<?php

final class LegalpadDocument extends LegalpadDAO
  implements
    PhabricatorPolicyInterface,
    PhabricatorSubscribableInterface,
    PhabricatorApplicationTransactionInterface {

  protected $title;
  protected $contributorCount;
  protected $recentContributorPHIDs = array();
  protected $creatorPHID;
  protected $versions;
  protected $documentBodyPHID;
  protected $viewPolicy;
  protected $editPolicy;
  protected $mailKey;

  private $documentBody = self::ATTACHABLE;
  private $contributors = self::ATTACHABLE;
  private $signatures   = self::ATTACHABLE;

  public static function initializeNewDocument(PhabricatorUser $actor) {
    $app = id(new PhabricatorApplicationQuery())
      ->setViewer($actor)
      ->withClasses(array('PhabricatorApplicationLegalpad'))
      ->executeOne();

    $view_policy = $app->getPolicy(LegalpadCapabilityDefaultView::CAPABILITY);
    $edit_policy = $app->getPolicy(LegalpadCapabilityDefaultEdit::CAPABILITY);

    return id(new LegalpadDocument())
      ->setVersions(0)
      ->setCreatorPHID($actor->getPHID())
      ->setContributorCount(0)
      ->setRecentContributorPHIDs(array())
      ->attachSignatures(array())
      ->setViewPolicy($view_policy)
      ->setEditPolicy($edit_policy);
  }

  public function getConfiguration() {
    return array(
      self::CONFIG_AUX_PHID => true,
      self::CONFIG_SERIALIZATION => array(
        'recentContributorPHIDs' => self::SERIALIZATION_JSON,
      ),
    ) + parent::getConfiguration();
  }

  public function generatePHID() {
    return PhabricatorPHID::generateNewPHID(
      PhabricatorLegalpadPHIDTypeDocument::TYPECONST);
  }

  public function getDocumentBody() {
    return $this->assertAttached($this->documentBody);
  }

  public function attachDocumentBody(LegalpadDocumentBody $body) {
    $this->documentBody = $body;
    return $this;
  }

  public function getContributors() {
    return $this->assertAttached($this->contributors);
  }

  public function attachContributors(array $contributors) {
    $this->contributors = $contributors;
    return $this;
  }

  public function getSignatures() {
    return $this->assertAttached($this->signatures);
  }

  public function attachSignatures(array $signatures) {
    $this->signatures = $signatures;
    return $this;
  }

  public function save() {
    if (!$this->getMailKey()) {
      $this->setMailKey(Filesystem::readRandomCharacters(20));
    }
    return parent::save();
  }

  public function getMonogram() {
    return 'L'.$this->getID();
  }


/* -(  PhabricatorSubscribableInterface  )----------------------------------- */


  public function isAutomaticallySubscribed($phid) {
    return ($this->creatorPHID == $phid);
  }

  public function shouldShowSubscribersProperty() {
    return true;
  }

  public function shouldAllowSubscription($phid) {
    return true;
  }


/* -(  PhabricatorPolicyInterface  )----------------------------------------- */


  public function getCapabilities() {
    return array(
      PhabricatorPolicyCapability::CAN_VIEW,
      PhabricatorPolicyCapability::CAN_EDIT,
    );
  }

  public function getPolicy($capability) {
    switch ($capability) {
      case PhabricatorPolicyCapability::CAN_VIEW:
        $policy = $this->viewPolicy;
        break;
      case PhabricatorPolicyCapability::CAN_EDIT:
        $policy = $this->editPolicy;
        break;
      default:
        $policy = PhabricatorPolicies::POLICY_NOONE;
        break;
    }
    return $policy;
  }

  public function hasAutomaticCapability($capability, PhabricatorUser $user) {
    return ($user->getPHID() == $this->getCreatorPHID());
  }

  public function describeAutomaticCapability($capability) {
    return pht(
      'The author of a document can always view and edit it.');
  }


/* -(  PhabricatorApplicationTransactionInterface  )------------------------- */

  public function getApplicationTransactionEditor() {
    return new LegalpadDocumentEditor();
  }

  public function getApplicationTransactionObject() {
    return new LegalpadTransaction();
  }

}