package authutil

import (
	"context"
	"fmt"
	"github.com/go-micro/plugins/v4/auth/jwt"
	"github.com/go-redsync/redsync/v4"
	"github.com/go-redsync/redsync/v4/redis/goredis/v9"
	"github.com/google/uuid"
	goredislib "github.com/redis/go-redis/v9"
	"github.com/sirupsen/logrus"
	"go-micro.dev/v4/auth"
	"os"
	"os/signal"
	"sghgogs.com/micro/common"
	"sghgogs.com/micro/common/errorcode"
	"strconv"
	"strings"
	"sync"
	"syscall"
	"time"
)

var (
	JWTAuthService     *JWTAuth
	jwtAuthServiceOnce sync.Once
)

const (
	expiry = time.Second * time.Duration(24*3600)
	// expiry = time.Second * time.Duration(1*3600)
)

type JWTAuth struct {
	Mu        *redsync.Redsync
	Client    *goredislib.Client
	Auth      auth.Auth
	namespace string
	Enable    bool
}

func NewJWTAuth(client *goredislib.Client, namespace string, enable bool) *JWTAuth {
	jwtAuthServiceOnce.Do(func() {
		newAuth := jwt.NewAuth(
			auth.Namespace(namespace),
			auth.PrivateKey("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"),
			auth.PublicKey("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"),
		)

		pool := goredis.NewPool(client) // or, pool := redigo.NewPool(...)

		// Create an instance of redisync to be used to obtain a mutual exclusion
		// lock.
		rs := redsync.New(pool)
		JWTAuthService = &JWTAuth{
			Mu:        rs,
			Client:    client,
			Auth:      newAuth,
			namespace: namespace,
			Enable:    enable,
		}
		handleSignals(client)
	})

	return JWTAuthService
}

// GenerateToken 示例：生成令牌
func (svc *JWTAuth) GenerateToken(userID int64, provider, withType, secret string, scopes []string, md map[string]string) (*auth.Account, error) {
	var account *auth.Account
	lock := svc.Mu.NewMutex(fmt.Sprintf("generate-token-lock-%d", userID))
	// 获取锁，保证原子性
	if err := lock.Lock(); err != nil {
		return account, err
	}
	defer lock.Unlock()
	// 很重要
	md["expiry"] = fmt.Sprintf("%d", time.Now().Add(expiry).Unix())
	generate, err := svc.Auth.Generate(
		fmt.Sprintf("%d", userID),
		auth.WithType(withType),
		auth.WithProvider(provider),
		auth.WithScopes(strings.Join(scopes, ",")),
		auth.WithSecret(secret),
		auth.WithMetadata(md),
	)
	if err != nil {
		code := common.FailedToGenerateTokenErrorCode
		return account, errorcode.New(svc.namespace, common.ErrorMessage[code], int32(code))
	}
	return generate, nil
}

func (svc *JWTAuth) RefreshToken(token string) (*auth.Token, error) {
	var authToken *auth.Token
	lock := svc.Mu.NewMutex("refresh-generate-token-lock")
	// 获取锁，保证原子性
	if err := lock.Lock(); err != nil {
		return authToken, err
	}
	defer lock.Unlock()
	inspect, err := svc.Auth.Inspect(token)
	if err != nil {
		return authToken, err
	}
	inspect.Metadata["expiry"] = fmt.Sprintf("%d", time.Now().Add(expiry).Unix())
	generate, err := svc.Auth.Generate(
		inspect.Metadata["id"],
		auth.WithType("user"),
		auth.WithProvider("system"),
		auth.WithScopes(strings.Join(inspect.Scopes, ",")),
		auth.WithSecret(inspect.Metadata["password"]),
		auth.WithMetadata(inspect.Metadata),
	)
	if err != nil {
		code := common.FailedToGenerateTokenErrorCode
		return authToken, errorcode.New(svc.namespace, common.ErrorMessage[code], int32(code))
	}
	userId, _ := strconv.ParseInt(inspect.Metadata["id"], 10, 64)
	return svc.Token(userId, generate.Secret)
}

// Token 重新刷新token
func (svc *JWTAuth) Token(userID int64, accessToken string) (*auth.Token, error) {
	var authToken *auth.Token
	lock := svc.Mu.NewMutex(fmt.Sprintf("token-lock-%d", userID))
	// 获取锁，保证原子性
	if err := lock.Lock(); err != nil {
		return authToken, err
	}
	defer lock.Unlock()
	return svc.Auth.Token(
		auth.WithExpiry(expiry),
		auth.WithCredentials(fmt.Sprintf("%d", userID), accessToken),
		auth.WithToken(accessToken),
	)
}

