/*
   Copyright The containerd 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 hostsstore

import (
	"net"
	"strings"
	"testing"

	types100 "github.com/containernetworking/cni/pkg/types/100"
	"gotest.tools/v3/assert"

	"github.com/containerd/nerdctl/v2/pkg/netutil"
)

func TestCreateLine(t *testing.T) {
	type testCase struct {
		thatIP         string
		thatNetwork    string
		thatHostname   string // nerdctl run --hostname
		thatDomainname string // nerdctl run --domainname
		thatName       string // nerdctl run --name
		myNetwork      string
		expected       string
	}
	testCases := []testCase{
		{
			thatIP:       "10.4.2.2",
			thatNetwork:  "n1",
			thatHostname: "bar",
			thatName:     "foo",
			myNetwork:    "n1",
			expected:     "bar bar.n1 foo foo.n1",
		},
		{
			thatIP:       "10.4.2.3",
			thatNetwork:  "n1",
			thatHostname: "bar",
			myNetwork:    "n1",
			expected:     "bar bar.n1",
		},
		{
			thatIP:       "10.4.2.4",
			thatNetwork:  netutil.DefaultNetworkName,
			thatHostname: "bar",
			myNetwork:    "n1",
			expected:     "",
		},
		{
			thatIP:      "10.4.2.5",
			thatNetwork: "n1",
			thatName:    "foo",
			myNetwork:   netutil.DefaultNetworkName,
			expected:    "",
		},
		{
			thatIP:      "10.4.2.6",
			thatNetwork: "n1",
			thatName:    "foo",
			myNetwork:   "n2",
			expected:    "",
		},
		{
			thatIP:       "10.4.2.3",
			thatNetwork:  "n1",
			thatHostname: "bar.example.com", // using a fqdn as hostname
			myNetwork:    "n1",
			expected:     "bar.example.com bar.example.com.n1",
		},
		{
			thatIP:         "10.4.2.7",
			thatNetwork:    "n1",
			thatHostname:   "bar", // unqualified hostname with separate domain name
			thatName:       "foo",
			thatDomainname: "example.com",
			myNetwork:      "n1",
			expected:       "bar.example.com bar bar.n1 foo foo.n1",
		},
		{
			thatIP:         "10.4.2.8",
			thatNetwork:    "n1",
			thatHostname:   "bar",
			thatDomainname: "example.com",
			myNetwork:      "n1",
			expected:       "bar.example.com bar bar.n1",
		},
		{
			thatIP:         "10.4.2.9",
			thatNetwork:    netutil.DefaultNetworkName,
			thatHostname:   "bar",
			thatDomainname: "example.com",
			myNetwork:      netutil.DefaultNetworkName,
			expected:       "bar.example.com bar",
		},
		{
			thatIP:         "10.4.2.9",
			thatNetwork:    netutil.DefaultNetworkName,
			thatHostname:   "bar.example.com",
			thatDomainname: "example.com",
			myNetwork:      netutil.DefaultNetworkName,
			expected:       "bar.example.com.example.com bar.example.com",
		},
	}
	for _, tc := range testCases {
		thatMeta := &Meta{
			ID: "984d63ce45ae",
			Networks: map[string]*types100.Result{
				tc.thatNetwork: {
					Interfaces: []*types100.Interface{
						{
							Name: "eth0",
						},
					},
					IPs: []*types100.IPConfig{
						{
							Address: net.IPNet{IP: net.ParseIP(tc.thatIP)},
						},
					},
				},
			},
			Hostname:   tc.thatHostname,
			Domainname: tc.thatDomainname,
			Name:       tc.thatName,
		}

		myNetworks := map[string]struct{}{
			tc.myNetwork: {},
		}
		lines := createLine(tc.thatNetwork, thatMeta, myNetworks)
		line := strings.Join(lines, " ")
		t.Logf("tc=%+v, line=%q", tc, line)
		assert.Equal(t, tc.expected, line)
	}
}