// ============================================================================
// W1 runtime body — Customer provision + STATUS LIFECYCLE (Step 3).
// Rebuilt by `node n8n/gen_w1.js` (single source of truth = shared/effective-grants.js).
//
// Single self-contained Code node (plus webhook + id extract). Replaces the
// old multi-node chain with the SAME provision behaviour PLUS status lifecycle.
//
// LIFECYCLE MATRIX (account-level state, 2026-08-23):
//
//   status active  (no user yet)  -> provision (create role + user), recompute
//                                    effective grants, enable user.
//   status active  (has user)     -> re-enable + RECOMPUTE effective grants
//                                    (never restore stale scopes), apply.
//
//   status pending/suspended/expired/deleted:
//     - has user/role  -> disable AList user + clear role scopes (soft; keep
//                         user + role + CustomerProducts + history).
//     - no user yet    -> no-op (pure NocoDB label; do NOT create AList user).
//
//   All resume transitions (pending/suspended/expired/deleted -> active) recompute
//   from current CustomerProducts + Product Resources + expiry; never restore old
//   scopes, and never mutate CustomerProducts automatically.
//
// SELF-WRITE-BACK SUPPRESSION (loop guard, 2026-08-23 rewrite):
//   We distinguish an ADMIN business change from our OWN write-back echo using
//   the NocoDB v2 webhook's old/new rows (`previous_rows` vs `rows`), NOT the
//   brittle `sync_status === 'synced'` check.
//
//     businessChanged  = a BUSINESS field moved (status / username / password /
//                        display_name / email / notes) OR `sync_required` is set.
//     echo             = only our bookkeeping fields moved (alist_user_id,
//                        alist_role_id, sync_status, sync_required=false,
//                        last_sync, last_sync_error).
//
//   We always write back with `sync_required: false` (and clear it), so our own
//   echo re-enters with businessChanged === false -> skip immediately, before
//   any AList mutation. An admin flipping status (or setting sync_required) is
//   the ONLY thing that proceeds past the guard — exactly once.
//
//   Value-change write-back guard: writeBack() re-reads the record and only
//   PATCHes fields that would actually CHANGE. Writing the same value produces
//   no PATCH -> no webhook -> no loop, even if NocoDB webhooks fire on any field.
//
// Idempotency: final state is converged per status (see above). Duplicate or
// echo webhooks re-apply the same end state with zero net change.
// ============================================================================
// __SHARED_INLINE__  (replaced by shared/effective-grants.js source at build)
// ============================================================================

const ctx = { $env, helpers: this.helpers };

// 1. fresh customer record by id (from webhook extract)
const customerId = $json.customerId;

// NocoDB v2 webhook payload carries the pre/post rows. The extract node already
// surfaced customerId; here we re-read the record for the authoritative
// CURRENT field values (source of truth = NocoDB), and separately inspect the
// event's old/new rows to decide business-change vs echo.
const cust = await ncGet(ctx, `/api/v2/tables/${$env.NOCODB_TABLE_CUSTOMERS}/records/${customerId}`);
const status = cust.status || 'active';
const username = cust.username;
if (!username) throw new Error('Customer missing username');
const alistUserId = cust.alist_user_id ?? null;
const alistRoleId = cust.alist_role_id ?? null;
const alreadyProvisioned = !!(alistUserId && alistRoleId);

// 2. admin login
const login = await alistReq(ctx, 'POST', '/api/auth/login', {
  username: $env.ALIST_ADMIN_USERNAME,
  password: $env.ALIST_ADMIN_PASSWORD,
}, null);
const token = login?.data?.token;
if (!token) throw new Error('AList login failed');

// 3. LOOP GUARD — distinguish admin business change from our own echo.
//    The extract node passes through the raw rows so we can diff. Fall back to
//    "always proceed" if the payload rows are missing (better a redundant
//    idempotent provision than a silently dropped admin change).
const oldRow = ($json.previousRow && Object.keys($json.previousRow).length) ? $json.previousRow : null;
const newRow = ($json.newRow && Object.keys($json.newRow).length) ? $json.newRow : null;

// Business fields an admin edits to MEAN a change. Bookkeeping fields (ids,
// sync_*, last_sync*) are what WE write and must never by themselves count as
// a business change.
const BUSINESS_FIELDS = ['status', 'username', 'password', 'display_name', 'email', 'notes'];

function businessChanged() {
  // sync_required explicitly set by admin => force reprocess (one-shot override).
  if (cust.sync_required === true || cust.sync_required === 1) return true;

  // After-INSERT: there is a new row but no previous row. This is a fresh
  // customer creation -> treat as a business change (provision / deactivate).
  if (newRow && !oldRow) return true;

  // If we have old+new rows, compare only business fields.
  if (oldRow && newRow) {
    for (const f of BUSINESS_FIELDS) {
      if ((oldRow[f] ?? null) !== (newRow[f] ?? null)) return true;
    }
    // Any business field present in new but matching old, or bookkeeping-only
    // delta => echo. Also guard against a field we didn't list changing: if a
    // business field existed in the row and moved, catch it generically.
    for (const f of Object.keys(newRow)) {
      // skip pure bookkeeping fields
      if (['alist_user_id','alist_role_id','sync_status','sync_required','last_sync','last_sync_error','Id','UpdatedAt','CreatedAt'].includes(f)) continue;
      if ((oldRow[f] ?? null) !== (newRow[f] ?? null)) return true;
    }
    return false;
  }

