package upgrade

import (
	"context"
	"errors"
	"fmt"
	"reflect"
	"sort"
	"testing"
	"unsafe"

	"github.com/google/go-cmp/cmp"
	"github.com/influxdata/influxdb/v2"
	"github.com/influxdata/influxdb/v2/authorization"
	"github.com/influxdata/influxdb/v2/inmem"
	"github.com/influxdata/influxdb/v2/kit/platform"
	"github.com/influxdata/influxdb/v2/kv/migration"
	"github.com/influxdata/influxdb/v2/kv/migration/all"
	"github.com/influxdata/influxdb/v2/pkg/testing/assert"
	"github.com/influxdata/influxdb/v2/tenant"
	authv1 "github.com/influxdata/influxdb/v2/v1/authorization"
	"github.com/influxdata/influxdb/v2/v1/services/meta"
	"github.com/influxdata/influxql"
	"github.com/stretchr/testify/require"
	"go.uber.org/zap"
	"go.uber.org/zap/zaptest"
	"golang.org/x/crypto/bcrypt"
)

func TestUpgradeSecurity(t *testing.T) {

	type testCase struct {
		name    string
		users   []meta.UserInfo
		db2ids  map[string][]platform.ID
		wantErr error
		want    []*influxdb.Authorization
	}

	hash := func(password string) string {
		hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
		require.NoError(t, err)
		return string(hash)
	}

	var testCases = []testCase{
		{
			name: "ordinary",
			users: []meta.UserInfo{
				{ // not upgraded because admin
					Name:  "superman",
					Admin: true,
					Hash:  hash("superman@123"),
				},
				{ // not upgraded because no privileges
					Name:  "loser",
					Admin: false,
					Hash:  hash("loser@123"),
				},
				{
					Name:  "weatherman",
					Admin: false,
					Hash:  hash("weatherman@123"),
					Privileges: map[string]influxql.Privilege{
						"water": influxql.AllPrivileges,
						"air":   influxql.AllPrivileges,
					},
				},
				{
					Name:  "hitgirl",
					Admin: false,
					Hash:  hash("hitgirl@123"),
					Privileges: map[string]influxql.Privilege{
						"hits": influxql.WritePrivilege,
					},
				},
				{
					Name:  "boss@hits.org", // special name
					Admin: false,
					Hash:  hash("boss@123"),
					Privileges: map[string]influxql.Privilege{
						"hits": influxql.AllPrivileges,
					},
				},
				{
					Name:  "viewer",
					Admin: false,
					Hash:  hash("viewer@123"),
					Privileges: map[string]influxql.Privilege{
						"water": influxql.ReadPrivilege,
						"air":   influxql.ReadPrivilege,
					},
				},
			},
			db2ids: map[string][]platform.ID{
				"water": {0x33f9d67bc9cbc5b7, 0x33f9d67bc9cbc5b8, 0x33f9d67bc9cbc5b9},
				"air":   {0x43f9d67bc9cbc5b7, 0x43f9d67bc9cbc5b8, 0x43f9d67bc9cbc5b9},
				"hits":  {0x53f9d67bc9cbc5b7},
			},
			want: []*influxdb.Authorization{
				{
					Token:       "boss@hits.org",
					Status:      "active",
					Description: "boss@hits.org's Legacy Token",
				},
				{
					Token:       "hitgirl",
					Status:      "active",
					Description: "hitgirl's Legacy Token",
				},
				{
					Token:       "viewer",
					Status:      "active",
					Description: "viewer's Legacy Token",
				},
				{
					Token:       "weatherman",
					Status:      "active",
					Description: "weatherman's Legacy Token",
				},
			},
		},
		{
			name: "missing buckets",
			users: []meta.UserInfo{
				{
					Name:  "weatherman",
					Admin: false,
					Hash:  hash("weatherman@123"),
					Privileges: map[string]influxql.Privilege{
						"water": influxql.AllPrivileges,
						"air":   influxql.AllPrivileges,
					},
				},
			},
			db2ids:  nil,
			wantErr: errors.New("upgrade: there were errors/warnings, please fix them and run the command again"),
		},
		{
			name:  "no users",
			users: []meta.UserInfo{},
		},
	}

	for _, tc := range testCases {
		tc := tc
		t.Run(tc.name, func(t *testing.T) { // better do not run in parallel
			ctx := context.Background()
			log := zaptest.NewLogger(t)

			// mock v1 meta
			v1 := &influxDBv1{
				meta: &meta.Client{},
			}
			data := &meta.Data{
				Users: tc.users,
			}
			f := reflect.ValueOf(v1.meta).Elem().Field(4)
			f = reflect.NewAt(f.Type(), unsafe.Pointer(f.UnsafeAddr())).Elem()
			f.Set(reflect.ValueOf(data))

