package cmd

import (
	"bytes"
	"context"
	"crypto/tls"
	"database/sql"
	"encoding/json"
	"fmt"
	"io"
	"net"
	"net/http"
	"net/url"
	"os"
	"path"
	"path/filepath"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/Depado/ginprom"
	"github.com/Masterminds/semver/v3"
	"github.com/getsentry/sentry-go"
	"github.com/gin-gonic/gin"
	"github.com/pkg/errors"
	"github.com/urfave/cli"
	"go.uber.org/multierr"
	"go.uber.org/zap/zapcore"
	"golang.org/x/sync/errgroup"

	"github.com/jmoiron/sqlx"

	"github.com/smartcontractkit/chainlink-common/pkg/loop"
	"github.com/smartcontractkit/chainlink-common/pkg/sqlutil"
	"github.com/smartcontractkit/chainlink-common/pkg/utils/mailbox"
	"github.com/smartcontractkit/chainlink/v2/core/build"
	"github.com/smartcontractkit/chainlink/v2/core/capabilities"
	"github.com/smartcontractkit/chainlink/v2/core/chains/legacyevm"
	"github.com/smartcontractkit/chainlink/v2/core/config"
	"github.com/smartcontractkit/chainlink/v2/core/logger"
	"github.com/smartcontractkit/chainlink/v2/core/logger/audit"
	"github.com/smartcontractkit/chainlink/v2/core/services"
	"github.com/smartcontractkit/chainlink/v2/core/services/chainlink"
	"github.com/smartcontractkit/chainlink/v2/core/services/keystore"
	"github.com/smartcontractkit/chainlink/v2/core/services/periodicbackup"
	"github.com/smartcontractkit/chainlink/v2/core/services/relay/evm/mercury/wsrpc"
	"github.com/smartcontractkit/chainlink/v2/core/services/relay/evm/mercury/wsrpc/cache"
	"github.com/smartcontractkit/chainlink/v2/core/services/versioning"
	"github.com/smartcontractkit/chainlink/v2/core/services/webhook"
	"github.com/smartcontractkit/chainlink/v2/core/sessions"
	"github.com/smartcontractkit/chainlink/v2/core/static"
	"github.com/smartcontractkit/chainlink/v2/core/store/migrate"
	"github.com/smartcontractkit/chainlink/v2/core/utils"
	clhttp "github.com/smartcontractkit/chainlink/v2/core/utils/http"
	"github.com/smartcontractkit/chainlink/v2/core/web"
	"github.com/smartcontractkit/chainlink/v2/plugins"
)

var (
	initGlobalsOnce sync.Once
	prometheus      *ginprom.Prometheus
	grpcOpts        loop.GRPCOpts
)

func initGlobals(cfgProm config.Prometheus, cfgTracing config.Tracing, logger logger.Logger) error {
	// Avoid double initializations, but does not prevent relay methods from being called multiple times.
	var err error
	initGlobalsOnce.Do(func() {
		prometheus = ginprom.New(ginprom.Namespace("service"), ginprom.Token(cfgProm.AuthToken()))
		grpcOpts = loop.NewGRPCOpts(nil) // default prometheus.Registerer
		err = loop.SetupTracing(loop.TracingConfig{
			Enabled:         cfgTracing.Enabled(),
			CollectorTarget: cfgTracing.CollectorTarget(),
			NodeAttributes:  cfgTracing.Attributes(),
			SamplingRatio:   cfgTracing.SamplingRatio(),
			OnDialError:     func(error) { logger.Errorw("Failed to dial", "err", err) },
		})
	})
	return err
}

var (
	// ErrorNoAPICredentialsAvailable is returned when not run from a terminal
	// and no API credentials have been provided
	ErrorNoAPICredentialsAvailable = errors.New("API credentials must be supplied")
)

// Shell for the node, local commands and remote commands.
type Shell struct {
	Renderer
	Config                         chainlink.GeneralConfig // initialized in Before
	Logger                         logger.Logger           // initialized in Before
	CloseLogger                    func() error            // called in After
	AppFactory                     AppFactory
	KeyStoreAuthenticator          TerminalKeyStoreAuthenticator
	FallbackAPIInitializer         APIInitializer
	Runner                         Runner
	HTTP                           HTTPClient
	CookieAuthenticator            CookieAuthenticator
	FileSessionRequestBuilder      SessionRequestBuilder
	PromptingSessionRequestBuilder SessionRequestBuilder
	ChangePasswordPrompter         ChangePasswordPrompter
	PasswordPrompter               PasswordPrompter

	configFiles      []string
	configFilesIsSet bool
	secretsFiles     []string
	secretsFileIsSet bool
}

func (s *Shell) errorOut(err error) cli.ExitCoder {
	if err != nil {
		return cli.NewExitError(err.Error(), 1)
	}
	return nil
}

