package core

import (
	"context"
	"crypto/rsa"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"math/big"
	"net"
	"net/http"
	"os"
	"strings"
	"sync/atomic"
	"text/template"
	"time"
	"unsafe"

	"repositories.action2quare.com/ayo/gocommon"
	"repositories.action2quare.com/ayo/gocommon/flagx"
	"repositories.action2quare.com/ayo/gocommon/logger"
	"repositories.action2quare.com/ayo/gocommon/session"

	"github.com/golang-jwt/jwt"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo/options"

	firebase "firebase.google.com/go"
	"firebase.google.com/go/auth"

	"google.golang.org/api/option"
)

var devflag = flagx.Bool("dev", false, "")
var noauth = flagx.Bool("noauth", false, "")
var authtype = flagx.String("auth", "on", "on|off|both")

var (
	CollectionLink               = gocommon.CollectionName("link")
	CollectionWhitelist          = gocommon.CollectionName("whitelist")
	CollectionService            = gocommon.CollectionName("service")
	CollectionAccount            = gocommon.CollectionName("account")
	CollectionFile               = gocommon.CollectionName("file")
	CollectionBlock              = gocommon.CollectionName("block")
	CollectionPlatformLoginToken = gocommon.CollectionName("platform_login_token") //-- 각 플랫폼에 로그인 및 권한 받아오는 과정에 사용하는 Key
	CollectionUserToken          = gocommon.CollectionName("usertoken")
	CollectionGamepotUserInfo    = gocommon.CollectionName("gamepot_userinfo")  //-- 클라로부터 수집된 gamepot 정보 - server to server로 유효성이 검증되진 않았지만 수집은 한다.
	CollectionFirebaseUserInfo   = gocommon.CollectionName("firebase_userinfo") //-- Firebase UserInfo
)

const (
	AuthPlatformSteamSDK     = "steam"
	AuthPlatformFirebaseAuth = "firebase"
	AuthPlatformGoogle       = "google"
	AuthPlatformMicrosoft    = "microsoft"
	AuthPlatformApple        = "apple"
	AuthPlatformTwitter      = "twitter"
	AuthPlatformHybeim       = "hybeim"
)

const (
	sessionTTL    = time.Hour
	sessionTTLDev = 1 * time.Hour
)

func SessionTTL() time.Duration {
	if *devflag {
		return sessionTTLDev
	}

	return sessionTTL
}

type maingateConfig struct {
	session.SessionConfig          `json:",inline"`
	MustUseChecksum                bool   `json:"maingate_must_checksum"`
	Mongo                          string `json:"maingate_mongodb_url"`
	Autologin_ttl                  int64  `json:"autologin_ttl"`
	AccDelTTL                      int64  `json:"acc_del_ttl"`
	MaximumNumLinkAccount          int64  `json:"maximum_num_link_account"`
	RedirectBaseUrl                string `json:"redirect_base_url"`
	GoogleClientId                 string `json:"google_client_id"`
	GoogleClientSecret             string `json:"google_client_secret"`
	TwitterOAuthKey                string `json:"twitter_oauth_key"`
	TwitterOAuthSecret             string `json:"twitter_oauth_secret"`
	TwitterCustomerKey             string `json:"twitter_customer_key"`
	TwitterCustomerSecret          string `json:"twitter_customer_secret"`
	AppleCientId                   string `json:"apple_client_id"`
	ApplePrivateKey                string `json:"apple_privatekey"`
	AppleServiceId                 string `json:"apple_service_id"`
	AppleTeamId                    string `json:"apple_team_id"`
	AppleKeyId                     string `json:"apple_key_id"`
	MicrosoftClientId              string `json:"microsoft_client_id"`
	MicrosoftClientSecret          string `json:"microsoft_client_secret"`
	GamepotProjectId               string `json:"gamepot_project_id"`
	GamepotLoginCheckAPIURL        string `json:"gamepot_logincheckapi_url"`
	FirebaseAdminSDKCredentialFile string `json:"firebase_admin_sdk_credentialfile"`
	SteamAppId                     string `json:"steam_app_id"`
	SteamPublisherAuthKey          string `json:"steam_publisher_authkey"`
	GlobalMaingateToken            string `json:"maingate_api_token"`
	HybeImProjectIdstring          string `json:"hybeim_projectid"`
	HybeImServiceIdstring          string `json:"hybeim_serviceid"`
	HybeImAccessKey                string `json:"hybeim_acesskey"`
	HybeImEndPoint                 string `json:"hybeim_Endpoint"`

