package frpLogger

import (
	"database/sql"
	"fmt"
	"log"
	"net/http"
	"path/filepath"
	"strconv"
	"sync"
	"time"

	"super-frpc/global"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}

type LogMessage struct {
	Level     string `json:"level"`
	Content   string `json:"content"`
	Timestamp string `json:"timestamp"`
}

type InstanceLogStreamer struct {
	instanceID   int
	serviceName  string
	conn         *websocket.Conn
	stopChan     chan struct{}
	doneChan     chan struct{}
	running      bool
	runningMutex sync.Mutex
}

func NewInstanceLogStreamer(instanceID int, serviceName string, conn *websocket.Conn) *InstanceLogStreamer {
	return &InstanceLogStreamer{
		instanceID:  instanceID,
		serviceName: serviceName,
		conn:        conn,
		stopChan:    make(chan struct{}),
		doneChan:    make(chan struct{}),
		running:     false,
	}
}

func (s *InstanceLogStreamer) Start() {
	s.runningMutex.Lock()
	if s.running {
		s.runningMutex.Unlock()
		return
	}
	s.running = true
	s.runningMutex.Unlock()

	go s.streamLogs()
}

func (s *InstanceLogStreamer) Stop() {
	s.runningMutex.Lock()
	defer s.runningMutex.Unlock()

	if !s.running {
		return
	}

	close(s.stopChan)
	<-s.doneChan
	s.running = false
}

func (s *InstanceLogStreamer) IsRunning() bool {
	s.runningMutex.Lock()
	defer s.runningMutex.Unlock()
	return s.running
}

func (s *InstanceLogStreamer) streamLogs() {
	defer close(s.doneChan)

	if !IsInstanceRunning(s.instanceID) {
		s.sendInfo("Instance is not running, no logs to stream")
		return
	}

	logFilePath := filepath.Join(global.CurrentConfig.LogsPath, fmt.Sprintf("superfrpc_%d.log", s.instanceID))
	s.streamLogFile(logFilePath)
}

func (s *InstanceLogStreamer) sendLog(level, content string) {
	msg := LogMessage{
		Level:     level,
		Content:   content,
		Timestamp: time.Now().Format("2006-01-02 15:04:05.000"),
	}

	if err := s.conn.WriteJSON(msg); err != nil {
		log.Printf("[InstanceLogStreamer] Failed to send log message: %v", err)
	}
}

func (s *InstanceLogStreamer) sendError(content string) {
	s.sendLog("ERROR", content)
}

func (s *InstanceLogStreamer) sendInfo(content string) {
	s.sendLog("INFO", content)
}

type FrpcInstance struct {
	ID          int
	UserID      int
	Name        string
	BootAtStart bool
	RunUser     string
	ConfigPath  string
	CreatedAt   time.Time
}

type User struct {
	UserID    int
	Username  string
	Passwd    string
	Type      string
	CreatedAt string
}

var (
	db       *sql.DB
	frpcDB   *sql.DB
	dbMutex  sync.RWMutex
	isDebug  bool
	debugMux sync.RWMutex
)

func SetDatabase(userDB, instanceDB *sql.DB) {
	dbMutex.Lock()
	defer dbMutex.Unlock()
	db = userDB
	frpcDB = instanceDB
}

func SetDebugMode(debug bool) {
	debugMux.Lock()
	defer debugMux.Unlock()
	isDebug = debug
}

func GetDebugMode() bool {
	debugMux.RLock()
	defer debugMux.RUnlock()
	return isDebug
}

func DBQueryFrpcInstanceByID(instanceID int) (FrpcInstance, error) {
	dbMutex.RLock()
	defer dbMutex.RUnlock()

	var instance FrpcInstance
	var createdAtStr string
	err := frpcDB.QueryRow("SELECT id, userID, name, bootAtStart, runUser, configPath, createdAt FROM frpcInstances WHERE id = ?", instanceID).Scan(
		&instance.ID, &instance.UserID, &instance.Name, &instance.BootAtStart, &instance.RunUser, &instance.ConfigPath, &createdAtStr)
	if err != nil {
		return instance, fmt.Errorf("failed to query frpc instance: %w", err)
	}
	instance.CreatedAt, _ = time.Parse(time.RFC3339, createdAtStr)
	return instance, nil
}

func GetUserByID(userID int) (*User, error) {
	dbMutex.RLock()
	defer dbMutex.RUnlock()

	var user User
	err := db.QueryRow("SELECT userID, username, passwd, type, createdAt FROM userLogin WHERE userID = ?", userID).
		Scan(&user.UserID, &user.Username, &user.Passwd, &user.Type, &user.CreatedAt)
	if err != nil {
		return nil, fmt.Errorf("failed to query user: %w", err)
	}

	return &user, nil
}

func GetServiceNameByInstanceID(instanceID int) (string, error) {
	serviceName := fmt.Sprintf("superfrpc_%d", instanceID)
	return serviceName, nil
}

func ParseInstanceIDFromQuery(r *http.Request) (int, error) {
	instanceIDStr := r.URL.Query().Get("instanceID")
	if instanceIDStr == "" {
		return 0, fmt.Errorf("instanceID is required")
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		return 0, fmt.Errorf("invalid instanceID format")
	}

	return instanceID, nil
}

func ParseTokenFromQuery(r *http.Request) string {
	return r.URL.Query().Get("token")
}