<?php

/*
 * Copyright 2012 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @group maniphest
 */
final class ManiphestTaskEditController extends ManiphestController {

  private $id;

  public function willProcessRequest(array $data) {
    $this->id = idx($data, 'id');
  }

  public function processRequest() {

    $request = $this->getRequest();
    $user = $request->getUser();

    $files = array();
    $parent_task = null;
    $template_id = null;

    if ($this->id) {
      $task = id(new ManiphestTask())->load($this->id);
      if (!$task) {
        return new Aphront404Response();
      }
    } else {
      $task = new ManiphestTask();
      $task->setPriority(ManiphestTaskPriority::PRIORITY_TRIAGE);
      $task->setAuthorPHID($user->getPHID());

      // These allow task creation with defaults.
      if (!$request->isFormPost()) {
        $task->setTitle($request->getStr('title'));

        $default_projects = $request->getStr('projects');
        if ($default_projects) {
          $task->setProjectPHIDs(explode(';', $default_projects));
        }
      }

      $file_phids = $request->getArr('files', array());
      if (!$file_phids) {
        // Allow a single 'file' key instead, mostly since Mac OS X urlencodes
        // square brackets in URLs when passed to 'open', so you can't 'open'
        // a URL like '?files[]=xyz' and have PHP interpret it correctly.
        $phid = $request->getStr('file');
        if ($phid) {
          $file_phids = array($phid);
        }
      }

      if ($file_phids) {
        $files = id(new PhabricatorFile())->loadAllWhere(
          'phid IN (%Ls)',
          $file_phids);
      }

      $template_id = $request->getInt('template');

      // You can only have a parent task if you're creating a new task.
      $parent_id = $request->getInt('parent');
      if ($parent_id) {
        $parent_task = id(new ManiphestTask())->load($parent_id);
      }
    }

    $errors = array();
    $e_title = true;

    $extensions = ManiphestTaskExtensions::newExtensions();
    $aux_fields = $extensions->getAuxiliaryFieldSpecifications();

    if ($request->isFormPost()) {

      $changes = array();

      $new_title = $request->getStr('title');
      $new_desc = $request->getStr('description');
      $new_status = $request->getStr('status');

      $workflow = '';

      if ($task->getID()) {
        if ($new_title != $task->getTitle()) {
          $changes[ManiphestTransactionType::TYPE_TITLE] = $new_title;
        }
        if ($new_desc != $task->getDescription()) {
          $changes[ManiphestTransactionType::TYPE_DESCRIPTION] = $new_desc;
        }
        if ($new_status != $task->getStatus()) {
          $changes[ManiphestTransactionType::TYPE_STATUS] = $new_status;
        }
      } else {
        $task->setTitle($new_title);
        $task->setDescription($new_desc);
        $changes[ManiphestTransactionType::TYPE_STATUS] =
          ManiphestTaskStatus::STATUS_OPEN;

        $workflow = 'create';
      }

      $owner_tokenizer = $request->getArr('assigned_to');
      $owner_phid = reset($owner_tokenizer);

      if (!strlen($new_title)) {
        $e_title = 'Required';
        $errors[] = 'Title is required.';
      }

      foreach ($aux_fields as $aux_field) {
        $aux_field->setValueFromRequest($request);

        if ($aux_field->isRequired() && !strlen($aux_field->getValue())) {
          $errors[] = $aux_field->getLabel() . ' is required.';
          $aux_field->setError('Required');
        }

        if (strlen($aux_field->getValue())) {
          try {
            $aux_field->validate();
          } catch (Exception $e) {
            $errors[] = $e->getMessage();
            $aux_field->setError('Invalid');
          }
        }
      }

      if ($errors) {
        $task->setPriority($request->getInt('priority'));
        $task->setOwnerPHID($owner_phid);
        $task->setCCPHIDs($request->getArr('cc'));
        $task->setProjectPHIDs($request->getArr('projects'));
      } else {
        if ($request->getInt('priority') != $task->getPriority()) {
          $changes[ManiphestTransactionType::TYPE_PRIORITY] =
            $request->getInt('priority');
        }

        if ($owner_phid != $task->getOwnerPHID()) {
          $changes[ManiphestTransactionType::TYPE_OWNER] = $owner_phid;
        }

        if ($request->getArr('cc') != $task->getCCPHIDs()) {
          $changes[ManiphestTransactionType::TYPE_CCS] = $request->getArr('cc');
        }

