<?php

final class PhabricatorProjectMoveController
  extends PhabricatorProjectController {

  public function handleRequest(AphrontRequest $request) {
    $viewer = $request->getViewer();
    $id = $request->getURIData('id');

    $request->validateCSRF();

    $column_phid = $request->getStr('columnPHID');
    $object_phid = $request->getStr('objectPHID');
    $after_phid = $request->getStr('afterPHID');
    $before_phid = $request->getStr('beforePHID');

    $order = $request->getStr('order');
    if (!strlen($order)) {
      $order = PhabricatorProjectColumnNaturalOrder::ORDERKEY;
    }

    $ordering = PhabricatorProjectColumnOrder::getOrderByKey($order);
    $ordering = id(clone $ordering)
      ->setViewer($viewer);

    $edit_header = null;
    $raw_header = $request->getStr('header');
    if (strlen($raw_header)) {
      $edit_header = phutil_json_decode($raw_header);
    } else {
      $edit_header = array();
    }

    $project = id(new PhabricatorProjectQuery())
      ->setViewer($viewer)
      ->requireCapabilities(
        array(
          PhabricatorPolicyCapability::CAN_VIEW,
        ))
      ->withIDs(array($id))
      ->executeOne();
    if (!$project) {
      return new Aphront404Response();
    }

    $cancel_uri = $this->getApplicationURI(
      new PhutilURI(
        urisprintf('board/%d/', $project->getID()),
        array(
          'order' => $order,
        )));

    $board_phid = $project->getPHID();

    $object = id(new ManiphestTaskQuery())
      ->setViewer($viewer)
      ->withPHIDs(array($object_phid))
      ->needProjectPHIDs(true)
      ->requireCapabilities(
        array(
          PhabricatorPolicyCapability::CAN_VIEW,
          PhabricatorPolicyCapability::CAN_EDIT,
        ))
      ->executeOne();

    if (!$object) {
      return new Aphront404Response();
    }

    $columns = id(new PhabricatorProjectColumnQuery())
      ->setViewer($viewer)
      ->withProjectPHIDs(array($project->getPHID()))
      ->execute();

    $columns = mpull($columns, null, 'getPHID');
    $column = idx($columns, $column_phid);
    if (!$column) {
      // User is trying to drop this object into a nonexistent column, just kick
      // them out.
      return new Aphront404Response();
    }

    $engine = id(new PhabricatorBoardLayoutEngine())
      ->setViewer($viewer)
      ->setBoardPHIDs(array($board_phid))
      ->setObjectPHIDs(array($object_phid))
      ->executeLayout();

    $order_params = array();
    if ($after_phid) {
      $order_params['afterPHID'] = $after_phid;
    } else if ($before_phid) {
      $order_params['beforePHID'] = $before_phid;
    }

    $xactions = array();
    $xactions[] = id(new ManiphestTransaction())
      ->setTransactionType(PhabricatorTransactions::TYPE_COLUMNS)
      ->setNewValue(
        array(
          array(
            'columnPHID' => $column->getPHID(),
          ) + $order_params,
        ));

    $header_xactions = $ordering->getColumnTransactions(
      $object,
      $edit_header);
    foreach ($header_xactions as $header_xaction) {
      $xactions[] = $header_xaction;
    }

    $editor = id(new ManiphestTransactionEditor())
      ->setActor($viewer)
      ->setContinueOnMissingFields(true)
      ->setContinueOnNoEffect(true)
      ->setContentSourceFromRequest($request)
      ->setCancelURI($cancel_uri);

    $editor->applyTransactions($object, $xactions);

    return $this->newCardResponse($board_phid, $object_phid, $ordering);
  }

}