package mapper

import (
	"fmt"
	"net/netip"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
	"github.com/juanfont/headscale/hscontrol/policy"
	"github.com/juanfont/headscale/hscontrol/types"
	"gopkg.in/check.v1"
	"tailscale.com/tailcfg"
	"tailscale.com/types/dnstype"
	"tailscale.com/types/key"
)

func (s *Suite) TestGetMapResponseUserProfiles(c *check.C) {
	mach := func(hostname, username string, userid uint) types.Machine {
		return types.Machine{
			Hostname: hostname,
			UserID:   userid,
			User: types.User{
				Name: username,
			},
		}
	}

	machineInShared1 := mach("test_get_shared_nodes_1", "user1", 1)
	machineInShared2 := mach("test_get_shared_nodes_2", "user2", 2)
	machineInShared3 := mach("test_get_shared_nodes_3", "user3", 3)
	machine2InShared1 := mach("test_get_shared_nodes_4", "user1", 1)

	userProfiles := generateUserProfiles(
		&machineInShared1,
		types.Machines{
			machineInShared2, machineInShared3, machine2InShared1,
		},
		"",
	)

	c.Assert(len(userProfiles), check.Equals, 3)

	users := []string{
		"user1", "user2", "user3",
	}

	for _, user := range users {
		found := false
		for _, userProfile := range userProfiles {
			if userProfile.DisplayName == user {
				found = true

				break
			}
		}
		c.Assert(found, check.Equals, true)
	}
}

func TestDNSConfigMapResponse(t *testing.T) {
	tests := []struct {
		magicDNS bool
		want     *tailcfg.DNSConfig
	}{
		{
			magicDNS: true,
			want: &tailcfg.DNSConfig{
				Routes: map[string][]*dnstype.Resolver{
					"shared1.foobar.headscale.net": {},
					"shared2.foobar.headscale.net": {},
					"shared3.foobar.headscale.net": {},
				},
				Domains: []string{
					"foobar.headscale.net",
					"shared1.foobar.headscale.net",
				},
				Proxied: true,
			},
		},
		{
			magicDNS: false,
			want: &tailcfg.DNSConfig{
				Domains: []string{"foobar.headscale.net"},
				Proxied: false,
			},
		},
	}

	for _, tt := range tests {
		t.Run(fmt.Sprintf("with-magicdns-%v", tt.magicDNS), func(t *testing.T) {
			mach := func(hostname, username string, userid uint) types.Machine {
				return types.Machine{
					Hostname: hostname,
					UserID:   userid,
					User: types.User{
						Name: username,
					},
				}
			}

			baseDomain := "foobar.headscale.net"

			dnsConfigOrig := tailcfg.DNSConfig{
				Routes:  make(map[string][]*dnstype.Resolver),
				Domains: []string{baseDomain},
				Proxied: tt.magicDNS,
			}

			machineInShared1 := mach("test_get_shared_nodes_1", "shared1", 1)
			machineInShared2 := mach("test_get_shared_nodes_2", "shared2", 2)
			machineInShared3 := mach("test_get_shared_nodes_3", "shared3", 3)
			machine2InShared1 := mach("test_get_shared_nodes_4", "shared1", 1)

			peersOfMachineInShared1 := types.Machines{
				machineInShared1,
				machineInShared2,
				machineInShared3,
				machine2InShared1,
			}

			got := generateDNSConfig(
				&dnsConfigOrig,
				baseDomain,
				machineInShared1,
				peersOfMachineInShared1,
			)

			if diff := cmp.Diff(tt.want, got, cmpopts.EquateEmpty()); diff != "" {
				t.Errorf("expandAlias() unexpected result (-want +got):\n%s", diff)
			}
		})
	}
}

func Test_fullMapResponse(t *testing.T) {
	mustNK := func(str string) key.NodePublic {
		var k key.NodePublic
		_ = k.UnmarshalText([]byte(str))

		return k
	}

	mustDK := func(str string) key.DiscoPublic {
		var k key.DiscoPublic
		_ = k.UnmarshalText([]byte(str))

		return k
	}

	mustMK := func(str string) key.MachinePublic {
		var k key.MachinePublic
		_ = k.UnmarshalText([]byte(str))