	Firebase_Google_Analytics_JS_SDK_Config
}

type Firebase_Google_Analytics_JS_SDK_Config struct {
	FGA_apiKey            string `json:"firebase_google_analytics_jssdk_apikey"`
	FGA_authDomain        string `json:"firebase_google_analytics_jssdk_authdomain"`
	FGA_databaseURL       string `json:"firebase_google_analytics_jssdk_databaseurl"`
	FGA_projectId         string `json:"firebase_google_analytics_jssdk_projectid"`
	FGA_storageBucket     string `json:"firebase_google_analytics_jssdk_storagebucket"`
	FGA_messagingSenderId string `json:"firebase_google_analytics_jssdk_messagingsenderid"`
	FGA_appId             string `json:"firebase_google_analytics_jssdk_apiid"`
	FGA_measurementId     string `json:"ffirebase_google_analytics_jssdk_measurementid"`
}

type globalAdmins struct {
	Admins  []string `json:"maingate_global_admins"`
	emails  map[string]bool
	modtime time.Time
}

func (ga *globalAdmins) parse() {
	parsed := make(map[string]bool)
	for _, admin := range ga.Admins {
		parsed[admin] = true
	}
	ga.emails = parsed
	ga.modtime = gocommon.ConfigModTime()
}

type firebaseClient struct {
	firebaseAppClient  *auth.Client
	firebaseAppContext context.Context
}

// Maingate :
type Maingate struct {
	mongoClient gocommon.MongoClient

	sessionProvider session.Provider
	//services               servicelist
	serviceptr unsafe.Pointer
	admins     unsafe.Pointer
	wl         memberContainerPtr[string, *whitelistmember]
	bl         memberContainerPtr[primitive.ObjectID, *blockinfo]

	tokenEndpoints         map[string]string
	authorizationEndpoints map[string]string
	userinfoEndpoint       map[string]string
	jwksUri                map[string]string

	firebase *firebaseClient
}

var config maingateConfig

// New :
func New(ctx context.Context) (*Maingate, error) {
	if err := gocommon.LoadConfig(&config); err != nil {
		return nil, err
	}

	var admins globalAdmins
	if err := gocommon.LoadConfig(&admins); err == nil {
		admins.parse()
	}

	if len(config.SessionStorage) == 0 {
		return nil, errors.New("maingate_session_storage is missing")
	}

	if config.SessionTTL == 0 {
		config.SessionTTL = 3600
	}

	mg := Maingate{
		admins:                 unsafe.Pointer(&admins),
		tokenEndpoints:         make(map[string]string),
		authorizationEndpoints: make(map[string]string),
		userinfoEndpoint:       make(map[string]string),
		jwksUri:                make(map[string]string),
	}

	err := mg.prepare(ctx)
	if err != nil {
		return nil, err
	}

	if len(*authtype) == 0 {
		*authtype = "on"
	}

	if !*noauth && (*authtype == "on" || *authtype == "both") {
		if len(config.FirebaseAdminSDKCredentialFile) > 0 {
			opt := option.WithCredentialsFile(config.FirebaseAdminSDKCredentialFile)
			firebaseApp, err := firebase.NewApp(context.Background(), nil, opt)
			if err != nil {
				logger.Error("firebase admin error initializing app failed :", err)
				return nil, err
			}

			firebaseAppClient, err := firebaseApp.Auth(ctx)
			if err != nil {
				logger.Println("FirebaseAppClient error getting Auth client:", err)
				return nil, err
			}

			mg.firebase = &firebaseClient{
				firebaseAppContext: ctx,
				firebaseAppClient:  firebaseAppClient,
			}
		}
	}

	return &mg, nil
}

func (mg *Maingate) service() *serviceDescription {
	valptr := atomic.LoadPointer(&mg.serviceptr)
	return (*serviceDescription)(valptr)
}

func (mg *Maingate) Destructor() {
	logger.Println("maingate.Destructor")
	mg.mongoClient.Close()
}

func (mg *Maingate) discoverOpenIdConfiguration(name string, url string) error {
	// microsoft open-id configuration
	discover, err := http.Get(url)
	if err != nil {
		return err
	}
	defer discover.Body.Close()
	body, err := io.ReadAll(discover.Body)
	if err != nil {
		return err
	}
	var endpoints map[string]any
	if err := json.Unmarshal(body, &endpoints); err != nil {
		return err
	}

