import { z } from "zod";

const schema = z.object({
  NODE_ENV: z
    .enum(["development", "test", "production"])
    .default("development"),
  APP_URL: z.string().url().default("http://127.0.0.1:3000"),
  DATABASE_PATH: z.string().default("./data/hy2-panel.db"),
  SESSION_SECRET: z
    .string()
    .min(16)
    .default("change-this-session-secret-before-production"),
  SESSION_COOKIE_SECURE: z
    .enum(["auto", "true", "false"])
    .default("auto"),
  SESSION_TTL_HOURS: z.coerce.number().int().min(1).max(24 * 365).default(720),
  ADMIN_USERNAME: z.string().min(1).max(64).default("admin"),
  ADMIN_PASSWORD: z.string().min(8).max(128).default("change-me-now"),
  POLLER_ENABLED: z
    .union([z.literal("true"), z.literal("false")])
    .default("true")
    .transform((value) => value === "true"),
  POLLER_STARTUP_DELAY_MS: z.coerce.number().int().min(0).max(60_000).default(2500),
});

export type AppEnv = z.infer<typeof schema>;

let cachedEnv: AppEnv | null = null;

export function getEnv(): AppEnv {
  if (cachedEnv) {
    return cachedEnv;
  }

  cachedEnv = schema.parse(process.env);
  return cachedEnv;
}