// exitOnConfigError is helper that executes as validation func and
// pretty-prints errors
func (s *Shell) configExitErr(validateFn func() error) cli.ExitCoder {
	err := validateFn()
	if err != nil {
		fmt.Println("Invalid configuration:", err)
		fmt.Println()
		return s.errorOut(errors.New("invalid configuration"))
	}
	return nil
}

// AppFactory implements the NewApplication method.
type AppFactory interface {
	NewApplication(ctx context.Context, cfg chainlink.GeneralConfig, appLggr logger.Logger, db *sqlx.DB) (chainlink.Application, error)
}

// ChainlinkAppFactory is used to create a new Application.
type ChainlinkAppFactory struct{}

// NewApplication returns a new instance of the node with the given config.
func (n ChainlinkAppFactory) NewApplication(ctx context.Context, cfg chainlink.GeneralConfig, appLggr logger.Logger, db *sqlx.DB) (app chainlink.Application, err error) {
	err = initGlobals(cfg.Prometheus(), cfg.Tracing(), appLggr)
	if err != nil {
		appLggr.Errorf("Failed to initialize globals: %v", err)
	}

	err = migrate.SetMigrationENVVars(cfg)
	if err != nil {
		return nil, err
	}

	err = handleNodeVersioning(ctx, db, appLggr, cfg.RootDir(), cfg.Database(), cfg.WebServer().HTTPPort())
	if err != nil {
		return nil, err
	}

	ds := sqlutil.WrapDataSource(db, appLggr, sqlutil.TimeoutHook(cfg.Database().DefaultQueryTimeout), sqlutil.MonitorHook(cfg.Database().LogSQL))

	keyStore := keystore.New(ds, utils.GetScryptParams(cfg), appLggr)
	mailMon := mailbox.NewMonitor(cfg.AppID().String(), appLggr.Named("Mailbox"))

	loopRegistry := plugins.NewLoopRegistry(appLggr, cfg.Tracing())

	mercuryPool := wsrpc.NewPool(appLggr, cache.Config{
		LatestReportTTL:      cfg.Mercury().Cache().LatestReportTTL(),
		MaxStaleAge:          cfg.Mercury().Cache().MaxStaleAge(),
		LatestReportDeadline: cfg.Mercury().Cache().LatestReportDeadline(),
	})

	capabilitiesRegistry := capabilities.NewRegistry(appLggr)

	// create the relayer-chain interoperators from application configuration
	relayerFactory := chainlink.RelayerFactory{
		Logger:               appLggr,
		LoopRegistry:         loopRegistry,
		GRPCOpts:             grpcOpts,
		MercuryPool:          mercuryPool,
		CapabilitiesRegistry: capabilitiesRegistry,
	}

	evmFactoryCfg := chainlink.EVMFactoryConfig{
		CSAETHKeystore:     keyStore,
		ChainOpts:          legacyevm.ChainOpts{AppConfig: cfg, MailMon: mailMon, DS: ds},
		MercuryTransmitter: cfg.Mercury().Transmitter(),
	}
	// evm always enabled for backward compatibility
	// TODO BCF-2510 this needs to change in order to clear the path for EVM extraction
	initOps := []chainlink.CoreRelayerChainInitFunc{chainlink.InitDummy(ctx, relayerFactory), chainlink.InitEVM(ctx, relayerFactory, evmFactoryCfg)}

	if cfg.CosmosEnabled() {
		cosmosCfg := chainlink.CosmosFactoryConfig{
			Keystore:    keyStore.Cosmos(),
			TOMLConfigs: cfg.CosmosConfigs(),
			DS:          ds,
		}
		initOps = append(initOps, chainlink.InitCosmos(ctx, relayerFactory, cosmosCfg))
	}
	if cfg.SolanaEnabled() {
		solanaCfg := chainlink.SolanaFactoryConfig{
			Keystore:    keyStore.Solana(),
			TOMLConfigs: cfg.SolanaConfigs(),
		}
		initOps = append(initOps, chainlink.InitSolana(ctx, relayerFactory, solanaCfg))
	}
	if cfg.StarkNetEnabled() {
		starkCfg := chainlink.StarkNetFactoryConfig{
			Keystore:    keyStore.StarkNet(),
			TOMLConfigs: cfg.StarknetConfigs(),
		}
		initOps = append(initOps, chainlink.InitStarknet(ctx, relayerFactory, starkCfg))
	}

	relayChainInterops, err := chainlink.NewCoreRelayerChainInteroperators(initOps...)
	if err != nil {
		return nil, err
	}

