package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"super-frpc/config"
	"super-frpc/database"
	"super-frpc/frpLogger"
	"super-frpc/global"
	"super-frpc/postLog"
	"super-frpc/session"
	"super-frpc/sys"
	"super-frpc/utils"
	"super-frpc/watchdog"
	"syscall"
	"time"
)

func main() {
	global.CurrentPath = utils.GetCurrentPath()
	postLog.Info(fmt.Sprintf("%s %s (Build %d.%s) by %s", global.Software.Name, global.Software.Version, global.Software.BuildVer, global.Software.BuildType, global.Software.Developer))
	global.ConfigPath = flag.String("config", global.CurrentPath+string(os.PathSeparator)+"config.json", "path to config file")
	global.DBPath_data = flag.String("db", global.CurrentPath+string(os.PathSeparator)+"database.db", "path to database file")
	global.DBPath_log = flag.String("log", global.CurrentPath+string(os.PathSeparator)+"logs.db", "path to logs database file")
	flag.Parse()

	if _, err := os.Stat(*global.ConfigPath); os.IsNotExist(err) {
		// Load the default config
		configData, err := json.MarshalIndent(global.CurrentConfig, "", "  ")
		if err != nil {
			postLog.Warning(fmt.Sprintf("Failed to marshal default config: %v", err))
		} else if err := os.WriteFile(*global.ConfigPath, configData, 0644); err != nil {
			postLog.Warning(fmt.Sprintf("Failed to create default config file: %v", err))
		}
		postLog.Info(fmt.Sprintf("Created default config file at %s", *global.ConfigPath))
	}

	err := config.LoadConfig(*global.ConfigPath, sys.GetInitSystem)
	if err != nil {
		postLog.Fatal(fmt.Sprintf("Failed to load config: %v", err))
	}

	if global.Software.BuildType == "debug" { // If debug build, set debug mode to true
		global.CurrentConfig.Debug = true
	}
	postLog.SetDebugMode(global.CurrentConfig.Debug)
	global.Is.Debug = global.CurrentConfig.Debug

	if err := postLog.InitLogsDatabase(*global.DBPath_log); err != nil {
		postLog.Fatal(fmt.Sprintf("Failed to initialize logs database: %v", err))
	}
	postLog.Info("Logs database initialized successfully")

	if err := database.InitDatabase(*global.DBPath_data, *global.DBPath_log); err != nil {
		postLog.Fatal(fmt.Sprintf("Failed to initialize database: %v", err))
	}
	postLog.Info("Database initialized successfully")

	if err := database.InitFrpcDatabase(*global.DBPath_data); err != nil {
		postLog.Fatal(fmt.Sprintf("Failed to initialize frpc database: %v", err))
	}

	if global.CurrentConfig.LogsPath != "" && !global.CurrentConfig.Status.IsLogrotateConfigured { // Set up logrotate policy if LogsPath is configured
		if err := sys.CreateLogrotatePolicy(); err != nil {
			postLog.Fatal(fmt.Sprintf("Failed to create logrotate policy: %v", err))
		} else {
			global.CurrentConfig.Status.IsLogrotateConfigured = true
			config.SaveConfig()
			postLog.Info("Logrotate policy has been configured successfully.")
		}
	}

	frpLogger.SetDatabase(global.ConfigDB, global.FrpcDB)
	frpLogger.SetDebugMode(global.CurrentConfig.Debug)

	postLog.InitLogBroadcaster()

	setupRoutes()

	// Initialize watchdog connection
	if global.CurrentConfig.Watchdog.Enabled {
		err = watchdog.Init()
		if err != nil {
			postLog.Error(fmt.Sprintf("Unable to initialize Watchdog: %s", err))
		} else {
			if !watchdog.Connect() {
				postLog.Error("Failed to connect to Watchdog")
			} else {
				postLog.Info("Connected to Watchdog successfully")

				go func() {
					if err := watchdog.StartKeepAlive(); err != nil {
						postLog.Error(fmt.Sprintf("Watchdog keepalive stopped: %v", err))
						global.Is.WatchdogConnected = false
					}
				}()
			}
		}
	}	

	addr := fmt.Sprintf("%s:%s", global.CurrentConfig.ListenAddr, global.CurrentConfig.ListenPort)
	server := &http.Server{
		Addr:         addr,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	go func() {
		postLog.Info(fmt.Sprintf("Server starting on %s", addr))
		global.Is.Online = true
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			postLog.Fatal(fmt.Sprintf("Failed to start server: %v", err))
		}
	}()

	go func() {
		ticker := time.NewTicker(1 * time.Hour)
		defer ticker.Stop()
		for range ticker.C {
			session.CleanupExpiredTokens()
			session.CleanupExpiredSessions()
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	postLog.Info("Shutting down server...")

	if err := server.Close(); err != nil {
		postLog.Error(fmt.Sprintf("Server closed with error: %v", err))
	}

	if err := database.CloseDatabase(); err != nil {
		postLog.Error(fmt.Sprintf("Error closing database: %v", err))
	}

	watchdog.Close()

	postLog.Info("Server stopped")
}

func GetStatusHandler(w http.ResponseWriter, r *http.Request) {
	statusInfo := map[string]string{
		"ServerStatus":   "Offline",
		"WatchdogStatus": "Offline",
	}
	if global.Is.Online {
		statusInfo["ServerStatus"] = "Online"
	}
	if global.Is.WatchdogConnected {
		statusInfo["WatchdogStatus"] = "Online"
	}
	utils.SendSuccessResponse(w, "getStatus", statusInfo)
}

func GetSoftwareInfoHandler(w http.ResponseWriter, r *http.Request) {
	utils.SendSuccessResponse(w, "getSoftwareInfo", global.Software)
}