package config

import (
	"encoding/json"
	"fmt"
	"log"
	"os"
	"reflect"
	"strings"
	"time"

	amqp "github.com/rabbitmq/amqp091-go"
	"github.com/sirupsen/logrus"
	"github.com/spf13/viper"
	"gorm.io/gorm/logger"
)

const (
	LOG_DIR = "./config/logs/query_log"
)

type GroupedFieldsFormatter struct {
	TimestampFormat string
}

func SetupLogger() logger.Interface {
	err := os.MkdirAll(LOG_DIR, os.ModePerm)
	if err != nil {
		log.Fatalf("failed to create log directory: %v", err)
	}

	currentMonth := time.Now().Format("January")
	currentMonth = strings.ToLower(currentMonth)
	logFileName := currentMonth + "_query.log"

	logFile, err := os.OpenFile(LOG_DIR+"/"+logFileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
	if err != nil {
		log.Fatalf("failed to open log file: %v", err)
	}

	newLogger := logger.New(
		log.New(logFile, "\r\n", log.LstdFlags),
		logger.Config{
			SlowThreshold: time.Second,
			LogLevel:      logger.Info,
			Colorful:      false,
		},
	)

	return newLogger
}

func SetupLoggerLogrus() *logrus.Logger {
	err := os.MkdirAll(LOG_DIR, os.ModePerm)
	if err != nil {
		log.Fatalf("failed to create log directory: %v", err)
	}

	currentMonth := time.Now().Format("January")
	currentMonth = strings.ToLower(currentMonth)
	logFileName := currentMonth + "_app.log" // atau "_logrus.log" sesuai kebutuhan

	logFile, err := os.OpenFile(LOG_DIR+"/"+logFileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
	if err != nil {
		log.Fatalf("failed to open log file: %v", err)
	}

	logger := logrus.New()
	logger.SetFormatter(&GroupedFieldsFormatter{TimestampFormat: time.RFC3339})
	logger.SetOutput(logFile)

	// ✔️ Pasang RabbitMQ Hook kalau channel berhasil connect
	if RabbitChannel != nil {
		queue := viper.GetString("RABBITMQ_LOG_QUEUE") // contoh: log_queue
		hook := NewRabbitMQHook(RabbitChannel, queue)
		logger.AddHook(hook)
	}

	logLevel := strings.ToLower(viper.GetString("LOG_LEVEL"))
	if logLevel == "production" {
		logger.SetLevel(logrus.WarnLevel)
	} else {
		logger.SetLevel(logrus.TraceLevel)
	}

	return logger
}

func (f *GroupedFieldsFormatter) Format(entry *logrus.Entry) ([]byte, error) {
	data := make(map[string]interface{})
	fields := make(map[string]interface{})

	// Pisahkan field bawaan dan custom
	for k, v := range entry.Data {
		fields[k] = v
	}
	data["fields"] = fields
	data["level"] = entry.Level.String()
	data["msg"] = entry.Message
	data["time"] = entry.Time.Format(f.TimestampFormat)

	serialized, err := json.Marshal(sanitizeJSON(data))
	if err != nil {
		return nil, err
	}
	return append(serialized, '\n'), nil
}

func sanitizeJSON(v interface{}) interface{} {
	switch val := v.(type) {

	// kalau error → convert ke string
	case error:
		return val.Error()

	// kalau stringer → gunakan String()
	case fmt.Stringer:
		return val.String()
	}

	// kalau map → iterate dan sanitize value di dalamnya
	if m, ok := v.(map[string]interface{}); ok {
		safeMap := make(map[string]interface{})
		for k, val := range m {
			safeMap[k] = sanitizeJSON(val)
		}
		return safeMap
	}

	// func tidak boleh diserialize
	if reflect.TypeOf(v).Kind() == reflect.Func {
		return "<func>"
	}

	// struct kompleks → fallback string agar tidak error
	_, err := json.Marshal(v)
	if err != nil {
		return fmt.Sprintf("%+v", v)
	}

	return v
}

// 🔹 Arahkan log bawaan Go ke logrus (biar library lain ikut nulis ke file)
func RedirectDefaultLogger(logger *logrus.Logger) {
	log.SetOutput(logger.Writer())
}

type RabbitMQHook struct {
	Channel *amqp.Channel
	Queue   string
}

func NewRabbitMQHook(ch *amqp.Channel, queue string) *RabbitMQHook {
	return &RabbitMQHook{
		Channel: ch,
		Queue:   queue,
	}
}

func (h *RabbitMQHook) Levels() []logrus.Level {
	return logrus.AllLevels
}

func (h *RabbitMQHook) Fire(entry *logrus.Entry) error {
	msg := map[string]interface{}{
		"level": entry.Level.String(),
		"msg":   entry.Message,
		"time":  entry.Time.Format(time.RFC3339),
		"data":  entry.Data,
	}

	body, err := json.Marshal(msg)
	if err != nil {
		return err
	}

	return h.Channel.Publish(
		"",
		h.Queue,
		false,
		false,
		amqp.Publishing{
			ContentType: "application/json",
			Body:        body,
		},
	)
}

// type LogMessage struct {
// 	Level   string    `json:"level"`
// 	Message string    `json:"message"`
// 	Time    time.Time `json:"time"`
// }

// func SendLog(level, message string) {
// 	if RabbitChannel == nil {
// 		return
// 	}

// 	logData := LogMessage{
// 		Level:   level,
// 		Message: message,
// 		Time:    time.Now(),
// 	}

// 	body, _ := json.Marshal(logData)

// 	RabbitChannel.Publish(
// 		"",         // default exchange
// 		"app_logs", // queue name
// 		false,
// 		false,
// 		amqp.Publishing{
// 			ContentType: "application/json",
// 			Body:        body,
// 		},
// 	)
// }