	// Configure and optionally start the audit log forwarder service
	auditLogger, err := audit.NewAuditLogger(appLggr, cfg.AuditLogger())
	if err != nil {
		return nil, err
	}

	restrictedClient := clhttp.NewRestrictedHTTPClient(cfg.Database(), appLggr)
	unrestrictedClient := clhttp.NewUnrestrictedHTTPClient()
	externalInitiatorManager := webhook.NewExternalInitiatorManager(ds, unrestrictedClient)
	return chainlink.NewApplication(chainlink.ApplicationOpts{
		Config:                     cfg,
		DS:                         ds,
		KeyStore:                   keyStore,
		RelayerChainInteroperators: relayChainInterops,
		MailMon:                    mailMon,
		Logger:                     appLggr,
		AuditLogger:                auditLogger,
		ExternalInitiatorManager:   externalInitiatorManager,
		Version:                    static.Version,
		RestrictedHTTPClient:       restrictedClient,
		UnrestrictedHTTPClient:     unrestrictedClient,
		SecretGenerator:            chainlink.FilePersistedSecretGenerator{},
		LoopRegistry:               loopRegistry,
		GRPCOpts:                   grpcOpts,
		MercuryPool:                mercuryPool,
		CapabilitiesRegistry:       capabilitiesRegistry,
	})
}

// handleNodeVersioning is a setup-time helper to encapsulate version changes and db migration
func handleNodeVersioning(ctx context.Context, db *sqlx.DB, appLggr logger.Logger, rootDir string, cfg config.Database, healthReportPort uint16) error {
	var err error
	// Set up the versioning Configs
	verORM := versioning.NewORM(db, appLggr)
	ibhr := services.NewStartUpHealthReport(healthReportPort, appLggr)
	ibhr.Start()
	defer ibhr.Stop()

	if static.Version != static.Unset {
		var appv, dbv *semver.Version
		appv, dbv, err = versioning.CheckVersion(ctx, db, appLggr, static.Version)
		if err != nil {
			// Exit immediately and don't touch the database if the app version is too old
			return fmt.Errorf("CheckVersion: %w", err)
		}

		// Take backup if app version is newer than DB version
		// Need to do this BEFORE migration
		backupCfg := cfg.Backup()
		if backupCfg.Mode() != config.DatabaseBackupModeNone && backupCfg.OnVersionUpgrade() {
			if err = takeBackupIfVersionUpgrade(cfg.URL(), rootDir, cfg.Backup(), appLggr, appv, dbv, healthReportPort); err != nil {
				if errors.Is(err, sql.ErrNoRows) {
					appLggr.Debugf("Failed to find any node version in the DB: %v", err)
				} else if strings.Contains(err.Error(), "relation \"node_versions\" does not exist") {
					appLggr.Debugf("Failed to find any node version in the DB, the node_versions table does not exist yet: %v", err)
				} else {
					return fmt.Errorf("initializeORM#FindLatestNodeVersion: %w", err)
				}
			}
		}
	}

	// Migrate the database
	if cfg.MigrateDatabase() {
		if err = migrate.Migrate(ctx, db.DB); err != nil {
			return fmt.Errorf("initializeORM#Migrate: %w", err)
		}
	}

	// Update to latest version
	if static.Version != static.Unset {
		version := versioning.NewNodeVersion(static.Version)
		if err = verORM.UpsertNodeVersion(ctx, version); err != nil {
			return fmt.Errorf("UpsertNodeVersion: %w", err)
		}
	}
	return nil
}

func takeBackupIfVersionUpgrade(dbUrl url.URL, rootDir string, cfg periodicbackup.BackupConfig, lggr logger.Logger, appv, dbv *semver.Version, healthReportPort uint16) (err error) {
	if appv == nil {
		lggr.Debug("Application version is missing, skipping automatic DB backup.")
		return nil
	}
	if dbv == nil {
		lggr.Debug("Database version is missing, skipping automatic DB backup.")
		return nil
	}
	if !appv.GreaterThan(dbv) {
		lggr.Debugf("Application version %s is older or equal to database version %s, skipping automatic DB backup.", appv.String(), dbv.String())
		return nil
	}
	lggr.Infof("Upgrade detected: application version %s is newer than database version %s, taking automatic DB backup. To skip automatic database backup before version upgrades, set Database.Backup.OnVersionUpgrade=false. To disable backups entirely set Database.Backup.Mode=none.", appv.String(), dbv.String())

	databaseBackup, err := periodicbackup.NewDatabaseBackup(dbUrl, rootDir, cfg, lggr)
	if err != nil {
		return errors.Wrap(err, "takeBackupIfVersionUpgrade failed")
	}

	//Because backups can take a long time we must start a "fake" health report to prevent
	//node shutdown because of healthcheck fail/timeout
	err = databaseBackup.RunBackup(appv.String())
	return err
}

// Runner implements the Run method.
type Runner interface {
	Run(context.Context, chainlink.Application) error
}

// ChainlinkRunner is used to run the node application.
type ChainlinkRunner struct{}

