// The operator's side: signed operations (the two-step challenge), the node's
// settings and roots, members and invitations.
//
// Methods of MeshBayTransport, copied onto its prototype by extendTransport
// (transport.js, which the shell loads first).

extendTransport(class {
  /**
   * Pair this browser with the node using a one-time code (M3, and the same
   * substitution as H3).
   *
   * The node has no way to know which key belongs to its operator unless someone
   * tells it locally — asking the hub would let the hub name itself node
   * administrator. The code comes from `meshbay-node operator pair`, over SSH, and
   * the hub never sees it.
   */
  async pairOperator(userId, code) {
    if (!this._connected) throw new Error('Not connected to the node');
    if (!userId) throw new Error('Missing user id');
    if (!this._sessionKeys || !this._sessionKeys.skEdB64 || !this._sessionKeys.skXB64) {
      throw new Error('Identity keys unavailable in this browser — sign in again');
    }
    if (!this._nonceNode || !this.nodePk) {
      throw new Error('Handshake incomplete — reconnect and retry');
    }

    const C = window.MeshBayCrypto;
    // Both public keys are derived from OUR OWN secret keys, never read back from
    // the hub: signing a public key the directory handed us would reintroduce the
    // substitution this whole mechanism exists to close.
    const pkEdB64 = await _pkEdFromSk(this._sessionKeys.skEdB64);
    const pkXB64 = await _pkFromSk(this._sessionKeys.skXB64);
    const ts = Math.floor(Date.now() / 1000);

    // group_id is empty: operator authority is node-wide, not per group.
    const transcript = C.joinTranscript(
      this.nodePk, '', userId, pkEdB64, pkXB64, this._nonceNode, ts);
    const sig = await window.MeshBayKeys.signBytes(this._sessionKeys.skEdB64, transcript);

    const resp = await this._sendAndWait({
      type: 'join_request',
      v: '0.1',
      group_id: '',
      pk_ed25519: pkEdB64,
      pk_x25519: pkXB64,
      code: code || '',
      ts,
      sig,
    });

    if (resp.type === 'error') throw new Error(resp.detail || 'Pairing refused');
    if (resp.type !== 'join_result' || !resp.ok) {
      const reason = resp.reason || 'unknown';
      const err = new Error(JOIN_REFUSALS[reason] || `Pairing refused: ${reason}`);
      err.reason = reason;
      throw err;
    }
    this.memberRole = 'operator';
    return resp;
  }

  async setAppDirectories(appKey, directories, signFn) {
    const clean = [...new Set(
      (directories || []).map((d) => (d || '').replace(/^\/+|\/+$/g, '')).filter(Boolean),
    )].sort();
    const msg = await this._sendAndWait({
      type: 'app_directories', v: '1.1', app: appKey, directories: clean,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(
        msg, 'app_directories', `${appKey}:${clean.join(',')}`, signFn);
    }
    return msg;
  }

  /**
   * Whether this group's files appear in members' cross-group Search.
   * Presentation only — opening the group lists everything regardless.
   */
  async setSearchListed(listed, signFn) {
    const msg = await this._sendAndWait({
      type: 'search_listed', v: '3.0', listed: Boolean(listed),
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(
        msg, 'search_listed', listed ? 'on' : 'off', signFn);
    }
    return msg;
  }

  /**
   * Authorize a privileged node operation with the user's Ed25519 identity key.
   *
   * The client rebuilds the signed transcript from the challenge fields and refuses
   * to sign unless the operation and subject match what the user actually asked for.
   * Previously the node sent 32 opaque random bytes and the client signed them
   * blind, which let any peer obtain a signature over content of its choosing
   * (finding H5).
   */
  async _authorizeAdminOp(challenge, expectedOp, expectedSubject, signFn) {
    if (challenge.op !== expectedOp || challenge.subject !== expectedSubject) {
      throw new Error(
        `Refusing to sign: node asked to authorize "${challenge.op}" on ` +
        `"${challenge.subject}", but the requested action was "${expectedOp}" ` +
        `on "${expectedSubject}"`);
    }
    if (!signFn) throw new Error('Admin challenge received but no signing key available');

    const transcript = window.MeshBayCrypto.adminTranscript(
      challenge.op, challenge.node_pk, challenge.group_id,
      challenge.subject, challenge.nonce, challenge.ts);

