package testhelper

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"net"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"testing"
	"time"

	"github.com/BurntSushi/toml"
	"github.com/golang/protobuf/jsonpb"
	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
	grpc_logrus "github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus"
	grpc_ctxtags "github.com/grpc-ecosystem/go-grpc-middleware/tags"
	log "github.com/sirupsen/logrus"
	"github.com/stretchr/testify/require"
	gitalyauth "gitlab.com/gitlab-org/gitaly/auth"
	"gitlab.com/gitlab-org/gitaly/internal/git/hooks"
	"gitlab.com/gitlab-org/gitaly/internal/gitaly/config"
	"gitlab.com/gitlab-org/gitaly/internal/gitaly/config/auth"
	serverauth "gitlab.com/gitlab-org/gitaly/internal/gitaly/server/auth"
	"gitlab.com/gitlab-org/gitaly/internal/gitlabshell"
	"gitlab.com/gitlab-org/gitaly/internal/helper/fieldextractors"
	praefectconfig "gitlab.com/gitlab-org/gitaly/internal/praefect/config"
	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
	grpccorrelation "gitlab.com/gitlab-org/labkit/correlation/grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/health"
	healthpb "google.golang.org/grpc/health/grpc_health_v1"
	"gopkg.in/yaml.v2"
)

// TestServerOpt is an option for TestServer
type TestServerOpt func(t *TestServer)

// WithToken is a TestServerOpt that provides a security token
func WithToken(token string) TestServerOpt {
	return func(t *TestServer) {
		t.token = token
	}
}

// WithStorages is a TestServerOpt that sets the storages for a TestServer
func WithStorages(storages []string) TestServerOpt {
	return func(t *TestServer) {
		t.storages = storages
	}
}

// NewTestServer instantiates a new TestServer
func NewTestServer(srv *grpc.Server, opts ...TestServerOpt) *TestServer {
	ts := &TestServer{
		grpcServer: srv,
		storages:   []string{"default"},
	}

	for _, opt := range opts {
		opt(ts)
	}

	// the health service needs to be registered in order to support health checks on all
	// gitaly services that are under test.
	// The health check is executed by the praefect in case 'test-with-praefect' verification
	// job is running.
	healthpb.RegisterHealthServer(srv, health.NewServer())

	return ts
}

// NewServerWithAuth creates a new test server with authentication
func NewServerWithAuth(tb testing.TB, streamInterceptors []grpc.StreamServerInterceptor, unaryInterceptors []grpc.UnaryServerInterceptor, token string, opts ...TestServerOpt) *TestServer {
	if token != "" {
		opts = append(opts, WithToken(token))
		streamInterceptors = append(streamInterceptors, serverauth.StreamServerInterceptor(auth.Config{Token: token}))
		unaryInterceptors = append(unaryInterceptors, serverauth.UnaryServerInterceptor(auth.Config{Token: token}))
	}

	return NewServer(
		tb,
		streamInterceptors,
		unaryInterceptors,
		opts...,
	)
}

// TestServer wraps a grpc Server and handles automatically putting a praefect in front of a gitaly instance
// if necessary
type TestServer struct {
	grpcServer *grpc.Server
	socket     string
	process    *os.Process
	token      string
	storages   []string
	waitCh     chan struct{}
}

// GrpcServer returns the underlying grpc.Server
func (p *TestServer) GrpcServer() *grpc.Server {
	return p.grpcServer
}

// Stop will stop both the grpc server as well as the praefect process
func (p *TestServer) Stop() {
	p.grpcServer.Stop()
	if p.process != nil {
		p.process.Kill()
		<-p.waitCh
	}
}

// Socket returns the socket file the test server is listening on
func (p *TestServer) Socket() string {
	return p.socket
}

// Start will start the grpc server as well as spawn a praefect instance if GITALY_TEST_PRAEFECT_BIN is enabled
func (p *TestServer) Start() error {
	praefectBinPath, ok := os.LookupEnv("GITALY_TEST_PRAEFECT_BIN")
	if !ok {
		gitalyServerSocketPath, err := p.listen()
		if err != nil {
			return err
		}

		p.socket = gitalyServerSocketPath
		return nil
	}

	tempDir, err := ioutil.TempDir("", "praefect-test-server")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tempDir)

	praefectServerSocketPath := GetTemporaryGitalySocketFileName()

