package notmain

import (
	"context"
	"flag"
	"os"
	"time"

	"github.com/jmhodges/clock"

	capb "github.com/letsencrypt/boulder/ca/proto"
	"github.com/letsencrypt/boulder/cmd"
	"github.com/letsencrypt/boulder/config"
	"github.com/letsencrypt/boulder/ctpolicy"
	"github.com/letsencrypt/boulder/ctpolicy/ctconfig"
	"github.com/letsencrypt/boulder/ctpolicy/loglist"
	"github.com/letsencrypt/boulder/features"
	"github.com/letsencrypt/boulder/goodkey"
	"github.com/letsencrypt/boulder/goodkey/sagoodkey"
	bgrpc "github.com/letsencrypt/boulder/grpc"
	"github.com/letsencrypt/boulder/issuance"
	"github.com/letsencrypt/boulder/policy"
	pubpb "github.com/letsencrypt/boulder/publisher/proto"
	"github.com/letsencrypt/boulder/ra"
	rapb "github.com/letsencrypt/boulder/ra/proto"
	"github.com/letsencrypt/boulder/ratelimits"
	bredis "github.com/letsencrypt/boulder/redis"
	sapb "github.com/letsencrypt/boulder/sa/proto"
	"github.com/letsencrypt/boulder/va"
	vapb "github.com/letsencrypt/boulder/va/proto"
)

type Config struct {
	RA struct {
		cmd.ServiceConfig
		cmd.HostnamePolicyConfig

		// RateLimitPoliciesFilename is deprecated.
		RateLimitPoliciesFilename string

		MaxContactsPerRegistration int

		SAService        *cmd.GRPCClientConfig
		VAService        *cmd.GRPCClientConfig
		CAService        *cmd.GRPCClientConfig
		PublisherService *cmd.GRPCClientConfig

		// Deprecated: TODO(#8349): Remove this when removing the corresponding
		// service from the CA.
		OCSPService *cmd.GRPCClientConfig

		Limiter struct {
			// Redis contains the configuration necessary to connect to Redis
			// for rate limiting. This field is required to enable rate
			// limiting.
			Redis *bredis.Config `validate:"required_with=Defaults"`

			// Defaults is a path to a YAML file containing default rate limits.
			// See: ratelimits/README.md for details. This field is required to
			// enable rate limiting. If any individual rate limit is not set,
			// that limit will be disabled. Limits passed in this file must be
			// identical to those in the WFE.
			//
			// Note: At this time, only the Failed Authorizations rate limit is
			// necessary in the RA.
			Defaults string `validate:"required_with=Redis"`

			// Overrides is a path to a YAML file containing overrides for the
			// default rate limits. See: ratelimits/README.md for details. If
			// neither this field nor OverridesFromDB is set, all requesters
			// will be subject to the default rate limits. Overrides passed in
			// this file must be identical to those in the WFE.
			//
			// Note: At this time, only the Failed Authorizations overrides are
			// necessary in the RA.
			Overrides string

			// OverridesFromDB causes the WFE and RA to retrieve rate limit overrides
			// from the database, instead of from a file.
			OverridesFromDB bool
		}

		// MaxNames is the maximum number of subjectAltNames in a single cert.
		// The value supplied MUST be greater than 0 and no more than 100. These
		// limits are per section 7.1 of our combined CP/CPS, under "DV-SSL
		// Subscriber Certificate". The value must match the CA and WFE
		// configurations.
		//
		// Deprecated: Set ValidationProfiles[*].MaxNames instead.
		MaxNames int `validate:"omitempty,min=1,max=100"`

		// ValidationProfiles is a map of validation profiles to their
		// respective issuance allow lists. If a profile is not included in this
		// mapping, it cannot be used by any account. If this field is left
		// empty, all profiles are open to all accounts.
		ValidationProfiles map[string]*ra.ValidationProfileConfig `validate:"required"`

		// DefaultProfileName sets the profile to use if one wasn't provided by the
		// client in the new-order request. Must match a configured validation
		// profile or the RA will fail to start. Must match a certificate profile
		// configured in the CA or finalization will fail for orders using this
		// default.
		DefaultProfileName string `validate:"required"`

		// GoodKey is an embedded config stanza for the goodkey library.
		GoodKey goodkey.Config

		// FinalizeTimeout is how long the RA is willing to wait for the Order
		// finalization process to take. This config parameter only has an effect
		// if the AsyncFinalization feature flag is enabled. Any systems which
		// manage the shutdown of an RA must be willing to wait at least this long
		// after sending the shutdown signal, to allow background goroutines to
		// complete.
		FinalizeTimeout config.Duration `validate:"-"`

