package main

import (
	"bytes"
	"context"
	"encoding/binary"
	"encoding/json"
	"example/minio-into-stck/util"
	"fmt"
	"os"
	"os/exec"
	"os/signal"
	"path/filepath"
	"stck/stck-nsq-msg"
	smsg "stck/stck-nsq-msg/msg"
	"sync"
	"syscall"

	"io"
	// "log"
	"math"
	// "os"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/ClickHouse/clickhouse-go/v2"
	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
	"github.com/fsnotify/fsnotify"
	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"
	"github.com/minio/minio-go/v7/pkg/notification"
	"github.com/natefinch/lumberjack"
	"github.com/nsqio/go-nsq"
	"github.com/sirupsen/logrus"
	"github.com/spf13/viper"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	gorm_logger "gorm.io/gorm/logger"
)

// AppInitConfig is the initial configuration of the application, loaded from the config file.
type AppInitConfig struct {
	Mysql struct {
		User     string `mapstructure:"user"`
		Password string `mapstructure:"password"`
		Host     string `mapstructure:"host"`
		Database string `mapstructure:"database"`
	} `mapstructure:"mysql"`
	Minio struct {
		AccessKey string `mapstructure:"accessKey"`
		Secret    string `mapstructure:"secret"`
		Bucket    string `mapstructure:"bucket"`
		Host      string `mapstructure:"host"`
	} `mapstructure:"minio"`
	Stck struct {
		Host  string `mapstructure:"host"`
		Table string `mapstructure:"table"`
	} `mapstructure:"stck"`
	Nsq struct {
		TcpAddr         string `mapstructure:"tcpAddr"`
		LookupdHttpAddr string `mapstructure:"lookupdHttpAddr"`
	} `mapstructure:"nsq"`
	Main struct {
		UploadRetryMaxTimes     int `mapstructure:"uploadRetryMaxTimes"`
		FailedRetryDelaySeconds int `mapstructure:"failedRetryDelaySeconds"`
	} `mapstructure:"main"`
}

type AppConfig struct {
	// List of name regex patterns to exclude from import.
	ImportBlacklist []string
}

type AppConfigDbEntry struct {
	Key   string `gorm:"primaryKey"`
	Value string
}

// TODO: 插入时先创建行，插入完后更新插入耗时

// UploadRecord Represents a record of an uploaded stream. (A major upload task.)
type UploadRecord struct {
	Key       string `gorm:"primaryKey"`
	CreatedAt time.Time
}

// PartUploadRecord Represents a record of an uploaded part of a stream. (A minor upload task.)
type PartUploadRecord struct {
	StreamName string `gorm:"primaryKey"`
	PartName   string `gorm:"primaryKey"`
	CreatedAt  time.Time
}

type StreamMetadata struct {
	MetricName      string `json:"metric_name"`
	Name            string `json:"name"`
	TimestampOffset int64  `json:"timestamp_offset"`
	Interval        int64  `json:"interval"`
	PartsCount      int64  `json:"parts_count"`
	PointsPerPart   int64  `json:"points_per_part"`
	TotalPoints     int64  `json:"total_points"`
}

var gLocalIpAddress string
var gMachineID string
var gNsqProducer *nsq.Producer
var gNsqConsumer *nsq.Consumer
var gAppStartTime time.Time = time.Now()
var programmaticQuitChan chan struct{} = make(chan struct{}, 1)
var gAppQuitting = false
var gAppExitWaitGroup sync.WaitGroup

var buildtime string

func MakeHeartbeatMsg() *smsg.DeviceHeartbeatMsg {
	m := smsg.MakeDeviceHeartbeatMsg(gMachineID, gAppStartTime.UnixNano(), time.Now().UnixNano(),
		gLocalIpAddress, "minio-into-stck", "0.1.0+dev."+buildtime)
	return &m
}

func PublishMessage(msg stcknsqmsg.StckNsqMsgVariant) error {
	payload, err := stcknsqmsg.ToStckNsqMsgString(msg)
	if err != nil {
		return fmt.Errorf("marshal message error: %w", err)
	}
	err = gNsqProducer.Publish(smsg.ServerDoNotifyTopic, []byte(payload))
	if err != nil {
		return fmt.Errorf("publish message error: %w", err)
	}
	return nil
}

func initNsq() {
	ip, err := stcknsqmsg.GetLocalIP()
	if err != nil {
		logger.Warnf("GetLocalIP error: %s", err)
	} else {
		gLocalIpAddress = ip.String()
		logger.Infof("Local IP: %s", gLocalIpAddress)
	}
	gMachineID = stcknsqmsg.MakeUniqueMachineID()
	logger.Infof("Machine ID: %s", gMachineID)

	fmt.Printf("IP: %s, Machine ID: %s\n", gLocalIpAddress, gMachineID)

	// Connect to NSQ
	nsqConfig := nsq.NewConfig()
	gNsqProducer, err = nsq.NewProducer(appInitCfg.Nsq.TcpAddr, nsqConfig)
	if err != nil {
		logger.Fatalf("NSQ Producer init error: %s", err)
	}
	gNsqConsumer, err = nsq.NewConsumer(smsg.ClientDoActionTopic, gMachineID, nsqConfig)
	if err != nil {
		logger.Fatalf("NSQ Consumer init error: %s", err)
	}
	gNsqConsumer.AddConcurrentHandlers(nsq.HandlerFunc(func(message *nsq.Message) error {
		logger.Debugf("NSQ Consumer received message: %s", message.Body)

		// Parse the message
		recvTime := message.Timestamp
		msg, err := stcknsqmsg.FromString(string(message.Body))
		if err != nil {
			logger.Errorf("NSQ Consumer unmarshal message error: %s", err)
			return nil
		}