    const signature = await signFn(transcript);
    console.log('[MeshBay] _authorizeAdminOp: signed', challenge.op, 'op_id=', challenge.op_id,
               '— sending admin_response');
    const ack = await this._sendAndWait({
      type: 'admin_response',
      v: '0.1',
      op_id: challenge.op_id,
      signature,
      // Not read by the node (_do_admin_response only looks at op_id and
      // signature) — carried so _sendAndWait can key this reply by op, the
      // same way the admin_challenge that preceded it was keyed. Without
      // it, two admin_response replies in flight together (e.g. one op's
      // app_directories_ack arriving while another's apps_enabled_ack is still
      // pending) are matched by nothing more than arrival order.
      op: challenge.op,
    });
    console.log('[MeshBay] _authorizeAdminOp:', challenge.op, 'admin_response reply =', ack);
    if (ack.type === 'error') throw new Error(ack.detail);
    return ack;
  }

  async deleteFile(fileId, signFn) {
    const msg = await this._sendAndWait({
      type: 'file_delete',
      v: '0.1',
      file_id: fileId,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'file_delete', fileId, signFn);
    }
    return msg;
  }

  /**
   * Remove an empty directory. Operator only, and the node checks that — this
   * signs with the identity it pinned for us, exactly like deleting a file.
   */
  async deleteDirectory(dir, signFn) {
    const msg = await this._sendAndWait({
      type: 'dir_delete',
      v: '0.1',
      dir,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      // `dir`, not msg.subject: comparing the node's answer against itself is
      // no check at all, and the point of this one is that we know what we
      // asked for without being told.
      return this._authorizeAdminOp(msg, 'dir_delete', dir, signFn);
    }
    return msg;
  }

  /**
   * Stop this node serving the group key to someone. Operator only.
   *
   * Only the node can do this: its roster decides who it serves. Removing them
   * on the hub is the other half, and neither implies the other.
   */
  /**
   * Turn a group "application" (Chat, Files, ...) on or off for everyone.
   *
   * Takes the whole set in one signed message rather than one op per app, so
   * ticking several boxes in Settings costs one signature. `apps` is sorted
   * and joined the same way on the node before it is shown for signing —
   * `_authorizeAdminOp` below checks the two match.
   */
  async setAppsEnabled(apps, signFn) {
    // Files cannot be turned off — MNP permits root exploration regardless of
    // this list, so hiding the tab only ever misled — and the node adds it if
    // it is missing. That normalisation has to happen *here too*: the subject
    // below is rebuilt from what this client sent, and compared byte for byte
    // against what the node put in the challenge. A list arriving here without
    // `files` would produce two different strings and `_authorizeAdminOp`
    // would refuse to sign an op the operator did ask for. It is reachable
    // only from a caller that builds the list from something other than the
    // node's own answer, which is exactly the kind of caller a later phase
    // adds. (`apps.js` marks it `alwaysEnabled`; this file is a classic
    // script and cannot import it.)
    const full = apps.includes('files') ? [...apps] : ['files', ...apps];
    const msg = await this._sendAndWait({
      type: 'apps_enabled', v: '0.1', apps: full,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(
        msg, 'apps_enabled', [...full].sort().join(','), signFn);
    }
    return msg;
  }

  /**
   * How often the node's reconciliation backstop runs, and how long it
   * waits after a file's last write before hashing it (indexer.py
   * DirectoryIndexer). Whole seconds only: the node builds the signing
   * subject with Python's `%g` (drops a trailing ".0"), and the simplest
   * way to always match it byte-for-byte from JS is to never send a
   * fractional value in the first place.
   */
  async setScanSettings(reconcileIntervalSecs, debounceSecs, signFn) {
    const reconcile = Math.round(reconcileIntervalSecs);
    const debounce = Math.round(debounceSecs);
    const msg = await this._sendAndWait({
      type: 'set_scan_settings', v: '0.1',
      reconcile_interval_secs: reconcile, debounce_secs: debounce,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(
        msg, 'set_scan_settings', `${reconcile},${debounce}`, signFn);
    }
    return msg;
  }

  async revokeMember(userId, signFn) {
    const msg = await this._sendAndWait({
      type: 'member_revoke', v: '0.1', user_id: userId,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'member_revoke', userId, signFn);
    }
    return msg;
  }

  // ── Node management (D5) ───────────────────────────────────────────────

  async fetchNodeStatus() {
    const msg = await this._sendAndWait({ type: 'node_status', v: '0.1' });
    if (msg.type === 'error') throw new Error(msg.detail);
    return msg;
  }

  async updateNodeSettings(settings) {
    const msg = await this._sendAndWait({
      type: 'node_settings_set', v: '0.1', settings,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    return msg;
  }

  async addRoot(groupId, path, { name, kind, writable, removable } = {}, signFn) {
    const msg = await this._sendAndWait({
      type: 'root_add', v: '1.1',
      group_id: groupId, path,
      name: name || '', kind: kind || 'generic',
      writable: !!writable, removable: !!removable,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'root_add', path, signFn);
    }
    return msg;
  }

