// Copyright (c) 2022 Gitpod GmbH. All rights reserved.
// Licensed under the GNU Affero General Public License (AGPL).
// See License-AGPL.txt in the project root for license information.

package apiv1

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	connect "github.com/bufbuild/connect-go"
	"github.com/gitpod-io/gitpod/common-go/experiments"
	"github.com/gitpod-io/gitpod/common-go/experiments/experimentstest"
	db "github.com/gitpod-io/gitpod/components/gitpod-db/go"
	"github.com/gitpod-io/gitpod/components/gitpod-db/go/dbtest"
	v1 "github.com/gitpod-io/gitpod/components/public-api/go/experimental/v1"
	"github.com/gitpod-io/gitpod/components/public-api/go/experimental/v1/v1connect"
	protocol "github.com/gitpod-io/gitpod/gitpod-protocol"
	"github.com/gitpod-io/gitpod/public-api-server/pkg/auth"
	"github.com/golang/mock/gomock"
	"github.com/google/uuid"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
)

var (
	withTokenFeatureDisabled = &experimentstest.Client{
		BoolMatcher: func(ctx context.Context, experiment string, defaultValue bool, attributes experiments.Attributes) bool {
			return false
		},
	}
	withTokenFeatureEnabled = &experimentstest.Client{
		BoolMatcher: func(ctx context.Context, experiment string, defaultValue bool, attributes experiments.Attributes) bool {
			return experiment == experiments.PersonalAccessTokensEnabledFlag
		},
	}
)

func TestTokensService_CreatePersonalAccessTokenWithoutFeatureFlag(t *testing.T) {
	user := newUser(&protocol.User{})

	t.Run("permission denied when feature flag is not enabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureDisabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.CreatePersonalAccessToken(context.Background(), &connect.Request[v1.CreatePersonalAccessTokenRequest]{})

		require.Error(t, err, "This feature is currently in beta. If you would like to be part of the beta, please contact us.")
		require.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
	})

	t.Run("unimplemented when feature flag enabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.CreatePersonalAccessToken(context.Background(), &connect.Request[v1.CreatePersonalAccessTokenRequest]{})
		require.Equal(t, connect.CodeUnimplemented, connect.CodeOf(err))
	})
}

func TestTokensService_GetPersonalAccessToken(t *testing.T) {
	user := newUser(&protocol.User{})

	t.Run("permission denied when feature flag is disabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureDisabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.GetPersonalAccessToken(context.Background(), connect.NewRequest(&v1.GetPersonalAccessTokenRequest{
			Id: uuid.New().String(),
		}))

		require.Error(t, err, "This feature is currently in beta. If you would like to be part of the beta, please contact us.")
		require.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is empty", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.GetPersonalAccessToken(context.Background(), connect.NewRequest(&v1.GetPersonalAccessTokenRequest{}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is not a valid UUID", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.GetPersonalAccessToken(context.Background(), connect.NewRequest(&v1.GetPersonalAccessTokenRequest{
			Id: "foo-bar",
		}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("unimplemented when feature flag enabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.GetPersonalAccessToken(context.Background(), connect.NewRequest(&v1.GetPersonalAccessTokenRequest{
			Id: uuid.New().String(),
		}))

		require.Equal(t, connect.CodeUnimplemented, connect.CodeOf(err))
	})
}

func TestTokensService_ListPersonalAccessTokens(t *testing.T) {
	user := newUser(&protocol.User{})

	t.Run("permission denied when feature flag is disabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureDisabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.ListPersonalAccessTokens(context.Background(), connect.NewRequest(&v1.ListPersonalAccessTokensRequest{}))

		require.Error(t, err, "This feature is currently in beta. If you would like to be part of the beta, please contact us.")
		require.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
	})

	t.Run("no tokens returns empty list", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		response, err := client.ListPersonalAccessTokens(context.Background(), connect.NewRequest(&v1.ListPersonalAccessTokensRequest{}))
		require.NoError(t, err)

		requireEqualProto(t, &v1.ListPersonalAccessTokensResponse{
			Tokens:       nil,
			TotalResults: 0,
		}, response.Msg)
	})