		// CTLogs contains groupings of CT logs organized by what organization
		// operates them. When we submit precerts to logs in order to get SCTs, we
		// will submit the cert to one randomly-chosen log from each group, and use
		// the SCTs from the first two groups which reply. This allows us to comply
		// with various CT policies that require (for certs with short lifetimes
		// like ours) two SCTs from logs run by different operators. It also holds
		// a `Stagger` value controlling how long we wait for one operator group
		// to respond before trying a different one.
		CTLogs ctconfig.CTConfig

		// IssuerCerts are paths to all intermediate certificates which may have
		// been used to issue certificates in the last 90 days. These are used to
		// generate OCSP URLs to purge during revocation.
		IssuerCerts []string `validate:"min=1,dive,required"`

		Features features.Config
	}

	PA cmd.PAConfig

	Syslog        cmd.SyslogConfig
	OpenTelemetry cmd.OpenTelemetryConfig
}

func main() {
	grpcAddr := flag.String("addr", "", "gRPC listen address override")
	debugAddr := flag.String("debug-addr", "", "Debug server address override")
	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")

	features.Set(c.RA.Features)

	if *grpcAddr != "" {
		c.RA.GRPC.Address = *grpcAddr
	}
	if *debugAddr != "" {
		c.RA.DebugAddr = *debugAddr
	}

	scope, logger, oTelShutdown := cmd.StatsAndLogging(c.Syslog, c.OpenTelemetry, c.RA.DebugAddr)
	defer oTelShutdown(context.Background())
	cmd.LogStartup(logger)

	// Validate PA config and set defaults if needed
	cmd.FailOnError(c.PA.CheckChallenges(), "Invalid PA configuration")
	cmd.FailOnError(c.PA.CheckIdentifiers(), "Invalid PA configuration")

	pa, err := policy.New(c.PA.Identifiers, c.PA.Challenges, logger)
	cmd.FailOnError(err, "Couldn't create PA")

	if c.RA.HostnamePolicyFile == "" {
		cmd.Fail("HostnamePolicyFile must be provided.")
	}
	err = pa.LoadIdentPolicyFile(c.RA.HostnamePolicyFile)
	cmd.FailOnError(err, "Couldn't load identifier policy file")

	tlsConfig, err := c.RA.TLS.Load(scope)
	cmd.FailOnError(err, "TLS config")

	clk := clock.New()

	vaConn, err := bgrpc.ClientSetup(c.RA.VAService, tlsConfig, scope, clk)
	cmd.FailOnError(err, "Unable to create VA client")
	vac := vapb.NewVAClient(vaConn)
	caaClient := vapb.NewCAAClient(vaConn)

	caConn, err := bgrpc.ClientSetup(c.RA.CAService, tlsConfig, scope, clk)
	cmd.FailOnError(err, "Unable to create CA client")
	cac := capb.NewCertificateAuthorityClient(caConn)

	saConn, err := bgrpc.ClientSetup(c.RA.SAService, tlsConfig, scope, clk)
	cmd.FailOnError(err, "Failed to load credentials and create gRPC connection to SA")
	sac := sapb.NewStorageAuthorityClient(saConn)

	conn, err := bgrpc.ClientSetup(c.RA.PublisherService, tlsConfig, scope, clk)
	cmd.FailOnError(err, "Failed to load credentials and create gRPC connection to Publisher")
	pubc := pubpb.NewPublisherClient(conn)

	issuerCertPaths := c.RA.IssuerCerts
	issuerCerts := make([]*issuance.Certificate, len(issuerCertPaths))
	for i, issuerCertPath := range issuerCertPaths {
		issuerCerts[i], err = issuance.LoadCertificate(issuerCertPath)
		cmd.FailOnError(err, "Failed to load issuer certificate")
	}

