import { existsSync } from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import dotenv from 'dotenv';
import { z } from 'zod';

const projectRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../../..');
const envFiles = [
  path.join(projectRoot, '.env.local'),
  path.join(projectRoot, '.env'),
];

for (const envFile of envFiles) {
  if (existsSync(envFile)) {
    dotenv.config({ path: envFile, override: false });
  }
}

const envSchema = z.object({
  NODE_ENV: z.enum(['development', 'test', 'production']).default('development'),
  APP_HOST: z.string().default('0.0.0.0'),
  APP_PORT: z.coerce.number().int().positive().default(4000),
  APP_ORIGIN: z.string().default('http://localhost:3000'),
  DATABASE_URL: z.string().min(1, 'DATABASE_URL is required'),
  COOKIE_SECRET: z.string().min(1, 'COOKIE_SECRET is required'),
  GOOGLE_MAPS_SERVER_KEY: z.string().optional(),
  PG_BOSS_SCHEMA: z.string().default('pgboss'),
  SESSION_TTL_DAYS: z.coerce.number().int().positive().default(30),
  STRIPE_SECRET_KEY: z.string().optional(),
  STRIPE_PUBLISHABLE_KEY: z.string().optional(),
  STRIPE_WEBHOOK_SECRET: z.string().optional(),
  STRIPE_PRICE_STARTER_MONTHLY: z.string().optional(),
  STRIPE_PRICE_STARTER_ANNUAL: z.string().optional(),
  STRIPE_PRICE_GROWTH_MONTHLY: z.string().optional(),
  STRIPE_PRICE_GROWTH_ANNUAL: z.string().optional(),
  STRIPE_PRICE_PRO_MONTHLY: z.string().optional(),
  STRIPE_PRICE_PRO_ANNUAL: z.string().optional(),
  STRIPE_PRICE_EXPORT_PACK_10K: z.string().optional(),
  STRIPE_PRICE_EXPORT_PACK_50K: z.string().optional(),
  STRIPE_BILLING_PORTAL_CONFIGURATION_ID: z.string().optional(),
  BILLING_ADMIN_EMAILS: z.string().optional(),
});

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

let cachedEnv: AppEnv | null = null;

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

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

export function isBillingAdminEmail(email: string) {
  const allowlist = getEnv().BILLING_ADMIN_EMAILS;

  if (!allowlist) {
    return false;
  }

  return allowlist
    .split(',')
    .map((entry) => entry.trim().toLowerCase())
    .filter(Boolean)
    .includes(email.trim().toLowerCase());
}