//go:build linux

package aghnet

import (
	"io/fs"
	"testing"
	"testing/fstest"

	"github.com/AdguardTeam/golibs/testutil"
	"github.com/stretchr/testify/assert"
)

func TestHasStaticIP(t *testing.T) {
	const ifaceName = "wlan0"

	const (
		dhcpcd    = "etc/dhcpcd.conf"
		netifaces = "etc/network/interfaces"
	)

	testCases := []struct {
		rootFsys   fs.FS
		name       string
		wantHas    assert.BoolAssertionFunc
		wantErrMsg string
	}{{
		rootFsys: fstest.MapFS{
			dhcpcd: &fstest.MapFile{
				Data: []byte(
					`#comment` + nl +
						`# comment` + nl +
						`interface eth0` + nl +
						`static ip_address=192.168.0.1/24` + nl +
						`# interface ` + ifaceName + nl +
						`static ip_address=192.168.1.1/24` + nl +
						`# comment` + nl,
				),
			},
		},
		name:       "dhcpcd_has_not",
		wantHas:    assert.False,
		wantErrMsg: `no information about static ip`,
	}, {
		rootFsys: fstest.MapFS{
			dhcpcd: &fstest.MapFile{
				Data: []byte(
					`#comment` + nl +
						`# comment` + nl +
						`interface ` + ifaceName + nl +
						`static ip_address=192.168.0.1/24` + nl +
						`# interface ` + ifaceName + nl +
						`static ip_address=192.168.1.1/24` + nl +
						`# comment` + nl,
				),
			},
		},
		name:       "dhcpcd_has",
		wantHas:    assert.True,
		wantErrMsg: ``,
	}, {
		rootFsys: fstest.MapFS{
			netifaces: &fstest.MapFile{
				Data: []byte(
					`allow-hotplug ` + ifaceName + nl +
						`#iface enp0s3 inet static` + nl +
						`#  address 192.168.0.200` + nl +
						`#  netmask 255.255.255.0` + nl +
						`#  gateway 192.168.0.1` + nl +
						`iface ` + ifaceName + ` inet dhcp` + nl,
				),
			},
		},
		name:       "netifaces_has_not",
		wantHas:    assert.False,
		wantErrMsg: `no information about static ip`,
	}, {
		rootFsys: fstest.MapFS{
			netifaces: &fstest.MapFile{
				Data: []byte(
					`allow-hotplug ` + ifaceName + nl +
						`iface ` + ifaceName + ` inet static` + nl +
						`  address 192.168.0.200` + nl +
						`  netmask 255.255.255.0` + nl +
						`  gateway 192.168.0.1` + nl +
						`#iface ` + ifaceName + ` inet dhcp` + nl,
				),
			},
		},
		name:       "netifaces_has",
		wantHas:    assert.True,
		wantErrMsg: ``,
	}, {
		rootFsys: fstest.MapFS{
			netifaces: &fstest.MapFile{
				Data: []byte(
					`source hello` + nl +
						`#iface ` + ifaceName + ` inet static` + nl,
				),
			},
			"hello": &fstest.MapFile{
				Data: []byte(`iface ` + ifaceName + ` inet static` + nl),
			},
		},
		name:       "netifaces_another_file",
		wantHas:    assert.True,
		wantErrMsg: ``,
	}, {
		rootFsys: fstest.MapFS{
			netifaces: &fstest.MapFile{
				Data: []byte(
					`source hello` + nl +
						`iface ` + ifaceName + ` inet static` + nl,
				),
			},
		},
		name:       "netifaces_ignore_another",
		wantHas:    assert.True,
		wantErrMsg: ``,
	}}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			substRootDirFS(t, tc.rootFsys)

			ctx := testutil.ContextWithTimeout(t, testTimeout)
			has, err := IfaceHasStaticIP(ctx, testCmdCons, ifaceName)
			testutil.AssertErrorMsg(t, tc.wantErrMsg, err)

			tc.wantHas(t, has)
		})
	}
}