	// Boulder's components assume that there will always be CT logs configured.
	// Issuing a certificate without SCTs embedded is a misissuance event as per
	// our CPS 4.4.2, which declares we will always include at least two SCTs.
	// Exit early if no groups are configured.
	var ctp *ctpolicy.CTPolicy
	if len(c.RA.CTLogs.SCTLogs) <= 0 {
		cmd.Fail("Must configure CTLogs")
	}

	allLogs, err := loglist.New(c.RA.CTLogs.LogListFile)
	cmd.FailOnError(err, "Failed to parse log list")

	sctLogs, err := allLogs.SubsetForPurpose(c.RA.CTLogs.SCTLogs, loglist.Issuance, c.RA.CTLogs.SubmitToTestLogs)
	cmd.FailOnError(err, "Failed to load SCT logs")

	infoLogs, err := allLogs.SubsetForPurpose(c.RA.CTLogs.InfoLogs, loglist.Informational, true)
	cmd.FailOnError(err, "Failed to load informational logs")

	finalLogs, err := allLogs.SubsetForPurpose(c.RA.CTLogs.FinalLogs, loglist.Informational, true)
	cmd.FailOnError(err, "Failed to load final logs")

	ctp = ctpolicy.New(pubc, sctLogs, infoLogs, finalLogs, c.RA.CTLogs.Stagger.Duration, logger, scope)

	if len(c.RA.ValidationProfiles) == 0 {
		cmd.Fail("At least one profile must be configured")
	}

	// TODO(#7993): Remove this fallback and make ValidationProfile.MaxNames a
	// required config field. We don't do any validation on the value of this
	// top-level MaxNames because that happens inside the call to
	// NewValidationProfiles below.
	for _, pc := range c.RA.ValidationProfiles {
		if pc.MaxNames == 0 {
			pc.MaxNames = c.RA.MaxNames
		}
	}

	validationProfiles, err := ra.NewValidationProfiles(c.RA.DefaultProfileName, c.RA.ValidationProfiles)
	cmd.FailOnError(err, "Failed to load validation profiles")

	if features.Get().AsyncFinalize && c.RA.FinalizeTimeout.Duration == 0 {
		cmd.Fail("finalizeTimeout must be supplied when AsyncFinalize feature is enabled")
	}

	kp, err := sagoodkey.NewPolicy(&c.RA.GoodKey, sac.KeyBlocked)
	cmd.FailOnError(err, "Unable to create key policy")

	var limiter *ratelimits.Limiter
	var txnBuilder *ratelimits.TransactionBuilder
	var limiterRedis *bredis.Ring
	if c.RA.Limiter.Defaults != "" {
		// Setup rate limiting.
		limiterRedis, err = bredis.NewRingFromConfig(*c.RA.Limiter.Redis, scope, logger)
		cmd.FailOnError(err, "Failed to create Redis ring")

		source := ratelimits.NewRedisSource(limiterRedis.Ring, clk, scope)
		limiter, err = ratelimits.NewLimiter(clk, source, scope)
		cmd.FailOnError(err, "Failed to create rate limiter")
		if c.RA.Limiter.OverridesFromDB {
			if c.RA.Limiter.Overrides != "" {
				cmd.Fail("OverridesFromDB and an overrides file were both defined, but are mutually exclusive")
			}
			saroc := sapb.NewStorageAuthorityReadOnlyClient(saConn)
			txnBuilder, err = ratelimits.NewTransactionBuilderFromDatabase(c.RA.Limiter.Defaults, saroc.GetEnabledRateLimitOverrides, scope, logger)
		} else {
			txnBuilder, err = ratelimits.NewTransactionBuilderFromFiles(c.RA.Limiter.Defaults, c.RA.Limiter.Overrides, scope, logger)
		}
		cmd.FailOnError(err, "Failed to create rate limits transaction builder")

		// The 30 minute period here must be kept in sync with the promise
		// (successCommentBody) made to requesters in sfe/overridesimporter.go
		overrideRefresherShutdown := txnBuilder.NewRefresher(30 * time.Minute)
		defer overrideRefresherShutdown()
	}

	rai := ra.NewRegistrationAuthorityImpl(
		clk,
		logger,
		scope,
		c.RA.MaxContactsPerRegistration,
		kp,
		limiter,
		txnBuilder,
		c.RA.MaxNames,
		validationProfiles,
		pubc,
		c.RA.FinalizeTimeout.Duration,
		ctp,
		issuerCerts,
	)
	defer rai.Drain()

	rai.PA = pa

	rai.VA = va.RemoteClients{
		VAClient:  vac,
		CAAClient: caaClient,
	}
	rai.CA = cac
	rai.SA = sac

	start, err := bgrpc.NewServer(c.RA.GRPC, logger).Add(
		&rapb.RegistrationAuthority_ServiceDesc, rai).Add(
		&rapb.SCTProvider_ServiceDesc, rai).
		Build(tlsConfig, scope, clk)
	cmd.FailOnError(err, "Unable to setup RA gRPC server")

	cmd.FailOnError(start(), "RA gRPC service failed")
}

func init() {
	cmd.RegisterCommand("boulder-ra", main, &cmd.ConfigValidator{Config: &Config{}})
}
