<?php

final class ManiphestTask extends ManiphestDAO
  implements
    PhabricatorMarkupInterface,
    PhabricatorPolicyInterface,
    PhabricatorTokenReceiverInterface,
    PhabricatorFlaggableInterface,
    PhrequentTrackableInterface,
    PhabricatorCustomFieldInterface {

  const MARKUP_FIELD_DESCRIPTION = 'markup:desc';

  protected $authorPHID;
  protected $ownerPHID;
  protected $ccPHIDs = array();

  protected $status;
  protected $priority;
  protected $subpriority = 0;

  protected $title = '';
  protected $originalTitle = '';
  protected $description = '';
  protected $originalEmailSource;
  protected $mailKey;
  protected $viewPolicy = PhabricatorPolicies::POLICY_USER;
  protected $editPolicy = PhabricatorPolicies::POLICY_USER;

  protected $attached = array();
  protected $projectPHIDs = array();
  private $projectsNeedUpdate;
  private $subscribersNeedUpdate;

  protected $ownerOrdering;

  private $groupByProjectPHID = self::ATTACHABLE;
  private $customFields = self::ATTACHABLE;

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

    $view_policy = $app->getPolicy(ManiphestCapabilityDefaultView::CAPABILITY);
    $edit_policy = $app->getPolicy(ManiphestCapabilityDefaultEdit::CAPABILITY);

    return id(new ManiphestTask())
      ->setStatus(ManiphestTaskStatus::getDefaultStatus())
      ->setPriority(ManiphestTaskPriority::getDefaultPriority())
      ->setAuthorPHID($actor->getPHID())
      ->setViewPolicy($view_policy)
      ->setEditPolicy($edit_policy);
  }

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

  public function loadDependsOnTaskPHIDs() {
    return PhabricatorEdgeQuery::loadDestinationPHIDs(
      $this->getPHID(),
      PhabricatorEdgeConfig::TYPE_TASK_DEPENDS_ON_TASK);
  }

  public function loadDependedOnByTaskPHIDs() {
    return PhabricatorEdgeQuery::loadDestinationPHIDs(
      $this->getPHID(),
      PhabricatorEdgeConfig::TYPE_TASK_DEPENDED_ON_BY_TASK);
  }

  public function getAttachedPHIDs($type) {
    return array_keys(idx($this->attached, $type, array()));
  }

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

  public function getCCPHIDs() {
    return array_values(nonempty($this->ccPHIDs, array()));
  }

  public function setProjectPHIDs(array $phids) {
    $this->projectPHIDs = array_values($phids);
    $this->projectsNeedUpdate = true;
    return $this;
  }

  public function getProjectPHIDs() {
    return array_values(nonempty($this->projectPHIDs, array()));
  }

  public function setCCPHIDs(array $phids) {
    $this->ccPHIDs = array_values($phids);
    $this->subscribersNeedUpdate = true;
    return $this;
  }

  public function setOwnerPHID($phid) {
    $this->ownerPHID = nonempty($phid, null);
    $this->subscribersNeedUpdate = true;
    return $this;
  }

  public function setTitle($title) {
    $this->title = $title;
    if (!$this->getID()) {
      $this->originalTitle = $title;
    }
    return $this;
  }

  public function attachGroupByProjectPHID($phid) {
    $this->groupByProjectPHID = $phid;
    return $this;
  }

  public function getGroupByProjectPHID() {
    return $this->assertAttached($this->groupByProjectPHID);
  }

  public function save() {
    if (!$this->mailKey) {
      $this->mailKey = Filesystem::readRandomCharacters(20);
    }

    $result = parent::save();

    if ($this->projectsNeedUpdate) {
      // If we've changed the project PHIDs for this task, update the link
      // table.
      ManiphestTaskProject::updateTaskProjects($this);
      $this->projectsNeedUpdate = false;
    }

    if ($this->subscribersNeedUpdate) {
      // If we've changed the subscriber PHIDs for this task, update the link
      // table.
      ManiphestTaskSubscriber::updateTaskSubscribers($this);
      $this->subscribersNeedUpdate = false;
    }

    return $result;
  }


/* -(  Markup Interface  )--------------------------------------------------- */


  /**
   * @task markup
   */
  public function getMarkupFieldKey($field) {
    $hash = PhabricatorHash::digest($this->getMarkupText($field));
    $id = $this->getID();
    return "maniphest:T{$id}:{$field}:{$hash}";
  }


  /**
   * @task markup
   */
  public function getMarkupText($field) {
    return $this->getDescription();
  }


  /**
   * @task markup
   */
  public function newMarkupEngine($field) {
    return PhabricatorMarkupEngine::newManiphestMarkupEngine();
  }


  /**
   * @task markup
   */
  public function didMarkupText(
    $field,
    $output,
    PhutilMarkupEngine $engine) {
    return $output;
  }


  /**
   * @task markup
   */
  public function shouldUseMarkupCache($field) {
    return (bool)$this->getID();
  }


/* -(  Policy Interface  )--------------------------------------------------- */


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

  public function getPolicy($capability) {
    switch ($capability) {
      case PhabricatorPolicyCapability::CAN_VIEW:
        return $this->getViewPolicy();
      case PhabricatorPolicyCapability::CAN_EDIT:
        return $this->getEditPolicy();
    }
  }

  public function hasAutomaticCapability($capability, PhabricatorUser $user) {

    // The owner of a task can always view and edit it.
    $owner_phid = $this->getOwnerPHID();
    if ($owner_phid) {
      $user_phid = $user->getPHID();
      if ($user_phid == $owner_phid) {
        return true;
      }
    }

    return false;
  }

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


/* -(  PhabricatorTokenReceiverInterface  )---------------------------------- */

  public function getUsersToNotifyOfTokenGiven() {
    // Sort of ambiguous who this was intended for; just let them both know.
    return array_filter(
      array_unique(
        array(
          $this->getAuthorPHID(),
          $this->getOwnerPHID(),
        )));
  }


/* -(  PhabricatorCustomFieldInterface  )------------------------------------ */


  public function getCustomFieldSpecificationForRole($role) {
    return PhabricatorEnv::getEnvConfig('maniphest.fields');
  }

  public function getCustomFieldBaseClass() {
    return 'ManiphestCustomField';
  }

  public function getCustomFields() {
    return $this->assertAttached($this->customFields);
  }

  public function attachCustomFields(PhabricatorCustomFieldAttachment $fields) {
    $this->customFields = $fields;
    return $this;
  }

}