package home

import (
	"net"
	"os"
	"testing"
	"time"

	"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"

	"github.com/stretchr/testify/assert"
)

func TestClients(t *testing.T) {
	clients := clientsContainer{}
	clients.testing = true

	clients.Init(nil, nil, nil)

	t.Run("add_success", func(t *testing.T) {
		c := Client{
			IDs:  []string{"1.1.1.1", "1:2:3::4", "aa:aa:aa:aa:aa:aa"},
			Name: "client1",
		}

		b, err := clients.Add(c)
		assert.True(t, b)
		assert.Nil(t, err)

		c = Client{
			IDs:  []string{"2.2.2.2"},
			Name: "client2",
		}

		b, err = clients.Add(c)
		assert.True(t, b)
		assert.Nil(t, err)

		c, b = clients.Find(net.IPv4(1, 1, 1, 1))
		assert.True(t, b)
		assert.Equal(t, c.Name, "client1")

		c, b = clients.Find(net.ParseIP("1:2:3::4"))
		assert.True(t, b)
		assert.Equal(t, c.Name, "client1")

		c, b = clients.Find(net.IPv4(2, 2, 2, 2))
		assert.True(t, b)
		assert.Equal(t, c.Name, "client2")

		assert.False(t, clients.Exists(net.IPv4(1, 2, 3, 4), ClientSourceHostsFile))
		assert.True(t, clients.Exists(net.IPv4(1, 1, 1, 1), ClientSourceHostsFile))
		assert.True(t, clients.Exists(net.IPv4(2, 2, 2, 2), ClientSourceHostsFile))
	})

	t.Run("add_fail_name", func(t *testing.T) {
		c := Client{
			IDs:  []string{"1.2.3.5"},
			Name: "client1",
		}

		b, err := clients.Add(c)
		assert.False(t, b)
		assert.Nil(t, err)
	})

	t.Run("add_fail_ip", func(t *testing.T) {
		c := Client{
			IDs:  []string{"2.2.2.2"},
			Name: "client3",
		}

		b, err := clients.Add(c)
		assert.False(t, b)
		assert.NotNil(t, err)
	})

	t.Run("update_fail_name", func(t *testing.T) {
		c := Client{
			IDs:  []string{"1.2.3.0"},
			Name: "client3",
		}

		err := clients.Update("client3", c)
		assert.NotNil(t, err)

		c = Client{
			IDs:  []string{"1.2.3.0"},
			Name: "client2",
		}

		err = clients.Update("client3", c)
		assert.NotNil(t, err)
	})

	t.Run("update_fail_ip", func(t *testing.T) {
		c := Client{
			IDs:  []string{"2.2.2.2"},
			Name: "client1",
		}

		err := clients.Update("client1", c)
		assert.NotNil(t, err)
	})

	t.Run("update_success", func(t *testing.T) {
		c := Client{
			IDs:  []string{"1.1.1.2"},
			Name: "client1",
		}

		err := clients.Update("client1", c)
		assert.Nil(t, err)

		assert.False(t, clients.Exists(net.IPv4(1, 1, 1, 1), ClientSourceHostsFile))
		assert.True(t, clients.Exists(net.IPv4(1, 1, 1, 2), ClientSourceHostsFile))

		c = Client{
			IDs:            []string{"1.1.1.2"},
			Name:           "client1-renamed",
			UseOwnSettings: true,
		}

		err = clients.Update("client1", c)
		assert.Nil(t, err)

		c, b := clients.Find(net.IPv4(1, 1, 1, 2))
		assert.True(t, b)
		assert.Equal(t, "client1-renamed", c.Name)
		assert.Equal(t, "1.1.1.2", c.IDs[0])
		assert.True(t, c.UseOwnSettings)
		assert.Nil(t, clients.list["client1"])
	})

	t.Run("del_success", func(t *testing.T) {
		b := clients.Del("client1-renamed")
		assert.True(t, b)
		assert.False(t, clients.Exists(net.IPv4(1, 1, 1, 2), ClientSourceHostsFile))
	})

	t.Run("del_fail", func(t *testing.T) {
		b := clients.Del("client3")
		assert.False(t, b)
	})

	t.Run("addhost_success", func(t *testing.T) {
		b, err := clients.AddHost("1.1.1.1", "host", ClientSourceARP)
		assert.True(t, b)
		assert.Nil(t, err)

		b, err = clients.AddHost("1.1.1.1", "host2", ClientSourceARP)
		assert.True(t, b)
		assert.Nil(t, err)

