/*
Copyright 2014 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 net

import (
	"net"
	"reflect"
	"sort"
	"testing"
)

func parseIPNet(s string) *net.IPNet {
	_, net, err := ParseCIDRSloppy(s)
	if err != nil {
		panic(err)
	}
	return net
}

func TestIPNets(t *testing.T) {
	s := IPNetSet{}
	s2 := IPNetSet{}
	if len(s) != 0 {
		t.Errorf("Expected len=0: %d", len(s))
	}
	a := parseIPNet("1.0.0.0/8")
	b := parseIPNet("2.0.0.0/8")
	c := parseIPNet("3.0.0.0/8")
	d := parseIPNet("4.0.0.0/8")

	s.Insert(a, b)
	if len(s) != 2 {
		t.Errorf("Expected len=2: %d", len(s))
	}
	s.Insert(c)
	if s.Has(d) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if !s.Has(a) {
		t.Errorf("Missing contents: %#v", s)
	}
	s.Delete(a)
	if s.Has(a) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	s.Insert(a)
	if s.HasAll(a, b, d) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if !s.HasAll(a, b) {
		t.Errorf("Missing contents: %#v", s)
	}
	s2.Insert(a, b, d)
	if s.IsSuperset(s2) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	s2.Delete(d)
	if !s.IsSuperset(s2) {
		t.Errorf("Missing contents: %#v", s)
	}
}

func TestIPNetSetDeleteMultiples(t *testing.T) {
	s := IPNetSet{}
	a := parseIPNet("1.0.0.0/8")
	b := parseIPNet("2.0.0.0/8")
	c := parseIPNet("3.0.0.0/8")

	s.Insert(a, b, c)
	if len(s) != 3 {
		t.Errorf("Expected len=3: %d", len(s))
	}

	s.Delete(a, c)
	if len(s) != 1 {
		t.Errorf("Expected len=1: %d", len(s))
	}
	if s.Has(a) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if s.Has(c) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if !s.Has(b) {
		t.Errorf("Missing contents: %#v", s)
	}
}

func TestNewIPNetSet(t *testing.T) {
	s, err := ParseIPNets("1.0.0.0/8", "2.0.0.0/8", "3.0.0.0/8")
	if err != nil {
		t.Errorf("error parsing IPNets: %v", err)
	}
	if len(s) != 3 {
		t.Errorf("Expected len=3: %d", len(s))
	}
	a := parseIPNet("1.0.0.0/8")
	b := parseIPNet("2.0.0.0/8")
	c := parseIPNet("3.0.0.0/8")

	if !s.Has(a) || !s.Has(b) || !s.Has(c) {
		t.Errorf("Unexpected contents: %#v", s)
	}
}

func TestIPNetSetDifference(t *testing.T) {
	l, err := ParseIPNets("1.0.0.0/8", "2.0.0.0/8", "3.0.0.0/8")
	if err != nil {
		t.Errorf("error parsing IPNets: %v", err)
	}
	r, err := ParseIPNets("1.0.0.0/8", "2.0.0.0/8", "4.0.0.0/8", "5.0.0.0/8")
	if err != nil {
		t.Errorf("error parsing IPNets: %v", err)
	}
	c := l.Difference(r)
	d := r.Difference(l)
	if len(c) != 1 {
		t.Errorf("Expected len=1: %d", len(c))
	}
	if !c.Has(parseIPNet("3.0.0.0/8")) {
		t.Errorf("Unexpected contents: %#v", c)
	}
	if len(d) != 2 {
		t.Errorf("Expected len=2: %d", len(d))
	}
	if !d.Has(parseIPNet("4.0.0.0/8")) || !d.Has(parseIPNet("5.0.0.0/8")) {
		t.Errorf("Unexpected contents: %#v", d)
	}
}

func TestIPNetSetList(t *testing.T) {
	s, err := ParseIPNets("3.0.0.0/8", "1.0.0.0/8", "2.0.0.0/8")
	if err != nil {
		t.Errorf("error parsing IPNets: %v", err)
	}
	l := s.StringSlice()
	sort.Strings(l)
	if !reflect.DeepEqual(l, []string{"1.0.0.0/8", "2.0.0.0/8", "3.0.0.0/8"}) {
		t.Errorf("List gave unexpected result: %#v", l)
	}
}

func TestIPSet(t *testing.T) {
	s := IPSet{}
	s2 := IPSet{}

	a := ParseIPSloppy("1.0.0.0")
	b := ParseIPSloppy("2.0.0.0")
	c := ParseIPSloppy("3.0.0.0")
	d := ParseIPSloppy("4.0.0.0")

