/*
   Copyright 2014 CoreOS, Inc.

   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 network

import (
	"errors"
	"net"
	"reflect"
	"testing"

	"github.com/coreos/coreos-cloudinit/datasource/metadata/digitalocean"
)

func TestParseNameservers(t *testing.T) {
	for _, tt := range []struct {
		dns digitalocean.DNS
		nss []net.IP
		err error
	}{
		{
			dns: digitalocean.DNS{},
			nss: []net.IP{},
		},
		{
			dns: digitalocean.DNS{[]string{"1.2.3.4"}},
			nss: []net.IP{net.ParseIP("1.2.3.4")},
		},
		{
			dns: digitalocean.DNS{[]string{"bad"}},
			err: errors.New("could not parse \"bad\" as nameserver IP address"),
		},
	} {
		nss, err := parseNameservers(tt.dns)
		if !errorsEqual(tt.err, err) {
			t.Fatalf("bad error (%+v): want %q, got %q", tt.dns, tt.err, err)
		}
		if !reflect.DeepEqual(tt.nss, nss) {
			t.Fatalf("bad nameservers (%+v): want %#v, got %#v", tt.dns, tt.nss, nss)
		}
	}
}

func TestParseInterface(t *testing.T) {
	for _, tt := range []struct {
		cfg      digitalocean.Interface
		nss      []net.IP
		useRoute bool
		iface    *logicalInterface
		err      error
	}{
		{
			cfg: digitalocean.Interface{
				MAC: "bad",
			},
			err: errors.New("invalid MAC address: bad"),
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
			},
			nss: []net.IP{},
			iface: &logicalInterface{
				hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
				config: configMethodStatic{
					addresses:   []net.IPNet{},
					nameservers: []net.IP{},
					routes:      []route{},
				},
			},
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
			},
			useRoute: true,
			nss:      []net.IP{net.ParseIP("1.2.3.4")},
			iface: &logicalInterface{
				hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
				config: configMethodStatic{
					addresses:   []net.IPNet{},
					nameservers: []net.IP{net.ParseIP("1.2.3.4")},
					routes:      []route{},
				},
			},
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv4: &digitalocean.Address{
					IPAddress: "bad",
					Netmask:   "255.255.0.0",
				},
			},
			nss: []net.IP{},
			err: errors.New("could not parse \"bad\" as IPv4 address"),
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv4: &digitalocean.Address{
					IPAddress: "1.2.3.4",
					Netmask:   "bad",
				},
			},
			nss: []net.IP{},
			err: errors.New("could not parse \"bad\" as IPv4 mask"),
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv4: &digitalocean.Address{
					IPAddress: "1.2.3.4",
					Netmask:   "255.255.0.0",
					Gateway:   "ignoreme",
				},
			},
			nss: []net.IP{},
			iface: &logicalInterface{
				hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
				config: configMethodStatic{
					addresses:   []net.IPNet{net.IPNet{net.ParseIP("1.2.3.4"), net.IPMask(net.ParseIP("255.255.0.0"))}},
					nameservers: []net.IP{},
					routes:      []route{},
				},
			},
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv4: &digitalocean.Address{
					IPAddress: "1.2.3.4",
					Netmask:   "255.255.0.0",
					Gateway:   "bad",
				},
			},
			useRoute: true,
			nss:      []net.IP{},
			err:      errors.New("could not parse \"bad\" as IPv4 gateway"),
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv4: &digitalocean.Address{
					IPAddress: "1.2.3.4",
					Netmask:   "255.255.0.0",
					Gateway:   "5.6.7.8",
				},
			},
			useRoute: true,
			nss:      []net.IP{},
			iface: &logicalInterface{
				hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
				config: configMethodStatic{
					addresses:   []net.IPNet{net.IPNet{net.ParseIP("1.2.3.4"), net.IPMask(net.ParseIP("255.255.0.0"))}},
					nameservers: []net.IP{},
					routes:      []route{route{net.IPNet{net.IPv4zero, net.IPMask(net.IPv4zero)}, net.ParseIP("5.6.7.8")}},
				},
			},
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv6: &digitalocean.Address{
					IPAddress: "bad",
					Cidr:      16,
				},
			},
			nss: []net.IP{},
			err: errors.New("could not parse \"bad\" as IPv6 address"),
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv6: &digitalocean.Address{
					IPAddress: "fe00::",
					Cidr:      16,
					Gateway:   "ignoreme",
				},
			},
			nss: []net.IP{},
			iface: &logicalInterface{
				hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
				config: configMethodStatic{
					addresses:   []net.IPNet{net.IPNet{net.ParseIP("fe00::"), net.IPMask(net.ParseIP("ffff::"))}},
					nameservers: []net.IP{},
					routes:      []route{},
				},
			},
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv6: &digitalocean.Address{
					IPAddress: "fe00::",
					Cidr:      16,
					Gateway:   "bad",
				},
			},
			useRoute: true,
			nss:      []net.IP{},
			err:      errors.New("could not parse \"bad\" as IPv6 gateway"),
		},
		{
			cfg: digitalocean.Interface{
				MAC: "01:23:45:67:89:AB",
				IPv6: &digitalocean.Address{
					IPAddress: "fe00::",
					Cidr:      16,
					Gateway:   "fe00:1234::",
				},
			},
			useRoute: true,
			nss:      []net.IP{},
			iface: &logicalInterface{
				hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
				config: configMethodStatic{
					addresses:   []net.IPNet{net.IPNet{net.ParseIP("fe00::"), net.IPMask(net.ParseIP("ffff::"))}},
					nameservers: []net.IP{},
					routes:      []route{route{net.IPNet{net.IPv6zero, net.IPMask(net.IPv6zero)}, net.ParseIP("fe00:1234::")}},
				},
			},
		},
	} {
		iface, err := parseInterface(tt.cfg, tt.nss, tt.useRoute)
		if !errorsEqual(tt.err, err) {
			t.Fatalf("bad error (%+v): want %q, got %q", tt.cfg, tt.err, err)
		}
		if !reflect.DeepEqual(tt.iface, iface) {
			t.Fatalf("bad interface (%+v): want %#v, got %#v", tt.cfg, tt.iface, iface)
		}
	}
}

