package main

import (
	"flag"
	"fmt"
	"net/http"
	"os"

	"github.com/facebookgo/httpdown"
	"github.com/jmhodges/clock"

	"github.com/letsencrypt/boulder/cmd"
	"github.com/letsencrypt/boulder/core"
	"github.com/letsencrypt/boulder/features"
	"github.com/letsencrypt/boulder/goodkey"
	bgrpc "github.com/letsencrypt/boulder/grpc"
	blog "github.com/letsencrypt/boulder/log"
	"github.com/letsencrypt/boulder/metrics"
	rapb "github.com/letsencrypt/boulder/ra/proto"
	"github.com/letsencrypt/boulder/rpc"
	"github.com/letsencrypt/boulder/wfe"
)

const clientName = "WFE"

type config struct {
	WFE struct {
		cmd.ServiceConfig
		BaseURL       string
		ListenAddress string

		AllowOrigins []string

		CertCacheDuration           cmd.ConfigDuration
		CertNoCacheExpirationWindow cmd.ConfigDuration
		IndexCacheDuration          cmd.ConfigDuration
		IssuerCacheDuration         cmd.ConfigDuration

		ShutdownStopTimeout cmd.ConfigDuration
		ShutdownKillTimeout cmd.ConfigDuration

		SubscriberAgreementURL string

		AcceptRevocationReason bool
		AllowAuthzDeactivation bool

		RAService *cmd.GRPCClientConfig

		Features map[string]bool
	}

	Statsd cmd.StatsdConfig

	SubscriberAgreementURL string

	Syslog cmd.SyslogConfig

	Common struct {
		BaseURL    string
		IssuerCert string
	}
}

func setupWFE(c config, logger blog.Logger, stats metrics.Scope) (core.RegistrationAuthority, *rpc.StorageAuthorityClient) {
	amqpConf := c.WFE.AMQP
	var rac core.RegistrationAuthority
	if c.WFE.RAService != nil {
		conn, err := bgrpc.ClientSetup(c.WFE.RAService, stats)
		cmd.FailOnError(err, "Failed to load credentials and create gRPC connection to RA")
		rac = bgrpc.NewRegistrationAuthorityClient(rapb.NewRegistrationAuthorityClient(conn), c.WFE.RAService.Timeout.Duration)
	} else {
		var err error
		rac, err = rpc.NewRegistrationAuthorityClient(clientName, amqpConf, stats)
		cmd.FailOnError(err, "Unable to create RA AMQP client")
	}

	sac, err := rpc.NewStorageAuthorityClient(clientName, amqpConf, stats)
	cmd.FailOnError(err, "Unable to create SA client")

	return rac, sac
}

func main() {
	configFile := flag.String("config", "", "File path to the configuration file for this service")
	flag.Parse()
	if *configFile == "" {
		flag.Usage()
		os.Exit(1)
	}

	var c config
	err := cmd.ReadConfigFile(*configFile, &c)
	cmd.FailOnError(err, "Reading JSON config file into config structure")

	err = features.Set(c.WFE.Features)
	cmd.FailOnError(err, "Failed to set feature flags")

	stats, logger := cmd.StatsAndLogging(c.Statsd, c.Syslog)
	scope := metrics.NewStatsdScope(stats, "WFE")
	defer logger.AuditPanic()
	logger.Info(cmd.VersionString(clientName))

	wfe, err := wfe.NewWebFrontEndImpl(scope, clock.Default(), goodkey.NewKeyPolicy(), logger)
	cmd.FailOnError(err, "Unable to create WFE")
	rac, sac := setupWFE(c, logger, scope)
	wfe.RA = rac
	wfe.SA = sac

	// TODO: remove this check once the production config uses the SubscriberAgreementURL in the wfe section
	if c.WFE.SubscriberAgreementURL != "" {
		wfe.SubscriberAgreementURL = c.WFE.SubscriberAgreementURL
	} else {
		wfe.SubscriberAgreementURL = c.SubscriberAgreementURL
	}

	wfe.AllowOrigins = c.WFE.AllowOrigins
	wfe.AcceptRevocationReason = c.WFE.AcceptRevocationReason
	wfe.AllowAuthzDeactivation = c.WFE.AllowAuthzDeactivation

	wfe.CertCacheDuration = c.WFE.CertCacheDuration.Duration
	wfe.CertNoCacheExpirationWindow = c.WFE.CertNoCacheExpirationWindow.Duration
	wfe.IndexCacheDuration = c.WFE.IndexCacheDuration.Duration
	wfe.IssuerCacheDuration = c.WFE.IssuerCacheDuration.Duration

	wfe.IssuerCert, err = cmd.LoadCert(c.Common.IssuerCert)
	cmd.FailOnError(err, fmt.Sprintf("Couldn't read issuer cert [%s]", c.Common.IssuerCert))

	logger.Info(fmt.Sprintf("WFE using key policy: %#v", goodkey.NewKeyPolicy()))

	// Set up paths
	wfe.BaseURL = c.Common.BaseURL
	h := wfe.Handler()

	httpMonitor := metrics.NewHTTPMonitor(scope, h)

	logger.Info(fmt.Sprintf("Server running, listening on %s...\n", c.WFE.ListenAddress))
	srv := &http.Server{
		Addr:    c.WFE.ListenAddress,
		Handler: httpMonitor,
	}

	go cmd.DebugServer(c.WFE.DebugAddr)
	go cmd.ProfileCmd(scope)

	hd := &httpdown.HTTP{
		StopTimeout: c.WFE.ShutdownStopTimeout.Duration,
		KillTimeout: c.WFE.ShutdownKillTimeout.Duration,
		Stats:       metrics.NewFBAdapter(scope, clock.Default()),
	}
	hdSrv, err := hd.ListenAndServe(srv)
	cmd.FailOnError(err, "Error starting HTTP server")

	go cmd.CatchSignals(logger, func() { _ = hdSrv.Stop() })

	forever := make(chan struct{}, 1)
	<-forever
}