        $new_proj_arr = $request->getArr('projects');
        $new_proj_arr = array_values($new_proj_arr);
        sort($new_proj_arr);

        $cur_proj_arr = $task->getProjectPHIDs();
        $cur_proj_arr = array_values($cur_proj_arr);
        sort($cur_proj_arr);

        if ($new_proj_arr != $cur_proj_arr) {
          $changes[ManiphestTransactionType::TYPE_PROJECTS] = $new_proj_arr;
        }

        if ($files) {
          $file_map = mpull($files, 'getPHID');
          $file_map = array_fill_keys($file_map, array());
          $changes[ManiphestTransactionType::TYPE_ATTACH] = array(
            PhabricatorPHIDConstants::PHID_TYPE_FILE => $file_map,
          );
        }

        $content_source = PhabricatorContentSource::newForSource(
          PhabricatorContentSource::SOURCE_WEB,
          array(
            'ip' => $request->getRemoteAddr(),
          ));

        $template = new ManiphestTransaction();
        $template->setAuthorPHID($user->getPHID());
        $template->setContentSource($content_source);
        $transactions = array();

        foreach ($changes as $type => $value) {
          $transaction = clone $template;
          $transaction->setTransactionType($type);
          $transaction->setNewValue($value);
          $transactions[] = $transaction;
        }

        if ($aux_fields) {
          $task->loadAndAttachAuxiliaryAttributes();
          foreach ($aux_fields as $aux_field) {
            $transaction = clone $template;
            $transaction->setTransactionType(
              ManiphestTransactionType::TYPE_AUXILIARY);
            $aux_key = $aux_field->getAuxiliaryKey();
            $transaction->setMetadataValue('aux:key', $aux_key);
            $transaction->setNewValue($aux_field->getValueForStorage());
            $transactions[] = $transaction;
          }
        }

        if ($transactions) {
          $event = new PhabricatorEvent(
            PhabricatorEventType::TYPE_MANIPHEST_WILLEDITTASK,
            array(
              'task'          => $task,
              'new'           => !$task->getID(),
              'transactions'  => $transactions,
            ));
          $event->setUser($user);
          $event->setAphrontRequest($request);
          PhutilEventEngine::dispatchEvent($event);

          $task = $event->getValue('task');
          $transactions = $event->getValue('transactions');

          $editor = new ManiphestTransactionEditor();
          $editor->setAuxiliaryFields($aux_fields);
          $editor->applyTransactions($task, $transactions);
        }

        if ($parent_task) {
          $type_task = PhabricatorPHIDConstants::PHID_TYPE_TASK;

          // NOTE: It's safe to simply apply this transaction without doing
          // cycle detection because we know the new task has no children.
          $new_value = $parent_task->getAttached();
          $new_value[$type_task][$task->getPHID()] = array();

          $parent_xaction = clone $template;
          $attach_type = ManiphestTransactionType::TYPE_ATTACH;
          $parent_xaction->setTransactionType($attach_type);
          $parent_xaction->setNewValue($new_value);

          $editor = new ManiphestTransactionEditor();
          $editor->setAuxiliaryFields($aux_fields);
          $editor->applyTransactions($parent_task, array($parent_xaction));

          $workflow = $parent_task->getID();
        }

        $redirect_uri = '/T'.$task->getID();

        if ($workflow) {
          $redirect_uri .= '?workflow='.$workflow;
        }

        return id(new AphrontRedirectResponse())
          ->setURI($redirect_uri);
      }
    } else {
      if (!$task->getID()) {
        $task->setCCPHIDs(array(
          $user->getPHID(),
        ));
        if ($template_id) {
          $template_task = id(new ManiphestTask())->load($template_id);
          if ($template_task) {
            $task->setCCPHIDs($template_task->getCCPHIDs());
            $task->setProjectPHIDs($template_task->getProjectPHIDs());
            $task->setOwnerPHID($template_task->getOwnerPHID());
          }
        }
      }
    }

