueOf(e.SecGroup.ID),
			PortRangeMax:   IntValue(e.PortRangeMax),
			PortRangeMin:   IntValue(e.PortRangeMin),
			Protocol:       sgr.RuleProtocol(fi.ValueOf(e.Protocol)),
			RemoteIPPrefix: fi.ValueOf(e.RemoteIPPrefix),
		}
		if e.RemoteGroup != nil {
			opt.RemoteGroupID = fi.ValueOf(e.RemoteGroup.ID)
		}

		r, err := t.Cloud.CreateSecurityGroupRule(opt)
		if err != nil {
			return fmt.Errorf("error creating SecurityGroupRule in SG %s: %v", fi.ValueOf(e.SecGroup.GetName()), err)
		}

		e.ID = fi.PtrTo(r.ID)
		return nil
	}

	klog.V(2).Infof("Openstack task SecurityGroupRule::RenderOpenstack did nothing")
	return nil
}

var _ fi.HasLifecycle = &SecurityGroupRule{}

// GetLifecycle returns the Lifecycle of the object, implementing fi.HasLifecycle
func (o *SecurityGroupRule) GetLifecycle() fi.Lifecycle {
	return o.Lifecycle
}

// SetLifecycle sets the Lifecycle of the object, implementing fi.SetLifecycle
func (o *SecurityGroupRule) SetLifecycle(lifecycle fi.Lifecycle) {
	o.Lifecycle = lifecycle
}

var _ fi.HasLifecycle = &SecurityGroupRule{}

// GetName returns the Name of the object, implementing fi.HasName
func (o *SecurityGroupRule) GetName() *string {
	name := o.String()
	return &name
}

// String is the stringer function for the task, producing readable output using fi.TaskAsString
func (o *SecurityGroupRule) String() string {
	var dst string
	if o.RemoteGroup != nil {
		dst = fi.ValueOf(o.RemoteGroup.Name)
	} else if o.RemoteIPPrefix != nil && fi.ValueOf(o.RemoteIPPrefix) != "" {
		dst = fi.ValueOf(o.RemoteIPPrefix)
	} else {
		dst = "ANY"
	}
	var proto string
	if o.Protocol == nil || fi.ValueOf(o.Protocol) == "" {
		proto = "AllProtos"
	} else {
		proto = fi.ValueOf(o.Protocol)
	}

	return fmt.Sprintf("%v-%v-%v-from-%v-to-%v-%v-%v", fi.ValueOf(o.EtherType), fi.ValueOf(o.Direction),
		proto, fi.ValueOf(o.SecGroup.Name), dst, fi.ValueOf(o.PortRangeMin), fi.ValueOf(o.PortRangeMax))
}

func (o *SecurityGroupRule) FindDeletions(c *fi.CloudupContext) ([]fi.CloudupDeletion, error) {
	if !fi.ValueOf(o.Delete) {
		return nil, nil
	}
	cloud := c.T.Cloud.(openstack.OpenstackCloud)
	rule, err := sgr.Get(cloud.NetworkingClient(), fi.ValueOf(o.ID)).Extract()
	if err != nil {
		return nil, err
	}
	return []fi.CloudupDeletion{
		&deleteSecurityGroupRule{
			rule:          *rule,
			securityGroup: o.SecGroup,
		},
	}, nil
}