		// Process the message
		switch data := msg.Data.(type) {
		case *smsg.DevicePingMsg:
			if !stcknsqmsg.DeviceIdMatches(data.DeviceID, gMachineID) {
				break
			}
			// Write pong
			pongMsg := smsg.MakeDevicePongMsg(gMachineID, recvTime)
			err := PublishMessage(&pongMsg)
			if err != nil {
				logger.Errorf("send pong error: %s", err)
			}
		case *smsg.RequestDeviceExecuteShellScriptMsg:
			if !stcknsqmsg.DeviceIdMatches(data.DeviceID, gMachineID) {
				break
			}
			// Execute the shell script
			resp := smsg.MakeDeviceActionDoneMsg(gMachineID, data.MsgType(), "", recvTime, -1, "")
			result, err := func(data *smsg.RequestDeviceExecuteShellScriptMsg) (string, error) {
				cmd := exec.Command("bash", "-c", data.Script)
				var out bytes.Buffer
				cmd.Stdout = &out
				cmd.Stderr = &out
				err := cmd.Run()
				return out.String(), err
			}(data)
			if err != nil {
				errMsg := fmt.Sprintf("execute shell script error:\n%s\n\noutput:\n%s", err, result)
				// Write error message
				resp.Status = -1
				resp.Msg = errMsg
			} else {
				// Write output
				resp.Status = 0
				resp.Msg = result
			}
			err = PublishMessage(&resp)
			if err != nil {
				logger.Errorf("send action done error: %s", err)
			}
		case *smsg.RequestDeviceUpdateMsg:
			if !stcknsqmsg.DeviceIdMatches(data.DeviceID, gMachineID) {
				break
			}
			if data.ServiceName != "minio-into-stck" {
				break
			}
			resp := smsg.MakeDeviceActionDoneMsg(gMachineID, data.MsgType(), "", recvTime, 0, "")
			result, err := func(data *smsg.RequestDeviceUpdateMsg) (string, error) {
				// Download the update file to /tmp
				downloadPath := "/tmp/minio-into-stck-updater"
				updateScriptPath := filepath.Join(downloadPath, "update.sh")
				var out bytes.Buffer
				err := os.RemoveAll(downloadPath)
				if err != nil {
					return "", err
				}
				err = os.MkdirAll(downloadPath, 0777)
				if err != nil {
					return "", err
				}
				updateScriptContent := fmt.Sprintf(`#!/bin/bash
set -e
cd %s
wget --tries=3 -nv -O installer.tar.gz %s
tar -xzf installer.tar.gz
cd minio-into-stck-installer
./replacing-update.sh
`, downloadPath, data.ServiceBinaryURL)
				err = os.WriteFile(updateScriptPath, []byte(updateScriptContent), 0777)
				if err != nil {
					return "", err
				}
				// Execute the update script
				cmd := exec.Command("bash", "-c", updateScriptPath)
				cmd.Stdout = &out
				cmd.Stderr = &out
				err = cmd.Run()
				return out.String(), err
			}(data)
			if err != nil {
				errMsg := fmt.Sprintf("execute update process error:\n%s\n\noutput:\n%s", err, result)
				// Write error message
				resp.Status = -1
				resp.Msg = errMsg
			} else {
				// Write output
				resp.Status = 0
				resp.Msg = "executed update process successfully\n\noutput:\n" + result
			}
			err = PublishMessage(&resp)
			if err != nil {
				logger.Errorf("send action done error: %s", err)
			}
		case *smsg.ForceDeviceRebootMsg:
			if !stcknsqmsg.DeviceIdMatches(data.DeviceID, gMachineID) {
				break
			}
			programmaticQuitChan <- struct{}{}
		case *smsg.ForceDeviceSendHeartbeatMsg:
			if !stcknsqmsg.DeviceIdMatches(data.DeviceID, gMachineID) {
				break
			}
			// Send heartbeat
			heartBeatMsg := MakeHeartbeatMsg()
			err := PublishMessage(heartBeatMsg)
			if err != nil {
				logger.Errorf("send heartbeat error: %s", err)
			}
		case *smsg.RequestDeviceUploadLogsToMinioMsg:
			if !stcknsqmsg.DeviceIdMatches(data.DeviceID, gMachineID) {
				break
			}
			// Upload logs to MinIO
			resp := smsg.MakeDeviceActionDoneMsg(gMachineID, data.MsgType(), "", recvTime, 0, "")
			minioCreds := credentials.NewStaticV4(appInitCfg.Minio.AccessKey, appInitCfg.Minio.Secret, "")
			minioClient, err := minio.New(appInitCfg.Minio.Host, &minio.Options{
				Creds:  minioCreds,
				Secure: false,
			})
			if err != nil {
				logger.Errorf("MinIO Client init error: %s", err)
				resp.Status = -1
				resp.Msg += fmt.Sprintf("MinIO Client init error: %s\n", err)
			} else {
				if util.FileExists("./logs") {
					err = util.MinioUploadFolder(minioClient, data.RemoteBucket,
						filepath.Join(data.RemoteBasePath, gMachineID, "logs"), "logs")
					if err != nil {
						logger.Errorf("upload logs to MinIO error: %s", err)
						resp.Status = -1
						resp.Msg += fmt.Sprintf("upload logs to MinIO error: %s\n", err)
					}
				}
				if util.FileExists("./log") {
					err = util.MinioUploadFolder(minioClient, data.RemoteBucket,
						filepath.Join(data.RemoteBasePath, gMachineID, "log"), "log")
					if err != nil {
						logger.Errorf("upload log to MinIO error: %s", err)
						resp.Status = -1
						resp.Msg += fmt.Sprintf("upload log to MinIO error: %s\n", err)
					}
				}
			}
			err = PublishMessage(&resp)
			if err != nil {
				logger.Errorf("send action done error: %s", err)
			}
		default:
			logger.Debugf("NSQ Consumer ignored unknown or uninteresting message: %v", msg)
		}

