import { z } from 'zod';

/**
 * Helper to treat empty strings as undefined.
 */
const preprocessEmptyString = (val: unknown) => (val === '' ? undefined : val);

/**
 * Environment variable schema.
 */
export const envSchema = z.object({
  NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
  NEXT_PUBLIC_BASE_URL: z.preprocess(preprocessEmptyString, z.string().url()),
  NEXT_PUBLIC_TARGET: z
    .enum(['development', 'testing', 'staging', 'production'])
    .default('development'),

  // Analytics
  NEXT_PUBLIC_UMAMI_WEBSITE_ID: z.preprocess(preprocessEmptyString, z.string().optional()),
  NEXT_PUBLIC_UMAMI_SCRIPT_URL: z.preprocess(
    preprocessEmptyString,
    z.string().url().default('https://analytics.infra.mintel.me/script.js'),
  ),

  // Error Tracking
  SENTRY_DSN: z.preprocess(preprocessEmptyString, z.string().optional()),

  // Logging
  LOG_LEVEL: z.enum(['debug', 'info', 'warn', 'error']).default('info'),

  // Mail
  MAIL_HOST: z.preprocess(preprocessEmptyString, z.string().optional()),
  MAIL_PORT: z.preprocess(preprocessEmptyString, z.coerce.number().default(587)),
  MAIL_USERNAME: z.preprocess(preprocessEmptyString, z.string().optional()),
  MAIL_PASSWORD: z.preprocess(preprocessEmptyString, z.string().optional()),
  MAIL_FROM: z.preprocess(preprocessEmptyString, z.string().optional()),
  MAIL_RECIPIENTS: z.preprocess(
    (val) => (typeof val === 'string' ? val.split(',').filter(Boolean) : val),
    z.array(z.string()).default([]),
  ),

  // Directus
  DIRECTUS_URL: z.preprocess(
    preprocessEmptyString,
    z.string().url().default('http://localhost:8055'),
  ),
  DIRECTUS_ADMIN_EMAIL: z.preprocess(preprocessEmptyString, z.string().optional()),
  DIRECTUS_ADMIN_PASSWORD: z.preprocess(preprocessEmptyString, z.string().optional()),
  DIRECTUS_API_TOKEN: z.preprocess(preprocessEmptyString, z.string().optional()),
  INTERNAL_DIRECTUS_URL: z.preprocess(preprocessEmptyString, z.string().url().optional()),

  // Deploy Target
  TARGET: z.enum(['development', 'testing', 'staging', 'production']).default('development'),
});

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

/**
 * Collects all environment variables from the process.
 * Explicitly references NEXT_PUBLIC_ variables for Next.js inlining.
 */
export function getRawEnv() {
  return {
    NODE_ENV: process.env.NODE_ENV,
    NEXT_PUBLIC_BASE_URL: process.env.NEXT_PUBLIC_BASE_URL,
    NEXT_PUBLIC_TARGET: process.env.NEXT_PUBLIC_TARGET,
    NEXT_PUBLIC_UMAMI_WEBSITE_ID: process.env.NEXT_PUBLIC_UMAMI_WEBSITE_ID,
    NEXT_PUBLIC_UMAMI_SCRIPT_URL: process.env.NEXT_PUBLIC_UMAMI_SCRIPT_URL,
    SENTRY_DSN: process.env.SENTRY_DSN,
    LOG_LEVEL: process.env.LOG_LEVEL,
    MAIL_HOST: process.env.MAIL_HOST,
    MAIL_PORT: process.env.MAIL_PORT,
    MAIL_USERNAME: process.env.MAIL_USERNAME,
    MAIL_PASSWORD: process.env.MAIL_PASSWORD,
    MAIL_FROM: process.env.MAIL_FROM,
    MAIL_RECIPIENTS: process.env.MAIL_RECIPIENTS,
    DIRECTUS_URL: process.env.DIRECTUS_URL,
    DIRECTUS_ADMIN_EMAIL: process.env.DIRECTUS_ADMIN_EMAIL,
    DIRECTUS_ADMIN_PASSWORD: process.env.DIRECTUS_ADMIN_PASSWORD,
    DIRECTUS_API_TOKEN: process.env.DIRECTUS_API_TOKEN,
    INTERNAL_DIRECTUS_URL: process.env.INTERNAL_DIRECTUS_URL,
    TARGET: process.env.TARGET,
  };
}