package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/alecthomas/kong"
	"github.com/gin-gonic/gin"

	"git.linuxforward.com/byom/byom-onboard/internal/common/jwt"
	"git.linuxforward.com/byom/byom-onboard/internal/domain/billing"
	"git.linuxforward.com/byom/byom-onboard/internal/domain/provisioning"
	"git.linuxforward.com/byom/byom-onboard/internal/domain/register"
	"git.linuxforward.com/byom/byom-onboard/internal/platform/config"
	"git.linuxforward.com/byom/byom-onboard/internal/platform/database"
	"git.linuxforward.com/byom/byom-onboard/internal/platform/mailer"
	"git.linuxforward.com/byom/byom-onboard/internal/platform/middleware"
)

var (
	// Build information - values will be set during build
	version   = "dev"
	commit    = "none"
	buildDate = "unknown"
)

type CLI struct {
	Config  string     `help:"Config file path" default:"config.yaml" type:"path"`
	Debug   bool       `help:"Enable debug mode"`
	Version VersionCmd `cmd:"" help:"Show version information"`
	Serve   ServeCmd   `cmd:"" help:"Start the HTTP server"`
}

type VersionCmd struct{}

func (v VersionCmd) Run() error {
	fmt.Printf("Version:\t%s\n", version)
	fmt.Printf("Commit:\t\t%s\n", commit)
	fmt.Printf("Built:\t\t%s\n", buildDate)
	return nil
}

// ServeCmd handles the serve command
type ServeCmd struct {
	Port int    `help:"Port to listen on" default:"8080"`
	Host string `help:"Host to bind to" default:"0.0.0.0"`
}

func (s *ServeCmd) Run(cli *CLI) error {
	// Load configuration
	cfg, err := config.Load()
	if err != nil {
		return fmt.Errorf("failed to load configuration: %w", err)
	}

	// Initialize Gin
	gin.SetMode(gin.ReleaseMode)
	r := gin.New()
	r.Use(gin.Logger())
	r.Use(gin.Recovery())

	if cli.Debug {
		log.Printf("Debug mode enabled")
		gin.SetMode(gin.DebugMode)
		log.Printf("Using config file: %s", cli.Config)
	}

	// Initialize database
	db, err := database.NewDatabase(cfg.Database.DSN)
	if err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	jwtClient := jwt.NewJWTClient([]byte(cfg.JWT.Secret))

	// Initialize services
	stripeClient := billing.NewStripeClient(cfg.Stripe.SecretKey, cfg.Stripe.WebhookSecret)
	mailerClient := mailer.NewMailer(&cfg.Mailer)
	ovhClient := provisioning.NewOvhClient(cfg.OVH.Endpoint, cfg.OVH.AppKey, cfg.OVH.AppSecret)
	registrationService := register.NewRegistrationService(db, jwtClient)

	// Initialize handlers
	billingHandler := billing.NewHandler(stripeClient, db)
	provisioningHandler := provisioning.NewHandler(ovhClient, db)
	registerHandler := register.NewHandler(registrationService, mailerClient, db)

	// Setup server
	server := setupServer(r, billingHandler, provisioningHandler, registerHandler, cfg)
	server.Addr = fmt.Sprintf(":%d", s.Port)

	// Start server in a goroutine
	go func() {
		log.Printf("Starting server on port %d", s.Port)
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Failed to start server: %v", err)
		}
	}()

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

	log.Println("Shutting down server...")
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := server.Shutdown(ctx); err != nil {
		return fmt.Errorf("server forced to shutdown: %w", err)
	}

	log.Println("Server exited properly")
	return nil
}

func setupServer(
	r *gin.Engine,
	billingHandler *billing.Handler,
	provisioningHandler *provisioning.Handler,
	registerHandler *register.Handler,
	config *config.Config,
) *http.Server {

	api := r.Group("/api/v1")
	{
		// Public routes
		api.POST("/register", registerHandler.Register)
		api.GET("/validate-email", registerHandler.ValidateEmail)

		// Payment routes
		api.POST("/payment", billingHandler.CreatePayment)
		api.POST("/payment/webhook", billingHandler.HandleWebhook)

		// Admin routes
		adminMiddleware := middleware.NewAdminMiddleware()
		admin := api.Group("/admin", adminMiddleware.Middleware())
		{
			admin.GET("/vms", provisioningHandler.ListVPS)
			admin.POST("/vms", provisioningHandler.AddVPS)
			admin.GET("/provisioning/:id", provisioningHandler.GetVPSStatus)
		}
	}

	return &http.Server{
		Addr:    config.Server.Address,
		Handler: r,
	}
}

func main() {
	cli := CLI{}
	ctx := kong.Parse(&cli,
		kong.Name("byom"),
		kong.Description("BYOM - Onboarding service"),
		kong.UsageOnError(),
		kong.ConfigureHelp(kong.HelpOptions{
			Compact: true,
			Summary: true,
		}),
	)

	err := ctx.Run(&cli)
	ctx.FatalIfErrorf(err)
}