import { config } from "dotenv";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { envSchema, type Env } from "./schema";

// ── Load .env from project root ──
// Resolve relative to this file: packages/env/ → ../../.env = project root
const __dirname = path.dirname(fileURLToPath(import.meta.url));
const projectRoot = path.resolve(__dirname, "..", "..");
config({ path: path.resolve(projectRoot, ".env") });

// ── Parse & validate ──
function parseEnv(): Env {
  const raw: Record<string, string | undefined> = {};

  // Collect only the keys we care about from process.env
  for (const key of Object.keys(envSchema.shape)) {
    raw[key] = process.env[key];
  }

  const result = envSchema.safeParse(raw);

  if (!result.success) {
    const errors = result.error.issues
      .map((issue) => `  - ${issue.path.join(".")}: ${issue.message}`)
      .join("\n");
    throw new Error(`Environment variable validation failed:\n${errors}`);
  }

  return result.data;
}

export const env: Readonly<Env> = parseEnv();

// Re-export the type for consumers
export type { Env } from "./schema";