		// Notify NSQ that the message is processed successfully
		return nil
	}), 1)
	// err = gNsqConsumer.ConnectToNSQLookupd(gAppConfig.Nsq.LookupdHttpAddr)
	err = gNsqConsumer.ConnectToNSQD(appInitCfg.Nsq.TcpAddr)
	if err != nil {
		logger.Fatalf("NSQ Consumer connect error: %s", err)
	}
}

var appInitCfg *AppInitConfig = &AppInitConfig{}

func initLoadConfig() {
	viper.SetDefault("main.uploadRetryMaxTimes", 20)
	viper.SetDefault("main.failedRetryDelaySeconds", 5)
	viper.SetConfigFile("./config/application.yaml")
	viper.WatchConfig()
	viper.OnConfigChange(func(e fsnotify.Event) {
		logger.Infoln("Config file changed:", e.Name)
		var newAppInitConfig AppInitConfig
		err := viper.Unmarshal(&newAppInitConfig)
		if err != nil {
			logger.Infoln("Failed to unmarshal config:", err)
			return
		}
		appInitCfg = &newAppInitConfig
	})
	err := viper.ReadInConfig()
	if err != nil {
		logger.Fatalf("Failed to read config file: %v", err)
	}
	err = viper.Unmarshal(appInitCfg)
	if err != nil {
		logger.Errorf("Failed to unmarshal config: %v, exiting...", err)
		fmt.Printf("Failed to unmarshal config: %v, exiting...\n", err)
		os.Exit(1)
	}
}

func initLog() *logrus.Logger {
	// 主日志文件
	log := &lumberjack.Logger{
		Filename:   "./log/minio-into-stck.log", // 日志文件的位置
		MaxSize:    50,                          // 文件最大尺寸（以MB为单位）
		MaxBackups: 5,                           // 保留的最大旧文件数量
		MaxAge:     28,                          // 保留旧文件的最大天数
		Compress:   true,                        // 是否压缩/归档旧文件
		LocalTime:  true,                        // 使用本地时间创建时间戳
	}
	// 错误日志文件
	errorLog := &lumberjack.Logger{
		Filename:   "./log/minio-into-stck.error.log", // 错误日志文件的位置
		MaxSize:    50,                                // 文件最大尺寸（以MB为单位）
		MaxBackups: 5,                                 // 保留的最大旧文件数量
		MaxAge:     28,                                // 保留旧文件的最大天数
		Compress:   true,                              // 是否压缩/归档旧文件
		LocalTime:  true,                              // 使用本地时间创建时间戳
	}
	// 统计日志文件
	statLog := &lumberjack.Logger{
		Filename:   "./log/minio-into-stck.stat.log", // 统计日志文件的位置
		MaxSize:    50,                               // 文件最大尺寸（以MB为单位）
		MaxBackups: 5,                                // 保留的最大旧文件数量
		MaxAge:     28,                               // 保留旧文件的最大天数
		Compress:   true,                             // 是否压缩/归档旧文件
		LocalTime:  true,                             // 使用本地时间创建时间戳
	}

	logger := logrus.New()
	if strings.ToLower(os.Getenv("LOG_LEVEL")) == "trace" {
		logger.SetLevel(logrus.TraceLevel)
	} else {
		logger.SetLevel(logrus.DebugLevel)
	}
	logger.Out = log

	// logger.Out = io.MultiWriter(os.Stdout, log)

	// 设置错误级别日志输出到额外的文件
	logger.AddHook(&ErrorHook{
		Writer: errorLog,
		LogLevels: []logrus.Level{
			logrus.ErrorLevel,
			logrus.FatalLevel,
			logrus.PanicLevel,
		},
	})

	statLogger = logrus.New()
	statLogger.SetLevel(logrus.InfoLevel)
	statLogger.Out = statLog

	return logger
}

// ErrorHook 用于将错误级别的日志输出到额外的文件
type ErrorHook struct {
	Writer    io.Writer
	LogLevels []logrus.Level
}

func (hook *ErrorHook) Fire(entry *logrus.Entry) error {
	line, err := entry.String()
	if err != nil {
		return err
	}
	_, err = hook.Writer.Write([]byte(line))
	return err
}

func (hook *ErrorHook) Levels() []logrus.Level {
	return hook.LogLevels
}

var logger *logrus.Logger
var statLogger *logrus.Logger

var mutexObjFailCounter = &sync.Mutex{}
var objFailCounter map[string]int = make(map[string]int)

func main() {
	var err error

	fmt.Println("Starting minio-into-stck, build time:", buildtime)

	logger = initLog()

	logger.Warnln("Logger initialized.")