	configFilePath := filepath.Join(tempDir, "config.toml")
	configFile, err := os.Create(configFilePath)
	if err != nil {
		return err
	}
	defer configFile.Close()

	c := praefectconfig.Config{
		SocketPath: praefectServerSocketPath,
		Auth: auth.Config{
			Token: p.token,
		},
		MemoryQueueEnabled: true,
		Failover: praefectconfig.Failover{
			Enabled:           true,
			BootstrapInterval: config.Duration(time.Microsecond),
			MonitorInterval:   config.Duration(time.Second),
		},
		Replication: praefectconfig.DefaultReplicationConfig(),
	}

	for _, storage := range p.storages {
		gitalyServerSocketPath, err := p.listen()
		if err != nil {
			return err
		}

		c.VirtualStorages = append(c.VirtualStorages, &praefectconfig.VirtualStorage{
			Name: storage,
			Nodes: []*praefectconfig.Node{
				{
					Storage: storage,
					Address: "unix:/" + gitalyServerSocketPath,
					Token:   p.token,
				},
			},
		})
	}

	if err := toml.NewEncoder(configFile).Encode(&c); err != nil {
		return err
	}
	if err = configFile.Sync(); err != nil {
		return err
	}
	configFile.Close()

	cmd := exec.Command(praefectBinPath, "-config", configFilePath)
	cmd.Stderr = os.Stderr
	cmd.Stdout = os.Stdout

	p.socket = praefectServerSocketPath

	if err := cmd.Start(); err != nil {
		return err
	}

	p.waitCh = make(chan struct{})
	go func() {
		cmd.Wait()
		close(p.waitCh)
	}()

	opts := []grpc.DialOption{grpc.WithInsecure()}
	if p.token != "" {
		opts = append(opts, grpc.WithPerRPCCredentials(gitalyauth.RPCCredentialsV2(p.token)))
	}

	conn, err := grpc.Dial("unix://"+praefectServerSocketPath, opts...)

	if err != nil {
		return fmt.Errorf("dial to praefect: %v", err)
	}
	defer conn.Close()

	if err = WaitHealthy(conn, 3, time.Second); err != nil {
		return err
	}

	p.process = cmd.Process

	return nil
}

func (p *TestServer) listen() (string, error) {
	gitalyServerSocketPath := GetTemporaryGitalySocketFileName()

	listener, err := net.Listen("unix", gitalyServerSocketPath)
	if err != nil {
		return "", err
	}

	go p.grpcServer.Serve(listener)

	opts := []grpc.DialOption{grpc.WithInsecure()}
	if p.token != "" {
		opts = append(opts, grpc.WithPerRPCCredentials(gitalyauth.RPCCredentialsV2(p.token)))
	}

	conn, err := grpc.Dial("unix://"+gitalyServerSocketPath, opts...)

	if err != nil {
		return "", err
	}
	defer conn.Close()

	if err := WaitHealthy(conn, 3, time.Second); err != nil {
		return "", err
	}

	return gitalyServerSocketPath, nil
}

// WaitHealthy executes health check request `retries` times and awaits each `timeout` period to respond.
// After `retries` unsuccessful attempts it returns an error.
// Returns immediately without an error once get a successful health check response.
func WaitHealthy(conn *grpc.ClientConn, retries int, timeout time.Duration) error {
	for i := 0; i < retries; i++ {
		if IsHealthy(conn, timeout) {
			return nil
		}
	}

	return errors.New("server not yet ready to serve")
}

// IsHealthy creates a health client to passed in connection and send `Check` request.
// It waits for `timeout` duration to get response back.
// It returns `true` only if remote responds with `SERVING` status.
func IsHealthy(conn *grpc.ClientConn, timeout time.Duration) bool {
	healthClient := healthpb.NewHealthClient(conn)

	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()

	resp, err := healthClient.Check(ctx, &healthpb.HealthCheckRequest{}, grpc.WaitForReady(true))
	if err != nil {
		return false
	}

	if resp.Status != healthpb.HealthCheckResponse_SERVING {
		return false
	}

	return true
}

// NewServer creates a Server for testing purposes
func NewServer(tb testing.TB, streamInterceptors []grpc.StreamServerInterceptor, unaryInterceptors []grpc.UnaryServerInterceptor, opts ...TestServerOpt) *TestServer {
	logger := NewTestLogger(tb)
	logrusEntry := log.NewEntry(logger).WithField("test", tb.Name())

	ctxTagger := grpc_ctxtags.WithFieldExtractorForInitialReq(fieldextractors.FieldExtractor)

	streamInterceptors = append([]grpc.StreamServerInterceptor{
		grpc_ctxtags.StreamServerInterceptor(ctxTagger),
		grpccorrelation.StreamServerCorrelationInterceptor(),
		grpc_logrus.StreamServerInterceptor(logrusEntry),
	}, streamInterceptors...)