	t.Run("lists first page of results, when no pagination preference specified", func(t *testing.T) {
		serverMock, dbConn, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		now := time.Now().UTC().Round(time.Millisecond)
		tokens := dbtest.CreatePersonalAccessTokenRecords(t, dbConn,
			dbtest.NewPersonalAccessToken(t, db.PersonalAccessToken{
				UserID:    uuid.MustParse(user.ID),
				CreatedAt: now.Add(-1 * time.Minute),
			}),
			dbtest.NewPersonalAccessToken(t, db.PersonalAccessToken{
				UserID:    uuid.MustParse(user.ID),
				CreatedAt: now,
			}),
		)

		response, err := client.ListPersonalAccessTokens(context.Background(), connect.NewRequest(&v1.ListPersonalAccessTokensRequest{}))
		require.NoError(t, err)

		requireEqualProto(t, &v1.ListPersonalAccessTokensResponse{
			Tokens:       personalAccessTokensToAPI(tokens),
			TotalResults: 2,
		}, response.Msg)
	})

	t.Run("paginating through results", func(t *testing.T) {
		now := time.Now().UTC().Round(time.Millisecond)
		serverMock, dbConn, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil).Times(3)

		var toCreate []db.PersonalAccessToken
		total := 5
		for i := 5; i > 0; i-- {
			toCreate = append(toCreate, dbtest.NewPersonalAccessToken(t, db.PersonalAccessToken{
				UserID:    uuid.MustParse(user.ID),
				CreatedAt: now.Add(time.Duration(-1*i) * time.Minute),
			}))
		}

		tokens := dbtest.CreatePersonalAccessTokenRecords(t, dbConn, toCreate...)

		firstPage, err := client.ListPersonalAccessTokens(context.Background(), connect.NewRequest(&v1.ListPersonalAccessTokensRequest{
			Pagination: &v1.Pagination{
				PageSize: 2,
				Page:     1,
			},
		}))
		require.NoError(t, err)
		requireEqualProto(t, &v1.ListPersonalAccessTokensResponse{
			Tokens:       personalAccessTokensToAPI(tokens[0:2]),
			TotalResults: int64(total),
		}, firstPage.Msg)

		secondPage, err := client.ListPersonalAccessTokens(context.Background(), connect.NewRequest(&v1.ListPersonalAccessTokensRequest{
			Pagination: &v1.Pagination{
				PageSize: 2,
				Page:     2,
			},
		}))
		require.NoError(t, err)
		requireEqualProto(t, &v1.ListPersonalAccessTokensResponse{
			Tokens:       personalAccessTokensToAPI(tokens[2:4]),
			TotalResults: int64(total),
		}, secondPage.Msg)

		thirdPage, err := client.ListPersonalAccessTokens(context.Background(), connect.NewRequest(&v1.ListPersonalAccessTokensRequest{
			Pagination: &v1.Pagination{
				PageSize: 2,
				Page:     3,
			},
		}))
		require.NoError(t, err)
		requireEqualProto(t, &v1.ListPersonalAccessTokensResponse{
			Tokens:       personalAccessTokensToAPI([]db.PersonalAccessToken{tokens[4]}),
			TotalResults: int64(total),
		}, thirdPage.Msg)
	})
}

func TestTokensService_RegeneratePersonalAccessToken(t *testing.T) {
	user := newUser(&protocol.User{})

	t.Run("permission denied when feature flag is disabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureDisabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.RegeneratePersonalAccessToken(context.Background(), connect.NewRequest(&v1.RegeneratePersonalAccessTokenRequest{
			Id: uuid.New().String(),
		}))

		require.Error(t, err, "This feature is currently in beta. If you would like to be part of the beta, please contact us.")
		require.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is empty", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.RegeneratePersonalAccessToken(context.Background(), connect.NewRequest(&v1.RegeneratePersonalAccessTokenRequest{}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is not a valid UUID", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.RegeneratePersonalAccessToken(context.Background(), connect.NewRequest(&v1.RegeneratePersonalAccessTokenRequest{
			Id: "foo-bar",
		}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("unimplemented when feature flag enabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.RegeneratePersonalAccessToken(context.Background(), connect.NewRequest(&v1.RegeneratePersonalAccessTokenRequest{
			Id: uuid.New().String(),
		}))