	// Load configuration from file
	initLoadConfig()

	// 初始化 NSQ
	initNsq()

	var db *gorm.DB
	var minioClient *minio.Client
	var ckConn driver.Conn

	// Connect to MySQL
	dsn := fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
		appInitCfg.Mysql.User, appInitCfg.Mysql.Password, appInitCfg.Mysql.Host, appInitCfg.Mysql.Database)
	db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
	if err != nil {
		logger.Fatalf("Failed to connect to MySQL: %v", err)
	}
	// Disable logging
	db.Logger = gorm_logger.Discard
	// Get the underlying sql.DB object to close the connection later
	sqlDB, err := db.DB()
	if err != nil {
		logger.Fatalf("Failed to get MySQL DB: %v", err)
	}
	defer sqlDB.Close()
	// Ping the database to check if the connection is successful
	err = sqlDB.Ping()
	if err != nil {
		logger.Infof("ping db error: %v", err)
		return
	}
	logger.Infoln("Database connection successful")
	// Perform auto migration
	err = db.AutoMigrate(&AppConfigDbEntry{}, &UploadRecord{}, &PartUploadRecord{})
	if err != nil {
		logger.Infof("auto migrate error: %v", err)
		return
	}
	logger.Infoln("Auto migration completed")

	// Connect to MinIO
	minioClient, err = minio.New(util.ExpandShellStringInfallible(appInitCfg.Minio.Host), &minio.Options{
		Creds:  credentials.NewStaticV4(appInitCfg.Minio.AccessKey, appInitCfg.Minio.Secret, ""),
		Secure: false,
	})
	if err == nil {
		bucketExists, err := minioClient.BucketExists(context.Background(), appInitCfg.Minio.Bucket)
		if err != nil {
			logger.Fatalf("Failed to check if bucket %s exists: %v", appInitCfg.Minio.Bucket, err)
		}
		if !bucketExists {
			logger.Fatalf("Bucket %s does not exist", appInitCfg.Minio.Bucket)
		}
	}
	if err != nil {
		logger.Fatalf("Failed to connect to MinIO: %v", err)
	}
	logger.Infoln("Connected to MinIO")

	// Connect to ClickHouse
	ckConn, err = clickhouse.Open(&clickhouse.Options{
		Addr: []string{appInitCfg.Stck.Host},
	})
	if err == nil {
		err = ckConn.Ping(context.Background())
	}
	if err != nil {
		logger.Fatalf("Failed to connect to ClickHouse: %v", err)
	}
	logger.Infoln("Connected to ClickHouse")

	// OK! Everything is ready now.

	// objUploadChan := make(chan string, 1024*256)
	objUploadChan := util.NewDChan[string](1024 * 16)

	// Start the main work
	logger.Infoln("Starting main worker...")
	gAppExitWaitGroup.Add(1)
	go func() {
		defer gAppExitWaitGroup.Done()
		main_worker(AppCtx{db, minioClient, ckConn}, objUploadChan)
	}()

	// Wait on signal.
	signalChan := make(chan os.Signal, 1)
	signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)

	select {
	case <-signalChan:
		logger.Infof("received signal, stopping minio-into-stck")
	case <-programmaticQuitChan:
		logger.Infof("received programmatic quit signal, stopping minio-into-stck")
	}

	gAppQuitting = true

	// HACK: Notify the main worker to quit
	objUploadChan.In() <- ""

	// Close the NSQ producer and consumer
	gNsqProducer.Stop()
	gNsqConsumer.Stop()

	// Wait for the goroutines to exit
	gAppExitWaitGroup.Wait()

	logger.Infof("minio-into-stck stopped gracefully")
}

type AppCtx struct {
	db          *gorm.DB
	minioClient *minio.Client
	ckConn      driver.Conn
}

var gAppCfg *AppConfig

type PartUploadArgs struct {
	StreamInfo *StreamMetadata
	StreamName string
	PartName   string
}

func main_worker(app AppCtx, objUploadChan *util.DChan[string]) {
	ctx := context.Background()

	// Load config from DB
	appCfg, err := load_app_cfg_from_db(app.db)
	if err != nil {
		logger.Fatalf("Failed to load app config from DB: %v", err)
	}
	gAppCfg = &appCfg

	// Start the notification listener
	go func() {
		for {
			// Register the bucket notification listener
			logger.Infoln("Registering bucket notification listener...")
			notifys := app.minioClient.ListenBucketNotification(
				ctx, appInitCfg.Minio.Bucket, "", "", []string{string(notification.ObjectCreatedAll)})

			// Listen OK, start the full upload trigger to upload maybe missed files
			go trigger_full_upload(app, objUploadChan.In())

			for notifyInfo := range notifys {
				for _, record := range notifyInfo.Records {
					key := record.S3.Object.Key
					logger.Traceln("New object notification:", key)
					// Only care when `.zst` / `metadata.json` files are uploaded
					// keyParts := strings.Split(key, "/")
					// keyLastPart := keyParts[len(keyParts)-1]
					keyLastPart := filepath.Base(key)
					if keyLastPart != "metadata.json" && !strings.HasSuffix(keyLastPart, ".zst") {
						continue
					}
					// key = strings.Join(keyParts[:len(keyParts)-1], "/") + "/"
					key = filepath.Dir(key) + "/"
					// Remove fail counter so that the object can be retried instead of
					// being spuriously ignored
					mutexObjFailCounter.Lock()
					delete(objFailCounter, key)
					mutexObjFailCounter.Unlock()
					// Queue the object for upload
					objUploadChan.Write(key)
				}
				if notifyInfo.Err != nil {
					logger.Errorf("Bucket notification listener error: %v", notifyInfo.Err)
				}
			}
			logger.Warnln("Bucket notification listener stopped unexpectedly, retrying in 5 seconds...")
			time.Sleep(5 * time.Second)
			// Clear fail counter
			mutexObjFailCounter.Lock()
			objFailCounter = make(map[string]int)
			mutexObjFailCounter.Unlock()
		}
	}()