	unaryInterceptors = append([]grpc.UnaryServerInterceptor{
		grpc_ctxtags.UnaryServerInterceptor(ctxTagger),
		grpccorrelation.UnaryServerCorrelationInterceptor(),
		grpc_logrus.UnaryServerInterceptor(logrusEntry),
	}, unaryInterceptors...)

	return NewTestServer(
		grpc.NewServer(
			grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(streamInterceptors...)),
			grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(unaryInterceptors...)),
		),
		opts...,
	)
}

var changeLineRegex = regexp.MustCompile("^[a-f0-9]{40} [a-f0-9]{40} refs/[^ ]+$")

const secretHeaderName = "Gitlab-Shared-Secret"

func preReceiveFormToMap(u url.Values) map[string]string {
	return map[string]string{
		"action":        u.Get("action"),
		"gl_repository": u.Get("gl_repository"),
		"project":       u.Get("project"),
		"changes":       u.Get("changes"),
		"protocol":      u.Get("protocol"),
		"env":           u.Get("env"),
		"username":      u.Get("username"),
		"key_id":        u.Get("key_id"),
		"user_id":       u.Get("user_id"),
	}
}

type postReceiveForm struct {
	GLRepository   string   `json:"gl_repository"`
	SecretToken    string   `json:"secret_token"`
	Changes        string   `json:"changes"`
	Identifier     string   `json:"identifier"`
	GitPushOptions []string `json:"push_options"`
}

func parsePostReceiveForm(u url.Values) postReceiveForm {
	return postReceiveForm{
		GLRepository:   u.Get("gl_repository"),
		SecretToken:    u.Get("secret_token"),
		Changes:        u.Get("changes"),
		Identifier:     u.Get("identifier"),
		GitPushOptions: u["push_options[]"],
	}
}

func handleAllowed(options GitlabTestServerOptions) func(w http.ResponseWriter, r *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseForm(); err != nil {
			http.Error(w, "could not parse form", http.StatusBadRequest)
			return
		}

		if r.Method != http.MethodPost {
			http.Error(w, "method not POST", http.StatusMethodNotAllowed)
			return
		}

		params := make(map[string]string)

		switch r.Header.Get("Content-Type") {
		case "application/x-www-form-urlencoded":
			params = preReceiveFormToMap(r.Form)
		case "application/json":
			if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
				http.Error(w, "could not unmarshal json body", http.StatusBadRequest)
				return
			}
		}

		user, password, _ := r.BasicAuth()
		if user != options.User || password != options.Password {
			http.Error(w, "user or password incorrect", http.StatusUnauthorized)
			return
		}

		if options.GLID != "" {
			glidSplit := strings.SplitN(options.GLID, "-", 2)
			if len(glidSplit) != 2 {
				http.Error(w, "gl_id invalid", http.StatusUnauthorized)
				return
			}

			glKey, glVal := glidSplit[0], glidSplit[1]

			var glIDMatches bool
			switch glKey {
			case "user":
				glIDMatches = glVal == params["user_id"]
			case "key":
				glIDMatches = glVal == params["key_id"]
			case "username":
				glIDMatches = glVal == params["username"]
			default:
				http.Error(w, "gl_id invalid", http.StatusUnauthorized)
				return
			}

			if !glIDMatches {
				http.Error(w, "gl_id invalid", http.StatusUnauthorized)
				return
			}
		}

		if params["gl_repository"] == "" {
			http.Error(w, "gl_repository is empty", http.StatusUnauthorized)
			return
		}

		if options.GLRepository != "" {
			if params["gl_repository"] != options.GLRepository {
				http.Error(w, "gl_repository is invalid", http.StatusUnauthorized)
				return
			}
		}

		if params["protocol"] == "" {
			http.Error(w, "protocol is empty", http.StatusUnauthorized)
			return
		}

		if options.Protocol != "" {
			if params["protocol"] != options.Protocol {
				http.Error(w, "protocol is invalid", http.StatusUnauthorized)
				return
			}
		}