		require.Equal(t, connect.CodeUnimplemented, connect.CodeOf(err))
	})
}

func TestTokensService_UpdatePersonalAccessToken(t *testing.T) {
	user := newUser(&protocol.User{})

	t.Run("permission denied when feature flag is disabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureDisabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.UpdatePersonalAccessToken(context.Background(), connect.NewRequest(&v1.UpdatePersonalAccessTokenRequest{
			Token: &v1.PersonalAccessToken{
				Id: uuid.New().String(),
			},
		}))

		require.Error(t, err, "This feature is currently in beta. If you would like to be part of the beta, please contact us.")
		require.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is empty", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.UpdatePersonalAccessToken(context.Background(), connect.NewRequest(&v1.UpdatePersonalAccessTokenRequest{}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is not a valid UUID", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.UpdatePersonalAccessToken(context.Background(), connect.NewRequest(&v1.UpdatePersonalAccessTokenRequest{
			Token: &v1.PersonalAccessToken{
				Id: "foo-bar",
			},
		}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("unimplemented when feature flag enabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.UpdatePersonalAccessToken(context.Background(), connect.NewRequest(&v1.UpdatePersonalAccessTokenRequest{
			Token: &v1.PersonalAccessToken{
				Id: uuid.New().String(),
			},
		}))

		require.Equal(t, connect.CodeUnimplemented, connect.CodeOf(err))
	})
}

func TestTokensService_DeletePersonalAccessToken(t *testing.T) {
	user := newUser(&protocol.User{})

	t.Run("permission denied when feature flag is disabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureDisabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.DeletePersonalAccessToken(context.Background(), connect.NewRequest(&v1.DeletePersonalAccessTokenRequest{
			Id: uuid.New().String(),
		}))

		require.Error(t, err, "This feature is currently in beta. If you would like to be part of the beta, please contact us.")
		require.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is empty", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.DeletePersonalAccessToken(context.Background(), connect.NewRequest(&v1.DeletePersonalAccessTokenRequest{}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("invalid argument when Token ID is not a valid UUID", func(t *testing.T) {
		_, _, client := setupTokensService(t, withTokenFeatureEnabled)

		_, err := client.DeletePersonalAccessToken(context.Background(), connect.NewRequest(&v1.DeletePersonalAccessTokenRequest{
			Id: "foo-bar",
		}))

		require.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
	})

	t.Run("unimplemented when feature flag enabled", func(t *testing.T) {
		serverMock, _, client := setupTokensService(t, withTokenFeatureEnabled)

		serverMock.EXPECT().GetLoggedInUser(gomock.Any()).Return(user, nil)

		_, err := client.DeletePersonalAccessToken(context.Background(), connect.NewRequest(&v1.DeletePersonalAccessTokenRequest{
			Id: uuid.New().String(),
		}))

		require.Equal(t, connect.CodeUnimplemented, connect.CodeOf(err))
	})
}

func setupTokensService(t *testing.T, expClient experiments.Client) (*protocol.MockAPIInterface, *gorm.DB, v1connect.TokensServiceClient) {
	t.Helper()

	dbConn := dbtest.ConnectForTests(t)

	ctrl := gomock.NewController(t)
	t.Cleanup(ctrl.Finish)

	serverMock := protocol.NewMockAPIInterface(ctrl)

	svc := NewTokensService(&FakeServerConnPool{api: serverMock}, expClient, dbConn)

	_, handler := v1connect.NewTokensServiceHandler(svc, connect.WithInterceptors(auth.NewServerInterceptor()))

	srv := httptest.NewServer(handler)
	t.Cleanup(srv.Close)

	client := v1connect.NewTokensServiceClient(http.DefaultClient, srv.URL, connect.WithInterceptors(
		auth.NewClientInterceptor("auth-token"),
	))

	return serverMock, dbConn, client
}