package command

import (
	"context"
	"time"

	"github.com/caos/zitadel/internal/api/authz"
	authz_repo "github.com/caos/zitadel/internal/authz/repository/eventsourcing"
	"github.com/caos/zitadel/internal/config/types"
	"github.com/caos/zitadel/internal/domain"
	"github.com/caos/zitadel/internal/eventstore"

	"github.com/caos/zitadel/internal/api/http"
	sd "github.com/caos/zitadel/internal/config/systemdefaults"
	"github.com/caos/zitadel/internal/crypto"
	"github.com/caos/zitadel/internal/id"
	iam_repo "github.com/caos/zitadel/internal/repository/iam"
	"github.com/caos/zitadel/internal/repository/keypair"
	"github.com/caos/zitadel/internal/repository/org"
	proj_repo "github.com/caos/zitadel/internal/repository/project"
	usr_repo "github.com/caos/zitadel/internal/repository/user"
	usr_grant_repo "github.com/caos/zitadel/internal/repository/usergrant"
	"github.com/caos/zitadel/internal/static"
	"github.com/caos/zitadel/internal/telemetry/tracing"
	webauthn_helper "github.com/caos/zitadel/internal/webauthn"
)

type Commands struct {
	eventstore   *eventstore.Eventstore
	static       static.Storage
	idGenerator  id.Generator
	iamDomain    string
	zitadelRoles []authz.RoleMapping

	idpConfigSecretCrypto crypto.EncryptionAlgorithm

	userPasswordAlg             crypto.HashAlgorithm
	initializeUserCode          crypto.Generator
	emailVerificationCode       crypto.Generator
	phoneVerificationCode       crypto.Generator
	passwordVerificationCode    crypto.Generator
	machineKeyAlg               crypto.EncryptionAlgorithm
	machineKeySize              int
	applicationKeySize          int
	applicationSecretGenerator  crypto.Generator
	domainVerificationAlg       crypto.EncryptionAlgorithm
	domainVerificationGenerator crypto.Generator
	domainVerificationValidator func(domain, token, verifier string, checkType http.CheckType) error
	multifactors                domain.MultifactorConfigs

	webauthn           *webauthn_helper.WebAuthN
	keySize            int
	keyAlgorithm       crypto.EncryptionAlgorithm
	privateKeyLifetime time.Duration
	publicKeyLifetime  time.Duration
	tokenVerifier      *authz.TokenVerifier
}

type Config struct {
	Eventstore types.SQLUser
}

func StartCommands(eventstore *eventstore.Eventstore, defaults sd.SystemDefaults, authZConfig authz.Config, staticStore static.Storage, authZRepo *authz_repo.EsRepository) (repo *Commands, err error) {
	repo = &Commands{
		eventstore:         eventstore,
		static:             staticStore,
		idGenerator:        id.SonyFlakeGenerator,
		iamDomain:          defaults.Domain,
		zitadelRoles:       authZConfig.RolePermissionMappings,
		keySize:            defaults.KeyConfig.Size,
		privateKeyLifetime: defaults.KeyConfig.PrivateKeyLifetime.Duration,
		publicKeyLifetime:  defaults.KeyConfig.PublicKeyLifetime.Duration,
	}
	iam_repo.RegisterEventMappers(repo.eventstore)
	org.RegisterEventMappers(repo.eventstore)
	usr_repo.RegisterEventMappers(repo.eventstore)
	usr_grant_repo.RegisterEventMappers(repo.eventstore)
	proj_repo.RegisterEventMappers(repo.eventstore)
	keypair.RegisterEventMappers(repo.eventstore)

	repo.idpConfigSecretCrypto, err = crypto.NewAESCrypto(defaults.IDPConfigVerificationKey)
	if err != nil {
		return nil, err
	}
	userEncryptionAlgorithm, err := crypto.NewAESCrypto(defaults.UserVerificationKey)
	if err != nil {
		return nil, err
	}
	repo.initializeUserCode = crypto.NewEncryptionGenerator(defaults.SecretGenerators.InitializeUserCode, userEncryptionAlgorithm)
	repo.emailVerificationCode = crypto.NewEncryptionGenerator(defaults.SecretGenerators.EmailVerificationCode, userEncryptionAlgorithm)
	repo.phoneVerificationCode = crypto.NewEncryptionGenerator(defaults.SecretGenerators.PhoneVerificationCode, userEncryptionAlgorithm)
	repo.passwordVerificationCode = crypto.NewEncryptionGenerator(defaults.SecretGenerators.PasswordVerificationCode, userEncryptionAlgorithm)
	repo.userPasswordAlg = crypto.NewBCrypt(defaults.SecretGenerators.PasswordSaltCost)
	repo.machineKeyAlg = userEncryptionAlgorithm
	repo.machineKeySize = int(defaults.SecretGenerators.MachineKeySize)
	repo.applicationKeySize = int(defaults.SecretGenerators.ApplicationKeySize)

	aesOTPCrypto, err := crypto.NewAESCrypto(defaults.Multifactors.OTP.VerificationKey)
	if err != nil {
		return nil, err
	}
	repo.multifactors = domain.MultifactorConfigs{
		OTP: domain.OTPConfig{
			CryptoMFA: aesOTPCrypto,
			Issuer:    defaults.Multifactors.OTP.Issuer,
		},
	}
	passwordAlg := crypto.NewBCrypt(defaults.SecretGenerators.PasswordSaltCost)
	repo.applicationSecretGenerator = crypto.NewHashGenerator(defaults.SecretGenerators.ClientSecretGenerator, passwordAlg)

	repo.domainVerificationAlg, err = crypto.NewAESCrypto(defaults.DomainVerification.VerificationKey)
	if err != nil {
		return nil, err
	}
	repo.domainVerificationGenerator = crypto.NewEncryptionGenerator(defaults.DomainVerification.VerificationGenerator, repo.domainVerificationAlg)
	repo.domainVerificationValidator = http.ValidateDomain
	web, err := webauthn_helper.StartServer(defaults.WebAuthN)
	if err != nil {
		return nil, err
	}
	repo.webauthn = web

	keyAlgorithm, err := crypto.NewAESCrypto(defaults.KeyConfig.EncryptionConfig)
	if err != nil {
		return nil, err
	}
	repo.keyAlgorithm = keyAlgorithm

	repo.tokenVerifier = authz.Start(authZRepo)
	return repo, nil
}

func (c *Commands) getIAMWriteModel(ctx context.Context) (_ *IAMWriteModel, err error) {
	ctx, span := tracing.NewSpan(ctx)
	defer func() { span.EndWithError(err) }()

	writeModel := NewIAMWriteModel()
	err = c.eventstore.FilterToQueryReducer(ctx, writeModel)
	if err != nil {
		return nil, err
	}

	return writeModel, nil
}

func AppendAndReduce(object interface {
	AppendEvents(...eventstore.EventReader)
	Reduce() error
}, events ...eventstore.EventReader) error {
	object.AppendEvents(events...)
	return object.Reduce()
}