		if options.Changes != "" {
			if params["changes"] != options.Changes {
				http.Error(w, "changes is invalid", http.StatusUnauthorized)
				return
			}
		} else {
			changeLines := strings.Split(strings.TrimSuffix(params["changes"], "\n"), "\n")
			for _, line := range changeLines {
				if !changeLineRegex.MatchString(line) {
					http.Error(w, "changes is invalid", http.StatusUnauthorized)
					return
				}
			}
		}

		env := params["env"]
		if len(env) == 0 {
			http.Error(w, "env is empty", http.StatusUnauthorized)
			return
		}

		var gitVars struct {
			GitAlternateObjectDirsRel []string `json:"GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE"`
			GitObjectDirRel           string   `json:"GIT_OBJECT_DIRECTORY_RELATIVE"`
		}

		w.Header().Set("Content-Type", "application/json")

		if err := json.Unmarshal([]byte(env), &gitVars); err != nil {
			http.Error(w, "could not unmarshal env", http.StatusUnauthorized)
			return
		}

		if options.GitObjectDir != "" {
			relObjectDir, err := filepath.Rel(options.RepoPath, options.GitObjectDir)
			if err != nil {
				http.Error(w, "git object dirs is invalid", http.StatusUnauthorized)
				return
			}
			if relObjectDir != gitVars.GitObjectDirRel {
				w.Write([]byte(`{"status":false}`))
				return
			}
		}

		if len(options.GitAlternateObjectDirs) > 0 {
			if len(gitVars.GitAlternateObjectDirsRel) != len(options.GitAlternateObjectDirs) {
				http.Error(w, "git alternate object dirs is invalid", http.StatusUnauthorized)
				return
			}

			for i, gitAlterateObjectDir := range options.GitAlternateObjectDirs {
				relAltObjectDir, err := filepath.Rel(options.RepoPath, gitAlterateObjectDir)
				if err != nil {
					http.Error(w, "git alternate object dirs is invalid", http.StatusUnauthorized)
					return
				}

				if relAltObjectDir != gitVars.GitAlternateObjectDirsRel[i] {
					w.Write([]byte(`{"status":false}`))
					return
				}
			}
		}

		var authenticated bool
		if r.Form.Get("secret_token") == options.SecretToken {
			authenticated = true
		}

		secretHeader, err := base64.StdEncoding.DecodeString(r.Header.Get(secretHeaderName))
		if err == nil {
			if string(secretHeader) == options.SecretToken {
				authenticated = true
			}
		}

		if authenticated {
			w.Write([]byte(`{"status":true}`))
			return
		}
		w.WriteHeader(http.StatusUnauthorized)
		w.Write([]byte(`{"message":"401 Unauthorized\n"}`))
	}
}

func handlePreReceive(options GitlabTestServerOptions) func(w http.ResponseWriter, r *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseForm(); err != nil {
			http.Error(w, "could not parse form", http.StatusBadRequest)
			return
		}

		params := make(map[string]string)

		switch r.Header.Get("Content-Type") {
		case "application/x-www-form-urlencoded":
			b, err := json.Marshal(r.Form)
			if err != nil {
				http.Error(w, "could not marshal form", http.StatusBadRequest)
				return
			}

			var reqForm struct {
				GLRepository []string `json:"gl_repository"`
			}

			if err = json.Unmarshal(b, &reqForm); err != nil {
				http.Error(w, "could not unmarshal form", http.StatusBadRequest)
				return
			}

			if len(reqForm.GLRepository) == 0 {
				http.Error(w, "gl_repository is missing", http.StatusBadRequest)
				return
			}

			params["gl_repository"] = reqForm.GLRepository[0]
		case "application/json":
			if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
				http.Error(w, "error when unmarshalling json body", http.StatusBadRequest)
				return
			}
		}

		if r.Method != http.MethodPost {
			http.Error(w, "method not POST", http.StatusMethodNotAllowed)
			return
		}

		if params["gl_repository"] == "" {
			http.Error(w, "gl_repository is empty", http.StatusUnauthorized)
			return
		}

		if options.GLRepository != "" {
			if params["gl_repository"] != options.GLRepository {
				http.Error(w, "gl_repository is invalid", http.StatusUnauthorized)
				return
			}
		}

		var authenticated bool
		if r.Form.Get("secret_token") == options.SecretToken {
			authenticated = true
		}

		secretHeader, err := base64.StdEncoding.DecodeString(r.Header.Get(secretHeaderName))
		if err == nil {
			if string(secretHeader) == options.SecretToken {
				authenticated = true
			}
		}

		if !authenticated {
			http.Error(w, "unauthorized", http.StatusUnauthorized)
			return
		}