		return k
	}

	hiview := func(hoin tailcfg.Hostinfo) tailcfg.HostinfoView {
		return hoin.View()
	}

	created := time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)
	lastSeen := time.Date(2009, time.November, 10, 23, 9, 0, 0, time.UTC)
	expire := time.Date(2500, time.November, 11, 23, 0, 0, 0, time.UTC)

	tests := []struct {
		name    string
		pol     *policy.ACLPolicy
		machine *types.Machine
		peers   types.Machines

		stripEmailDomain bool
		baseDomain       string
		dnsConfig        *tailcfg.DNSConfig
		derpMap          *tailcfg.DERPMap
		logtail          bool
		randomClientPort bool
		want             *tailcfg.MapResponse
		wantErr          bool
	}{
		// {
		// 	name:             "empty-machine",
		// 	machine:          types.Machine{},
		// 	pol:              &policy.ACLPolicy{},
		// 	dnsConfig:        &tailcfg.DNSConfig{},
		// 	baseDomain:       "",
		// 	stripEmailDomain: false,
		// 	want:             nil,
		// 	wantErr:          true,
		// },
		{
			name: "no-pol-no-peers-map-response",
			pol:  &policy.ACLPolicy{},
			machine: &types.Machine{
				ID:          0,
				MachineKey:  "mkey:f08305b4ee4250b95a70f3b7504d048d75d899993c624a26d422c67af0422507",
				NodeKey:     "nodekey:9b2ffa7e08cc421a3d2cca9012280f6a236fd0de0b4ce005b30a98ad930306fe",
				DiscoKey:    "discokey:cf7b0fd05da556fdc3bab365787b506fd82d64a70745db70e00e86c1b1c03084",
				IPAddresses: []netip.Addr{netip.MustParseAddr("100.64.0.1")},
				Hostname:    "mini",
				GivenName:   "mini",
				UserID:      0,
				User:        types.User{Name: "mini"},
				ForcedTags:  []string{},
				AuthKeyID:   0,
				AuthKey:     &types.PreAuthKey{},
				LastSeen:    &lastSeen,
				Expiry:      &expire,
				HostInfo:    types.HostInfo{},
				Endpoints:   []string{},
				Routes: []types.Route{
					{
						Prefix:     types.IPPrefix(netip.MustParsePrefix("0.0.0.0/0")),
						Advertised: true,
						Enabled:    true,
						IsPrimary:  false,
					},
					{
						Prefix:     types.IPPrefix(netip.MustParsePrefix("192.168.0.0/24")),
						Advertised: true,
						Enabled:    true,
						IsPrimary:  true,
					},
					{
						Prefix:     types.IPPrefix(netip.MustParsePrefix("172.0.0.0/10")),
						Advertised: true,
						Enabled:    false,
						IsPrimary:  true,
					},
				},
				CreatedAt: created,
			},
			peers:            []types.Machine{},
			stripEmailDomain: false,
			baseDomain:       "",
			dnsConfig:        &tailcfg.DNSConfig{},
			derpMap:          &tailcfg.DERPMap{},
			logtail:          false,
			randomClientPort: false,
			want: &tailcfg.MapResponse{
				KeepAlive: false,
				Node: &tailcfg.Node{
					ID:       0,
					StableID: "0",
					Name:     "mini",
					User:     0,
					Key: mustNK(
						"nodekey:9b2ffa7e08cc421a3d2cca9012280f6a236fd0de0b4ce005b30a98ad930306fe",
					),
					KeyExpiry: expire,
					Machine: mustMK(
						"mkey:f08305b4ee4250b95a70f3b7504d048d75d899993c624a26d422c67af0422507",
					),
					DiscoKey: mustDK(
						"discokey:cf7b0fd05da556fdc3bab365787b506fd82d64a70745db70e00e86c1b1c03084",
					),
					Addresses: []netip.Prefix{netip.MustParsePrefix("100.64.0.1/32")},
					AllowedIPs: []netip.Prefix{
						netip.MustParsePrefix("100.64.0.1/32"),
						netip.MustParsePrefix("0.0.0.0/0"),
						netip.MustParsePrefix("192.168.0.0/24"),
					},
					Endpoints:         []string{},
					DERP:              "127.3.3.40:0",