	// Start the main loop (streams upload worker)
	for objToUpload := range objUploadChan.Out() {
		objUploadChan.MarkElemReadDone(objToUpload)

		if gAppQuitting {
			logger.Infof("Quitting, stopping main worker")
			return
		}

		if objToUpload == "" {
			continue
		}

		logger.Infoln("Checking stream object:", objToUpload)
		if object_is_blacklisted(objToUpload) {
			logger.Infof("Object `%s` is blacklisted, skipping", objToUpload)
			continue
		}

		mutexObjFailCounter.Lock()
		if objFailCounter[objToUpload] >= appInitCfg.Main.UploadRetryMaxTimes {
			logger.Warnf("Retried upload stream `%s` for too many %d times, give up", objToUpload, objFailCounter[objToUpload])
			delete(objFailCounter, objToUpload)
			mutexObjFailCounter.Unlock()
			continue
		}
		objFailCounter[objToUpload]++
		mutexObjFailCounter.Unlock()

		fullyUploaded, err := upload_one_stream(app, objToUpload)
		if err != nil {
			// Queue the object for retry
			logger.Warnf("Failed to upload stream `%s`: `%v`, retrying after %d seconds",
				objToUpload, err, appInitCfg.Main.FailedRetryDelaySeconds)
			objUploadChan.DelayedWrite(objToUpload, time.Duration(appInitCfg.Main.FailedRetryDelaySeconds)*time.Second)
			continue
		}

		if fullyUploaded {
			// Mark the stream as fully uploaded
			//err = app.db.Create(&UploadRecord{Key: objToUpload}).Error
			err = app.db.Where(UploadRecord{Key: objToUpload}).FirstOrCreate(&UploadRecord{}).Error
			if err != nil {
				logger.Warnf("Failed to mark stream %s as uploaded: %v", objToUpload, err)
			} else {
				// We can now remove the stream parts from the parts table
				err = app.db.Where("stream_name = ?", objToUpload).Delete(&PartUploadRecord{}).Error
				if err != nil {
					logger.Warnf("Failed to remove parts of stream %s from parts table: %v", objToUpload, err)
				}
				logger.Infof("Marked stream %s as fully uploaded", objToUpload)
			}

			// Remove entry from the fail counter
			mutexObjFailCounter.Lock()
			delete(objFailCounter, objToUpload)
			mutexObjFailCounter.Unlock()
		} else {
			// Queue the object for retry
			logger.Warnf("Stream %s is not fully uploaded, retrying after %d seconds",
				objToUpload, appInitCfg.Main.FailedRetryDelaySeconds)
			objUploadChan.DelayedWrite(objToUpload, time.Duration(appInitCfg.Main.FailedRetryDelaySeconds)*time.Second)
		}
	}
}

func trigger_full_upload(app AppCtx, objToUploadChan chan<- string) {
	// // Upload all files in the directory
	// options := minio.ListObjectsOptions{
	// 	Recursive: false,
	// }
	// objectsCh := app.minioClient.ListObjects(context.Background(), appInitCfg.Minio.Bucket, options)
	// // NOTE: Streams in minio are organized as `<date>/<stream_name>/`.
	// for objInfo := range objectsCh {
	// 	if objInfo.Err != nil {
	// 		logger.Warnf("Error listing bucket `%s` objects: %v", appInitCfg.Minio.Bucket, objInfo.Err)
	// 		continue
	// 	}
	// 	key := objInfo.Key
	// 	if strings.HasSuffix(key, "/") {
	// 		// Is a directory (<date>), go deeper into it
	// 		options := minio.ListObjectsOptions{
	// 			Prefix:    key,
	// 			Recursive: false,
	// 		}
	// 		for objInfo := range app.minioClient.ListObjects(context.Background(), appInitCfg.Minio.Bucket, options) {
	// 			if objInfo.Err != nil {
	// 				logger.Warnf("Error listing bucket `%s` folder `%s` objects: %v", appInitCfg.Minio.Bucket, key, objInfo.Err)
	// 				continue
	// 			}
	// 			key := objInfo.Key
	// 			if strings.HasSuffix(key, "/") {
	// 				// Is a directory, should be a stream then
	// 				uploaded := object_already_uploaded(app, key)
	// 				if !uploaded {
	// 					objToUploadChan <- key
	// 				}
	// 			}
	// 		}
	// 	}
	// }

	// WARN: Slow!!!
	// options := minio.ListObjectsOptions{
	// 	Recursive: true,
	// }
	options := minio.ListObjectsOptions{
		Recursive: false,
	}
	objectsCh := app.minioClient.ListObjects(context.Background(), appInitCfg.Minio.Bucket, options)
	// NOTE: Streams in minio are organized as `<date>/<stream_name>/`.
	for objInfo := range objectsCh {
		if objInfo.Err != nil {
			logger.Warnf("Error listing bucket `%s` objects: %v", appInitCfg.Minio.Bucket, objInfo.Err)
			continue
		}
		key := objInfo.Key
		// // If it's a directory with `metadata.json` file, it should be a stream
		// if strings.HasSuffix(key, "/metadata.json") {
		// 	streamName := strings.TrimSuffix(key, "metadata.json")
		// 	uploaded := object_already_uploaded(app, streamName)
		// 	if !uploaded {
		// 		objToUploadChan <- streamName
		// 	}
		// }