	if tokenEndpoint, ok := endpoints["token_endpoint"].(string); ok {
		mg.tokenEndpoints[name] = tokenEndpoint
		if !ok {
			return fmt.Errorf("token_endpoint is missing. %s %s", name, url)
		}
	}

	if authorizationEndpoint, ok := endpoints["authorization_endpoint"].(string); ok {
		mg.authorizationEndpoints[name] = authorizationEndpoint
		if !ok {
			return fmt.Errorf("authorization_endpoint is missing. %s %s", name, url)
		}
	}

	if userinfoEndpoint, ok := endpoints["userinfo_endpoint"].(string); ok {
		mg.userinfoEndpoint[name] = userinfoEndpoint
		if !ok {
			return fmt.Errorf("userinfo_endpoint is missing. %s %s", name, url)
		}
	}

	if jwksUri, ok := endpoints["jwks_uri"].(string); ok {
		mg.jwksUri[name] = jwksUri
		if !ok {
			return fmt.Errorf("jwks_uri is missing. %s %s", name, url)
		}
	}

	return nil

}

func (mg *Maingate) prepare(context context.Context) (err error) {
	if err := mg.discoverOpenIdConfiguration(AuthPlatformMicrosoft, "https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration"); err != nil {
		return logger.ErrorWithCallStack(err)
	}
	if err := mg.discoverOpenIdConfiguration("google", "https://accounts.google.com/.well-known/openid-configuration"); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	// redis에서 env를 가져온 후에
	mg.mongoClient, err = gocommon.NewMongoClient(context, config.Mongo)
	if err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionCouponUse, map[string]bson.D{
		"idrounds": {{Key: "_id", Value: 1}, {Key: "rounds", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionLink, map[string]bson.D{
		"platformuid": {{Key: "platform", Value: 1}, {Key: "uid", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionLink, map[string]bson.D{
		"emailplatform": {{Key: "email", Value: 1}, {Key: "platform", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeIndices(CollectionAccount, map[string]bson.D{
		"accid": {{Key: "accid", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionFile, map[string]bson.D{
		"keyonly": {{Key: "key", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeExpireIndex(CollectionAccount, int32(config.AccDelTTL)); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeExpireIndex(CollectionLink, int32(config.AccDelTTL)); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	// Delete대신 _ts로 expire시킴. pipeline에 삭제 알려주기 위함
	if err = mg.mongoClient.MakeExpireIndex(CollectionWhitelist, 10); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if *devflag {
		// 에러 체크하지 말것
		mg.mongoClient.DropIndex(CollectionBlock, "codeaccid")
	}

	if err = mg.mongoClient.MakeExpireIndex(CollectionBlock, int32(3)); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionPlatformLoginToken, map[string]bson.D{
		"platformauthtoken": {{Key: "platform", Value: 1}, {Key: "key", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeExpireIndex(CollectionPlatformLoginToken, int32(config.SessionTTL+300)); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionUserToken, map[string]bson.D{
		"platformusertoken": {{Key: "platform", Value: 1}, {Key: "userid", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionGamepotUserInfo, map[string]bson.D{
		"gamepotuserid": {{Key: "gamepotuserid", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if err = mg.mongoClient.MakeUniqueIndices(CollectionFirebaseUserInfo, map[string]bson.D{
		"firebaseuserid": {{Key: "firebaseuserid", Value: 1}},
	}); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	mg.sessionProvider, err = session.NewProviderWithConfig(context, config.SessionConfig)
	if err != nil {
		return logger.ErrorWithCallStack(err)
	}

	var preall []struct {
		Link string             `bson:"link"`
		Id   primitive.ObjectID `bson:"_id"`
	}
	if err = mg.mongoClient.FindAllAs(CollectionFile, nil, &preall, options.Find().SetProjection(bson.M{
		"link": 1,
	})); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	for _, pre := range preall {
		_, err := os.Stat(pre.Link)
		if !os.IsNotExist(err) {
			continue
		}
		logger.Println("saving files :", pre.Link)

		var fulldoc FileDocumentDesc
		err = mg.mongoClient.FindOneAs(CollectionFile, bson.M{
			"_id": pre.Id,
		}, &fulldoc)
		if err != nil {
			return logger.ErrorWithCallStack(err)
		}
		err = fulldoc.Save()
		if err != nil {
			return logger.ErrorWithCallStack(err)
		}
	}

