<?php

final class HeraldNewController extends HeraldController {

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

    $content_type_map = HeraldAdapter::getEnabledAdapterMap($viewer);
    $rule_type_map = HeraldRuleTypeConfig::getRuleTypeMap();

    $errors = array();

    $e_type = null;
    $e_rule = null;
    $e_object = null;

    $step = $request->getInt('step');
    if ($request->isFormPost()) {
      $content_type = $request->getStr('content_type');
      if (empty($content_type_map[$content_type])) {
        $errors[] = pht('You must choose a content type for this rule.');
        $e_type = pht('Required');
        $step = 0;
      }

      if (!$errors && $step > 1) {
        $rule_type = $request->getStr('rule_type');
        if (empty($rule_type_map[$rule_type])) {
          $errors[] = pht('You must choose a rule type for this rule.');
          $e_rule = pht('Required');
          $step = 1;
        }
      }

      if (!$errors && $step >= 2) {
        $target_phid = null;
        $object_name = $request->getStr('objectName');
        $done = false;
        if ($rule_type != HeraldRuleTypeConfig::RULE_TYPE_OBJECT) {
          $done = true;
        } else if (strlen($object_name)) {
          $target_object = id(new PhabricatorObjectQuery())
            ->setViewer($viewer)
            ->withNames(array($object_name))
            ->executeOne();
          if ($target_object) {
            $can_edit = PhabricatorPolicyFilter::hasCapability(
              $viewer,
              $target_object,
              PhabricatorPolicyCapability::CAN_EDIT);
            if (!$can_edit) {
              $errors[] = pht(
                'You can not create a rule for that object, because you do '.
                'not have permission to edit it. You can only create rules '.
                'for objects you can edit.');
              $e_object = pht('Not Editable');
              $step = 2;
            } else {
              $adapter = HeraldAdapter::getAdapterForContentType($content_type);
              if (!$adapter->canTriggerOnObject($target_object)) {
                $errors[] = pht(
                  'This object is not of an allowed type for the rule. '.
                  'Rules can only trigger on certain objects.');
                $e_object = pht('Invalid');
                $step = 2;
              } else {
                $target_phid = $target_object->getPHID();
                $done = true;
              }
            }
          } else {
            $errors[] = pht('No object exists by that name.');
            $e_object = pht('Invalid');
            $step = 2;
          }
        } else if ($step > 2) {
          $errors[] = pht(
            'You must choose an object to associate this rule with.');
          $e_object = pht('Required');
          $step = 2;
        }

        if (!$errors && $done) {
          $uri = id(new PhutilURI('edit/'))
            ->setQueryParams(
              array(
                'content_type' => $content_type,
                'rule_type' => $rule_type,
                'targetPHID' => $target_phid,
              ));
          $uri = $this->getApplicationURI($uri);
          return id(new AphrontRedirectResponse())->setURI($uri);
        }
      }
    }

    $content_type = $request->getStr('content_type');
    $rule_type = $request->getStr('rule_type');

    $form = id(new AphrontFormView())
      ->setUser($viewer)
      ->setAction($this->getApplicationURI('new/'));

    switch ($step) {
      case 0:
      default:
        $content_types = $this->renderContentTypeControl(
          $content_type_map,
          $e_type);

        $form
          ->addHiddenInput('step', 1)
          ->appendChild($content_types);

        $cancel_text = null;
        $cancel_uri = $this->getApplicationURI();
        $title = pht('Create Herald Rule');
        break;
      case 1:
        $rule_types = $this->renderRuleTypeControl(
          $rule_type_map,
          $e_rule);

        $form
          ->addHiddenInput('content_type', $content_type)
          ->addHiddenInput('step', 2)
          ->appendChild($rule_types);

        $cancel_text = pht('Back');
        $cancel_uri = id(new PhutilURI('new/'))
          ->setQueryParams(
            array(
              'content_type' => $content_type,
              'step' => 0,
            ));
        $cancel_uri = $this->getApplicationURI($cancel_uri);
        $title = pht('Create Herald Rule: %s',
          idx($content_type_map, $content_type));
        break;
      case 2:
        $adapter = HeraldAdapter::getAdapterForContentType($content_type);
        $form
          ->addHiddenInput('content_type', $content_type)
          ->addHiddenInput('rule_type', $rule_type)
          ->addHiddenInput('step', 3)
          ->appendChild(
            id(new AphrontFormStaticControl())
              ->setLabel(pht('Rule for'))
              ->setValue(
                phutil_tag(
                  'strong',
                  array(),
                  idx($content_type_map, $content_type))))
          ->appendChild(
            id(new AphrontFormStaticControl())
              ->setLabel(pht('Rule Type'))
              ->setValue(
                phutil_tag(
                  'strong',
                  array(),
                  idx($rule_type_map, $rule_type))))
          ->appendRemarkupInstructions(
            pht(
              'Choose the object this rule will act on (for example, enter '.
              '`rX` to act on the `rX` repository, or `#project` to act on '.
              'a project).'))
          ->appendRemarkupInstructions(
            $adapter->explainValidTriggerObjects())
          ->appendChild(
            id(new AphrontFormTextControl())
              ->setName('objectName')
              ->setError($e_object)
              ->setValue($request->getStr('objectName'))
              ->setLabel(pht('Object')));