		// Scan through all subdirectories
		if strings.HasSuffix(key, "/") {
			exists, err := util.MinioObjectExists(app.minioClient, appInitCfg.Minio.Bucket, key+"metadata.json")
			if err != nil {
				logger.Warnf("Error checking if object `%s` exists: %v", key+"metadata.json", err)
				continue
			}
			if exists {
				// Go ahead and upload the stream
				uploaded := object_already_uploaded(app, key)
				if !uploaded {
					objToUploadChan <- key
				}
			} else {
				// Check inner directories
				options := minio.ListObjectsOptions{
					Prefix:    key,
					Recursive: false,
				}
				for objInfo := range app.minioClient.ListObjects(context.Background(), appInitCfg.Minio.Bucket, options) {
					if objInfo.Err != nil {
						logger.Warnf("Error listing bucket `%s` folder `%s` objects: %v", appInitCfg.Minio.Bucket, key, objInfo.Err)
						continue
					}
					key := objInfo.Key
					if strings.HasSuffix(key, "/") {
						// Is a directory, should be a stream then
						uploaded := object_already_uploaded(app, key)
						if !uploaded {
							objToUploadChan <- key
						}
					}
				}
			}
		}
	}
}

func upload_one_stream(app AppCtx, streamName string) (fullyUploaded bool, err error) {
	type StreamObjectUploadStatistics struct {
		StartTime time.Time
		EndTime   time.Time
		PartName  string
		UpState   string // "repeated" / "ok" / "fail"
		Msg       string // "error message"
	}
	type StreamUploadStatistics struct {
		StartTime       time.Time
		EndTime         time.Time
		StreamName      string
		MetaPointsCount int64
		MetaPartsCount  int64
		Objects         map[string]StreamObjectUploadStatistics
		Msg             string
	}
	streamStats := StreamUploadStatistics{
		StartTime:  time.Now(),
		StreamName: streamName,
		Objects:    make(map[string]StreamObjectUploadStatistics),
	}

	logger.Infof("Going to upload stream `%s`", streamName)

	if object_already_uploaded(app, streamName) {
		logger.Infof("Stream `%s` is already uploaded", streamName)
		return true, nil
	}

	defer func() {
		streamStats.EndTime = time.Now()
		repeatedCount := int64(0)
		okCount := int64(0)
		failCount := int64(0)
		totalCount := int64(0)
		objDetailsMsg := ""
		for _, obj := range streamStats.Objects {
			totalCount++
			if obj.UpState == "repeated" {
				repeatedCount++
				objDetailsMsg += fmt.Sprintf("\n{%s: REPEATED (t: %v ~ %v, duration: %v)}",
					obj.PartName, util.FmtMyTime(obj.StartTime), util.FmtMyTime(obj.EndTime), obj.EndTime.Sub(obj.StartTime))
			} else if obj.UpState == "ok" {
				okCount++
				objDetailsMsg += fmt.Sprintf("\n{%s: OK (t: %v ~ %v, duration: %v)}",
					obj.PartName, util.FmtMyTime(obj.StartTime), util.FmtMyTime(obj.EndTime), obj.EndTime.Sub(obj.StartTime))
			} else {
				failCount++
				objDetailsMsg += fmt.Sprintf("\n{%s: FAIL (Reason: %s) (t: %v ~ %v, duration: %v)}",
					obj.PartName, obj.Msg, util.FmtMyTime(obj.StartTime), util.FmtMyTime(obj.EndTime), obj.EndTime.Sub(obj.StartTime))
			}
		}
		statLogger.Infof("Upload stream `%s` took %v (%v ~ %v); is fully uploaded: %v; metadata-reported part count=%d; "+
			"repeated=%d, ok=%d, fail=%d, total=%d; details:%s",
			streamName, streamStats.EndTime.Sub(streamStats.StartTime),
			util.FmtMyTime(streamStats.StartTime), util.FmtMyTime(streamStats.EndTime),
			fullyUploaded, streamStats.MetaPartsCount,
			repeatedCount, okCount, failCount, totalCount, objDetailsMsg)

		// Send upload status changed message
		msg := smsg.MakeStreamInsertToStckStatusChangedMsg(gMachineID, streamStats.StartTime.UnixNano(),
			streamStats.StreamName, streamStats.MetaPointsCount, streamStats.MetaPartsCount,
			okCount, failCount, repeatedCount)
		err := PublishMessage(&msg)
		if err != nil {
			logger.Errorf("send stream insert to stck status changed message error: %s", err)
		}
	}()

	fullyUploaded = true

	// Get stream metadata
	streamInfo, err := get_stream_metadata(app, streamName)
	if err != nil {
		// Cannot continue without metadata
		return false, err
	}
	streamStats.MetaPointsCount = streamInfo.TotalPoints
	streamStats.MetaPartsCount = streamInfo.PartsCount
	if streamInfo.PartsCount == 0 {
		// Edge device didn't finish uploading the stream yet
		logger.Debugf("Marking stream `%s` as not fully uploaded, reason: parts_count=0", streamName)
		fullyUploaded = false
	}

	hasSomething := false

	// Upload parts
	streamObjPath := streamName
	options := minio.ListObjectsOptions{
		Prefix:    streamObjPath,
		Recursive: false,
	}
	logger.Tracef("Listing minio objects in `%s`, bucket `%s`", streamObjPath, appInitCfg.Minio.Bucket)
	// hasSomething := false
	hasMetadata := false
	for objInfo := range app.minioClient.ListObjects(context.Background(), appInitCfg.Minio.Bucket, options) {
		if objInfo.Err != nil {
			return false, objInfo.Err
		}

		if gAppQuitting {
			logger.Infof("Quitting, stopping uploading one stream")
			return false, nil
		}

		logger.Tracef("Checking minio file `%s`", objInfo.Key)

		if strings.HasSuffix(objInfo.Key, "/") {
			continue
		}
		partName := filepath.Base(objInfo.Key)
		if partName == "metadata.json" {
			hasMetadata = true
			continue
		}

		hasSomething = true

		objStat := StreamObjectUploadStatistics{
			StartTime: time.Now(),
			PartName:  partName,
		}

		if part_already_uploaded(app, streamName, partName) {
			objStat.EndTime = time.Now()
			objStat.UpState = "repeated"
			streamStats.Objects[objInfo.Key] = objStat

			logger.Infof("Part `%s` of stream `%s` is already uploaded", objInfo.Key, streamName)
			continue
		}
		if fullyUploaded {
			fullyUploaded = false
			logger.Debugf("Marking stream `%s` as not fully uploaded, reason: part `%s` not uploaded", streamName, objInfo.Key)
		}