// Run sets the log level based on config and starts the web router to listen
// for input and return data.
func (n ChainlinkRunner) Run(ctx context.Context, app chainlink.Application) error {
	config := app.GetConfig()

	mode := gin.ReleaseMode
	if !build.IsProd() && config.Log().Level() < zapcore.InfoLevel {
		mode = gin.DebugMode
	}
	gin.SetMode(mode)
	gin.DebugPrintRouteFunc = func(httpMethod, absolutePath, handlerName string, nuHandlers int) {
		app.GetLogger().Debugf("%-6s %-25s --> %s (%d handlers)", httpMethod, absolutePath, handlerName, nuHandlers)
	}

	if err := sentryInit(config.Sentry()); err != nil {
		return errors.Wrap(err, "failed to initialize sentry")
	}

	ws := config.WebServer()
	if ws.HTTPPort() == 0 && ws.TLS().HTTPSPort() == 0 {
		return errors.New("You must specify at least one port to listen on")
	}

	handler, err := web.NewRouter(app, prometheus)
	if err != nil {
		return errors.Wrap(err, "failed to create web router")
	}
	server := server{handler: handler, lggr: app.GetLogger()}

	g, gCtx := errgroup.WithContext(ctx)
	serverStartTimeoutDuration := config.WebServer().StartTimeout()
	if ws.HTTPPort() != 0 {
		go tryRunServerUntilCancelled(gCtx, app.GetLogger(), serverStartTimeoutDuration, func() error {
			return server.run(ws.ListenIP(), ws.HTTPPort(), config.WebServer().HTTPWriteTimeout())
		})
	}

	tls := config.WebServer().TLS()
	if tls.HTTPSPort() != 0 {
		go tryRunServerUntilCancelled(gCtx, app.GetLogger(), serverStartTimeoutDuration, func() error {
			return server.runTLS(
				tls.ListenIP(),
				tls.HTTPSPort(),
				tls.CertFile(),
				tls.KeyFile(),
				config.WebServer().HTTPWriteTimeout())
		})
	}

	g.Go(func() error {
		<-gCtx.Done()
		var err error
		if server.httpServer != nil {
			err = errors.WithStack(server.httpServer.Shutdown(context.Background()))
		}
		if server.tlsServer != nil {
			err = multierr.Combine(err, errors.WithStack(server.tlsServer.Shutdown(context.Background())))
		}
		return err
	})

	return errors.WithStack(g.Wait())
}

func sentryInit(cfg config.Sentry) error {
	sentrydsn := cfg.DSN()
	if sentrydsn == "" {
		// Do not initialize sentry at all if the DSN is missing
		return nil
	}

	var sentryenv string
	if env := cfg.Environment(); env != "" {
		sentryenv = env
	} else if !build.IsProd() {
		sentryenv = "dev"
	} else {
		sentryenv = "prod"
	}

	var sentryrelease string
	if release := cfg.Release(); release != "" {
		sentryrelease = release
	} else {
		sentryrelease = static.Version
	}

	return sentry.Init(sentry.ClientOptions{
		// AttachStacktrace is needed to send stacktrace alongside panics
		AttachStacktrace: true,
		Dsn:              sentrydsn,
		Environment:      sentryenv,
		Release:          sentryrelease,
		Debug:            cfg.Debug(),
	})
}

func tryRunServerUntilCancelled(ctx context.Context, lggr logger.Logger, timeout time.Duration, runServer func() error) {
	for {
		// try calling runServer() and log error if any
		if err := runServer(); err != nil {
			if !errors.Is(err, http.ErrServerClosed) {
				lggr.Criticalf("Error starting server: %v", err)
			}
		}
		// if ctx is cancelled, we must leave the loop
		select {
		case <-ctx.Done():
			return
		case <-time.After(timeout):
			// pause between attempts, default 15s
		}
	}
}

type server struct {
	httpServer *http.Server
	tlsServer  *http.Server
	handler    *gin.Engine
	lggr       logger.Logger
}

func (s *server) run(ip net.IP, port uint16, writeTimeout time.Duration) error {
	addr := fmt.Sprintf("%s:%d", ip.String(), port)
	s.lggr.Infow(fmt.Sprintf("Listening and serving HTTP on %s", addr), "ip", ip, "port", port)
	s.httpServer = createServer(s.handler, addr, writeTimeout)
	err := s.httpServer.ListenAndServe()
	return errors.Wrap(err, "failed to run plaintext HTTP server")
}

func (s *server) runTLS(ip net.IP, port uint16, certFile, keyFile string, requestTimeout time.Duration) error {
	addr := fmt.Sprintf("%s:%d", ip.String(), port)
	s.lggr.Infow(fmt.Sprintf("Listening and serving HTTPS on %s", addr), "ip", ip, "port", port)
	s.tlsServer = createServer(s.handler, addr, requestTimeout)
	err := s.tlsServer.ListenAndServeTLS(certFile, keyFile)
	return errors.Wrap(err, "failed to run TLS server (NOTE: you can disable TLS server completely and silence these errors by setting WebServer.TLS.HTTPSPort=0 in your config)")
}

func createServer(handler *gin.Engine, addr string, requestTimeout time.Duration) *http.Server {
	s := &http.Server{
		Addr:           addr,
		Handler:        handler,
		ReadTimeout:    requestTimeout,
		WriteTimeout:   requestTimeout,
		IdleTimeout:    60 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}
	return s
}