	var whites []*whitelistmember
	if err := mg.mongoClient.AllAs(CollectionWhitelist, &whites, options.Find().SetReturnKey(false)); err != nil {
		return logger.ErrorWithCallStack(err)
	}
	mg.wl.init(whites)

	var blocks []*blockinfo
	if err := mg.mongoClient.AllAs(CollectionBlock, &blocks); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	logger.Println("allblocks :", blocks)
	mg.bl.init(blocks)

	go mg.wl.watchCollection(context, CollectionWhitelist, mg.mongoClient)
	go mg.bl.watchCollection(context, CollectionBlock, mg.mongoClient)

	return nil
}

var portptr = flagx.Int("port", 80, "")

func (mg *Maingate) RegisterHandlers(ctx context.Context, serveMux *http.ServeMux, prefix string) error {
	var allServices []*serviceDescription
	if err := mg.mongoClient.AllAs(CollectionService, &allServices, options.Find().SetReturnKey(false)); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	if len(allServices) > 0 {
		only := allServices[0]
		only.prepare(mg)
		only.mustUseChecksum = config.MustUseChecksum

		atomic.StorePointer(&mg.serviceptr, unsafe.Pointer(only))
	} else {
		empty := serviceDescription{
			Id: primitive.NewObjectID(),
		}

		if *devflag {
			addrs, err := net.InterfaceAddrs()
			if err != nil {
				return logger.ErrorWithCallStack(err)
			}
			ipaddr := "127.0.0.1"
			for _, addr := range addrs {
				if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
					if ipnet.IP.To4() != nil && ipnet.IP.IsPrivate() {
						ipaddr = ipnet.IP.String()
					}
				}
			}

			empty.Divisions = map[string]*Division{
				"default": {
					DivisionForUser: DivisionForUser{
						Priority: 0,
						State:    DivisionState_FullOpen,
					},

					Urls: bson.M{
						"warehouse": fmt.Sprintf("http://%s:%d/warehouse", ipaddr, *portptr),
					},
				},
			}
		}

		empty.prepare(mg)
		atomic.StorePointer(&mg.serviceptr, unsafe.Pointer(&empty))

		filter := bson.M{"_id": empty.Id}
		_, _, err := mg.mongoClient.Update(CollectionService, filter, bson.M{
			"$set": &empty,
		}, options.Update().SetUpsert(true))

		if err != nil {
			return logger.ErrorWithCallStack(err)
		}
	}

	if *devflag {
		serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "/"), func(w http.ResponseWriter, r *http.Request) {
			// mg.service()를 요청마다 불러야 함
			mg.service().serveHTTP_dev(w, r)
		})
	} else {
		pattern := gocommon.MakeHttpHandlerPattern(prefix, "/")
		logger.Println("pattern registered :", pattern)
		serveMux.HandleFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
			// mg.service()를 요청마다 불러야 함
			mg.service().serveHTTP(w, r)
		})
	}
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "api/"), mg.api)

	configraw, _ := json.Marshal(config)
	var convertedConfig map[string]any
	if err := json.Unmarshal(configraw, &convertedConfig); err != nil {
		return logger.ErrorWithCallStack(err)
	}

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "config"), func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			s := recover()
			if s != nil {
				logger.Error(s)
			}
		}()

		if !*devflag {
			apitoken := r.Header.Get("MG-X-API-TOKEN")
			if len(apitoken) == 0 {
				logger.Println("MG-X-API-TOKEN is missing")
				w.WriteHeader(http.StatusBadRequest)
				return
			}

			apitokenObj, _ := primitive.ObjectIDFromHex(apitoken)
			if mg.service().isValidToken(apitokenObj) {
				convertedConfig["divisions"] = mg.service().Divisions
			}
		} else {
			convertedConfig["divisions"] = mg.service().Divisions
		}

		enc := json.NewEncoder(w)
		enc.Encode(convertedConfig)
	})

	if err := os.MkdirAll("static", os.ModePerm); err != nil {
		// 일반 엔드유저한테 오픈할 static 페이지
		return logger.ErrorWithCallStack(err)
	}

	cfsx := http.FileServer(http.Dir("console"))
	pattern := gocommon.MakeHttpHandlerPattern(prefix, "console", "/")
	serveMux.Handle(pattern, http.StripPrefix(pattern, cfsx))
	logger.Println("maingate console registered :", pattern)