  async removeRoot(groupId, rootName, signFn) {
    const msg = await this._sendAndWait({
      type: 'root_remove', v: '0.1',
      group_id: groupId, root_name: rootName,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'root_remove', rootName, signFn);
    }
    return msg;
  }

  async updateRoot(groupId, rootName, { writable, removable } = {}, signFn) {
    const updates = [];
    if (writable !== undefined) updates.push(`rw=${writable ? 'on' : 'off'}`);
    if (removable !== undefined) updates.push(`rem=${removable ? 'on' : 'off'}`);
    const subject = updates.length ? `${rootName}:${updates.join(',')}` : rootName;
    const msg = await this._sendAndWait({
      type: 'root_update', v: '1.1',
      group_id: groupId, root_name: rootName,
      ...(writable !== undefined && { writable }),
      ...(removable !== undefined && { removable }),
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'root_update', subject, signFn);
    }
    return msg;
  }

  async ejectRoot(groupId, rootName, signFn) {
    const msg = await this._sendAndWait({
      type: 'root_eject', v: '1.1',
      group_id: groupId, root_name: rootName,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'root_eject', rootName, signFn);
    }
    return msg;
  }

  async plugRoot(groupId, rootName, signFn) {
    const msg = await this._sendAndWait({
      type: 'root_plug', v: '1.1',
      group_id: groupId, root_name: rootName,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'root_plug', rootName, signFn);
    }
    return msg;
  }

  async unpinMember(userId, signFn) {
    const msg = await this._sendAndWait({
      type: 'member_unpin', v: '0.1', user_id: userId,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'member_unpin', userId, signFn);
    }
    return msg;
  }

  async rotateGek(groupId, signFn) {
    const msg = await this._sendAndWait({
      type: 'gek_rotate', v: '0.1', group_id: groupId,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'gek_rotate', groupId, signFn);
    }
    return msg;
  }

  async fetchRoster(groupId) {
    const msg = await this._sendAndWait({
      type: 'roster_read', v: '0.1', group_id: groupId || '',
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    return msg;
  }

  async fetchDenylist() {
    const msg = await this._sendAndWait({ type: 'denylist_read', v: '0.1' });
    if (msg.type === 'error') throw new Error(msg.detail);
    return msg;
  }

  async clearDenylist(subject) {
    const msg = await this._sendAndWait({
      type: 'denylist_clear', v: '0.1', subject: subject || '',
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    return msg;
  }

  async attachGroup(name, sharedDir, uploadDir, signFn) {
    const msg = await this._sendAndWait({
      type: 'group_attach', v: '0.1',
      name, shared_dir: sharedDir, upload_dir: uploadDir || '',
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'group_attach', name, signFn);
    }
    return msg;
  }

  async detachGroup(name, signFn) {
    const msg = await this._sendAndWait({
      type: 'group_detach', v: '0.1', name,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'group_detach', name, signFn);
    }
    return msg;
  }

  async reloadConfig() {
    const msg = await this._sendAndWait({ type: 'node_reload', v: '0.1' });
    if (msg.type === 'error') throw new Error(msg.detail);
    return msg;
  }

  /**
   * Ask the node for a one-time pairing code admitting `userId` to this group.
   *
   * This replaces wrapping the group key in the browser. We no longer fetch the
   * invitee's public key from the hub, so the hub can no longer answer with its own
   * and be handed the group key (H3). The node wraps the key later, itself, for a
   * key the invitee proves possession of.
   *
   * Returns {code, expires_at} — the code is displayed once and passed to the
   * invitee out of band.
   */
  async createInvite(userId, groupId, username, signFn) {
    const msg = await this._sendAndWait({
      type: 'invite_create',
      v: '0.1',
      user_id: userId,
      group_id: groupId,
      username: username || '',
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'invite_create', userId, signFn);
    }
    return msg;
  }

  /**
   * A code bound to no account, for an invitation link (MNP 3.4). Signed like
   * any invitation, and the subject the operator signs is the outcome: a link
   * into this group, `link:<group>`, and nothing else.
   */
  async createLinkInvite(groupId, signFn) {
    const msg = await this._sendAndWait({
      type: 'invite_link_create', v: '0.1', group_id: groupId,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'invite_link_create', `link:${groupId}`, signFn);
    }
    return msg;
  }

  /** Take back an unredeemed invitation link, by the handle it was issued with. */
  async cancelLinkInvite(inviteId, signFn) {
    const msg = await this._sendAndWait({
      type: 'invite_cancel', v: '0.1', invite_id: inviteId,
    });
    if (msg.type === 'error') throw new Error(msg.detail);
    if (msg.type === 'admin_challenge') {
      return this._authorizeAdminOp(msg, 'invite_cancel', inviteId, signFn);
    }
    return msg;
  }
});