// HTTPClient encapsulates all methods used to interact with a chainlink node API.
type HTTPClient interface {
	Get(context.Context, string, ...map[string]string) (*http.Response, error)
	Post(context.Context, string, io.Reader) (*http.Response, error)
	Put(context.Context, string, io.Reader) (*http.Response, error)
	Patch(context.Context, string, io.Reader, ...map[string]string) (*http.Response, error)
	Delete(context.Context, string) (*http.Response, error)
}

type authenticatedHTTPClient struct {
	client         *http.Client
	cookieAuth     CookieAuthenticator
	sessionRequest sessions.SessionRequest
	remoteNodeURL  url.URL
}

// NewAuthenticatedHTTPClient uses the CookieAuthenticator to generate a sessionID
// which is then used for all subsequent HTTP API requests.
func NewAuthenticatedHTTPClient(lggr logger.Logger, clientOpts ClientOpts, cookieAuth CookieAuthenticator, sessionRequest sessions.SessionRequest) HTTPClient {
	return &authenticatedHTTPClient{
		client:         newHttpClient(lggr, clientOpts.InsecureSkipVerify),
		cookieAuth:     cookieAuth,
		sessionRequest: sessionRequest,
		remoteNodeURL:  clientOpts.RemoteNodeURL,
	}
}

func newHttpClient(lggr logger.Logger, insecureSkipVerify bool) *http.Client {
	tr := &http.Transport{
		// User enables this at their own risk!
		// #nosec G402
		TLSClientConfig: &tls.Config{InsecureSkipVerify: insecureSkipVerify},
	}
	if insecureSkipVerify {
		lggr.Warn("InsecureSkipVerify is on, skipping SSL certificate verification.")
	}
	return &http.Client{Transport: tr}
}

// Get performs an HTTP Get using the authenticated HTTP client's cookie.
func (h *authenticatedHTTPClient) Get(ctx context.Context, path string, headers ...map[string]string) (*http.Response, error) {
	return h.doRequest(ctx, "GET", path, nil, headers...)
}

// Post performs an HTTP Post using the authenticated HTTP client's cookie.
func (h *authenticatedHTTPClient) Post(ctx context.Context, path string, body io.Reader) (*http.Response, error) {
	return h.doRequest(ctx, "POST", path, body)
}

// Put performs an HTTP Put using the authenticated HTTP client's cookie.
func (h *authenticatedHTTPClient) Put(ctx context.Context, path string, body io.Reader) (*http.Response, error) {
	return h.doRequest(ctx, "PUT", path, body)
}

// Patch performs an HTTP Patch using the authenticated HTTP client's cookie.
func (h *authenticatedHTTPClient) Patch(ctx context.Context, path string, body io.Reader, headers ...map[string]string) (*http.Response, error) {
	return h.doRequest(ctx, "PATCH", path, body, headers...)
}

// Delete performs an HTTP Delete using the authenticated HTTP client's cookie.
func (h *authenticatedHTTPClient) Delete(ctx context.Context, path string) (*http.Response, error) {
	return h.doRequest(ctx, "DELETE", path, nil)
}

func (h *authenticatedHTTPClient) doRequest(ctx context.Context, verb, path string, body io.Reader, headerArgs ...map[string]string) (*http.Response, error) {
	var headers map[string]string
	if len(headerArgs) > 0 {
		headers = headerArgs[0]
	} else {
		headers = map[string]string{}
	}

	request, err := http.NewRequestWithContext(ctx, verb, h.remoteNodeURL.String()+path, body)
	if err != nil {
		return nil, err
	}

	request.Header.Set("Content-Type", "application/json")
	for key, value := range headers {
		request.Header.Add(key, value)
	}
	cookie, err := h.cookieAuth.Cookie()
	if err != nil {
		return nil, err
	} else if cookie != nil {
		request.AddCookie(cookie)
	}

	response, err := h.client.Do(request)
	if err != nil {
		return response, err
	}
	if response.StatusCode == http.StatusUnauthorized && (h.sessionRequest.Email != "" || h.sessionRequest.Password != "") {
		var cookieerr error
		cookie, cookieerr = h.cookieAuth.Authenticate(ctx, h.sessionRequest)
		if cookieerr != nil {
			return response, err
		}
		request.Header.Set("Cookie", "")
		request.AddCookie(cookie)
		response, err = h.client.Do(request)
		if err != nil {
			return response, err
		}
	}
	return response, nil
}