func TestParseInterfaces(t *testing.T) {
	for _, tt := range []struct {
		cfg    digitalocean.Interfaces
		nss    []net.IP
		ifaces []InterfaceGenerator
		err    error
	}{
		{
			ifaces: []InterfaceGenerator{},
		},
		{
			cfg: digitalocean.Interfaces{
				Public: []digitalocean.Interface{{MAC: "01:23:45:67:89:AB"}},
			},
			ifaces: []InterfaceGenerator{
				&physicalInterface{logicalInterface{
					hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
					config: configMethodStatic{
						addresses:   []net.IPNet{},
						nameservers: []net.IP{},
						routes:      []route{},
					},
				}},
			},
		},
		{
			cfg: digitalocean.Interfaces{
				Private: []digitalocean.Interface{{MAC: "01:23:45:67:89:AB"}},
			},
			ifaces: []InterfaceGenerator{
				&physicalInterface{logicalInterface{
					hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
					config: configMethodStatic{
						addresses:   []net.IPNet{},
						nameservers: []net.IP{},
						routes:      []route{},
					},
				}},
			},
		},
		{
			cfg: digitalocean.Interfaces{
				Public: []digitalocean.Interface{{MAC: "01:23:45:67:89:AB"}},
			},
			nss: []net.IP{net.ParseIP("1.2.3.4")},
			ifaces: []InterfaceGenerator{
				&physicalInterface{logicalInterface{
					hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
					config: configMethodStatic{
						addresses:   []net.IPNet{},
						nameservers: []net.IP{net.ParseIP("1.2.3.4")},
						routes:      []route{},
					},
				}},
			},
		},
		{
			cfg: digitalocean.Interfaces{
				Private: []digitalocean.Interface{{MAC: "01:23:45:67:89:AB"}},
			},
			nss: []net.IP{net.ParseIP("1.2.3.4")},
			ifaces: []InterfaceGenerator{
				&physicalInterface{logicalInterface{
					hwaddr: net.HardwareAddr([]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab}),
					config: configMethodStatic{
						addresses:   []net.IPNet{},
						nameservers: []net.IP{},
						routes:      []route{},
					},
				}},
			},
		},
		{
			cfg: digitalocean.Interfaces{
				Public: []digitalocean.Interface{{MAC: "bad"}},
			},
			err: errors.New("invalid MAC address: bad"),
		},
		{
			cfg: digitalocean.Interfaces{
				Private: []digitalocean.Interface{{MAC: "bad"}},
			},
			err: errors.New("invalid MAC address: bad"),
		},
	} {
		ifaces, err := parseInterfaces(tt.cfg, tt.nss)
		if !errorsEqual(tt.err, err) {
			t.Fatalf("bad error (%+v): want %q, got %q", tt.cfg, tt.err, err)
		}
		if !reflect.DeepEqual(tt.ifaces, ifaces) {
			t.Fatalf("bad interfaces (%+v): want %#v, got %#v", tt.cfg, tt.ifaces, ifaces)
		}
	}
}

func TestProcessDigitalOceanNetconf(t *testing.T) {
	for _, tt := range []struct {
		cfg    string
		ifaces []InterfaceGenerator
		err    error
	}{
		{
			cfg: ``,
		},
		{
			cfg: `{"dns":{"nameservers":["bad"]}}`,
			err: errors.New("could not parse \"bad\" as nameserver IP address"),
		},
		{
			cfg: `{"interfaces":{"public":[{"ipv4":{"ip_address":"bad"}}]}}`,
			err: errors.New("could not parse \"bad\" as IPv4 address"),
		},
		{
			cfg:    `{}`,
			ifaces: []InterfaceGenerator{},
		},
	} {
		ifaces, err := ProcessDigitalOceanNetconf(tt.cfg)
		if !errorsEqual(tt.err, err) {
			t.Fatalf("bad error (%q): want %q, got %q", tt.cfg, tt.err, err)
		}
		if !reflect.DeepEqual(tt.ifaces, ifaces) {
			t.Fatalf("bad interfaces (%q): want %#v, got %#v", tt.cfg, tt.ifaces, ifaces)
		}
	}
}

func errorsEqual(a, b error) bool {
	if a == nil && b == nil {
		return true
	}
	if (a != nil && b == nil) || (a == nil && b != nil) {
		return false
	}
	return (a.Error() == b.Error())
}