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']).optional(),

    // Analytics
    UMAMI_WEBSITE_ID: z.preprocess(preprocessEmptyString, z.string().optional()),
    UMAMI_API_ENDPOINT: z.preprocess(
      preprocessEmptyString,
      z.string().url().default('https://analytics.infra.mintel.me'),
    ),

    // 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']).optional(),
    // Gotify
    GOTIFY_URL: z.preprocess(preprocessEmptyString, z.string().url().optional()),
    GOTIFY_TOKEN: z.preprocess(preprocessEmptyString, z.string().optional()),
    // Gatekeeper
    GATEKEEPER_URL: z.preprocess(
      preprocessEmptyString,
      z.string().url().default('http://gatekeeper:3000'),
    ),
    NEXT_PUBLIC_FEEDBACK_ENABLED: z.preprocess(
      (val) => val === 'true' || val === true,
      z.boolean().default(false)
    ),
    GATEKEEPER_BYPASS_ENABLED: z.preprocess(
      (val) => val === 'true' || val === true,
      z.boolean().default(false)
    ),
    INFRA_DIRECTUS_URL: z.preprocess(preprocessEmptyString, z.string().url().optional()),
    INFRA_DIRECTUS_TOKEN: z.preprocess(preprocessEmptyString, z.string().optional()),
  })
  .superRefine((data, ctx) => {
    const target = data.NEXT_PUBLIC_TARGET || data.TARGET;
    const isDev = target === 'development' || !target;
    const isBuildTimeValidation = process.env.SKIP_RUNTIME_ENV_VALIDATION === 'true';
    const isServer = typeof window === 'undefined';

    // Only enforce server-only variables when running on the server.
    // In the browser, non-NEXT_PUBLIC_ variables are undefined and should not trigger validation errors.
    if (isServer && !isDev && !isBuildTimeValidation && !data.MAIL_HOST) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: 'MAIL_HOST is required in non-development environments',
        path: ['MAIL_HOST'],
      });
    }
  });

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,
    UMAMI_WEBSITE_ID: process.env.UMAMI_WEBSITE_ID,
    UMAMI_API_ENDPOINT: process.env.UMAMI_API_ENDPOINT,
    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,
    GOTIFY_URL: process.env.GOTIFY_URL,
    GOTIFY_TOKEN: process.env.GOTIFY_TOKEN,
    GATEKEEPER_URL: process.env.GATEKEEPER_URL,
    NEXT_PUBLIC_FEEDBACK_ENABLED: process.env.NEXT_PUBLIC_FEEDBACK_ENABLED,
    GATEKEEPER_BYPASS_ENABLED: process.env.GATEKEEPER_BYPASS_ENABLED,
    INFRA_DIRECTUS_URL: process.env.INFRA_DIRECTUS_URL,
    INFRA_DIRECTUS_TOKEN: process.env.INFRA_DIRECTUS_TOKEN,
  };
}