        $cancel_text = pht('Back');
        $cancel_uri = id(new PhutilURI('new/'))
          ->setQueryParams(
            array(
              'content_type' => $content_type,
              'rule_type' => $rule_type,
              'step' => 1,
            ));
        $cancel_uri = $this->getApplicationURI($cancel_uri);
        $title = pht('Create Herald Rule: %s',
          idx($content_type_map, $content_type));
        break;
    }

    $form
      ->appendChild(
        id(new AphrontFormSubmitControl())
          ->setValue(pht('Continue'))
          ->addCancelButton($cancel_uri, $cancel_text));

    $form_box = id(new PHUIObjectBoxView())
      ->setFormErrors($errors)
      ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
      ->setForm($form);

    $crumbs = $this
      ->buildApplicationCrumbs()
      ->addTextCrumb(pht('Create Rule'))
      ->setBorder(true);

    $header = id(new PHUIHeaderView())
      ->setHeader($title)
      ->setHeaderIcon('fa-plus-square');

    $view = id(new PHUITwoColumnView())
      ->setHeader($header)
      ->setFooter($form_box);

    return $this->newPage()
      ->setTitle($title)
      ->setCrumbs($crumbs)
      ->appendChild(
        array(
          $view,
      ));
  }

  private function renderContentTypeControl(array $content_type_map, $e_type) {
    $request = $this->getRequest();

    $radio = id(new AphrontFormRadioButtonControl())
      ->setLabel(pht('New Rule for'))
      ->setName('content_type')
      ->setValue($request->getStr('content_type'))
      ->setError($e_type);

    foreach ($content_type_map as $value => $name) {
      $adapter = HeraldAdapter::getAdapterForContentType($value);
      $radio->addButton(
        $value,
        $name,
        phutil_escape_html_newlines($adapter->getAdapterContentDescription()));
    }

    return $radio;
  }


  private function renderRuleTypeControl(array $rule_type_map, $e_rule) {
    $request = $this->getRequest();

    // Reorder array to put less powerful rules first.
    $rule_type_map = array_select_keys(
      $rule_type_map,
      array(
        HeraldRuleTypeConfig::RULE_TYPE_PERSONAL,
        HeraldRuleTypeConfig::RULE_TYPE_OBJECT,
        HeraldRuleTypeConfig::RULE_TYPE_GLOBAL,
      )) + $rule_type_map;

    list($can_global, $global_link) = $this->explainApplicationCapability(
      HeraldManageGlobalRulesCapability::CAPABILITY,
      pht('You have permission to create and manage global rules.'),
      pht('You do not have permission to create or manage global rules.'));

    $captions = array(
      HeraldRuleTypeConfig::RULE_TYPE_PERSONAL =>
        pht(
          'Personal rules notify you about events. You own them, but they can '.
          'only affect you. Personal rules only trigger for objects you have '.
          'permission to see.'),
      HeraldRuleTypeConfig::RULE_TYPE_OBJECT =>
        pht(
          'Object rules notify anyone about events. They are bound to an '.
          'object (like a repository) and can only act on that object. You '.
          'must be able to edit an object to create object rules for it. '.
          'Other users who can edit the object can edit its rules.'),
      HeraldRuleTypeConfig::RULE_TYPE_GLOBAL =>
        array(
          pht(
            'Global rules notify anyone about events. Global rules can '.
            'bypass access control policies and act on any object.'),
          $global_link,
        ),
    );

    $radio = id(new AphrontFormRadioButtonControl())
      ->setLabel(pht('Rule Type'))
      ->setName('rule_type')
      ->setValue($request->getStr('rule_type'))
      ->setError($e_rule);

    $adapter = HeraldAdapter::getAdapterForContentType(
      $request->getStr('content_type'));

    foreach ($rule_type_map as $value => $name) {
      $caption = idx($captions, $value);
      $disabled = ($value == HeraldRuleTypeConfig::RULE_TYPE_GLOBAL) &&
                  (!$can_global);

      if (!$adapter->supportsRuleType($value)) {
        $disabled = true;
        $caption = array(
          $caption,
          "\n\n",
          phutil_tag(
            'em',
            array(),
            pht(
              'This rule type is not supported by the selected content type.')),
        );
      }

      $radio->addButton(
        $value,
        $name,
        phutil_escape_html_newlines($caption),
        $disabled ? 'disabled' : null,
        $disabled);
    }

    return $radio;
  }

}
