import { z } from "zod";

const envSchema = z.object({
  DATABASE_URL: z.string().min(1),
  NEXTAUTH_SECRET: z.string().min(16),
  NEXTAUTH_URL: z.string().url().default("http://localhost:3000"),
});

export type Env = z.infer<typeof envSchema>;

let cached: Env | undefined;

export function getEnv(): Env {
  if (cached) return cached;
  const parsed = envSchema.safeParse(process.env);
  if (!parsed.success) {
    throw new Error(
      `invalid environment: ${JSON.stringify(parsed.error.flatten())}`,
    );
  }
  cached = parsed.data;
  return cached;
}