import { z } from "zod";

const envSchema = z.object({
  DATABASE_URL: z.string().url(),
  DATA_DIR: z.string().min(1).default("/data"),
  MEDIA_DIR: z.string().min(1).default("/data/media"),
  WEB_PORT: z.string().regex(/^\d+$/).transform((s) => Number(s)).default("3000"),
});

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

// Lazy parse via Proxy. Next.js's `next build` does a
// "Collecting page data" pass that imports every route module —
// including api/events/route.ts which depends on this env. With a
// top-level `envSchema.parse(process.env)` the parse ran during
// the build container, where DATABASE_URL isn't (and shouldn't be)
// set, and Zod aborted the build with:
//   ZodError: DATABASE_URL: Required
// Deferring the parse until first property access lets the build
// finish (no consumer accesses env during page-data collection)
// while still failing loudly at runtime if the var is missing.
let cached: Env | null = null;
function read(): Env {
  if (cached) return cached;
  cached = envSchema.parse(process.env);
  return cached;
}
export const env: Env = new Proxy({} as Env, {
  get(_t, prop) {
    return read()[prop as keyof Env];
  },
}) as Env;