// Inspect 检测token 有效期
func (svc *JWTAuth) Inspect(accessToken string) (*auth.Account, error) {
	var account *auth.Account
	lock := svc.Mu.NewMutex(fmt.Sprintf("inspect-lock-%d", uuid.New()))
	// 获取锁，保证原子性
	if err := lock.Lock(); err != nil {
		return account, err
	}
	defer lock.Unlock()

	return svc.Auth.Inspect(accessToken)
}

// StoreToken 存储令牌到Redis
func (svc *JWTAuth) StoreToken(ctx context.Context, ID int64, name, accessToken string) error {
	lock := svc.Mu.NewMutex(fmt.Sprintf("store-token-lock-%d", ID))
	// 获取锁
	if err := lock.Lock(); err != nil {
		return err
	}

	access := fmt.Sprintf("auth:access-token:%v:%s", ID, name)
	err := svc.Client.Set(ctx, access, accessToken, expiry).Err()
	if err != nil {
		err = errorcode.New(svc.namespace, common.ErrorMessage[common.FailedToStoreTokenErrorCode], int32(common.FailedToStoreTokenErrorCode))
		logrus.Error(err)
		return err
	}
	return nil
}

// StoreRevoke 从Redis中删除令牌
func (svc *JWTAuth) StoreRevoke(ctx context.Context, ID int64, name string) error {
	lock := svc.Mu.NewMutex(fmt.Sprintf("store-revoke-lock-%d", ID))
	// 获取锁
	if err := lock.Lock(); err != nil {
		return err
	}
	defer lock.Unlock()
	access := fmt.Sprintf("auth:access-token:%v:%s", ID, name)
	err := svc.Client.Del(ctx, access).Err()
	if err != nil {
		err = errorcode.New(svc.namespace, common.ErrorMessage[common.TokenDeletionFailedErrorCode], int32(common.TokenDeletionFailedErrorCode))
		logrus.Error(err)
		return err
	}
	return nil
}

// StoreVerify 检查是否在有效期内
func (svc *JWTAuth) StoreVerify(ID int64, name string, accessToken string) bool {
	lock := svc.Mu.NewMutex(fmt.Sprintf("store-verify-lock-%d", ID))
	// 获取锁
	if err := lock.Lock(); err != nil {
		// 处理获取锁失败的情况
		return false
	}
	defer lock.Unlock()
	token := fmt.Sprintf("auth:access-token:%v:%s", ID, name)
	return svc.Client.Get(context.Background(), token).Val() == accessToken
}

// Blacklist 将令牌添加到 Redis 黑名单并设置过期时间。
func (svc *JWTAuth) Blacklist(accessToken string) error {
	lock := svc.Mu.NewMutex(fmt.Sprintf("blacklist-lock-%d", uuid.New()))
	// 获取锁
	if err := lock.Lock(); err != nil {
		return err
	}
	defer lock.Unlock()

	// 将令牌添加到 Redis，并设置过期时间
	return svc.Client.Set(context.Background(), accessToken, "blacklisted", expiry).Err()
}

// IsBlacklisted 检查令牌是否在黑名单中。
func (svc *JWTAuth) IsBlacklisted(accessToken string) (bool, error) {
	lock := svc.Mu.NewMutex(fmt.Sprintf("is-blacklisted-lock-%d", uuid.New()))
	// 获取锁
	if err := lock.Lock(); err != nil {
		// 处理获取锁失败的情况
		return false, err
	}
	defer lock.Unlock()
	// 检查令牌是否存在于 Redis 中
	_, err := svc.Client.Get(context.Background(), accessToken).Result()
	if err == goredislib.Nil {
		return false, nil
	} else if err != nil {
		return false, err
	}
	return true, nil
}

// CleanupExpiredTokens 定期清理 Redis 黑名单中的过期令牌。
func (svc *JWTAuth) CleanupExpiredTokens(interval time.Duration) {
	ticker := time.NewTicker(interval)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			svc.cleanupExpiredTokens()
		}
	}
}

func (svc *JWTAuth) cleanupExpiredTokens() {
	lock := svc.Mu.NewMutex("cleanup-expired-tokens-lock")
	// 获取锁
	if err := lock.Lock(); err != nil {
		// 处理获取锁失败的情况
		return
	}
	defer lock.Unlock()

	// 遍历并从 Redis 中删除过期的键
	iter := svc.Client.Scan(context.Background(), 0, "*", 0).Iterator()
	for iter.Next(context.Background()) {
		key := iter.Val()
		ttl := svc.Client.TTL(context.Background(), key).Val()
		if ttl.Seconds() <= 0 {
			svc.Client.Del(context.Background(), key)
		}
	}
}

// handleSignals 在应用程序退出时处理信号
func handleSignals(client *goredislib.Client) {
	c := make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
	go func() {
		<-c
		fmt.Println("Closing Redis connection...")
		if err := client.Close(); err != nil {
			fmt.Println("Error closing Redis connection:", err)
		} else {
			fmt.Println("Redis connection closed.")
		}
		os.Exit(0)
	}()
}