// CookieAuthenticator is the interface to generating a cookie to authenticate
// future HTTP requests.
type CookieAuthenticator interface {
	Cookie() (*http.Cookie, error)
	Authenticate(context.Context, sessions.SessionRequest) (*http.Cookie, error)
	Logout() error
}

type ClientOpts struct {
	RemoteNodeURL      url.URL
	InsecureSkipVerify bool
}

// SessionCookieAuthenticator is a concrete implementation of CookieAuthenticator
// that retrieves a session id for the user with credentials from the session request.
type SessionCookieAuthenticator struct {
	config ClientOpts
	store  CookieStore
	lggr   logger.SugaredLogger
}

// NewSessionCookieAuthenticator creates a SessionCookieAuthenticator using the passed config
// and builder.
func NewSessionCookieAuthenticator(config ClientOpts, store CookieStore, lggr logger.Logger) CookieAuthenticator {
	return &SessionCookieAuthenticator{config: config, store: store, lggr: logger.Sugared(lggr)}
}

// Cookie Returns the previously saved authentication cookie.
func (t *SessionCookieAuthenticator) Cookie() (*http.Cookie, error) {
	return t.store.Retrieve()
}

// Authenticate retrieves a session ID via a cookie and saves it to disk.
func (t *SessionCookieAuthenticator) Authenticate(ctx context.Context, sessionRequest sessions.SessionRequest) (*http.Cookie, error) {
	b := new(bytes.Buffer)
	err := json.NewEncoder(b).Encode(sessionRequest)
	if err != nil {
		return nil, err
	}
	url := t.config.RemoteNodeURL.String() + "/sessions"
	req, err := http.NewRequestWithContext(ctx, "POST", url, b)
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/json")

	client := newHttpClient(t.lggr, t.config.InsecureSkipVerify)
	resp, err := client.Do(req)
	if err != nil {
		return nil, err
	}
	defer t.lggr.ErrorIfFn(resp.Body.Close, "Error closing Authenticate response body")

	_, err = parseResponse(resp)
	if err != nil {
		return nil, err
	}

	cookies := resp.Cookies()
	if len(cookies) == 0 {
		return nil, errors.New("did not receive cookie with session id")
	}
	sc := web.FindSessionCookie(cookies)
	return sc, t.store.Save(sc)
}

// Deletes any stored session
func (t *SessionCookieAuthenticator) Logout() error {
	return t.store.Reset()
}

// CookieStore is a place to store and retrieve cookies.
type CookieStore interface {
	Save(cookie *http.Cookie) error
	Retrieve() (*http.Cookie, error)
	Reset() error
}

// MemoryCookieStore keeps a single cookie in memory
type MemoryCookieStore struct {
	Cookie *http.Cookie
}

// Save stores a cookie.
func (m *MemoryCookieStore) Save(cookie *http.Cookie) error {
	m.Cookie = cookie
	return nil
}

// Removes any stored cookie.
func (m *MemoryCookieStore) Reset() error {
	m.Cookie = nil
	return nil
}

// Retrieve returns any Saved cookies.
func (m *MemoryCookieStore) Retrieve() (*http.Cookie, error) {
	return m.Cookie, nil
}

type DiskCookieConfig interface {
	RootDir() string
}

// DiskCookieStore saves a single cookie in the local cli working directory.
type DiskCookieStore struct {
	Config DiskCookieConfig
}

// Save stores a cookie.
func (d DiskCookieStore) Save(cookie *http.Cookie) error {
	return os.WriteFile(d.cookiePath(), []byte(cookie.String()), 0600)
}

// Removes any stored cookie.
func (d DiskCookieStore) Reset() error {
	// Write empty bytes
	return os.WriteFile(d.cookiePath(), []byte(""), 0600)
}

// Retrieve returns any Saved cookies.
func (d DiskCookieStore) Retrieve() (*http.Cookie, error) {
	b, err := os.ReadFile(d.cookiePath())
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, multierr.Append(errors.New("unable to retrieve credentials, you must first login through the CLI"), err)
	}
	header := http.Header{}
	header.Add("Cookie", string(b))
	request := http.Request{Header: header}
	cookies := request.Cookies()
	if len(cookies) == 0 {
		return nil, errors.New("Cookie not in file, you must first login through the CLI")
	}
	return request.Cookies()[0], nil
}

func (d DiskCookieStore) cookiePath() string {
	return path.Join(d.Config.RootDir(), "cookie")
}

type UserCache struct {
	dir        string
	lggr       func() logger.Logger // func b/c we don't have the final logger at construction time
	ensureOnce sync.Once
}

func NewUserCache(subdir string, lggr func() logger.Logger) (*UserCache, error) {
	cd, err := os.UserCacheDir()
	if err != nil {
		return nil, err
	}
	return &UserCache{dir: filepath.Join(cd, "chainlink", subdir), lggr: lggr}, nil
}

func (cs *UserCache) ensure() {
	if err := os.MkdirAll(cs.dir, 0700); err != nil {
		cs.lggr().Errorw("Failed to make user cache dir", "dir", cs.dir, "err", err)
	}
}

func (cs *UserCache) RootDir() string {
	cs.ensureOnce.Do(cs.ensure)
	return cs.dir
}

