package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"

	"dk/internal/auth"
	"dk/internal/csrf"
	"dk/internal/middleware"
	"dk/internal/models/babble"
	"dk/internal/models/control"
	"dk/internal/models/drops"
	"dk/internal/models/forum"
	"dk/internal/models/items"
	"dk/internal/models/monsters"
	"dk/internal/models/news"
	"dk/internal/models/spells"
	"dk/internal/models/towns"
	"dk/internal/models/users"
	"dk/internal/router"
	"dk/internal/routes"
	"dk/internal/session"
	"dk/internal/template"

	"github.com/valyala/fasthttp"
)

func main() {
	var port string
	flag.StringVar(&port, "p", "3000", "Port to run server on")

	if len(os.Args) < 2 {
		startServer(port)
		return
	}

	switch os.Args[1] {
	case "serve":
		flag.CommandLine.Parse(os.Args[2:])
		startServer(port)
	default:
		fmt.Fprintf(os.Stderr, "Unknown command: %s\n", os.Args[1])
		fmt.Fprintln(os.Stderr, "Available commands:")
		fmt.Fprintln(os.Stderr, "  serve   - Start the server")
		fmt.Fprintln(os.Stderr, "  (no command) - Start the server")
		os.Exit(1)
	}
}

func loadModels() error {
	dataDir := "data"

	if err := os.MkdirAll(dataDir, 0755); err != nil {
		return fmt.Errorf("failed to create data directory: %w", err)
	}

	if err := users.LoadData(filepath.Join(dataDir, "users.json")); err != nil {
		return fmt.Errorf("failed to load users data: %w", err)
	}

	if err := towns.LoadData(filepath.Join(dataDir, "towns.json")); err != nil {
		return fmt.Errorf("failed to load towns data: %w", err)
	}

	if err := spells.LoadData(filepath.Join(dataDir, "spells.json")); err != nil {
		return fmt.Errorf("failed to load spells data: %w", err)
	}

	if err := news.LoadData(filepath.Join(dataDir, "news.json")); err != nil {
		return fmt.Errorf("failed to load news data: %w", err)
	}

	if err := monsters.LoadData(filepath.Join(dataDir, "monsters.json")); err != nil {
		return fmt.Errorf("failed to load monsters data: %w", err)
	}

	if err := items.LoadData(filepath.Join(dataDir, "items.json")); err != nil {
		return fmt.Errorf("failed to load items data: %w", err)
	}

	if err := forum.LoadData(filepath.Join(dataDir, "forum.json")); err != nil {
		return fmt.Errorf("failed to load forum data: %w", err)
	}

	if err := drops.LoadData(filepath.Join(dataDir, "drops.json")); err != nil {
		return fmt.Errorf("failed to load drops data: %w", err)
	}

	if err := babble.LoadData(filepath.Join(dataDir, "babble.json")); err != nil {
		return fmt.Errorf("failed to load babble data: %w", err)
	}

	if err := control.Load(filepath.Join(dataDir, "control.json")); err != nil {
		return fmt.Errorf("failed to load control data: %w", err)
	}

	return nil
}

func saveModels() error {
	dataDir := "data"

	if err := users.SaveData(filepath.Join(dataDir, "users.json")); err != nil {
		return fmt.Errorf("failed to save users data: %w", err)
	}

	if err := towns.SaveData(filepath.Join(dataDir, "towns.json")); err != nil {
		return fmt.Errorf("failed to save towns data: %w", err)
	}

	if err := spells.SaveData(filepath.Join(dataDir, "spells.json")); err != nil {
		return fmt.Errorf("failed to save spells data: %w", err)
	}

	if err := news.SaveData(filepath.Join(dataDir, "news.json")); err != nil {
		return fmt.Errorf("failed to save news data: %w", err)
	}

	if err := monsters.SaveData(filepath.Join(dataDir, "monsters.json")); err != nil {
		return fmt.Errorf("failed to save monsters data: %w", err)
	}

	if err := items.SaveData(filepath.Join(dataDir, "items.json")); err != nil {
		return fmt.Errorf("failed to save items data: %w", err)
	}

	if err := forum.SaveData(filepath.Join(dataDir, "forum.json")); err != nil {
		return fmt.Errorf("failed to save forum data: %w", err)
	}

	if err := drops.SaveData(filepath.Join(dataDir, "drops.json")); err != nil {
		return fmt.Errorf("failed to save drops data: %w", err)
	}

	if err := babble.SaveData(filepath.Join(dataDir, "babble.json")); err != nil {
		return fmt.Errorf("failed to save babble data: %w", err)
	}

	if err := control.Save(); err != nil {
		return fmt.Errorf("failed to save control data: %w", err)
	}

	return nil
}

func startServer(port string) {
	fmt.Println("Starting Dragon Knight server...")
	if err := start(port); err != nil {
		log.Fatalf("Server failed: %v", err)
	}
}

func start(port string) error {
	cwd, err := os.Getwd()
	if err != nil {
		return fmt.Errorf("failed to get current working directory: %w", err)
	}

	template.InitializeCache(cwd)

	if err := loadModels(); err != nil {
		return fmt.Errorf("failed to load models: %w", err)
	}

	session.Init("data/_sessions.json")

	r := router.New()
	r.Use(middleware.Timing())
	r.Use(auth.Middleware())
	r.Use(csrf.Middleware())

	r.Get("/", routes.Index)
	r.WithMiddleware(auth.RequireAuth()).Get("/explore", routes.Explore)
	r.WithMiddleware(auth.RequireAuth()).Post("/move", routes.Move)
	routes.RegisterAuthRoutes(r)
	routes.RegisterTownRoutes(r)

	// Use current working directory for static files
	assetsDir := filepath.Join(cwd, "assets")

	// Static file server for /assets
	fs := &fasthttp.FS{
		Root:     assetsDir,
		Compress: false,
	}
	assetsHandler := fs.NewRequestHandler()

	// Combined handler
	requestHandler := func(ctx *fasthttp.RequestCtx) {
		path := string(ctx.Path())

		// Handle static assets - strip /assets prefix
		if len(path) >= 7 && path[:7] == "/assets" {
			// Strip the /assets prefix for the file system handler
			originalPath := ctx.Path()
			ctx.Request.URI().SetPath(path[7:]) // Remove "/assets" prefix
			assetsHandler(ctx)
			ctx.Request.URI().SetPathBytes(originalPath) // Restore original path
			return
		}

		// Handle routes
		r.ServeHTTP(ctx)
	}

	addr := ":" + port
	log.Printf("Server starting on %s", addr)

	// Setup graceful shutdown
	server := &fasthttp.Server{
		Handler: requestHandler,
	}

	// Channel to listen for interrupt signal
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt, syscall.SIGTERM)

	// Start server in a goroutine
	go func() {
		if err := server.ListenAndServe(addr); err != nil {
			log.Printf("Server error: %v", err)
		}
	}()

	// Wait for interrupt signal
	<-c
	log.Println("Received shutdown signal, shutting down gracefully...")

	// Save all model data before shutdown
	log.Println("Saving model data...")
	if err := saveModels(); err != nil {
		log.Printf("Error saving model data: %v", err)
	}

	// Save sessions before shutdown
	log.Println("Saving sessions...")
	if err := session.Close(); err != nil {
		log.Printf("Error saving sessions: %v", err)
	}

	// FastHTTP doesn't have a graceful Shutdown method like net/http
	// We just let the server stop naturally when the main function exits
	log.Println("Server stopped")
	return nil
}