<?php

final class PhabricatorConfigEditController
  extends PhabricatorConfigController {

  private $key;

  public function willProcessRequest(array $data) {
    $this->key = $data['key'];
  }

  public function processRequest() {
    $request = $this->getRequest();
    $user = $request->getUser();


    $options = PhabricatorApplicationConfigOptions::loadAllOptions();
    if (empty($options[$this->key])) {
      // This may be a dead config entry, which existed in the past but no
      // longer exists. Allow it to be edited so it can be reviewed and
      // deleted.
      $option = id(new PhabricatorConfigOption())
        ->setKey($this->key)
        ->setType('wild')
        ->setDefault(null)
        ->setDescription(
          pht(
            "This configuration option is unknown. It may be misspelled, ".
            "or have existed in a previous version of Phabricator."));
      $group = null;
      $group_uri = $this->getApplicationURI();
    } else {
      $option = $options[$this->key];
      $group = $option->getGroup();
      $group_uri = $this->getApplicationURI('group/'.$group->getKey().'/');
    }

    $issue = $request->getStr('issue');
    if ($issue) {
      // If the user came here from an open setup issue, send them back.
      $done_uri = $this->getApplicationURI('issue/'.$issue.'/');
    } else {
      $done_uri = $group_uri;
    }

    // Check if the config key is already stored in the database.
    // Grab the value if it is.
    $config_entry = id(new PhabricatorConfigEntry())
      ->loadOneWhere(
        'configKey = %s AND namespace = %s',
        $this->key,
        'default');
    if (!$config_entry) {
      $config_entry = id(new PhabricatorConfigEntry())
        ->setConfigKey($this->key)
        ->setNamespace('default')
        ->setIsDeleted(true);
    }

    $e_value = null;
    $errors = array();
    if ($request->isFormPost() && !$option->getLocked()) {

      $result = $this->readRequest(
        $option,
        $request);

      list($e_value, $value_errors, $display_value, $xaction) = $result;
      $errors = array_merge($errors, $value_errors);

      if (!$errors) {

        $editor = id(new PhabricatorConfigEditor())
          ->setActor($user)
          ->setContinueOnNoEffect(true)
          ->setContentSource(
            PhabricatorContentSource::newForSource(
              PhabricatorContentSource::SOURCE_WEB,
              array(
                'ip' => $request->getRemoteAddr(),
              )));

        try {
          $editor->applyTransactions($config_entry, array($xaction));
          return id(new AphrontRedirectResponse())->setURI($done_uri);
        } catch (PhabricatorConfigValidationException $ex) {
          $e_value = pht('Invalid');
          $errors[] = $ex->getMessage();
        }
      }
    } else {
      $display_value = $this->getDisplayValue($option, $config_entry);
    }

    $form = new AphrontFormView();
    $form->setFlexible(true);

    $error_view = null;
    if ($errors) {
      $error_view = id(new AphrontErrorView())
        ->setTitle(pht('You broke everything!'))
        ->setErrors($errors);
    } else if ($option->getHidden()) {
      $msg = pht(
        "This configuration is hidden and can not be edited or viewed from ".
        "the web interface.");

      $error_view = id(new AphrontErrorView())
        ->setTitle(pht('Configuration Hidden'))
        ->setSeverity(AphrontErrorView::SEVERITY_WARNING)
        ->appendChild('<p>'.phutil_escape_html($msg).'</p>');
    } else if ($option->getLocked()) {
      $msg = pht(
        "This configuration is locked and can not be edited from the web ".
        "interface.");

      $error_view = id(new AphrontErrorView())
        ->setTitle(pht('Configuration Locked'))
        ->setSeverity(AphrontErrorView::SEVERITY_NOTICE)
        ->appendChild('<p>'.phutil_escape_html($msg).'</p>');
    }

    if ($option->getHidden()) {
      $control = null;
    } else {
      $control = $this->renderControl(
        $option,
        $display_value,
        $e_value);
    }

    $engine = new PhabricatorMarkupEngine();
    $engine->addObject($option, 'description');
    $engine->process();
    $description = phutil_render_tag(
      'div',
      array(
        'class' => 'phabricator-remarkup',
      ),
      $engine->getOutput($option, 'description'));

    $form
      ->setUser($user)
      ->addHiddenInput('issue', $request->getStr('issue'))
      ->appendChild(
        id(new AphrontFormMarkupControl())
          ->setLabel(pht('Description'))
          ->setValue($description))
      ->appendChild($control);

