/*
Copyright 2017 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 testing

import (
	"fmt"

	"k8s.io/apimachinery/pkg/util/sets"
)

// FakeNetlinkHandle mock implementation of proxy NetlinkHandle
type FakeNetlinkHandle struct {
	// localAddresses is a network interface name to all of its IP addresses map, e.g.
	// eth0 -> [1.2.3.4, 10.20.30.40]
	localAddresses map[string][]string
}

// NewFakeNetlinkHandle will create a new FakeNetlinkHandle
func NewFakeNetlinkHandle() *FakeNetlinkHandle {
	fake := &FakeNetlinkHandle{
		localAddresses: make(map[string][]string),
	}
	return fake
}

// EnsureAddressBind is a mock implementation
func (h *FakeNetlinkHandle) EnsureAddressBind(address, devName string) (exist bool, err error) {
	return false, nil
}

// UnbindAddress is a mock implementation
func (h *FakeNetlinkHandle) UnbindAddress(address, devName string) error {
	return nil
}

// EnsureDummyDevice is a mock implementation
func (h *FakeNetlinkHandle) EnsureDummyDevice(devName string) (bool, error) {
	return false, nil
}

// DeleteDummyDevice is a mock implementation
func (h *FakeNetlinkHandle) DeleteDummyDevice(devName string) error {
	return nil
}

// GetLocalAddresses is a mock implementation
func (h *FakeNetlinkHandle) GetLocalAddresses(filterDev string) (sets.String, error) {
	res := sets.NewString()
	if len(filterDev) != 0 {
		// list all addresses from a given network interface.
		for _, addr := range h.localAddresses[filterDev] {
			res.Insert(addr)
		}
		return res, nil
	}
	// If filterDev is not given, will list all addresses from all available network interface.
	for linkName := range h.localAddresses {
		// list all addresses from a given network interface.
		for _, addr := range h.localAddresses[linkName] {
			res.Insert(addr)
		}
	}
	return res, nil
}

// SetLocalAddresses set IP addresses to the given interface device.  It's not part of interface.
func (h *FakeNetlinkHandle) SetLocalAddresses(dev string, ips ...string) error {
	if h.localAddresses == nil {
		h.localAddresses = make(map[string][]string)
	}
	if len(dev) == 0 {
		return fmt.Errorf("device name can't be empty")
	}
	h.localAddresses[dev] = make([]string, 0)
	h.localAddresses[dev] = append(h.localAddresses[dev], ips...)
	return nil
}