					Hostinfo:          hiview(tailcfg.Hostinfo{}),
					Created:           created,
					Tags:              []string{},
					PrimaryRoutes:     []netip.Prefix{netip.MustParsePrefix("192.168.0.0/24")},
					LastSeen:          &lastSeen,
					Online:            new(bool),
					KeepAlive:         true,
					MachineAuthorized: true,
					Capabilities: []string{
						tailcfg.CapabilityFileSharing,
						tailcfg.CapabilityAdmin,
						tailcfg.CapabilitySSH,
					},
				},
				DERPMap:         &tailcfg.DERPMap{},
				Peers:           []*tailcfg.Node{},
				DNSConfig:       &tailcfg.DNSConfig{},
				Domain:          "",
				CollectServices: "false",
				PacketFilter:    []tailcfg.FilterRule{},
				UserProfiles:    []tailcfg.UserProfile{{LoginName: "mini", DisplayName: "mini"}},
				SSHPolicy:       nil,
				ControlTime:     &time.Time{},
				Debug: &tailcfg.Debug{
					DisableLogTail: true,
				},
			},
			wantErr: false,
		},
		{
			name: "no-pol-map-response",
			pol:  &policy.ACLPolicy{},
			machine: &types.Machine{
				ID:          0,
				MachineKey:  "mkey:f08305b4ee4250b95a70f3b7504d048d75d899993c624a26d422c67af0422507",
				NodeKey:     "nodekey:9b2ffa7e08cc421a3d2cca9012280f6a236fd0de0b4ce005b30a98ad930306fe",
				DiscoKey:    "discokey:cf7b0fd05da556fdc3bab365787b506fd82d64a70745db70e00e86c1b1c03084",
				IPAddresses: []netip.Addr{netip.MustParseAddr("100.64.0.1")},
				Hostname:    "mini",
				GivenName:   "mini",
				UserID:      0,
				User:        types.User{Name: "mini"},
				ForcedTags:  []string{},
				LastSeen:    &lastSeen,
				Expiry:      &expire,
				HostInfo:    types.HostInfo{},
				Endpoints:   []string{},
				Routes: []types.Route{
					{
						Prefix:     types.IPPrefix(netip.MustParsePrefix("0.0.0.0/0")),
						Advertised: true,
						Enabled:    true,
						IsPrimary:  false,
					},
					{
						Prefix:     types.IPPrefix(netip.MustParsePrefix("192.168.0.0/24")),
						Advertised: true,
						Enabled:    true,
						IsPrimary:  true,
					},
					{
						Prefix:     types.IPPrefix(netip.MustParsePrefix("172.0.0.0/10")),
						Advertised: true,
						Enabled:    false,
						IsPrimary:  true,
					},
				},
				CreatedAt: created,
			},
			peers: []types.Machine{
				{
					ID:          1,
					MachineKey:  "mkey:f08305b4ee4250b95a70f3b7504d048d75d899993c624a26d422c67af0422507",
					NodeKey:     "nodekey:9b2ffa7e08cc421a3d2cca9012280f6a236fd0de0b4ce005b30a98ad930306fe",
					DiscoKey:    "discokey:cf7b0fd05da556fdc3bab365787b506fd82d64a70745db70e00e86c1b1c03084",
					IPAddresses: []netip.Addr{netip.MustParseAddr("100.64.0.2")},
					Hostname:    "peer1",
					GivenName:   "peer1",
					UserID:      0,
					User:        types.User{Name: "mini"},
					ForcedTags:  []string{},
					LastSeen:    &lastSeen,
					Expiry:      &expire,
					HostInfo:    types.HostInfo{},
					Endpoints:   []string{},
					Routes:      []types.Route{},
					CreatedAt:   created,
				},
			},
			stripEmailDomain: false,
			baseDomain:       "",
			dnsConfig:        &tailcfg.DNSConfig{},
			derpMap:          &tailcfg.DERPMap{},
			logtail:          false,
			randomClientPort: false,
			want: &tailcfg.MapResponse{
				KeepAlive: false,
				Node: &tailcfg.Node{
					ID:       0,
					StableID: "0",
					Name:     "mini",
					User:     0,
					Key: mustNK(