	s.Insert(a, b)
	if len(s) != 2 {
		t.Errorf("Expected len=2: %d", len(s))
	}
	if !s.Has(a) {
		t.Errorf("Missing contents: %#v", s)
	}

	s.Insert(c)
	if s.Has(d) {
		t.Errorf("Unexpected contents: %#v", s)
	}

	s.Delete(a)
	if s.Has(a) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	s.Insert(a)
	if s.HasAll(a, b, d) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if !s.HasAll(a, b) {
		t.Errorf("Missing contents: %#v", s)
	}
	s2.Insert(a, b, d)
	if s.IsSuperset(s2) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	s2.Delete(d)
	if !s.IsSuperset(s2) {
		t.Errorf("Missing contents: %#v", s)
	}
}

func TestIPSetDeleteMultiples(t *testing.T) {
	s := IPSet{}
	a := ParseIPSloppy("1.0.0.0")
	b := ParseIPSloppy("2.0.0.0")
	c := ParseIPSloppy("3.0.0.0")

	s.Insert(a, b, c)
	if len(s) != 3 {
		t.Errorf("Expected len=3: %d", len(s))
	}

	s.Delete(a, c)
	if len(s) != 1 {
		t.Errorf("Expected len=1: %d", len(s))
	}
	if s.Has(a) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if s.Has(c) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	if !s.Has(b) {
		t.Errorf("Missing contents: %#v", s)
	}
}

func TestParseIPSet(t *testing.T) {
	s, err := ParseIPSet("1.0.0.0", "2.0.0.0", "3.0.0.0", "::ffff:4.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}
	if len(s) != 4 {
		t.Errorf("Expected len=3: %d", len(s))
	}
	a := ParseIPSloppy("1.0.0.0")
	b := ParseIPSloppy("2.0.0.0")
	c := ParseIPSloppy("3.0.0.0")
	d := ParseIPSloppy("::ffff:4.0.0.0")
	e := ParseIPSloppy("4.0.0.0")

	if !s.Has(a) || !s.Has(b) || !s.Has(c) || !s.Has(d) || !s.Has(e) {
		t.Errorf("Unexpected contents: %#v", s)
	}
}

func TestIPSetDifference(t *testing.T) {
	l, err := ParseIPSet("1.0.0.0", "2.0.0.0", "3.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}
	r, err := ParseIPSet("1.0.0.0", "2.0.0.0", "4.0.0.0", "5.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}
	c := l.Difference(r)
	d := r.Difference(l)
	if len(c) != 1 {
		t.Errorf("Expected len=1: %d", len(c))
	}
	if !c.Has(ParseIPSloppy("3.0.0.0")) {
		t.Errorf("Unexpected contents: %#v", c)
	}
	if len(d) != 2 {
		t.Errorf("Expected len=2: %d", len(d))
	}
	if !d.Has(ParseIPSloppy("4.0.0.0")) || !d.Has(ParseIPSloppy("5.0.0.0")) {
		t.Errorf("Unexpected contents: %#v", d)
	}
}

func TestIPSetList(t *testing.T) {
	// NOTE: IPv4-in-IPv6 addresses are represented as IPv4 in its string value
	s, err := ParseIPSet("3.0.0.0", "1.0.0.0", "2.0.0.0", "::ffff:1.2.3.4")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}

	l := s.StringSlice()
	sort.Strings(l)
	if !reflect.DeepEqual(l, []string{"1.0.0.0", "1.2.3.4", "2.0.0.0", "3.0.0.0"}) {
		t.Errorf("List gave unexpected result: %#v", l)
	}
}

func TestIPSetEqual(t *testing.T) {
	// IPv4-in-IPv6 addresses are equal to their IPv4 equivalents
	set1, err := ParseIPSet("1.0.0.0", "2.0.0.0", "3.0.0.0", "::ffff:4.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}

	set2, err := ParseIPSet("1.0.0.0", "2.0.0.0", "3.0.0.0", "4.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}

	if !set1.Equal(set2) {
		t.Errorf("sets %v and %v are not equal", set1, set2)
	}

	// order shouldn't matter
	set1, err = ParseIPSet("1.0.0.0", "2.0.0.0", "3.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}

	set2, err = ParseIPSet("3.0.0.0", "1.0.0.0", "2.0.0.0")
	if err != nil {
		t.Errorf("error parsing IPSet: %v", err)
	}

	if !set1.Equal(set2) {
		t.Errorf("sets %v and %v are not equal", set1, set2)
	}
}