<?php

/**
 * Expands aggregate mail recipients into their component mailables. For
 * example, a project currently expands into all of its members.
 */
final class PhabricatorMetaMTAMemberQuery extends PhabricatorQuery {

  private $phids = array();
  private $viewer;

  public function setViewer(PhabricatorUser $viewer) {
    $this->viewer = $viewer;
    return $this;
  }

  public function getViewer() {
    return $this->viewer;
  }

  public function withPHIDs(array $phids) {
    $this->phids = $phids;
    return $this;
  }

  public function execute() {
    $phids = array_fuse($this->phids);
    $actors = array();
    $type_map = array();
    foreach ($phids as $phid) {
      $type_map[phid_get_type($phid)][] = $phid;
    }

    // TODO: Generalize this somewhere else.

    $results = array();
    foreach ($type_map as $type => $phids) {
      switch ($type) {
        case PhabricatorProjectPHIDTypeProject::TYPECONST:
          // TODO: For now, project members are always on the "mailing list"
          // implied by the project, but we should differentiate members and
          // subscribers (i.e., allow you to unsubscribe from mail about
          // a project).

          $projects = id(new PhabricatorProjectQuery())
            ->setViewer($this->getViewer())
            ->needMembers(true)
            ->withPHIDs($phids)
            ->execute();

          $projects = mpull($projects, null, 'getPHID');
          foreach ($phids as $phid) {
            $project = idx($projects, $phid);
            if (!$project) {
              $results[$phid] = array();
            } else {
              $results[$phid] = $project->getMemberPHIDs();
            }
          }
          break;
        default:
          break;
      }
    }

    return $results;
  }

}