		// Do the parts upload
		partInfo := PartUploadArgs{StreamInfo: streamInfo, StreamName: streamName, PartName: objInfo.Key}

		logger.Infof("Uploading part `%s` (total %d) of stream `%s`, total_points=%d",
			partInfo.PartName, partInfo.StreamInfo.PartsCount,
			partInfo.StreamName, partInfo.StreamInfo.TotalPoints)

		err := upload_one_part(app, partInfo.StreamInfo, partInfo.StreamName, partInfo.PartName)
		if err != nil {
			objStat.EndTime = time.Now()
			objStat.UpState = "fail"
			objStat.Msg = err.Error()

			logger.Warnf("Failed to upload part `%s` of stream `%s` (took %v): %v", partInfo.PartName, partInfo.StreamName,
				objStat.EndTime.Sub(objStat.StartTime), err)
			fullyUploaded = false
		} else {
			// Mark the part as uploaded
			//err = app.db.Create(&PartUploadRecord{StreamName: partInfo.StreamName, PartName: partInfo.PartName}).Error
			part := PartUploadRecord{StreamName: partInfo.StreamName, PartName: partName}
			err = app.db.Where(part).FirstOrCreate(&PartUploadRecord{}).Error
			if err != nil {
				logger.Warnf("Failed to mark part `%s` of stream `%s` as uploaded: %v", partInfo.PartName, partInfo.StreamName, err)
			}

			objStat.EndTime = time.Now()
			objStat.UpState = "ok"

			logger.Infof("Uploaded part `%s` of stream `%s`, took %v", objInfo.Key, streamName,
				objStat.EndTime.Sub(objStat.StartTime))
		}

		streamStats.Objects[objInfo.Key] = objStat
		partNum, err := util.ExtractNumberFromString(partName)
		if err != nil {
			// Not a part file? Skip
			continue
		}
		status := "success"
		if objStat.UpState != "ok" {
			status = "failed"
		}
		msg := smsg.MakePartInsertToStckStatusChangedMsg(gMachineID, objStat.StartTime.UnixNano(),
			streamName, partNum, streamStats.MetaPointsCount, status, objStat.Msg)
		err = PublishMessage(&msg)
		if err != nil {
			logger.Errorf("send part insert to stck status changed message error: %s", err)
		}
	}
	if !hasMetadata {
		logger.Warnf("Stream `%s` has no metadata file, will retry later", streamName)
		fullyUploaded = false
	}
	if !hasSomething {
		if streamInfo.PartsCount != 0 {
			logger.Errorf("Stream `%s` has no parts, but claims to have %d parts, %d points???",
				streamName, streamInfo.PartsCount, streamInfo.TotalPoints)
		} else {
			logger.Warnf("Stream `%s` has no parts in minio, will retry later", streamName)
		}
		fullyUploaded = false
	}

	return fullyUploaded, nil
}

func upload_one_part(app AppCtx, streamInfo *StreamMetadata, streamName string, partObjPath string) (err error) {
	partName := filepath.Base(partObjPath)
	if part_already_uploaded(app, streamName, partName) {
		return nil
	}

	dryRun := false
	if !dryRun {
		// Get the part data from MinIO
		obj, err := app.minioClient.GetObject(context.Background(), appInitCfg.Minio.Bucket, partObjPath,
			minio.GetObjectOptions{})
		if err != nil {
			return fmt.Errorf("failed to get part `%s` data: %w", partObjPath, err)
		}
		defer obj.Close()

		// Read the part data
		var partDataBuf = new(bytes.Buffer)
		_, err = partDataBuf.ReadFrom(obj)
		if err != nil {
			return fmt.Errorf("failed to read part `%s` data: %w", partObjPath, err)
		}

		// Process the part data
		partData, err := util.DecompressZstdBuffer(partDataBuf.Bytes())
		if err != nil {
			return fmt.Errorf("failed to decompress part `%s` data: %w", partObjPath, err)
		}

		// Use regex to extract the part index from the part name
		partIndex := int64(0)
		{
			re := regexp.MustCompile(`part_(\d+)\.zst`)
			matches := re.FindStringSubmatch(partObjPath)
			if len(matches) != 2 {
				return fmt.Errorf("failed to extract part index from part name `%s`", partObjPath)
			}
			partIndex, err = strconv.ParseInt(matches[1], 10, 64)
			if err != nil {
				return fmt.Errorf("failed to convert part index `%s` to integer: %w", matches[1], err)
			}

			// Check if the part index is correct
			if partIndex < 0 || (streamInfo.PartsCount != 0 && partIndex >= streamInfo.PartsCount) {
				return fmt.Errorf("part `%s` index out of bounds: %d / %d", partObjPath, partIndex, streamInfo.PartsCount)
			}