		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(`{"reference_counter_increased": true}`))
	}
}

func handlePostReceive(options GitlabTestServerOptions) func(w http.ResponseWriter, r *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseForm(); err != nil {
			http.Error(w, "couldn't parse form", http.StatusBadRequest)
			return
		}

		if r.Method != http.MethodPost {
			http.Error(w, "method not POST", http.StatusMethodNotAllowed)
			return
		}

		var params postReceiveForm

		switch r.Header.Get("Content-Type") {
		case "application/x-www-form-urlencoded":
			params = parsePostReceiveForm(r.Form)
		case "application/json":
			if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
				http.Error(w, "could not parse json body", http.StatusBadRequest)
				return
			}
		}

		if params.GLRepository == "" {
			http.Error(w, "gl_repository is empty", http.StatusUnauthorized)
			return
		}

		if options.GLRepository != "" {
			if params.GLRepository != options.GLRepository {
				http.Error(w, "gl_repository is invalid", http.StatusUnauthorized)
				return
			}
		}

		if params.SecretToken != options.SecretToken {
			decodedSecret, err := base64.StdEncoding.DecodeString(r.Header.Get("Gitlab-Shared-Secret"))
			if err != nil {
				http.Error(w, "secret_token is invalid", http.StatusUnauthorized)
				return
			}

			if string(decodedSecret) != options.SecretToken {
				http.Error(w, "secret_token is invalid", http.StatusUnauthorized)
				return
			}
		}

		if params.Identifier == "" {
			http.Error(w, "identifier is empty", http.StatusUnauthorized)
			return
		}

		if options.GLRepository != "" {
			if params.Identifier != options.GLID {
				http.Error(w, "identifier is invalid", http.StatusUnauthorized)
				return
			}
		}

		if params.Changes == "" {
			http.Error(w, "changes is empty", http.StatusUnauthorized)
			return
		}

		if options.Changes != "" {
			if params.Changes != options.Changes {
				http.Error(w, "changes is invalid", http.StatusUnauthorized)
				return
			}
		}

		if len(options.GitPushOptions) != len(params.GitPushOptions) {
			http.Error(w, "invalid push options", http.StatusUnauthorized)
			return
		}

		for i, opt := range options.GitPushOptions {
			if opt != params.GitPushOptions[i] {
				http.Error(w, "invalid push options", http.StatusUnauthorized)
				return
			}
		}

		response := postReceiveResponse{
			ReferenceCounterDecreased: options.PostReceiveCounterDecreased,
		}

		for _, basicMessage := range options.PostReceiveMessages {
			response.Messages = append(response.Messages, postReceiveMessage{
				Message: basicMessage,
				Type:    "basic",
			})
		}

		for _, alertMessage := range options.PostReceiveAlerts {
			response.Messages = append(response.Messages, postReceiveMessage{
				Message: alertMessage,
				Type:    "alert",
			})
		}

		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		if err := json.NewEncoder(w).Encode(&response); err != nil {
			log.Fatal(err)
		}
	}
}

type postReceiveResponse struct {
	ReferenceCounterDecreased bool                 `json:"reference_counter_decreased"`
	Messages                  []postReceiveMessage `json:"messages"`
}

type postReceiveMessage struct {
	Message string `json:"message"`
	Type    string `json:"type"`
}

func handleCheck(options GitlabTestServerOptions) func(w http.ResponseWriter, r *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		u, p, ok := r.BasicAuth()
		if !ok || u != options.User || p != options.Password {
			http.Error(w, "authorization failed", http.StatusUnauthorized)
			return
		}

		w.WriteHeader(http.StatusOK)
		fmt.Fprintf(w, `{"redis": true}`)
	}
}

// GitlabTestServerOptions is a config for a mock gitlab server containing expected values
type GitlabTestServerOptions struct {
	User, Password, SecretToken string
	GLID                        string
	GLRepository                string
	Changes                     string
	PostReceiveCounterDecreased bool
	PostReceiveMessages         []string
	PostReceiveAlerts           []string
	Protocol                    string
	GitPushOptions              []string
	GitObjectDir                string
	GitAlternateObjectDirs      []string
	RepoPath                    string
	UnixSocket                  bool
	RelativeURLRoot             string
}