    $phids = array_merge(
      array($task->getOwnerPHID()),
      $task->getCCPHIDs(),
      $task->getProjectPHIDs());

    if ($parent_task) {
      $phids[] = $parent_task->getPHID();
    }

    $phids = array_filter($phids);
    $phids = array_unique($phids);

    $handles = id(new PhabricatorObjectHandleData($phids))
      ->loadHandles($phids);

    $tvalues = mpull($handles, 'getFullName', 'getPHID');

    $error_view = null;
    if ($errors) {
      $error_view = new AphrontErrorView();
      $error_view->setErrors($errors);
      $error_view->setTitle('Form Errors');
    }

    $priority_map = ManiphestTaskPriority::getTaskPriorityMap();

    if ($task->getOwnerPHID()) {
      $assigned_value = array(
        $task->getOwnerPHID() => $handles[$task->getOwnerPHID()]->getFullName(),
      );
    } else {
      $assigned_value = array();
    }

    if ($task->getCCPHIDs()) {
      $cc_value = array_select_keys($tvalues, $task->getCCPHIDs());
    } else {
      $cc_value = array();
    }

    if ($task->getProjectPHIDs()) {
      $projects_value = array_select_keys($tvalues, $task->getProjectPHIDs());
    } else {
      $projects_value = array();
    }

    $cancel_id = nonempty($task->getID(), $template_id);
    if ($cancel_id) {
      $cancel_uri = '/T'.$cancel_id;
    } else {
      $cancel_uri = '/maniphest/';
    }

    if ($task->getID()) {
      $button_name = 'Save Task';
      $header_name = 'Edit Task';
    } else if ($parent_task) {
      $cancel_uri = '/T'.$parent_task->getID();
      $button_name = 'Create Task';
      $header_name = 'Create New Subtask';
    } else {
      $button_name = 'Create Task';
      $header_name = 'Create New Task';
    }

    require_celerity_resource('maniphest-task-edit-css');

    $project_tokenizer_id = celerity_generate_unique_node_id();

    $form = new AphrontFormView();
    $form
      ->setUser($user)
      ->setAction($request->getRequestURI()->getPath())
      ->addHiddenInput('template', $template_id);

    if ($parent_task) {
      $form
        ->appendChild(
          id(new AphrontFormStaticControl())
            ->setLabel('Parent Task')
            ->setValue($handles[$parent_task->getPHID()]->getFullName()))
        ->addHiddenInput('parent', $parent_task->getID());
    }

    $form
      ->appendChild(
        id(new AphrontFormTextAreaControl())
          ->setLabel('Title')
          ->setName('title')
          ->setError($e_title)
          ->setHeight(AphrontFormTextAreaControl::HEIGHT_VERY_SHORT)
          ->setValue($task->getTitle()));

    if ($task->getID()) {
      // Only show this in "edit" mode, not "create" mode, since creating a
      // non-open task is kind of silly and it would just clutter up the
      // "create" interface.
      $form
        ->appendChild(
          id(new AphrontFormSelectControl())
            ->setLabel('Status')
            ->setName('status')
            ->setValue($task->getStatus())
            ->setOptions(ManiphestTaskStatus::getTaskStatusMap()));
    }