			// Check if the part data size is correct
			if streamInfo.PartsCount != 0 {
				left := int64(len(partData))
				if partIndex < streamInfo.PartsCount-1 {
					right := streamInfo.PointsPerPart * 8
					if left != right {
						return fmt.Errorf("part `%s` data size mismatch: %d versus %d", partObjPath, left, right)
					}
				} else if partIndex == streamInfo.PartsCount-1 {
					right := (streamInfo.TotalPoints % streamInfo.PointsPerPart) * 8
					if right == 0 {
						right = streamInfo.PointsPerPart * 8
					}
					if left != right {
						return fmt.Errorf("part `%s` data size mismatch: %d versus %d", partObjPath, left, right)
					}
				} else {
					return fmt.Errorf("part `%s` index out of bounds: %d", partObjPath, partIndex)
				}
			}
		}
		partPointsCount := len(partData) / 8

		// Insert the part data into ClickHouse
		batch, err := app.ckConn.PrepareBatch(context.Background(), "INSERT INTO "+appInitCfg.Stck.Table)
		if err != nil {
			return fmt.Errorf("failed to insert part data into stck: %w", err)
		}
		/*
			┌─name────────┬─type────────────────────────────────────────────────┬─default_type─┬─default_expression─┬─comment───────────────────┬─codec_expression─┬─ttl_expression─┐
			│ metric_name │ LowCardinality(String)                              │              │                    │ Metric name               │                  │                │
			│ point_name  │ LowCardinality(String)                              │              │                    │ Point name                │                  │                │
			│ tags        │ Map(LowCardinality(String), LowCardinality(String)) │              │                    │ Point tags                │                  │                │
			│ value       │ Float64                                             │              │                    │ Point value               │                  │                │
			│ nanoseconds │ Int64                                               │              │                    │ Point time in nanoseconds │ DoubleDelta, LZ4 │                │
			└─────────────┴─────────────────────────────────────────────────────┴──────────────┴────────────────────┴───────────────────────────┴──────────────────┴────────────────┘
		*/
		logger.Debugf("Going to insert %d points for part `%s` of stream `%s`", partPointsCount, partObjPath, streamName)
		for i := 0; i < partPointsCount; i++ {
			metricName := streamInfo.MetricName
			pointName := streamInfo.Name
			tags := map[string]string{}
			value := math.Float64frombits(binary.LittleEndian.Uint64(partData[i*8 : (i+1)*8]))
			// NOTE: TimestampOffset is in milliseconds, need to convert to nanoseconds
			nanoseconds := streamInfo.TimestampOffset * 1e6
			nanoseconds += int64(partIndex) * int64(streamInfo.PointsPerPart) * streamInfo.Interval
			nanoseconds += int64(i) * streamInfo.Interval
			err := batch.Append(metricName, pointName, tags, value, nanoseconds)
			if err != nil {
				return err
			}
		}
		if batch.Rows() != partPointsCount {
			logger.Errorf("Batch rows mismatch: %d / %d???", batch.Rows(), partPointsCount)
		}
		err = batch.Send()
		if err != nil {
			return err
		}
		if !batch.IsSent() {
			logger.Errorln("Batch not sent???")
		}
		logger.Debugf("Inserted %d points for part `%s` of stream `%s`", partPointsCount, partObjPath, streamName)

		// We made progress, reset the fail counter
		mutexObjFailCounter.Lock()
		objFailCounter[streamName] = 0
		mutexObjFailCounter.Unlock()
	}

	return nil
}

func load_app_cfg_from_db(db *gorm.DB) (AppConfig, error) {
	var cfg AppConfig

	err := db.AutoMigrate(&AppConfigDbEntry{})
	if err != nil {
		return cfg, err
	}
	//db.Create(&AppConfigDbEntry{Key: "ImportBlacklist", Value: `[]`})

	var dbEntry AppConfigDbEntry
	result := db.Where(AppConfigDbEntry{Key: "ImportBlacklist"}).Attrs(AppConfigDbEntry{Value: `[]`}).FirstOrCreate(&dbEntry)
	if result.Error != nil {
		//if errors.Is(result.Error, gorm.ErrRecordNotFound) {
		//	dbEntry.Value = `[]`
		//} else {
		//	return cfg, result.Error
		//}
		return cfg, result.Error
	}
	err = json.Unmarshal([]byte(dbEntry.Value), &cfg.ImportBlacklist)
	if err != nil {
		return cfg, err
	}
	return cfg, nil
}

func object_already_uploaded(app AppCtx, key string) bool {
	var record UploadRecord
	result := app.db.First(&record, "key", key)
	return result.Error == nil
}

func object_is_blacklisted(key string) bool {
	for _, regexPattern := range gAppCfg.ImportBlacklist {
		// TODO: Cache compiled regex patterns
		if matched, _ := regexp.MatchString(regexPattern, key); matched {
			return true
		}
	}
	return false
}

func part_already_uploaded(app AppCtx, streamName string, partName string) bool {
	var record PartUploadRecord
	result := app.db.First(&record, "stream_name = ? AND part_name = ?", streamName, partName)
	return result.Error == nil
}

func get_stream_metadata(app AppCtx, streamName string) (*StreamMetadata, error) {
	// Get the stream metadata from MinIO
	metadataObjPath := streamName + "metadata.json"
	obj, err := app.minioClient.GetObject(context.Background(), appInitCfg.Minio.Bucket,
		metadataObjPath, minio.GetObjectOptions{})
	if err != nil {
		return nil, fmt.Errorf("failed to get stream metadata: %w", err)
	}
	defer obj.Close()

	var streamInfo StreamMetadata
	err = json.NewDecoder(obj).Decode(&streamInfo)
	if err != nil {
		return nil, fmt.Errorf("failed to decode stream metadata: %w", err)
	}

	return &streamInfo, nil
}