package server

import (
	"context"
	"errors"
	"fmt"
	"testing"
	"time"

	nbdns "github.com/netbirdio/netbird/dns"
	nbgroup "github.com/netbirdio/netbird/management/server/group"
	"github.com/netbirdio/netbird/management/server/status"
	"github.com/netbirdio/netbird/route"
	"github.com/stretchr/testify/assert"
)

const (
	groupAdminUserID = "testingAdminUser"
)

func TestDefaultAccountManager_CreateGroup(t *testing.T) {
	am, err := createManager(t)
	if err != nil {
		t.Error("failed to create account manager")
	}

	_, account, err := initTestGroupAccount(am)
	if err != nil {
		t.Error("failed to init testing account")
	}
	for _, group := range account.Groups {
		group.Issued = nbgroup.GroupIssuedIntegration
		err = am.SaveGroup(context.Background(), account.Id, groupAdminUserID, group)
		if err != nil {
			t.Errorf("should allow to create %s groups", nbgroup.GroupIssuedIntegration)
		}
	}

	for _, group := range account.Groups {
		group.Issued = nbgroup.GroupIssuedJWT
		err = am.SaveGroup(context.Background(), account.Id, groupAdminUserID, group)
		if err != nil {
			t.Errorf("should allow to create %s groups", nbgroup.GroupIssuedJWT)
		}
	}
	for _, group := range account.Groups {
		group.Issued = nbgroup.GroupIssuedAPI
		group.ID = ""
		err = am.SaveGroup(context.Background(), account.Id, groupAdminUserID, group)
		if err == nil {
			t.Errorf("should not create api group with the same name, %s", group.Name)
		}
	}
}

func TestDefaultAccountManager_DeleteGroup(t *testing.T) {
	am, err := createManager(t)
	if err != nil {
		t.Error("failed to create account manager")
	}

	_, account, err := initTestGroupAccount(am)
	if err != nil {
		t.Error("failed to init testing account")
	}

	testCases := []struct {
		name           string
		groupID        string
		expectedReason string
	}{
		{
			"route",
			"grp-for-route",
			"route",
		},
		{
			"route with peer groups",
			"grp-for-route2",
			"route",
		},
		{
			"name server groups",
			"grp-for-name-server-grp",
			"name server groups",
		},
		{
			"policy",
			"grp-for-policies",
			"policy",
		},
		{
			"setup keys",
			"grp-for-keys",
			"setup key",
		},
		{
			"users",
			"grp-for-users",
			"user",
		},
		{
			"integration",
			"grp-for-integration",
			"only service users with admin power can delete integration group",
		},
	}

	for _, testCase := range testCases {
		t.Run(testCase.name, func(t *testing.T) {
			err = am.DeleteGroup(context.Background(), account.Id, groupAdminUserID, testCase.groupID)
			if err == nil {
				t.Errorf("delete %s group successfully", testCase.groupID)
				return
			}

			var sErr *status.Error
			if errors.As(err, &sErr) {
				if sErr.Message != testCase.expectedReason {
					t.Errorf("invalid error case: %s, expected: %s", sErr.Message, testCase.expectedReason)
				}
				return
			}

			var gErr *GroupLinkError
			ok := errors.As(err, &gErr)
			if !ok {
				t.Error("invalid error type")
				return
			}
			if gErr.Resource != testCase.expectedReason {
				t.Errorf("invalid error case: %s, expected: %s", gErr.Resource, testCase.expectedReason)
			}
		})
	}
}

func TestDefaultAccountManager_DeleteGroups(t *testing.T) {
	am, err := createManager(t)
	assert.NoError(t, err, "Failed to create account manager")

	manager, account, err := initTestGroupAccount(am)
	assert.NoError(t, err, "Failed to init testing account")

	groups := make([]*nbgroup.Group, 10)
	for i := 0; i < 10; i++ {
		groups[i] = &nbgroup.Group{
			ID:        fmt.Sprintf("group-%d", i+1),
			AccountID: account.Id,
			Name:      fmt.Sprintf("group-%d", i+1),
			Issued:    nbgroup.GroupIssuedAPI,
		}
	}

	err = manager.SaveGroups(context.Background(), account.Id, groupAdminUserID, groups)
	assert.NoError(t, err, "Failed to save test groups")