  // Both rows missing (unknown shape): fall back to provisioning only when
  // provision is genuinely incomplete OR status changed from what AList has.
  // To stay safe against loops, treat "no info" as skip-UNLESS-sync_required,
  // which admin can set explicitly.
  return false;
}

if (!businessChanged()) {
  // Our own write-back echo (or a bookkeeping-only save). Refuse to re-apply.
  // Nothing is written back here, so no further webhook is generated.
  return { json: { customerId, username, status, lifecycle: 'skip_writeback_echo', actions: [] } };
}

// 4. STATUS BRANCH ---------------------------------------------------------

// writeBack with a VALUE-CHANGE guard: re-read the live record and PATCH only
// fields whose value actually differs. If nothing differs -> no PATCH -> no
// webhook -> loop is physically broken at the source.
const writeBack = async (fields) => {
  const live = await ncGet(ctx, `/api/v2/tables/${$env.NOCODB_TABLE_CUSTOMERS}/records/${customerId}`);
  const changes = {};
  for (const k of Object.keys(fields)) {
    const want = fields[k];
    const have = live[k];
    if (want !== have) changes[k] = want;
  }
  if (Object.keys(changes).length === 0) return; // no-op: nothing changed
  await ctx.helpers.httpRequest({
    method: 'PATCH',
    url: `${$env.NOCODB_URL}/api/v2/tables/${$env.NOCODB_TABLE_CUSTOMERS}/records`,
    headers: { 'xc-token': $env.NOCODB_TOKEN },
    body: [Object.assign({ Id: customerId }, changes)],
    json: true,
  });
};

if (status !== 'active') {
  // pending / suspended / expired / deleted / unknown -> deactivate.
  //   - has user/role: disable AList user + clear role scopes (soft).
  //   - no user yet:   no-op (pure label; do NOT create AList user).
  if (!alistUserId && !alistRoleId) {
    return { json: { customerId, username, status, lifecycle: 'noop_not_provisioned', actions: [] } };
  }
  const actions = [];
  if (alistUserId) {
    await alistReq(ctx, 'POST', '/api/admin/user/update', { id: alistUserId, disabled: true }, token);
    actions.push('disable_user');
  }
  if (alistRoleId) {
    const role = await alistReq(ctx, 'GET', `/api/admin/role/get?id=${alistRoleId}`, null, token);
    await alistReq(ctx, 'POST', '/api/admin/role/update', {
      id: alistRoleId,
      name: role?.data?.name,
      description: role?.data?.description,
      permission_scopes: [],
    }, token);
    actions.push('clear_scopes');
  }
  // value-change guarded write-back; echo re-entry sees businessChanged()===false.
  await writeBack({ sync_status: 'synced', sync_required: false, last_sync_error: null });
  return { json: { customerId, username, status, lifecycle: 'deactivate', actions } };
}

// status === 'active' -------------------------------------------------------

const actions = [];
let finalUserId = alistUserId;
let finalRoleId = alistRoleId;

// 4a. ensure role exists
if (!finalRoleId) {
  await alistReq(ctx, 'POST', '/api/admin/role/create', {
    name: 'customer-' + username,
    description: 'Auto role for ' + username,
    default: false,
    permission_scopes: [],
  }, token);
  const roles = await alistReq(ctx, 'GET', '/api/admin/role/list?page=1&per_page=100', null, token);
  const r = (roles?.data?.content || []).find(x => x.name === 'customer-' + username);
  if (!r) throw new Error('Created role not found: customer-' + username);
  finalRoleId = r.id;
  actions.push('create_role');
}

// 4b. ensure user exists / update; always re-enable on active
if (!finalUserId) {
  await alistReq(ctx, 'POST', '/api/admin/user/create', {
    username,
    password: cust.password,
    base_path: '/',
    role: finalRoleId ? [finalRoleId] : [],
    permission: 16384,
  }, token);
  const users = await alistReq(ctx, 'GET', '/api/admin/user/list?page=1&per_page=100', null, token);
  const u = (users?.data?.content || []).find(x => x.username === username);
  if (!u) throw new Error('Created user not found: ' + username);
  finalUserId = u.id;
  actions.push('create_user');
} else {
  await alistReq(ctx, 'POST', '/api/admin/user/update', {
    id: finalUserId,
    username,
    password: cust.password,
    base_path: '/',
    role: finalRoleId ? [finalRoleId] : [],
    permission: 16384,
    disabled: false,
  }, token);
  actions.push('update_user');
}

// 4c. RECOMPUTE desired scopes (never restore stale) and write them
const g = await calculateEffectiveGrants(ctx, customerId);
await alistReq(ctx, 'POST', '/api/admin/role/update', {
  id: finalRoleId,
  name: 'customer-' + username,
  description: 'Auto role for ' + username,
  permission_scopes: g.newScopes,
}, token);
actions.push('apply_grants');

// 5. write-back ids + sync_status + clear sync_required (value-change guarded).
//    The echo re-entry sees businessChanged()===false -> skip_writeback_echo.
await writeBack({
  alist_user_id: alistUserId || finalUserId,
  alist_role_id: alistRoleId || finalRoleId,
  sync_status: 'synced',
  sync_required: false,
  last_sync_error: null,
});

return { json: {
  customerId, username, status, lifecycle: 'active_provision',
  alistUserId: finalUserId, alistRoleId: finalRoleId,
  desiredPaths: g.desiredPaths, actions,
} };