// NewGitlabTestServer returns a mock gitlab server that responds to the hook api endpoints
func NewGitlabTestServer(t FatalLogger, options GitlabTestServerOptions) (url string, cleanup func()) {
	mux := http.NewServeMux()
	prefix := strings.TrimRight(options.RelativeURLRoot, "/") + "/api/v4/internal"
	mux.Handle(prefix+"/allowed", http.HandlerFunc(handleAllowed(options)))
	mux.Handle(prefix+"/pre_receive", http.HandlerFunc(handlePreReceive(options)))
	mux.Handle(prefix+"/post_receive", http.HandlerFunc(handlePostReceive(options)))
	mux.Handle(prefix+"/check", http.HandlerFunc(handleCheck(options)))

	if options.UnixSocket {
		return startSocketHTTPServer(t, mux)
	} else {
		server := httptest.NewServer(mux)
		return server.URL, server.Close
	}
}

func startSocketHTTPServer(t FatalLogger, mux *http.ServeMux) (string, func()) {
	tmpFile, err := ioutil.TempFile(os.TempDir(), "http-test-server")
	if err != nil {
		t.Fatalf("Cannot create temporary file", err)
	}
	filename := tmpFile.Name()
	tmpFile.Close()
	os.Remove(filename)

	socketListener, err := net.Listen("unix", filename)
	if err != nil {
		t.Fatalf("Cannot listen to socket", err)
	}

	server := http.Server{
		Handler: mux,
	}

	go server.Serve(socketListener)

	url := "http+unix://" + filename
	cleanup := func() {
		server.Close()
	}

	return url, cleanup
}

// CreateTemporaryGitlabShellDir creates a temporary gitlab shell directory. It returns the path to the directory
// and a cleanup function
func CreateTemporaryGitlabShellDir(t testing.TB) (string, func()) {
	tempDir, err := ioutil.TempDir("", "gitlab-shell")
	require.NoError(t, err)
	return tempDir, func() {
		require.NoError(t, os.RemoveAll(tempDir))
	}
}

// WriteTemporaryGitlabShellConfigFile writes a gitlab shell config.yml in a temporary directory. It returns the path
// and a cleanup function
func WriteTemporaryGitlabShellConfigFile(t FatalLogger, dir string, config GitlabShellConfig) (string, func()) {
	out, err := yaml.Marshal(&config)
	if err != nil {
		t.Fatalf("error marshalling config", err)
	}

	path := filepath.Join(dir, "config.yml")
	if err = ioutil.WriteFile(path, out, 0644); err != nil {
		t.Fatalf("error writing gitlab shell config", err)
	}

	return path, func() {
		os.RemoveAll(path)
	}
}

// WriteTemporaryGitalyConfigFile writes a gitaly toml file into a temporary directory. It returns the path to
// the file as well as a cleanup function
func WriteTemporaryGitalyConfigFile(t testing.TB, tempDir, gitlabURL, user, password string) (string, func()) {
	path := filepath.Join(tempDir, "config.toml")
	contents := fmt.Sprintf(`
[gitlab-shell]
  dir = "%s/gitlab-shell"
  gitlab_url = %q
  [gitlab-shell.http-settings]
    user = %q
    password = %q
`, tempDir, gitlabURL, user, password)

	require.NoError(t, ioutil.WriteFile(path, []byte(contents), 0644))
	return path, func() {
		os.RemoveAll(path)
	}
}

type GlHookValues struct {
	GLID, GLUsername, GLRepo, GLProtocol, GitObjectDir string
	GitAlternateObjectDirs                             []string
}

type ProxyValues struct {
	HTTPProxy, HTTPSProxy, NoProxy string
}

var jsonpbMarshaller jsonpb.Marshaler

// EnvForHooks generates a set of environment variables for gitaly hooks
func EnvForHooks(t testing.TB, gitlabShellDir, gitalySocket, gitalyToken string, repo *gitalypb.Repository, glHookValues GlHookValues, proxyValues ProxyValues, gitPushOptions ...string) []string {
	rubyDir, err := filepath.Abs("../../ruby")
	require.NoError(t, err)

	repoString, err := jsonpbMarshaller.MarshalToString(repo)
	require.NoError(t, err)

	env, err := gitlabshell.EnvFromConfig(config.Config)
	require.NoError(t, err)