	staticfs := http.FileServer(http.Dir("static"))
	pattern = gocommon.MakeHttpHandlerPattern(prefix, "static", "/")
	serveMux.Handle(pattern, http.StripPrefix(pattern, staticfs))
	logger.Println("maingate static registered :", pattern)

	fbafs := http.FileServer(http.Dir("fba"))
	pattern = gocommon.MakeHttpHandlerPattern(prefix, "fba", "/")
	serveMux.Handle(pattern, http.StripPrefix(pattern, fbafs))
	logger.Println("google_analytics static registered :", pattern)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "fba", "fb-ga.min.js"), mg.google_analytics_js)
	logger.Println("google_analytics.js static registered :", pattern)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "request_login_url", AuthPlatformGoogle), mg.platform_google_get_login_url)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize", AuthPlatformGoogle), mg.platform_google_authorize)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_result", AuthPlatformGoogle), mg.platform_google_authorize_result)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "request_login_url", AuthPlatformMicrosoft), mg.platform_microsoft_get_login_url)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize", AuthPlatformMicrosoft), mg.platform_microsoft_authorize)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_result", AuthPlatformMicrosoft), mg.platform_microsoft_authorize_result)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "request_login_url", AuthPlatformTwitter), mg.platform_twitter_get_login_url)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize", AuthPlatformTwitter), mg.platform_twitter_authorize)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_result", AuthPlatformTwitter), mg.platform_twitter_authorize_result)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "request_login_url", AuthPlatformApple), mg.platform_apple_get_login_url)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize", AuthPlatformApple), mg.platform_apple_authorize)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_result", AuthPlatformApple), mg.platform_apple_authorize_result)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "request_login_url", AuthPlatformFirebaseAuth), mg.platform_firebaseauth_get_login_url)
	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_sdk", AuthPlatformFirebaseAuth), mg.platform_firebaseauth_authorize_sdk)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_sdk", AuthPlatformSteamSDK), mg.platform_steamsdk_authorize)

	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "authorize_sdk", AuthPlatformHybeim), mg.platform_hybeim_authorize)

	go mg.watchServiceCollection(ctx, serveMux, prefix)
	go mg.watchFileCollection(ctx, serveMux, prefix)
	// fsx := http.FileServer(http.Dir("console"))
	// serveMux.Handle("/console/", http.StripPrefix("/console/", fsx))
	// logger.Println("console file server open")

	return nil
}

func (mg *Maingate) GeneratePlatformLoginNonceKey() string {
	const allowed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	b := make([]byte, 52)
	for i := range b {
		b[i] = allowed[r.Intn(len(allowed))]
	}
	return string(b)
}

func (mg *Maingate) GetUserBrowserInfo(r *http.Request) (string, error) {
	//=========== 브라우저 검증쪽은 앞으로 빼자
	// host, _, err := net.SplitHostPort(r.RemoteAddr)
	// if err != nil {
	// 	logger.Error("Error: RemoteAddr Split Error :", err)
	// }

	cookie, err := r.Cookie("ActionSquareSessionExtraInfo")
	if err != nil {
		return "", logger.ErrorWithCallStack(err)
	}

	//requestinfo := fmt.Sprintf("%s_%s", cookie.Value, host) //-- RemoteAddr체크는 로드밸런서 IP 찍히는 문제 때문에 제외한다.
	requestinfo := fmt.Sprintf("%s_", cookie.Value)
	return requestinfo, nil
}

func (mg *Maingate) setUserToken(info usertokeninfo) error {
	_, _, err := mg.mongoClient.Update(CollectionUserToken, bson.M{
		"platform": info.platform,
		"userid":   info.userid,
	}, bson.M{
		"$set": bson.M{
			"token":                   info.token,
			"secret":                  info.secret,
			"brinfo":                  info.brinfo,
			"lastupdate":              time.Now().Unix(),
			"accesstoken":             info.accesstoken,
			"accesstoken_expire_time": info.accesstoken_expire_time,
		},
	}, options.Update().SetUpsert(true))
	return logger.ErrorWithCallStack(err)
}

func (mg *Maingate) getUserTokenWithCheck(platform string, userid string, brinfo string) (usertokeninfo, error) {

	var info usertokeninfo

	found, err := mg.mongoClient.FindOne(CollectionUserToken, bson.M{
		"platform": platform,
		"userid":   userid,
	})