			// mock v2 meta
			kvStore := inmem.NewKVStore()
			migrator, err := migration.NewMigrator(zap.NewNop(), kvStore, all.Migrations[:]...)
			require.NoError(t, err)
			err = migrator.Up(ctx)
			require.NoError(t, err)

			authStoreV1, err := authv1.NewStore(kvStore)
			require.NoError(t, err)

			tenantStore := tenant.NewStore(kvStore)
			tenantSvc := tenant.NewService(tenantStore)

			authStoreV2, err := authorization.NewStore(kvStore)
			require.NoError(t, err)

			v2 := &influxDBv2{
				authSvc: authv1.NewService(authStoreV1, tenantSvc),
				onboardSvc: tenant.NewOnboardService(
					tenantSvc,
					authorization.NewService(authStoreV2, tenantSvc),
				),
			}

			// onboard admin
			oReq := &influxdb.OnboardingRequest{
				User:                   "admin",
				Password:               "12345678",
				Org:                    "testers",
				Bucket:                 "def",
				RetentionPeriodSeconds: influxdb.InfiniteRetention,
			}
			oResp, err := setupAdmin(ctx, v2, oReq)
			require.NoError(t, err)

			// target options
			targetOptions := optionsV2{
				userName: oReq.User,
				orgName:  oReq.Org,
				token:    oResp.Auth.Token,
				orgID:    oResp.Auth.OrgID,
				userID:   oResp.Auth.UserID,
			}

			for k, v := range tc.db2ids {
				for i, id := range v {
					b := &influxdb.Bucket{
						ID:    id,
						Name:  fmt.Sprintf("%s_%d", k, id),
						OrgID: targetOptions.orgID,
					}
					err := tenantSvc.CreateBucket(context.Background(), b)
					require.NoError(t, err)
					tc.db2ids[k][i] = b.ID
				}
			}

			// fill in expected permissions now that we know IDs
			for _, want := range tc.want {
				for _, user := range tc.users {
					if want.Token == user.Name { // v1 username is v2 token
						var permissions []influxdb.Permission
						for db, privilege := range user.Privileges {
							ids, ok := tc.db2ids[db]
							require.True(t, ok)
							for _, id := range ids {
								id := id
								resource := influxdb.Resource{
									Type:  influxdb.BucketsResourceType,
									OrgID: &targetOptions.orgID,
									ID:    &id,
								}
								switch privilege {
								case influxql.ReadPrivilege:
									permissions = append(permissions, influxdb.Permission{
										Action:   influxdb.ReadAction,
										Resource: resource,
									})
								case influxql.WritePrivilege:
									permissions = append(permissions, influxdb.Permission{
										Action:   influxdb.WriteAction,
										Resource: resource,
									})
								case influxql.AllPrivileges:
									permissions = append(permissions, influxdb.Permission{
										Action:   influxdb.ReadAction,
										Resource: resource,
									})
									permissions = append(permissions, influxdb.Permission{
										Action:   influxdb.WriteAction,
										Resource: resource,
									})
								}
							}
						}
						want.Permissions = permissions
					}
				}
			}

			// command execution
			n, err := upgradeUsers(ctx, v1, v2, &targetOptions, tc.db2ids, log)
			assert.Equal(t, len(tc.want), n, "Upgraded count must match")
			if err != nil {
				if tc.wantErr != nil {
					if diff := cmp.Diff(tc.wantErr.Error(), err.Error()); diff != "" {
						t.Fatal(diff)
					}
				} else {
					t.Fatal(err)
				}
			} else if tc.wantErr != nil {
				t.Fatalf("should have failed with %v", tc.wantErr)
			}
			for _, want := range tc.want {
				actual, err := v2.authSvc.FindAuthorizationByToken(ctx, want.Token)
				require.NoError(t, err)
				if diff := cmp.Diff(targetOptions.orgID, actual.OrgID); diff != "" {
					t.Fatal(diff)
				}
				if diff := cmp.Diff(targetOptions.userID, actual.UserID); diff != "" {
					t.Fatal(diff)
				}
				if diff := cmp.Diff(want.Token, actual.Token); diff != "" {
					t.Fatal(diff)
				}
				if diff := cmp.Diff(want.Description, actual.Description); diff != "" {
					t.Fatal(diff)
				}
				if diff := cmp.Diff(want.Status, actual.Status); diff != "" {
					t.Fatal(diff)
				}
				sort.Slice(want.Permissions, func(i, j int) bool {
					return *(want.Permissions[i].Resource.ID) < *(want.Permissions[j].Resource.ID)
				})
				sort.Slice(actual.Permissions, func(i, j int) bool {
					return *(actual.Permissions[i].Resource.ID) < *(actual.Permissions[j].Resource.ID)
				})
				if diff := cmp.Diff(want.Permissions, actual.Permissions); diff != "" {
					t.Logf("permissions mismatch for user %s", want.Token)
					t.Fatal(diff)
				}
			}
		})
	}
}