import "dotenv/config";

function env(key: string, defaultValue?: string): string {
  const v = process.env[key];
  if (v !== undefined) return v;
  if (defaultValue !== undefined) return defaultValue;
  throw new Error(`Missing required env: ${key}`);
}

function envInt(key: string, defaultValue: number): number {
  const v = process.env[key];
  if (v === undefined) return defaultValue;
  const n = parseInt(v, 10);
  if (Number.isNaN(n)) throw new Error(`Invalid integer env: ${key}`);
  return n;
}

function envBool(key: string, defaultValue: boolean): boolean {
  const v = process.env[key];
  if (v === undefined) return defaultValue;
  return v === "true" || v === "1";
}

export const config = {
  port: envInt("PORT", 3001),
  trustProxy: envBool("TRUST_PROXY", false),
  /** Public path prefix when behind a reverse proxy that strips it (e.g. nginx /api/ -> backend /). */
  publicBasePath: (process.env.PUBLIC_BASE_PATH ?? "").replace(/\/$/, ""),
  /** Host of the API subdomain (e.g. faucetapi.lnpulse.app). When request Host matches, OpenAPI server URL is /. */
  apiHost: (process.env.API_HOST ?? "faucetapi.lnpulse.app").split(":")[0],
  allowedOrigins: (process.env.ALLOWED_ORIGINS ?? process.env.FRONTEND_URL ?? "http://localhost:5173,http://localhost:5174").split(",").map((s) => s.trim()),

  // Database: omit DATABASE_URL for SQLite; set for Postgres
  databaseUrl: process.env.DATABASE_URL as string | undefined,
  sqlitePath: process.env.SQLITE_PATH ?? "./data/faucet.db",

  // Security
  hmacIpSecret: env("HMAC_IP_SECRET"),
  jwtSecret: env("JWT_SECRET", process.env.HMAC_IP_SECRET ?? ""),
  jwtExpiresInSeconds: envInt("JWT_EXPIRES_IN_SECONDS", 86400 * 7), // 7 days
  nip98MaxSkewSeconds: envInt("NIP98_MAX_SKEW_SECONDS", 300),
  nonceTtlSeconds: envInt("NONCE_TTL_SECONDS", 600),

  // Faucet economics
  faucetEnabled: envBool("FAUCET_ENABLED", true),
  emergencyStop: envBool("EMERGENCY_STOP", false),
  faucetMinSats: envInt("FAUCET_MIN_SATS", 1),
  faucetMaxSats: envInt("FAUCET_MAX_SATS", 5),
  dailyBudgetSats: envInt("DAILY_BUDGET_SATS", 10000),
  maxClaimsPerDay: envInt("MAX_CLAIMS_PER_DAY", 100),
  minWalletBalanceSats: envInt("MIN_WALLET_BALANCE_SATS", 1000),

  // Eligibility
  minAccountAgeDays: envInt("MIN_ACCOUNT_AGE_DAYS", 14),
  minActivityScore: envInt("MIN_ACTIVITY_SCORE", 30),
  minNotesCount: envInt("MIN_NOTES_COUNT", 5),
  minFollowingCount: envInt("MIN_FOLLOWING_COUNT", 10),
  minFollowersCount: envInt("MIN_FOLLOWERS_COUNT", 0),
  activityLookbackDays: envInt("ACTIVITY_LOOKBACK_DAYS", 90),

  // Cooldowns
  cooldownDays: envInt("COOLDOWN_DAYS", 7),
  ipCooldownDays: envInt("IP_COOLDOWN_DAYS", 7),
  maxClaimsPerIpPerPeriod: envInt("MAX_CLAIMS_PER_IP_PER_PERIOD", 1),

  // Nostr (defaults include relays common for remote signers / NIP-05)
  nostrRelays: (process.env.NOSTR_RELAYS ?? "wss://relay.damus.io,wss://relay.nostr.band,wss://relay.getalby.com,wss://nos.lol").split(",").map((s) => s.trim()),
  relayTimeoutMs: envInt("RELAY_TIMEOUT_MS", 5000),
  maxEventsFetch: envInt("MAX_EVENTS_FETCH", 500),
  metadataCacheHours: envInt("METADATA_CACHE_HOURS", 24),

  // LNbits
  lnbitsBaseUrl: env("LNBITS_BASE_URL").replace(/\/$/, ""),
  lnbitsAdminKey: env("LNBITS_ADMIN_KEY"),
  lnbitsWalletId: env("LNBITS_WALLET_ID"),
  depositLightningAddress: process.env.DEPOSIT_LIGHTNING_ADDRESS ?? "",
  depositLnurlp: process.env.DEPOSIT_LNURLP ?? "",
  cashuRedeemApiUrl: (process.env.CASHU_REDEEM_API_URL ?? "https://cashu-redeem.azzamo.net").replace(/\/$/, ""),

  // Sponsors
  baseSponsorPricePerDay: envInt("BASE_SPONSOR_PRICE_PER_DAY", 200),
  sponsorMaxActivePerUser: envInt("SPONSOR_MAX_ACTIVE_PER_USER", 5),
  sponsorMaxVisible: envInt("SPONSOR_MAX_VISIBLE", 6),
  adminPubkeys: (process.env.ADMIN_PUBKEYS ?? "").split(",").map((s) => s.trim()).filter(Boolean),
  /** Public API base URL for LNbits webhook (e.g. https://api.example.com). Required for sponsor payments. */
  publicApiUrl: (process.env.PUBLIC_API_URL ?? process.env.FRONTEND_URL ?? "").replace(/\/$/, ""),
};

export function usePostgres(): boolean {
  return Boolean(config.databaseUrl);
}