    $submit_control = id(new AphrontFormSubmitControl())
      ->addCancelButton($done_uri);

    if (!$option->getLocked()) {
      $submit_control->setValue(pht('Save Config Entry'));
    }

    $form->appendChild($submit_control);

    $examples = $this->renderExamples($option);
    if ($examples) {
      $form->appendChild(
        id(new AphrontFormMarkupControl())
          ->setLabel(pht('Examples'))
          ->setValue($examples));
    }

    if (!$option->getHidden()) {
      $form->appendChild(
        id(new AphrontFormMarkupControl())
          ->setLabel(pht('Default'))
          ->setValue($this->renderDefaults($option)));
    }

    $title = pht('Edit %s', $this->key);
    $short = pht('Edit');

    $crumbs = $this->buildApplicationCrumbs();
    $crumbs->addCrumb(
      id(new PhabricatorCrumbView())
        ->setName(pht('Config'))
        ->setHref($this->getApplicationURI()));

    if ($group) {
      $crumbs->addCrumb(
        id(new PhabricatorCrumbView())
          ->setName($group->getName())
          ->setHref($group_uri));
    }

    $crumbs->addCrumb(
      id(new PhabricatorCrumbView())
        ->setName($this->key)
        ->setHref('/config/edit/'.$this->key));


    $xactions = id(new PhabricatorConfigTransactionQuery())
      ->withObjectPHIDs(array($config_entry->getPHID()))
      ->setViewer($user)
      ->execute();

    $xaction_view = id(new PhabricatorApplicationTransactionView())
      ->setUser($user)
      ->setTransactions($xactions);

    return $this->buildApplicationPage(
      array(
        $crumbs,
        id(new PhabricatorHeaderView())->setHeader($title),
        $error_view,
        $form,
        $xaction_view,
      ),
      array(
        'title' => $title,
        'device' => true,
      ));
  }

  private function readRequest(
    PhabricatorConfigOption $option,
    AphrontRequest $request) {

    $xaction = new PhabricatorConfigTransaction();
    $xaction->setTransactionType(PhabricatorConfigTransaction::TYPE_EDIT);

    $e_value = null;
    $errors = array();

    $value = $request->getStr('value');
    if (!strlen($value)) {
      $value = null;

      $xaction->setNewValue(
        array(
          'deleted' => true,
          'value'   => null,
        ));

      return array($e_value, $errors, $value, $xaction);
    }

    $type = $option->getType();
    $set_value = null;

    switch ($type) {
      case 'int':
        if (preg_match('/^-?[0-9]+$/', trim($value))) {
          $set_value = (int)$value;
        } else {
          $e_value = pht('Invalid');
          $errors[] = pht('Value must be an integer.');
        }
        break;
      case 'string':
      case 'enum':
        $set_value = (string)$value;
        break;
      case 'list<string>':
        $set_value = $request->getStrList('value');
        break;
      case 'set':
        $set_value = array_fill_keys($request->getStrList('value'), true);
        break;
      case 'bool':
        switch ($value) {
          case 'true':
            $set_value = true;
            break;
          case 'false':
            $set_value = false;
            break;
          default:
            $e_value = pht('Invalid');
            $errors[] = pht('Value must be boolean, "true" or "false".');
            break;
        }
        break;
      case 'class':
        if (!class_exists($value)) {
          $e_value = pht('Invalid');
          $errors[] = pht('Class does not exist.');
        } else {
          $base = $option->getBaseClass();
          if (!is_subclass_of($value, $base)) {
            $e_value = pht('Invalid');
            $errors[] = pht('Class is not of valid type.');
          } else {
            $set_value = $value;
          }
        }
        break;
      default:
        $json = json_decode($value, true);
        if ($json === null && strtolower($value) != 'null') {
          $e_value = pht('Invalid');
          $errors[] = pht(
            'The given value must be valid JSON. This means, among '.
            'other things, that you must wrap strings in double-quotes.');
        } else {
          $set_value = $json;
        }
        break;
    }

    if (!$errors) {
      $xaction->setNewValue(
        array(
          'deleted' => false,
          'value'   => $set_value,
        ));
    } else {
      $xaction = null;
    }

    return array($e_value, $errors, $value, $xaction);
  }

  private function getDisplayValue(
    PhabricatorConfigOption $option,
    PhabricatorConfigEntry $entry) {

    if ($entry->getIsDeleted()) {
      return null;
    }

    $type = $option->getType();
    $value = $entry->getValue();
    switch ($type) {
      case 'int':
      case 'string':
      case 'enum':
        return $value;
      case 'bool':
        return $value ? 'true' : 'false';
      case 'list<string>':
        return implode("\n", nonempty($value, array()));
      case 'set':
        return implode("\n", nonempty(array_keys($value), array()));
      default:
        return PhabricatorConfigJSON::prettyPrintJSON($value);
    }
  }

  private function renderControl(
    PhabricatorConfigOption $option,
    $display_value,
    $e_value) {

