package main

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

	"github.com/evilfox/wg-panel/internal/auth"
	"github.com/evilfox/wg-panel/internal/config"
	"github.com/evilfox/wg-panel/internal/db"
	"github.com/evilfox/wg-panel/internal/handlers"
	"github.com/evilfox/wg-panel/internal/mysqlimport"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/jackc/pgx/v5/pgxpool"
)

func main() {
	cfg := config.Load()
	ctx := context.Background()

	root := envOr("APP_ROOT", ".")
	migrationsDir := envOr("MIGRATIONS_DIR", filepath.Join(root, "migrations"))
	templatesDir := envOr("TEMPLATES_DIR", filepath.Join(root, "web", "templates"))
	staticDir := envOr("STATIC_DIR", filepath.Join(root, "web", "static"))

	pool, err := waitForDB(ctx, cfg.DatabaseURL, 60*time.Second)
	if err != nil {
		log.Fatalf("database: %v", err)
	}
	defer pool.Close()

	if err := db.Migrate(ctx, pool, migrationsDir); err != nil {
		log.Fatalf("migrate: %v", err)
	}

	if cfg.AutoImportDump {
		if _, err := os.Stat(cfg.MySQLDumpPath); err == nil {
			if err := mysqlimport.ImportFile(ctx, pool, cfg.MySQLDumpPath); err != nil {
				log.Fatalf("mysql import: %v", err)
			}
		} else {
			log.Printf("mysql dump not found at %s, skip import", cfg.MySQLDumpPath)
		}
	}

	authStore := auth.NewStore(cfg, pool)
	if err := authStore.EnsureAdmin(ctx); err != nil {
		log.Fatalf("ensure admin: %v", err)
	}
	log.Printf("admin ready: username=%s email=%s", cfg.AdminUsername, cfg.AdminEmail)

	app, err := handlers.New(pool, authStore, cfg, templatesDir)
	if err != nil {
		log.Fatalf("handlers: %v", err)
	}

	r := chi.NewRouter()
	r.Use(middleware.RequestID)
	r.Use(middleware.RealIP)
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)
	r.Use(app.OfflineMiddleware)

	fileServer(r, "/static/", http.Dir(staticDir))

	r.Get("/", app.Home)
	r.Get("/healthz", func(w http.ResponseWriter, _ *http.Request) {
		w.Header().Set("Content-Type", "text/plain")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte("ok"))
	})
	r.Get("/login", app.LoginPage)
	r.Post("/login", app.LoginPost)
	r.Get("/logout", app.Logout)
	r.Get("/wg", app.PublicWG)
	r.Get("/wg_config.php", app.PublicWG)

	r.Route("/admin", func(r chi.Router) {
		r.Use(authStore.RequireAdmin)
		r.Get("/", app.AdminDashboard)
		r.Post("/status", app.AdminStatusPost)
		r.Get("/wg", app.AdminWG)
		r.Post("/wg/upload", app.AdminWGUpload)
		r.Post("/wg/delete", app.AdminWGDelete)
		r.Post("/wg/settings", app.AdminWGSettings)
	})

	srv := &http.Server{
		Addr:              ":" + cfg.AppPort,
		Handler:           r,
		ReadHeaderTimeout: 10 * time.Second,
	}

	go func() {
		log.Printf("listening on :%s (%s)", cfg.AppPort, cfg.AppURL)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("server: %v", err)
		}
	}()

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

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	_ = srv.Shutdown(shutdownCtx)
}

func waitForDB(ctx context.Context, databaseURL string, timeout time.Duration) (*pgxpool.Pool, error) {
	deadline := time.Now().Add(timeout)
	var last error
	for time.Now().Before(deadline) {
		pool, err := db.Connect(ctx, databaseURL)
		if err == nil {
			return pool, nil
		}
		last = err
		log.Printf("waiting for postgres: %v", err)
		time.Sleep(2 * time.Second)
	}
	return nil, last
}

func fileServer(r chi.Router, pathPrefix string, root http.FileSystem) {
	r.Handle(pathPrefix+"*", http.StripPrefix(pathPrefix, http.FileServer(root)))
}

func envOr(k, def string) string {
	if v := os.Getenv(k); v != "" {
		return v
	}
	return def
}