	if err != nil {
		return info, err
	}
	if found == nil {
		return info, errors.New("user token not found :" + platform + " / " + userid + " / " + brinfo)
	}

	if found["brinfo"].(string) != brinfo {
		return info, errors.New("user brinfo is different :" + platform + " / " + userid + " / " + brinfo)
	}

	updatetime, ok := found["lastupdate"].(int64)

	if !ok || time.Now().Unix()-updatetime < config.Autologin_ttl {
		info.platform = platform
		info.userid = userid
		info.brinfo = brinfo

		token := found["token"]
		if token != nil {
			info.token = token.(string)
		}

		secret := found["secret"]
		if secret != nil {
			info.secret = secret.(string)
		}

		accesstoken := found["accesstoken"]
		if accesstoken != nil {
			info.accesstoken = accesstoken.(string)
		}

		accesstoken_expire_time := found["accesstoken_expire_time"]
		if accesstoken_expire_time != nil {
			info.accesstoken_expire_time = accesstoken_expire_time.(int64)
		}

		return info, nil
	}

	return info, errors.New("session is expired")
}

func (mg *Maingate) updateUserinfo(info usertokeninfo) (bool, string, string) {
	var success bool
	var userid, email string
	success = false
	userid = ""
	email = ""

	switch info.platform {
	case AuthPlatformApple:
		success, userid, email = mg.platform_apple_getuserinfo(info.token)
	case AuthPlatformTwitter:
		success, userid, email = mg.platform_twitter_getuserinfo(info.token, info.secret)
	case AuthPlatformMicrosoft:
		success, userid, email = mg.platform_microsoft_getuserinfo(info)
	case AuthPlatformGoogle:
		success, userid, email = mg.platform_google_getuserinfo(info)
	case AuthPlatformSteamSDK:
		success, userid, email = mg.platform_steamsdk_getuserinfo(info)
	case AuthPlatformHybeim:
		success, userid, email = mg.platform_hybeim_getuserinfo(info)
	case AuthPlatformFirebaseAuth:
		success, userid, email = mg.platform_firebase_getuserinfo(info)
	}

	if !success {
		return false, "", ""
	}

	if info.userid != userid {
		logger.Error("userinfo / id is not match. :", info.userid, " / ", userid)
		return false, "", ""
	}

	mg.setUserToken(info)

	return success, userid, email

}

func (mg *Maingate) getProviderInfo(platform string, uid string) (string, string, error) {
	provider := ""
	providerid := ""

	switch platform {
	case AuthPlatformFirebaseAuth: // Fireabase 통해서 로그인 하는 경우, 원래 제공하는 Google 혹은 Apple쪽 ID와 일치 시킨다
		found, err := mg.mongoClient.FindOne(CollectionFirebaseUserInfo, bson.M{
			"firebaseuserid": uid,
		})

		if err != nil {
			return "", "", err
		}
		if found == nil {
			return "", "", errors.New("firebase info not found: " + uid)
		}
		provider = found["firebaseprovider"].(string)
		providerid = found["firebaseproviderId"].(string)
		if provider == "" || providerid == "" {
			return "", "", errors.New("getProviderInfo - firebase info not found: " + provider + " / " + providerid)
		}
	default:
		provider = platform
		providerid = uid
	}

	if provider == "" || providerid == "" {
		return "", "", errors.New("getProviderInfo - provider info not found: " + provider + " / " + providerid)
	}

	return provider, providerid, nil

}

var errKeyNotFound = errors.New("key not found")

func downloadSigningCert(keyurl string, kid string, alg string) (rsa.PublicKey, error) {

	var publicKey rsa.PublicKey

	resp, err := http.Get(keyurl) // GET 호출
	if err != nil {
		return rsa.PublicKey{}, err
	}
	defer func() {
		io.Copy(io.Discard, resp.Body)
		resp.Body.Close()
	}()

