package main

import (
	"flag"
	"log"
	"os"
	"path/filepath"

	"openvpn-manager/internal/api"
	"openvpn-manager/internal/config"
	"openvpn-manager/internal/service"
	"openvpn-manager/internal/store"
	"openvpn-manager/pkg/openvpn"
)

func main() {
	dataDir := flag.String("data", "", "data directory (default $OVPNMGR_DATA or ./data)")
	distDir := flag.String("dist", "", "frontend dist directory (default $OVPNMGR_DIST or ./dist)")
	flag.Parse()

	if *dataDir == "" {
		*dataDir = os.Getenv("OVPNMGR_DATA")
	}
	if *dataDir == "" {
		*dataDir = "./data"
	}
	if *distDir == "" {
		*distDir = os.Getenv("OVPNMGR_DIST")
	}
	if *distDir == "" {
		*distDir = "./dist"
	}
	abs, _ := filepath.Abs(*dataDir)
	cfg := config.Load(abs)

	if err := os.MkdirAll(cfg.PKIDir(), 0o700); err != nil {
		log.Fatalf("mkdir pki: %v", err)
	}
	if err := os.MkdirAll(cfg.InstancesDir(), 0o755); err != nil {
		log.Fatalf("mkdir instances: %v", err)
	}
	if err := os.MkdirAll(cfg.ClientsDir(), 0o755); err != nil {
		log.Fatalf("mkdir clients: %v", err)
	}
	if err := os.MkdirAll(cfg.BackupsDir(), 0o755); err != nil {
		log.Fatalf("mkdir backups: %v", err)
	}

	st, err := store.Open(cfg.DBFile())
	if err != nil {
		log.Fatalf("open store: %v", err)
	}
	ovm := openvpn.NewManager(cfg.OpenVPNBin, cfg.DataDir)
	if err := ovm.EnsureCA(); err != nil {
		log.Printf("warn: ensure CA: %v", err)
	}
	svc := service.New(cfg, st, ovm)

	addr := cfg.Host + ":" + itoa(cfg.Port)
	log.Printf("openvpn-manager listening on %s, data=%s, dist=%s", addr, cfg.DataDir, *distDir)
	srv := api.NewServer(cfg, svc)
	if err := srv.Router(*distDir).Run(addr); err != nil {
		log.Fatal(err)
	}
}

func itoa(n int) string {
	if n == 0 {
		return "0"
	}
	neg := false
	if n < 0 {
		neg = true
		n = -n
	}
	var buf [20]byte
	i := len(buf)
	for n > 0 {
		i--
		buf[i] = byte('0' + n%10)
		n /= 10
	}
	if neg {
		i--
		buf[i] = '-'
	}
	return string(buf[i:])
}