    $form
      ->appendChild(
        id(new AphrontFormTokenizerControl())
          ->setLabel('Assigned To')
          ->setName('assigned_to')
          ->setValue($assigned_value)
          ->setUser($user)
          ->setDatasource('/typeahead/common/users/')
          ->setLimit(1))
      ->appendChild(
        id(new AphrontFormTokenizerControl())
          ->setLabel('CC')
          ->setName('cc')
          ->setValue($cc_value)
          ->setUser($user)
          ->setDatasource('/typeahead/common/mailable/'))
      ->appendChild(
        id(new AphrontFormSelectControl())
          ->setLabel('Priority')
          ->setName('priority')
          ->setOptions($priority_map)
          ->setValue($task->getPriority()))
      ->appendChild(
        id(new AphrontFormTokenizerControl())
          ->setLabel('Projects')
          ->setName('projects')
          ->setValue($projects_value)
          ->setID($project_tokenizer_id)
          ->setCaption(
            javelin_render_tag(
              'a',
              array(
                'href'        => '/project/create/',
                'mustcapture' => true,
                'sigil'       => 'project-create',
              ),
              'Create New Project'))
          ->setDatasource('/typeahead/common/projects/'));

    if ($aux_fields) {

      if (!$request->isFormPost()) {
        $task->loadAndAttachAuxiliaryAttributes();
        foreach ($aux_fields as $aux_field) {
          $aux_key = $aux_field->getAuxiliaryKey();
          $value = $task->getAuxiliaryAttribute($aux_key);
          $aux_field->setValueFromStorage($value);
        }
      }

      foreach ($aux_fields as $aux_field) {
        if ($aux_field->isRequired() &&
            !$aux_field->getError() &&
            !$aux_field->getValue()) {
          $aux_field->setError(true);
        }

        $aux_control = $aux_field->renderControl();
        $form->appendChild($aux_control);
      }
    }

    require_celerity_resource('aphront-error-view-css');

    Javelin::initBehavior('maniphest-project-create', array(
      'tokenizerID' => $project_tokenizer_id,
    ));

    if ($files) {
      $file_display = array();
      foreach ($files as $file) {
        $file_display[] = phutil_escape_html($file->getName());
      }
      $file_display = implode('<br />', $file_display);

      $form->appendChild(
        id(new AphrontFormMarkupControl())
          ->setLabel('Files')
          ->setValue($file_display));

      foreach ($files as $ii => $file) {
        $form->addHiddenInput('files['.$ii.']', $file->getPHID());
      }
    }

    $email_create = PhabricatorEnv::getEnvConfig(
      'metamta.maniphest.public-create-email');
    $email_hint = null;
    if (!$task->getID() && $email_create) {
      $email_hint = 'You can also create tasks by sending an email to: '.
                    '<tt>'.phutil_escape_html($email_create).'</tt>';
    }

    $panel_id = celerity_generate_unique_node_id();

    $form
      ->appendChild(
        id(new AphrontFormTextAreaControl())
          ->setLabel('Description')
          ->setName('description')
          ->setID('description-textarea')
          ->setCaption($email_hint)
          ->setValue($task->getDescription()));

    if (!$task->getID()) {
      $form
        ->appendChild(
          id(new AphrontFormDragAndDropUploadControl())
            ->setLabel('Attached Files')
            ->setName('files')
            ->setDragAndDropTarget($panel_id)
            ->setActivatedClass('aphront-panel-view-drag-and-drop'));
    }

    $form
      ->appendChild(
        id(new AphrontFormSubmitControl())
          ->addCancelButton($cancel_uri)
          ->setValue($button_name));

    $panel = new AphrontPanelView();
    $panel->setWidth(AphrontPanelView::WIDTH_FULL);
    $panel->setHeader($header_name);
    $panel->setID($panel_id);
    $panel->appendChild($form);

    $description_preview_panel =
      '<div class="aphront-panel-preview aphront-panel-preview-full">
        <div class="maniphest-description-preview-header">
          Description Preview
        </div>
        <div id="description-preview">
          <div class="aphront-panel-preview-loading-text">
            Loading preview...
          </div>
        </div>
      </div>';

    Javelin::initBehavior(
      'maniphest-description-preview',
      array(
        'preview'   => 'description-preview',
        'textarea'  => 'description-textarea',
        'uri'       => '/maniphest/task/descriptionpreview/',
      ));

    return $this->buildStandardPageResponse(
      array(
        $error_view,
        $panel,
        $description_preview_panel
      ),
      array(
        'title' => $header_name,
      ));
  }
}