		b, err = clients.AddHost("1.1.1.1", "host3", ClientSourceHostsFile)
		assert.True(t, b)
		assert.Nil(t, err)

		assert.True(t, clients.Exists(net.IPv4(1, 1, 1, 1), ClientSourceHostsFile))
	})

	t.Run("addhost_fail", func(t *testing.T) {
		b, err := clients.AddHost("1.1.1.1", "host1", ClientSourceRDNS)
		assert.False(t, b)
		assert.Nil(t, err)
	})
}

func TestClientsWhois(t *testing.T) {
	var c Client
	clients := clientsContainer{}
	clients.testing = true
	clients.Init(nil, nil, nil)

	whois := [][]string{{"orgname", "orgname-val"}, {"country", "country-val"}}
	// set whois info on new client
	clients.SetWhoisInfo(net.IPv4(1, 1, 1, 255), whois)
	assert.Equal(t, "orgname-val", clients.ipHost["1.1.1.255"].WhoisInfo[0][1])

	// set whois info on existing auto-client
	_, _ = clients.AddHost("1.1.1.1", "host", ClientSourceRDNS)
	clients.SetWhoisInfo(net.IPv4(1, 1, 1, 1), whois)
	assert.Equal(t, "orgname-val", clients.ipHost["1.1.1.1"].WhoisInfo[0][1])

	// Check that we cannot set whois info on a manually-added client
	c = Client{
		IDs:  []string{"1.1.1.2"},
		Name: "client1",
	}
	_, _ = clients.Add(c)
	clients.SetWhoisInfo(net.IPv4(1, 1, 1, 2), whois)
	assert.Nil(t, clients.ipHost["1.1.1.2"])
	_ = clients.Del("client1")
}

func TestClientsAddExisting(t *testing.T) {
	var c Client
	clients := clientsContainer{}
	clients.testing = true
	clients.Init(nil, nil, nil)

	// some test variables
	mac, _ := net.ParseMAC("aa:aa:aa:aa:aa:aa")
	testIP := "1.2.3.4"

	// add a client
	c = Client{
		IDs:  []string{"1.1.1.1", "1:2:3::4", "aa:aa:aa:aa:aa:aa", "2.2.2.0/24"},
		Name: "client1",
	}
	ok, err := clients.Add(c)
	assert.True(t, ok)
	assert.Nil(t, err)

	// add an auto-client with the same IP - it's allowed
	ok, err = clients.AddHost("1.1.1.1", "test", ClientSourceRDNS)
	assert.True(t, ok)
	assert.Nil(t, err)

	// now some more complicated stuff
	// first, init a DHCP server with a single static lease
	config := dhcpd.ServerConfig{
		DBFilePath: "leases.db",
	}
	defer func() { _ = os.Remove("leases.db") }()
	clients.dhcpServer = dhcpd.Create(config)
	err = clients.dhcpServer.AddStaticLease(dhcpd.Lease{
		HWAddr:   mac,
		IP:       net.ParseIP(testIP).To4(),
		Hostname: "testhost",
		Expiry:   time.Now().Add(time.Hour),
	})
	assert.Nil(t, err)

	// add a new client with the same IP as for a client with MAC
	c = Client{
		IDs:  []string{testIP},
		Name: "client2",
	}
	ok, err = clients.Add(c)
	assert.True(t, ok)
	assert.Nil(t, err)

	// add a new client with the IP from the client1's IP range
	c = Client{
		IDs:  []string{"2.2.2.2"},
		Name: "client3",
	}
	ok, err = clients.Add(c)
	assert.True(t, ok)
	assert.Nil(t, err)
}

func TestClientsCustomUpstream(t *testing.T) {
	clients := clientsContainer{}
	clients.testing = true

	clients.Init(nil, nil, nil)

	// add client with upstreams
	client := Client{
		IDs:  []string{"1.1.1.1", "1:2:3::4", "aa:aa:aa:aa:aa:aa"},
		Name: "client1",
		Upstreams: []string{
			"1.1.1.1",
			"[/example.org/]8.8.8.8",
		},
	}
	ok, err := clients.Add(client)
	assert.Nil(t, err)
	assert.True(t, ok)

	config := clients.FindUpstreams("1.2.3.4")
	assert.Nil(t, config)

	config = clients.FindUpstreams("1.1.1.1")
	assert.NotNil(t, config)
	assert.Len(t, config.Upstreams, 1)
	assert.Len(t, config.DomainReservedUpstreams, 1)
}