package config

import (
	"os"
	"strconv"
	"strings"
	"time"
)

type Config struct {
	Port           string
	BaseURL        string
	HTTPBudgetSec  int
	SessionSecret  string
	DatabaseURL    string
	PanelURL       string
	PanelToken     string
	ServerLabelsJSON string
	MigrationsDir  string
	WebDir         string
}

func Load() Config {
	budget := envInt("APP_HTTP_BUDGET_SEC", 52)
	return Config{
		Port:             env("APP_PORT", "30000"),
		BaseURL:          strings.Trim(env("APP_BASE_URL", ""), "/"),
		HTTPBudgetSec:    budget,
		SessionSecret:    env("APP_SESSION_SECRET", "dev-insecure-change-me-please-32chars"),
		DatabaseURL:      env("DATABASE_URL", "postgres://vpn_admin:vpn_admin@127.0.0.1:5432/vpn_admin?sslmode=disable"),
		PanelURL:         env("AMNEZIA_PANEL_URL", ""),
		PanelToken:       env("AMNEZIA_API_TOKEN", ""),
		ServerLabelsJSON: env("AMNEZIA_SERVER_LABELS_JSON", ""),
		MigrationsDir:    env("MIGRATIONS_DIR", "migrations"),
		WebDir:           env("WEB_DIR", "web"),
	}
}

func (c Config) HTTPBudget() time.Duration {
	if c.HTTPBudgetSec <= 0 {
		return 0
	}
	return time.Duration(c.HTTPBudgetSec) * time.Second
}

func (c Config) AppURL(path string) string {
	path = strings.TrimLeft(path, "/")
	if c.BaseURL == "" {
		return "/" + path
	}
	return "/" + c.BaseURL + "/" + path
}

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

func envInt(k string, def int) int {
	v := os.Getenv(k)
	if v == "" {
		return def
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return def
	}
	return n
}