package main

import (
	"context"
	"errors"
	"flag"
	"fmt"
	"os"
	"os/signal"
	"path/filepath"
	"runtime"
	"strconv"
	"syscall"
	"time"

	"Moonshark/color"
	"Moonshark/http"
	"Moonshark/metadata"
	"Moonshark/router"
	"Moonshark/runner"
	"Moonshark/runner/lualibs"
	"Moonshark/sessions"
	"Moonshark/utils/config"
	"Moonshark/utils/logger"
	"Moonshark/watchers"

	fin "git.sharkk.net/Sharkk/Fin"
)

type Moonshark struct {
	Config       *config.Config
	LuaRouter    *router.Router
	LuaRunner    *runner.Runner
	HTTPServer   *http.Server
	cleanupFuncs []func() error
	scriptMode   bool
}

func main() {
	configPath := flag.String("config", "config", "Path to configuration file")
	debugFlag := flag.Bool("debug", false, "Enable debug mode")
	scriptPath := flag.String("script", "", "Path to Lua script to execute once")
	flag.Parse()

	scriptMode := *scriptPath != ""
	color.SetColors(color.DetectShellColors())
	banner(scriptMode)

	cfg := config.New(readConfig(*configPath))
	debug := *debugFlag || cfg.Server.Debug
	logger.Debug(debug)

	if debug {
		logger.Debugf("Debug logging enabled")
	}

	moonshark, err := newMoonshark(cfg, debug, scriptMode)
	if err != nil {
		logger.Fatalf("Initialization failed: %v", err)
	}

	defer func() {
		if err := moonshark.Shutdown(); err != nil {
			logger.Errorf("Error during shutdown: %v", err)
			os.Exit(1)
		}
	}()

	if scriptMode {
		if err := moonshark.RunScript(*scriptPath); err != nil {
			logger.Fatalf("Script execution failed: %v", err)
		}
		return
	}

	if err := moonshark.Start(); err != nil {
		logger.Fatalf("Failed to start server: %v", err)
	}

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

	fmt.Print("\n")
	logger.Infof("Shutdown signal received")
}

func newMoonshark(cfg *config.Config, debug, scriptMode bool) (*Moonshark, error) {
	s := &Moonshark{Config: cfg, scriptMode: scriptMode}

	if debug {
		cfg.Server.Debug = true
	}

	poolSize := cfg.Runner.PoolSize
	if scriptMode {
		poolSize = 1
	}
	if poolSize == 0 {
		poolSize = runtime.GOMAXPROCS(0)
	}

	// Initialize runner first (needed for both modes)
	if err := s.initRunner(poolSize); err != nil {
		return nil, err
	}

	if scriptMode {
		logger.Debugf("Script mode initialized")
		return s, nil
	}

	// Server mode: initialize router, watchers, and HTTP server
	if err := s.initRouter(); err != nil {
		return nil, err
	}

	s.setupWatchers()
	s.HTTPServer = http.New(s.LuaRouter, s.LuaRunner, cfg, debug)

	// Log static directory status
	if dirExists(cfg.Dirs.Static) {
		logger.Infof("Static files enabled: %s", color.Yellow(cfg.Dirs.Static))
	} else {
		logger.Warnf("Static directory not found: %s", color.Yellow(cfg.Dirs.Static))
	}

	return s, nil
}

func (s *Moonshark) initRunner(poolSize int) error {
	// Warn about missing directories but continue
	if !dirExists(s.Config.Dirs.Override) {
		logger.Warnf("Override directory not found... %s", color.Yellow(s.Config.Dirs.Override))
		s.Config.Dirs.Override = ""
	}

	for _, dir := range s.Config.Dirs.Libs {
		if !dirExists(dir) {
			logger.Warnf("Lib directory not found... %s", color.Yellow(dir))
		}
	}

	if err := lualibs.InitEnv(s.Config.Dirs.Data); err != nil {
		logger.Warnf("Environment initialization failed: %v", err)
	}

	sessions.GlobalSessionManager.SetCookieOptions("MoonsharkSID", "/", "", false, true, 86400)

	var err error
	s.LuaRunner, err = runner.NewRunner(poolSize, s.Config.Dirs.Data, s.Config.Dirs.FS, s.Config.Dirs.Libs)
	if err != nil {
		return fmt.Errorf("lua runner init failed: %v", err)
	}

	logger.Infof("LuaRunner is g2g with %s states!", color.Yellow(strconv.Itoa(poolSize)))
	return nil
}

func (s *Moonshark) initRouter() error {
	if err := os.MkdirAll(s.Config.Dirs.Routes, 0755); err != nil {
		return fmt.Errorf("failed to create routes directory: %w", err)
	}

	var err error
	s.LuaRouter, err = router.New(s.Config.Dirs.Routes)
	if err != nil {
		return fmt.Errorf("lua router init failed: %v", err)
	}

	logger.Infof("LuaRouter is g2g! %s", color.Yellow(s.Config.Dirs.Routes))
	return nil
}

func (s *Moonshark) setupWatchers() {
	manager := watchers.GetWatcherManager()