	// 결과 출력
	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return rsa.PublicKey{}, err
	}

	var parseddata map[string]interface{}
	err = json.Unmarshal([]byte(data), &parseddata)
	if err != nil {
		return rsa.PublicKey{}, err
	}

	mapKeys, keysok := parseddata["keys"]
	if !keysok {
		return rsa.PublicKey{}, errKeyNotFound
	}

	keylist, keyok := mapKeys.([]interface{})
	if !keyok {
		return rsa.PublicKey{}, errKeyNotFound
	}

	for _, key := range keylist {
		alg_, alg_ok := key.(map[string]interface{})["alg"]
		kty_, kty_ok := key.(map[string]interface{})["kty"]

		if !alg_ok && kty_ok {
			alg_ = kty_
			alg_ok = kty_ok
		}

		kid_, kid_ok := key.(map[string]interface{})["kid"]
		nkey_, nkey_ok := key.(map[string]interface{})["n"]
		ekey_, ekey_ok := key.(map[string]interface{})["e"]
		if alg_ok && kid_ok && nkey_ok && ekey_ok {

			if (alg_.(string) == alg || (alg == "RS256" && alg_ == "RSA")) && kid_.(string) == kid {
				decode_nkey_, err := base64.RawURLEncoding.DecodeString(nkey_.(string))
				if err != nil {
					return rsa.PublicKey{}, errors.New("n key decode fail")
				}

				if err != nil {
					return rsa.PublicKey{}, errors.New("e key decode fail")
				}
				if ekey_.(string) != "AQAB" && ekey_.(string) != "AAEAAQ" {
					return rsa.PublicKey{}, errors.New("e key is not AQAB or AAEAAQ")
				}

				publicKey = rsa.PublicKey{
					N: new(big.Int).SetBytes(decode_nkey_),
					E: 65537,
				}
			}
		}
	}

	return publicKey, nil
}

func JWTparseCode(keyurl string, code string) (string, string, string) {

	parts := strings.Split(string(code), ".")
	if len(parts) != 3 {
		logger.Error("ErrCannotDecode:", len(parts))
		return "", "", ""
	}
	decoded, err := base64.RawURLEncoding.DecodeString(parts[0])
	if err != nil {
		logger.Error("ErrInvalidTokenPart:", string(decoded))
		return "", "", ""
	}

	var parseddata map[string]string
	err = json.Unmarshal(decoded, &parseddata)
	if err != nil {
		panic(err)
	}

	kid, kidok := parseddata["kid"]
	alg, algok := parseddata["alg"]

	if !kidok {
		logger.Error("ErrorHeader_kid_not_found")
		return "", "", ""
	}
	if !algok {
		logger.Error("ErrorHeader_alg_not_found")
		return "", "", ""
	}

	publicKey, err := downloadSigningCert(keyurl, kid, alg)
	if err != nil {
		logger.Error("ErrorHeader_alg_not_found:", err)
		return "", "", ""
	}

	token, err := jwt.Parse(code, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
			return nil, errors.New("Unexpected signing method:" + token.Header["alg"].(string))
		}

		return &publicKey, nil
	})

	if err != nil {
		if err := err.(*jwt.ValidationError); err != nil {
			if err.Errors == jwt.ValidationErrorExpired {
				logger.Error("ValidationErrorExpired:", err)
				return "", "", ""
			}
			logger.Error("JWT Validation Error:", err)
			return "", "", ""
		}
	}

	claims, ok := token.Claims.(jwt.MapClaims)
	if !ok {
		logger.Error("JWT token.Claims Fail: - MapClaims")
		return "", "", ""
	}

	// for claim := range claims {
	// 	fmt.Println(claim, claims[claim])
	// }

	nonce_, nonchk := claims["nonce"]
	nonce := ""
	if nonchk {
		nonce = nonce_.(string)
	}

	email_, emailchk := claims["email"]
	email := ""
	if emailchk {
		email = email_.(string)
	}

	//--- nonce 체크 필요하다.
	return claims["sub"].(string), email, nonce
}

func (mg *Maingate) google_analytics_js(w http.ResponseWriter, r *http.Request) {
	fgaconfig := Firebase_Google_Analytics_JS_SDK_Config{
		FGA_apiKey:            config.FGA_apiKey,
		FGA_authDomain:        config.FGA_authDomain,
		FGA_databaseURL:       config.FGA_databaseURL,
		FGA_projectId:         config.FGA_projectId,
		FGA_storageBucket:     config.FGA_storageBucket,
		FGA_messagingSenderId: config.FGA_messagingSenderId,
		FGA_appId:             config.FGA_appId,
		FGA_measurementId:     config.FGA_measurementId,
	}
	parsedTemplate, _ := template.ParseFiles("template/fb-ga.min.js")
	err := parsedTemplate.Execute(w, fgaconfig)
	if err != nil {
		logger.Error("Error executing template :", err)
		return
	}
}