    $type = $option->getType();
    switch ($type) {
      case 'int':
      case 'string':
        $control = id(new AphrontFormTextControl());
        break;
      case 'bool':
        $control = id(new AphrontFormSelectControl())
          ->setOptions(
            array(
              ''      => pht('(Use Default)'),
              'true'  => idx($option->getBoolOptions(), 0),
              'false' => idx($option->getBoolOptions(), 1),
            ));
        break;
      case 'enum':
        $options = array_mergev(
          array(
            array('' => pht('(Use Default)')),
            $option->getEnumOptions(),
          ));
        $control = id(new AphrontFormSelectControl())
          ->setOptions($options);
        break;
      case 'class':
        $symbols = id(new PhutilSymbolLoader())
          ->setType('class')
          ->setAncestorClass($option->getBaseClass())
          ->setConcreteOnly(true)
          ->selectSymbolsWithoutLoading();
        $names = ipull($symbols, 'name', 'name');
        asort($names);
        $names = array(
          '' => pht('(Use Default)'),
        ) + $names;

        $control = id(new AphrontFormSelectControl())
          ->setOptions($names);
        break;
      case 'list<string>':
      case 'set':
        $control = id(new AphrontFormTextAreaControl())
          ->setCaption(pht('Separate values with newlines or commas.'));
        break;
      default:
        $control = id(new AphrontFormTextAreaControl())
          ->setHeight(AphrontFormTextAreaControl::HEIGHT_VERY_TALL)
          ->setCustomClass('PhabricatorMonospaced')
          ->setCaption(pht('Enter value in JSON.'));
        break;
    }

    $control
      ->setLabel('Value')
      ->setError($e_value)
      ->setValue($display_value)
      ->setName('value');

    if ($option->getLocked()) {
      $control->setDisabled(true);
    }

    return $control;
  }

  private function renderExamples(PhabricatorConfigOption $option) {
    $examples = $option->getExamples();
    if (!$examples) {
      return null;
    }

    $table = array();
    $table[] = '<tr class="column-labels">';
    $table[] = '<th>'.pht('Example').'</th>';
    $table[] = '<th>'.pht('Value').'</th>';
    $table[] = '</tr>';
    foreach ($examples as $example) {
      list($value, $description) = $example;

      if ($value === null) {
        $value = '<em>'.pht('(empty)').'</em>';
      } else {
        $value = nl2br(phutil_escape_html($value));
      }

      $table[] = '<tr>';
      $table[] = '<th>'.phutil_escape_html($description).'</th>';
      $table[] = '<td>'.$value.'</td>';
      $table[] = '</tr>';
    }

    require_celerity_resource('config-options-css');

    return phutil_render_tag(
      'table',
      array(
        'class' => 'config-option-table',
      ),
      implode("\n", $table));
  }

  private function renderDefaults(PhabricatorConfigOption $option) {
    $stack = PhabricatorEnv::getConfigSourceStack();
    $stack = $stack->getStack();

    /*

      TODO: Once DatabaseSource lands, do this:

      foreach ($stack as $key => $source) {
        unset($stack[$key]);
        if ($source instanceof PhabricatorConfigDatabaseSource) {
          break;
        }
      }

    */


    $table = array();
    $table[] = '<tr class="column-labels">';
    $table[] = '<th>'.pht('Source').'</th>';
    $table[] = '<th>'.pht('Value').'</th>';
    $table[] = '</tr>';
    foreach ($stack as $key => $source) {
      $value = $source->getKeys(
        array(
          $option->getKey(),
        ));

      if (!array_key_exists($option->getKey(), $value)) {
        $value = '<em>'.pht('(empty)').'</em>';
      } else {
        $value = PhabricatorConfigJSON::prettyPrintJSON(
          $value[$option->getKey()]);
      }

      $table[] = '<tr>';
      $table[] = '<th>'.phutil_escape_html($source->getName()).'</th>';
      $table[] = '<td>'.$value.'</td>';
      $table[] = '</tr>';
    }

    require_celerity_resource('config-options-css');

    return phutil_render_tag(
      'table',
      array(
        'class' => 'config-option-table',
      ),
      implode("\n", $table));
  }

}