/**
 * Engine settings (ADAPTED for vendoring).
 *
 * Upstream this module also loaded `.env` (`dotenv`) and bound `parseSettings`
 * to `process.env` via a `loadSettings()` entry point. In gitmost the engine is
 * driven IN-PROCESS by the NestJS server, which builds the `Settings` object
 * from `EnvironmentService` — so the engine must NOT reach into
 * `process.env` here. We therefore vendor ONLY:
 *   - the `Settings` type the engine consumes, and
 *   - `parseSettings(env)` as a PURE function (validate a raw env object -> typed
 *     `Settings`), kept for unit tests and for the server to reuse if it wants
 *     to validate an env-shaped object.
 * The `loadSettings()` / `loadDotenv()` side-effecting entry point is dropped.
 */
import { z } from 'zod';

// Schema keyed by the real ENV variable names so validation errors name the
// exact variable. Credentials and the address of our OWN Docmost instance have
// NO default — a missing value must fail at startup, never silently fall back.
export const envSchema = z.object({
  // Docmost connection — address of our own instance, no default.
  DOCMOST_API_URL: z.string().url(),
  // Credentials for /auth/login — no default, never hardcoded.
  DOCMOST_EMAIL: z.string().min(1),
  DOCMOST_PASSWORD: z.string().min(1),
  // Which Docmost space to mirror.
  DOCMOST_SPACE_ID: z.string().min(1),

  // Local git vault (state store) — kept under data/ so the volume persists it.
  VAULT_PATH: z.string().min(1).default('data/vault'),
  // Optional git remote the vault pushes to. Empty string is treated as unset.
  GIT_REMOTE: z.preprocess(
    (v) => (v === '' ? undefined : v),
    z.string().min(1).optional(),
  ),

  // Non-secret tunables — sensible defaults are fine.
  POLL_INTERVAL_MS: z.coerce.number().int().positive().default(15000),
  DEBOUNCE_MS: z.coerce.number().int().positive().default(2000),
  LOG_LEVEL: z.enum(['debug', 'info', 'warn', 'error']).default('info'),
});

export type Settings = {
  docmostApiUrl: string;
  docmostEmail: string;
  docmostPassword: string;
  docmostSpaceId: string;
  vaultPath: string;
  gitRemote?: string;
  pollIntervalMs: number;
  debounceMs: number;
  logLevel: 'debug' | 'info' | 'warn' | 'error';
};

// Pure: validate a raw environment object and map it to a typed Settings.
// Throws ZodError on bad config. No side effects — safe to import in tests.
export function parseSettings(env: NodeJS.ProcessEnv): Settings {
  const e = envSchema.parse(env);
  return {
    docmostApiUrl: e.DOCMOST_API_URL,
    docmostEmail: e.DOCMOST_EMAIL,
    docmostPassword: e.DOCMOST_PASSWORD,
    docmostSpaceId: e.DOCMOST_SPACE_ID,
    vaultPath: e.VAULT_PATH,
    gitRemote: e.GIT_REMOTE,
    pollIntervalMs: e.POLL_INTERVAL_MS,
    debounceMs: e.DEBOUNCE_MS,
    logLevel: e.LOG_LEVEL,
  };
}