	// Watch routes
	if routeWatcher, err := watchers.WatchLuaRouter(s.LuaRouter, s.LuaRunner, s.Config.Dirs.Routes); err != nil {
		logger.Warnf("Routes directory watch failed: %v", err)
	} else {
		routesDir := routeWatcher.GetDir()
		s.cleanupFuncs = append(s.cleanupFuncs, func() error {
			return manager.UnwatchDirectory(routesDir)
		})
	}

	// Watch modules
	if moduleWatchers, err := watchers.WatchLuaModules(s.LuaRunner, s.Config.Dirs.Libs); err != nil {
		logger.Warnf("Module directories watch failed: %v", err)
	} else {
		for _, watcher := range moduleWatchers {
			dirPath := watcher.GetDir()
			s.cleanupFuncs = append(s.cleanupFuncs, func() error {
				return manager.UnwatchDirectory(dirPath)
			})
		}

		plural := "directory"
		if len(moduleWatchers) != 1 {
			plural = "directories"
		}
		logger.Infof("Watching %s module %s.", color.Yellow(strconv.Itoa(len(moduleWatchers))), plural)
	}
}

func (s *Moonshark) RunScript(scriptPath string) error {
	scriptPath, err := filepath.Abs(scriptPath)
	if err != nil {
		return fmt.Errorf("failed to resolve script path: %v", err)
	}

	if _, err := os.Stat(scriptPath); os.IsNotExist(err) {
		return fmt.Errorf("script file not found: %s", scriptPath)
	}

	logger.Infof("Executing: %s", scriptPath)

	resp, err := s.LuaRunner.RunScriptFile(scriptPath)
	if err != nil {
		return fmt.Errorf("execution failed: %v", err)
	}

	if resp != nil && resp.Body != nil {
		logger.Infof("Script result: %v", resp.Body)
	} else {
		logger.Infof("Script executed successfully (no return value)")
	}

	return nil
}

func (s *Moonshark) Start() error {
	if s.scriptMode {
		return errors.New("cannot start server in script mode")
	}

	logger.Infof("Surf's up on port %s!", color.Cyan(strconv.Itoa(s.Config.Server.Port)))

	go func() {
		if err := s.HTTPServer.ListenAndServe(fmt.Sprintf(":%d", s.Config.Server.Port)); err != nil {
			if err.Error() != "http: Server closed" {
				logger.Errorf("Server error: %v", err)
			}
		}
	}()

	return nil
}

func (s *Moonshark) Shutdown() error {
	logger.Infof("Shutting down...")

	if !s.scriptMode && s.HTTPServer != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()

		if err := s.HTTPServer.Shutdown(ctx); err != nil {
			logger.Errorf("HTTP server shutdown error: %v", err)
		}
	}

	for _, cleanup := range s.cleanupFuncs {
		if err := cleanup(); err != nil {
			logger.Warnf("Cleanup error: %v", err)
		}
	}

	if s.LuaRunner != nil {
		s.LuaRunner.Close()
	}

	if err := lualibs.CleanupEnv(); err != nil {
		logger.Warnf("Environment cleanup failed: %v", err)
	}

	logger.Infof("Shutdown complete")
	return nil
}

func dirExists(path string) bool {
	info, err := os.Stat(path)
	return err == nil && info.IsDir()
}

func banner(scriptMode bool) {
	if scriptMode {
		fmt.Println(color.Blue(fmt.Sprintf("Moonshark %s << Script Mode >>", metadata.Version)))
		return
	}

	banner := `
   _____                         _________.__                  __
  /     \   ____   ____   ____  /   _____/|  |__ _____ _______|  | __
 /  \ /  \ /  _ \ /  _ \ /    \ \_____  \ |  |  \\__  \\_  __ \  |/ /
/    Y    (  <_> |  <_> )   |  \/        \|   Y  \/ __ \|  | \/    <
\____|__  /\____/ \____/|___|  /_______  /|___|  (____  /__|  |__|_ \ %s
        \/                   \/        \/      \/     \/           \/
	`
	fmt.Println(color.Blue(fmt.Sprintf(banner, metadata.Version)))
}

func readConfig(path string) *fin.Data {
	file, err := os.Open(path)
	if err != nil {
		logger.Errorf("Failed to open config file %s, using defaults", color.Yellow(path))
		return fin.NewData()
	}
	defer file.Close()

	cfg, err := fin.Load(file)
	if err != nil {
		logger.Errorf("Failed to load config file %s, using defaults", color.Yellow(path))
	}

	return cfg
}