						"nodekey:9b2ffa7e08cc421a3d2cca9012280f6a236fd0de0b4ce005b30a98ad930306fe",
					),
					KeyExpiry: expire,
					Machine: mustMK(
						"mkey:f08305b4ee4250b95a70f3b7504d048d75d899993c624a26d422c67af0422507",
					),
					DiscoKey: mustDK(
						"discokey:cf7b0fd05da556fdc3bab365787b506fd82d64a70745db70e00e86c1b1c03084",
					),
					Addresses: []netip.Prefix{netip.MustParsePrefix("100.64.0.1/32")},
					AllowedIPs: []netip.Prefix{
						netip.MustParsePrefix("100.64.0.1/32"),
						netip.MustParsePrefix("0.0.0.0/0"),
						netip.MustParsePrefix("192.168.0.0/24"),
					},
					Endpoints:         []string{},
					DERP:              "127.3.3.40:0",
					Hostinfo:          hiview(tailcfg.Hostinfo{}),
					Created:           created,
					Tags:              []string{},
					PrimaryRoutes:     []netip.Prefix{netip.MustParsePrefix("192.168.0.0/24")},
					LastSeen:          &lastSeen,
					Online:            new(bool),
					KeepAlive:         true,
					MachineAuthorized: true,
					Capabilities: []string{
						tailcfg.CapabilityFileSharing,
						tailcfg.CapabilityAdmin,
						tailcfg.CapabilitySSH,
					},
				},
				DERPMap: &tailcfg.DERPMap{},
				Peers: []*tailcfg.Node{
					{
						ID:       1,
						StableID: "1",
						Name:     "peer1",
						Key: mustNK(
							"nodekey:9b2ffa7e08cc421a3d2cca9012280f6a236fd0de0b4ce005b30a98ad930306fe",
						),
						KeyExpiry: expire,
						Machine: mustMK(
							"mkey:f08305b4ee4250b95a70f3b7504d048d75d899993c624a26d422c67af0422507",
						),
						DiscoKey: mustDK(
							"discokey:cf7b0fd05da556fdc3bab365787b506fd82d64a70745db70e00e86c1b1c03084",
						),
						Addresses:         []netip.Prefix{netip.MustParsePrefix("100.64.0.2/32")},
						AllowedIPs:        []netip.Prefix{netip.MustParsePrefix("100.64.0.2/32")},
						Endpoints:         []string{},
						DERP:              "127.3.3.40:0",
						Hostinfo:          hiview(tailcfg.Hostinfo{}),
						Created:           created,
						Tags:              []string{},
						PrimaryRoutes:     []netip.Prefix{},
						LastSeen:          &lastSeen,
						Online:            new(bool),
						KeepAlive:         true,
						MachineAuthorized: true,
						Capabilities: []string{
							tailcfg.CapabilityFileSharing,
							tailcfg.CapabilityAdmin,
							tailcfg.CapabilitySSH,
						},
					},
				},
				DNSConfig:       &tailcfg.DNSConfig{},
				Domain:          "",
				CollectServices: "false",
				PacketFilter:    []tailcfg.FilterRule{},
				UserProfiles:    []tailcfg.UserProfile{{LoginName: "mini", DisplayName: "mini"}},
				SSHPolicy:       nil,
				ControlTime:     &time.Time{},
				Debug: &tailcfg.Debug{
					DisableLogTail: true,
				},
			},
			wantErr: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := fullMapResponse(
				tt.pol,
				tt.machine,
				tt.peers,
				tt.stripEmailDomain,
				tt.baseDomain,
				tt.dnsConfig,
				tt.derpMap,
				tt.logtail,
				tt.randomClientPort,
			)

			if (err != nil) != tt.wantErr {
				t.Errorf("fullMapResponse() error = %v, wantErr %v", err, tt.wantErr)

				return
			}

			if diff := cmp.Diff(
				tt.want,
				got,
				cmpopts.EquateEmpty(),
				// Ignore ControlTime, it is set to now and we dont really need to mock it.
				cmpopts.IgnoreFields(tailcfg.MapResponse{}, "ControlTime"),
			); diff != "" {
				t.Errorf("fullMapResponse() unexpected result (-want +got):\n%s", diff)
			}
		})
	}
}