	testCases := []struct {
		name               string
		groupIDs           []string
		expectedReasons    []string
		expectedDeleted    []string
		expectedNotDeleted []string
	}{
		{
			name:            "route",
			groupIDs:        []string{"grp-for-route"},
			expectedReasons: []string{"route"},
		},
		{
			name:            "route with peer groups",
			groupIDs:        []string{"grp-for-route2"},
			expectedReasons: []string{"route"},
		},
		{
			name:            "name server groups",
			groupIDs:        []string{"grp-for-name-server-grp"},
			expectedReasons: []string{"name server groups"},
		},
		{
			name:            "policy",
			groupIDs:        []string{"grp-for-policies"},
			expectedReasons: []string{"policy"},
		},
		{
			name:            "setup keys",
			groupIDs:        []string{"grp-for-keys"},
			expectedReasons: []string{"setup key"},
		},
		{
			name:            "users",
			groupIDs:        []string{"grp-for-users"},
			expectedReasons: []string{"user"},
		},
		{
			name:            "integration",
			groupIDs:        []string{"grp-for-integration"},
			expectedReasons: []string{"only service users with admin power can delete integration group"},
		},
		{
			name:            "successfully delete multiple groups",
			groupIDs:        []string{"group-1", "group-2"},
			expectedDeleted: []string{"group-1", "group-2"},
		},
		{
			name:            "delete non-existent group",
			groupIDs:        []string{"non-existent-group"},
			expectedDeleted: []string{"non-existent-group"},
		},
		{
			name:               "delete multiple groups with mixed results",
			groupIDs:           []string{"group-3", "grp-for-policies", "group-4", "grp-for-users"},
			expectedReasons:    []string{"policy", "user"},
			expectedDeleted:    []string{"group-3", "group-4"},
			expectedNotDeleted: []string{"grp-for-policies", "grp-for-users"},
		},
		{
			name:               "delete groups with multiple errors",
			groupIDs:           []string{"grp-for-policies", "grp-for-users"},
			expectedReasons:    []string{"policy", "user"},
			expectedNotDeleted: []string{"grp-for-policies", "grp-for-users"},
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			err = am.DeleteGroups(context.Background(), account.Id, groupAdminUserID, tc.groupIDs)
			if len(tc.expectedReasons) > 0 {
				assert.Error(t, err)
				var foundExpectedErrors int

				wrappedErr, ok := err.(interface{ Unwrap() []error })
				assert.Equal(t, ok, true)

				for _, e := range wrappedErr.Unwrap() {
					var sErr *status.Error
					if errors.As(e, &sErr) {
						assert.Contains(t, tc.expectedReasons, sErr.Message, "unexpected error message")
						foundExpectedErrors++
					}

					var gErr *GroupLinkError
					if errors.As(e, &gErr) {
						assert.Contains(t, tc.expectedReasons, gErr.Resource, "unexpected error resource")
						foundExpectedErrors++
					}
				}
				assert.Equal(t, len(tc.expectedReasons), foundExpectedErrors, "not all expected errors were found")
			} else {
				assert.NoError(t, err)
			}

			for _, groupID := range tc.expectedDeleted {
				_, err := am.GetGroup(context.Background(), account.Id, groupID, groupAdminUserID)
				assert.Error(t, err, "group should have been deleted: %s", groupID)
			}

			for _, groupID := range tc.expectedNotDeleted {
				group, err := am.GetGroup(context.Background(), account.Id, groupID, groupAdminUserID)
				assert.NoError(t, err, "group should not have been deleted: %s", groupID)
				assert.NotNil(t, group, "group should exist: %s", groupID)
			}
		})
	}
}

func initTestGroupAccount(am *DefaultAccountManager) (*DefaultAccountManager, *Account, error) {
	accountID := "testingAcc"
	domain := "example.com"

	groupForRoute := &nbgroup.Group{
		ID:        "grp-for-route",
		AccountID: "account-id",
		Name:      "Group for route",
		Issued:    nbgroup.GroupIssuedAPI,
		Peers:     make([]string, 0),
	}

	groupForRoute2 := &nbgroup.Group{
		ID:        "grp-for-route2",
		AccountID: "account-id",
		Name:      "Group for route",
		Issued:    nbgroup.GroupIssuedAPI,
		Peers:     make([]string, 0),
	}

	groupForNameServerGroups := &nbgroup.Group{
		ID:        "grp-for-name-server-grp",
		AccountID: "account-id",
		Name:      "Group for name server groups",
		Issued:    nbgroup.GroupIssuedAPI,
		Peers:     make([]string, 0),
	}

	groupForPolicies := &nbgroup.Group{
		ID:        "grp-for-policies",
		AccountID: "account-id",
		Name:      "Group for policies",
		Issued:    nbgroup.GroupIssuedAPI,
		Peers:     make([]string, 0),
	}

	groupForSetupKeys := &nbgroup.Group{
		ID:        "grp-for-keys",
		AccountID: "account-id",
		Name:      "Group for setup keys",
		Issued:    nbgroup.GroupIssuedAPI,
		Peers:     make([]string, 0),
	}

	groupForUsers := &nbgroup.Group{
		ID:        "grp-for-users",
		AccountID: "account-id",
		Name:      "Group for users",
		Issued:    nbgroup.GroupIssuedAPI,
		Peers:     make([]string, 0),
	}

	groupForIntegration := &nbgroup.Group{
		ID:        "grp-for-integration",
		AccountID: "account-id",
		Name:      "Group for users integration",
		Issued:    nbgroup.GroupIssuedIntegration,
		Peers:     make([]string, 0),
	}

	routeResource := &route.Route{
		ID:     "example route",
		Groups: []string{groupForRoute.ID},
	}

	routePeerGroupResource := &route.Route{
		ID:         "example route with peer groups",
		PeerGroups: []string{groupForRoute2.ID},
	}

	nameServerGroup := &nbdns.NameServerGroup{
		ID:     "example name server group",
		Groups: []string{groupForNameServerGroups.ID},
	}