// SessionRequestBuilder is an interface that returns a SessionRequest,
// abstracting how session requests are generated, whether they be from
// the prompt or from a file.
type SessionRequestBuilder interface {
	Build(flag string) (sessions.SessionRequest, error)
}

type promptingSessionRequestBuilder struct {
	prompter Prompter
}

// NewPromptingSessionRequestBuilder uses a prompter, often via terminal,
// to solicit information from a user to generate the SessionRequest.
func NewPromptingSessionRequestBuilder(prompter Prompter) SessionRequestBuilder {
	return promptingSessionRequestBuilder{prompter}
}

func (p promptingSessionRequestBuilder) Build(string) (sessions.SessionRequest, error) {
	email := p.prompter.Prompt("Enter email: ")
	pwd := p.prompter.PasswordPrompt("Enter password: ")
	return sessions.SessionRequest{Email: email, Password: pwd}, nil
}

type fileSessionRequestBuilder struct {
	lggr logger.Logger
}

// NewFileSessionRequestBuilder pulls credentials from a file to generate a SessionRequest.
func NewFileSessionRequestBuilder(lggr logger.Logger) SessionRequestBuilder {
	return &fileSessionRequestBuilder{lggr: lggr}
}

func (f *fileSessionRequestBuilder) Build(file string) (sessions.SessionRequest, error) {
	return credentialsFromFile(file, f.lggr.With("file", file))
}

// APIInitializer is the interface used to create the API User credentials
// needed to access the API. Does nothing if API user already exists.
type APIInitializer interface {
	// Initialize creates a new local Admin user for API access, or does nothing if one exists.
	Initialize(ctx context.Context, orm sessions.BasicAdminUsersORM, lggr logger.Logger) (sessions.User, error)
}

type promptingAPIInitializer struct {
	prompter Prompter
}

// NewPromptingAPIInitializer creates a concrete instance of APIInitializer
// that uses the terminal to solicit credentials from the user.
func NewPromptingAPIInitializer(prompter Prompter) APIInitializer {
	return &promptingAPIInitializer{prompter: prompter}
}

// Initialize uses the terminal to get credentials that it then saves in the store.
func (t *promptingAPIInitializer) Initialize(ctx context.Context, orm sessions.BasicAdminUsersORM, lggr logger.Logger) (sessions.User, error) {
	// Load list of users to determine which to assume, or if a user needs to be created
	dbUsers, err := orm.ListUsers(ctx)
	if err != nil {
		return sessions.User{}, errors.Wrap(err, "Unable to List users for initialization")
	}

	// If there are no users in the database, prompt for initial admin user creation
	if len(dbUsers) == 0 {
		if !t.prompter.IsTerminal() {
			return sessions.User{}, ErrorNoAPICredentialsAvailable
		}

		for {
			email := t.prompter.Prompt("Enter API Email: ")
			pwd := t.prompter.PasswordPrompt("Enter API Password: ")
			// On a fresh DB, create an admin user
			user, err2 := sessions.NewUser(email, pwd, sessions.UserRoleAdmin)
			if err2 != nil {
				lggr.Errorw("Error creating API user", "err", err2)
				continue
			}
			if err = orm.CreateUser(ctx, &user); err != nil {
				lggr.Errorw("Error creating API user", "err", err)
			}
			return user, err
		}
	}

	// Attempt to contextually return the correct admin user, CLI access here implies admin
	if adminUser, found := attemptAssumeAdminUser(dbUsers, lggr); found {
		return adminUser, nil
	}

	// Otherwise, multiple admin users exist, prompt for which to use
	email := t.prompter.Prompt("Enter email of API user account to assume: ")
	user, err := orm.FindUser(ctx, email)

	if err != nil {
		return sessions.User{}, err
	}
	return user, nil
}

type fileAPIInitializer struct {
	file string
}

// NewFileAPIInitializer creates a concrete instance of APIInitializer
// that pulls API user credentials from the passed file path.
func NewFileAPIInitializer(file string) APIInitializer {
	return fileAPIInitializer{file: file}
}

func (f fileAPIInitializer) Initialize(ctx context.Context, orm sessions.BasicAdminUsersORM, lggr logger.Logger) (sessions.User, error) {
	request, err := credentialsFromFile(f.file, lggr)
	if err != nil {
		return sessions.User{}, err
	}

	// Load list of users to determine which to assume, or if a user needs to be created
	dbUsers, err := orm.ListUsers(ctx)
	if err != nil {
		return sessions.User{}, errors.Wrap(err, "Unable to List users for initialization")
	}