	env = append(env, os.Environ()...)
	env = append(env, []string{
		fmt.Sprintf("GITALY_RUBY_DIR=%s", rubyDir),
		fmt.Sprintf("GL_ID=%s", glHookValues.GLID),
		fmt.Sprintf("GL_REPOSITORY=%s", glHookValues.GLRepo),
		fmt.Sprintf("GL_PROTOCOL=%s", glHookValues.GLProtocol),
		fmt.Sprintf("GL_USERNAME=%s", glHookValues.GLUsername),
		fmt.Sprintf("GITALY_SOCKET=%s", gitalySocket),
		fmt.Sprintf("GITALY_TOKEN=%s", gitalyToken),
		fmt.Sprintf("GITALY_REPO=%v", repoString),
		fmt.Sprintf("GITALY_GITLAB_SHELL_DIR=%s", gitlabShellDir),
		fmt.Sprintf("GITALY_LOG_DIR=%s", gitlabShellDir),
	}...)
	env = append(env, hooks.GitPushOptions(gitPushOptions)...)

	if proxyValues.HTTPProxy != "" {
		env = append(env, fmt.Sprintf("HTTP_PROXY=%s", proxyValues.HTTPProxy))
		env = append(env, fmt.Sprintf("http_proxy=%s", proxyValues.HTTPProxy))
	}
	if proxyValues.HTTPSProxy != "" {
		env = append(env, fmt.Sprintf("HTTPS_PROXY=%s", proxyValues.HTTPSProxy))
		env = append(env, fmt.Sprintf("https_proxy=%s", proxyValues.HTTPSProxy))
	}
	if proxyValues.NoProxy != "" {
		env = append(env, fmt.Sprintf("NO_PROXY=%s", proxyValues.NoProxy))
		env = append(env, fmt.Sprintf("no_proxy=%s", proxyValues.NoProxy))
	}

	if glHookValues.GitObjectDir != "" {
		env = append(env, fmt.Sprintf("GIT_OBJECT_DIRECTORY=%s", glHookValues.GitObjectDir))
	}
	if len(glHookValues.GitAlternateObjectDirs) > 0 {
		env = append(env, fmt.Sprintf("GIT_ALTERNATE_OBJECT_DIRECTORIES=%s", strings.Join(glHookValues.GitAlternateObjectDirs, ":")))
	}

	return env
}

type FatalLogger interface {
	Fatalf(string, ...interface{})
}

// WriteShellSecretFile writes a .gitlab_shell_secret file in the specified directory
func WriteShellSecretFile(t FatalLogger, dir, secretToken string) {
	if err := ioutil.WriteFile(filepath.Join(dir, ".gitlab_shell_secret"), []byte(secretToken), 0644); err != nil {
		t.Fatalf("writing shell secret file: %v", err)
	}
}

// GitlabShellConfig contains a subset of gitlabshell's config.yml
type GitlabShellConfig struct {
	GitlabURL      string       `yaml:"gitlab_url"`
	HTTPSettings   HTTPSettings `yaml:"http_settings"`
	CustomHooksDir string       `yaml:"custom_hooks_dir"`
}

// HTTPSettings contains fields for http settings
type HTTPSettings struct {
	User     string `yaml:"user"`
	Password string `yaml:"password"`
}

func NewServerWithHealth(t testing.TB, socketName string) (*grpc.Server, *health.Server) {
	lis, err := net.Listen("unix", socketName)
	require.NoError(t, err)

	return NewHealthServerWithListener(t, lis)
}

func NewHealthServerWithListener(t testing.TB, listener net.Listener) (*grpc.Server, *health.Server) {
	srv := NewTestGrpcServer(t, nil, nil)
	healthSrvr := health.NewServer()
	healthpb.RegisterHealthServer(srv, healthSrvr)
	healthSrvr.SetServingStatus("", healthpb.HealthCheckResponse_SERVING)

	go srv.Serve(listener)

	return srv, healthSrvr
}

func SetupAndStartGitlabServer(t FatalLogger, c *GitlabTestServerOptions) (string, func()) {
	url, cleanup := NewGitlabTestServer(t, *c)

	WriteTemporaryGitlabShellConfigFile(t, config.Config.GitlabShell.Dir, GitlabShellConfig{GitlabURL: url})
	WriteShellSecretFile(t, config.Config.GitlabShell.Dir, c.SecretToken)

	return url, cleanup
}