	policy := &Policy{
		ID: "example policy",
		Rules: []*PolicyRule{
			{
				ID:           "example policy rule",
				Destinations: []string{groupForPolicies.ID},
			},
		},
	}

	setupKey := &SetupKey{
		Id:         "example setup key",
		AutoGroups: []string{groupForSetupKeys.ID},
	}

	user := &User{
		Id:         "example user",
		AutoGroups: []string{groupForUsers.ID},
	}
	account := newAccountWithId(context.Background(), accountID, groupAdminUserID, domain)
	account.Routes[routeResource.ID] = routeResource
	account.Routes[routePeerGroupResource.ID] = routePeerGroupResource
	account.NameServerGroups[nameServerGroup.ID] = nameServerGroup
	account.Policies = append(account.Policies, policy)
	account.SetupKeys[setupKey.Id] = setupKey
	account.Users[user.Id] = user

	err := am.Store.SaveAccount(context.Background(), account)
	if err != nil {
		return nil, nil, err
	}

	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForRoute)
	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForRoute2)
	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForNameServerGroups)
	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForPolicies)
	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForSetupKeys)
	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForUsers)
	_ = am.SaveGroup(context.Background(), accountID, groupAdminUserID, groupForIntegration)

	acc, err := am.Store.GetAccount(context.Background(), account.Id)
	if err != nil {
		return nil, nil, err
	}
	return am, acc, nil
}

func TestGroupAccountPeerUpdate(t *testing.T) {
	manager, account, peer1, peer2, peer3 := setupNetworkMapTest(t)

	err := manager.SaveGroup(context.Background(), account.Id, userID, &nbgroup.Group{
		ID:    "groupA",
		Name:  "GroupA",
		Peers: []string{peer1.ID, peer2.ID},
	})
	assert.NoError(t, err)

	updMsg := manager.peersUpdateManager.CreateChannel(context.Background(), peer1.ID)
	t.Cleanup(func() {
		manager.peersUpdateManager.CloseChannel(context.Background(), peer1.ID)
	})

	// Saving an unused group should not update account peers and not send peer update
	t.Run("saving unused group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldNotReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.SaveGroup(context.Background(), account.Id, userID, &nbgroup.Group{
			ID:    "groupB",
			Name:  "GroupB",
			Peers: []string{peer1.ID, peer2.ID},
		})
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldNotReceiveUpdate")
		}
	})

	// adding peer to an unused group should not update account peers and not send peer update
	t.Run("adding peer to unused group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldNotReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.GroupAddPeer(context.Background(), account.Id, "groupB", peer3.ID)
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldNotReceiveUpdate")
		}
	})

	// removing peer to an unused group should not update account peers and not send peer update
	t.Run("removing peer to unused group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldNotReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.GroupDeletePeer(context.Background(), account.Id, "groupB", peer3.ID)
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldNotReceiveUpdate")
		}
	})

	// Deleting group should not update account peers and not send peer update
	t.Run("deleting group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldNotReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.DeleteGroup(context.Background(), account.Id, userID, "groupB")
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldNotReceiveUpdate")
		}
	})

	// adding a group to policy
	err = manager.SavePolicy(context.Background(), account.Id, userID, &Policy{
		ID:      "policy",
		Enabled: true,
		Rules: []*PolicyRule{
			{
				Enabled:       true,
				Sources:       []string{"groupA"},
				Destinations:  []string{"groupA"},
				Bidirectional: true,
				Action:        PolicyTrafficActionAccept,
			},
		},
	})
	assert.NoError(t, err)

	// Saving a used group in policy should update account peers and send peer update
	t.Run("saving used group in policy", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.SaveGroup(context.Background(), account.Id, userID, &nbgroup.Group{
			ID:    "groupA",
			Name:  "GroupA",
			Peers: []string{peer1.ID, peer2.ID},
		})
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldReceiveUpdate")
		}
	})

	// Saving an unchanged group should trigger account peers update and not send peer update
	// since there is no change in the network map
	t.Run("saving unchanged group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldNotReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.SaveGroup(context.Background(), account.Id, userID, &nbgroup.Group{
			ID:    "groupA",
			Name:  "GroupA",
			Peers: []string{peer1.ID, peer2.ID},
		})
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldNotReceiveUpdate")
		}
	})

	// adding peer to a used group should update account peers and send peer update
	t.Run("adding peer to used group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.GroupAddPeer(context.Background(), account.Id, "groupA", peer3.ID)
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldReceiveUpdate")
		}
	})

	// removing peer to a used group should update account peers and send peer update
	t.Run("removing peer to unused group", func(t *testing.T) {
		done := make(chan struct{})
		go func() {
			peerShouldReceiveUpdate(t, updMsg)
			close(done)
		}()

		err := manager.GroupDeletePeer(context.Background(), account.Id, "groupA", peer3.ID)
		assert.NoError(t, err)

		select {
		case <-done:
		case <-time.After(200 * time.Millisecond):
			t.Error("timeout waiting for peerShouldReceiveUpdate")
		}
	})
}