import { config } from 'dotenv';
import { z } from 'zod';

config();

const emptyToUndefined = (value: unknown) =>
  value === '' || value === undefined || value === null ? undefined : value;

const EnvSchema = z.object({
  NODE_ENV: z.enum(['development', 'test', 'production']).default('development'),
  BOT_TOKEN: z.string().min(1),
  BOT_CLIENT_ID: z.string().min(1),
  BOT_GUILD_ID: z.preprocess(emptyToUndefined, z.string().min(1).optional()),
  DATABASE_URL: z.string().url(),
  REDIS_URL: z.string().url(),
  LOG_LEVEL: z.string().default('info'),
  DEFAULT_LOCALE: z.enum(['de', 'en']).default('de'),
  BACKUP_RETENTION_DAYS: z.coerce.number().int().positive().default(14),
  BACKUP_CRON: z.string().default('0 3 * * *'),
  BACKUP_DIR: z.string().default('/backups'),
  METRICS_TOKEN: z.preprocess(emptyToUndefined, z.string().min(1).optional()),
  SENTRY_DSN: z.preprocess(emptyToUndefined, z.string().url().optional()),
  HEALTH_PORT: z.coerce.number().int().positive().default(8080),
  PUBLIC_BASE_URL: z.string().url().default('http://localhost:8080'),
  TWITCH_CLIENT_ID: z.preprocess(emptyToUndefined, z.string().min(1).optional()),
  TWITCH_CLIENT_SECRET: z.preprocess(emptyToUndefined, z.string().min(1).optional()),
  OWNER_USER_IDS: z.preprocess(
    emptyToUndefined,
    z
      .string()
      .optional()
      .transform((value) =>
        value
          ? value
              .split(',')
              .map((id) => id.trim())
              .filter((id) => id.length > 0)
          : []
      )
  ),
  WEBUI_URL: z.preprocess(emptyToUndefined, z.string().url().optional()),
  SUPPORT_SERVER_URL: z.preprocess(emptyToUndefined, z.string().url().optional()),
  /// Salt for hashing client IPs in verification alt-detection (shared with WebUI).
  CAPTCHA_IP_HASH_SALT: z.preprocess(emptyToUndefined, z.string().min(16).optional())
});

export const env = EnvSchema.parse(process.env);

export function buildBotInviteUrl(clientId = env.BOT_CLIENT_ID): string {
  const url = new URL('https://discord.com/api/oauth2/authorize');
  url.searchParams.set('client_id', clientId);
  url.searchParams.set('permissions', '4786708802825463');
  url.searchParams.set('scope', 'bot applications.commands');
  return url.toString();
}