	// If there are no users in the database, create initial admin user from session request from file creds
	if len(dbUsers) == 0 {
		user, err2 := sessions.NewUser(request.Email, request.Password, sessions.UserRoleAdmin)
		if err2 != nil {
			return user, errors.Wrap(err2, "failed to instantiate new user")
		}
		return user, orm.CreateUser(ctx, &user)
	}

	// Attempt to contextually return the correct admin user, CLI access here implies admin
	if adminUser, found := attemptAssumeAdminUser(dbUsers, lggr); found {
		return adminUser, nil
	}

	// Otherwise, multiple admin users exist, attempt to load email specified in session request
	user, err := orm.FindUser(ctx, request.Email)
	if err != nil {
		return sessions.User{}, err
	}
	return user, nil
}

func attemptAssumeAdminUser(users []sessions.User, lggr logger.Logger) (sessions.User, bool) {
	if len(users) == 0 {
		return sessions.User{}, false
	}

	// If there is only a single DB user, select it within the context of CLI
	if len(users) == 1 {
		lggr.Infow("Defaulted to assume single DB API User", "email", users[0].Email)
		return users[0], true
	}

	// If there is only one admin user, use it within the context of CLI
	var singleAdmin sessions.User
	populatedUser := false
	for _, user := range users {
		if user.Role == sessions.UserRoleAdmin {
			// If multiple admin users found, don't use assume any and clear to continue to prompt
			if populatedUser {
				// Clear flag to skip return
				populatedUser = false
				break
			}
			singleAdmin = user
			populatedUser = true
		}
	}
	if populatedUser {
		lggr.Infow("Defaulted to assume single DB admin API User", "email", singleAdmin)
		return singleAdmin, true
	}

	return sessions.User{}, false
}

var ErrNoCredentialFile = errors.New("no API user credential file was passed")

func credentialsFromFile(file string, lggr logger.Logger) (sessions.SessionRequest, error) {
	if len(file) == 0 {
		return sessions.SessionRequest{}, ErrNoCredentialFile
	}

	lggr.Debug("Initializing API credentials")
	dat, err := os.ReadFile(file)
	if err != nil {
		return sessions.SessionRequest{}, err
	}
	lines := strings.Split(string(dat), "\n")
	if len(lines) < 2 {
		return sessions.SessionRequest{}, fmt.Errorf("malformed API credentials file does not have at least two lines at %s", file)
	}
	credentials := sessions.SessionRequest{
		Email:    strings.TrimSpace(lines[0]),
		Password: strings.TrimSpace(lines[1]),
	}
	return credentials, nil
}

// ChangePasswordPrompter is an interface primarily used for DI to obtain a
// password change request from the User.
type ChangePasswordPrompter interface {
	Prompt() (web.UpdatePasswordRequest, error)
}

// NewChangePasswordPrompter returns the production password change request prompter
func NewChangePasswordPrompter() ChangePasswordPrompter {
	prompter := NewTerminalPrompter()
	return changePasswordPrompter{prompter: prompter}
}

type changePasswordPrompter struct {
	prompter Prompter
}

func (c changePasswordPrompter) Prompt() (web.UpdatePasswordRequest, error) {
	fmt.Println("Changing your chainlink account password.")
	fmt.Println("NOTE: This will terminate any other sessions.")
	oldPassword := c.prompter.PasswordPrompt("Password:")

	fmt.Println("Now enter your **NEW** password")
	newPassword := c.prompter.PasswordPrompt("Password:")
	confirmPassword := c.prompter.PasswordPrompt("Confirmation:")

	if newPassword != confirmPassword {
		return web.UpdatePasswordRequest{}, errors.New("new password and confirmation did not match")
	}

	return web.UpdatePasswordRequest{
		OldPassword: oldPassword,
		NewPassword: newPassword,
	}, nil
}

// PasswordPrompter is an interface primarily used for DI to obtain a password
// from the User.
type PasswordPrompter interface {
	Prompt() string
}

// NewPasswordPrompter returns the production password change request prompter
func NewPasswordPrompter() PasswordPrompter {
	prompter := NewTerminalPrompter()
	return passwordPrompter{prompter: prompter}
}

type passwordPrompter struct {
	prompter Prompter
}

func (c passwordPrompter) Prompt() string {
	return c.prompter.PasswordPrompt("Password:")
}

func confirmAction(c *cli.Context) bool {
	if len(c.String("yes")) > 0 {
		yes, err := strconv.ParseBool(c.String("yes"))
		if err == nil && yes {
			return true
		}
	}

	prompt := NewTerminalPrompter()
	var answer string
	for {
		answer = prompt.Prompt("Are you sure? This action is irreversible! (yes/no) ")
		if answer == "yes" {
			return true
		} else if answer == "no" {
			return false
		}
		fmt.Printf("%s is not valid. Please type yes or no\n", answer)
	}
}