<?php

final class PhabricatorPhabricatorAuthProvider
  extends PhabricatorOAuth2AuthProvider {

  const PROPERTY_PHABRICATOR_NAME = 'oauth2:phabricator:name';
  const PROPERTY_PHABRICATOR_URI  = 'oauth2:phabricator:uri';

  public function getProviderName() {
    return pht('Phabricator');
  }

  public function getConfigurationHelp() {
    if ($this->isCreate()) {
      return pht(
        "**Step 1 of 2 - Name Phabricator OAuth Instance**\n\n".
        'Choose a permanent name for the OAuth server instance of '.
        'Phabricator. //This// instance of Phabricator uses this name '.
        'internally to keep track of the OAuth server instance of '.
        'Phabricator, in case the URL changes later.');
    }

    return parent::getConfigurationHelp();
  }
  protected function getProviderConfigurationHelp() {
    $config = $this->getProviderConfig();
    $base_uri = rtrim(
      $config->getProperty(self::PROPERTY_PHABRICATOR_URI), '/');
    $login_uri = PhabricatorEnv::getURI($this->getLoginURI());

    return pht(
      "**Step 2 of 2 - Configure Phabricator OAuth Instance**\n\n".
      "To configure Phabricator OAuth, create a new application here:".
      "\n\n".
      "%s/oauthserver/client/create/".
      "\n\n".
      "When creating your application, use these settings:".
      "\n\n".
      "  - **Redirect URI:** Set this to: `%s`".
      "\n\n".
      "After completing configuration, copy the **Client ID** and ".
      "**Client Secret** to the fields above. (You may need to generate the ".
      "client secret by clicking 'New Secret' first.)",
      $base_uri,
      $login_uri);
  }

  protected function newOAuthAdapter() {
    $config = $this->getProviderConfig();
    return id(new PhutilPhabricatorAuthAdapter())
      ->setAdapterDomain($config->getProviderDomain())
      ->setPhabricatorBaseURI(
        $config->getProperty(self::PROPERTY_PHABRICATOR_URI));
  }

  protected function getLoginIcon() {
    return 'Phabricator';
  }

  private function isCreate() {
    return !$this->getProviderConfig()->getID();
  }

  public function readFormValuesFromProvider() {
    $config = $this->getProviderConfig();
    $uri = $config->getProperty(self::PROPERTY_PHABRICATOR_URI);

    return parent::readFormValuesFromProvider() + array(
      self::PROPERTY_PHABRICATOR_NAME => $this->getProviderDomain(),
      self::PROPERTY_PHABRICATOR_URI  => $uri,
    );
  }

  public function readFormValuesFromRequest(AphrontRequest $request) {
    $is_setup = $this->isCreate();
    if ($is_setup) {
      $parent_values = array();
      $name = $request->getStr(self::PROPERTY_PHABRICATOR_NAME);
    } else {
      $parent_values = parent::readFormValuesFromRequest($request);
      $name = $this->getProviderDomain();
    }

    return $parent_values + array(
      self::PROPERTY_PHABRICATOR_NAME => $name,
      self::PROPERTY_PHABRICATOR_URI =>
        $request->getStr(self::PROPERTY_PHABRICATOR_URI),
    );
  }

  public function processEditForm(
    AphrontRequest $request,
    array $values) {

    $is_setup = $this->isCreate();

    if (!$is_setup) {
      list($errors, $issues, $values) =
        parent::processEditForm($request, $values);
    } else {
      $errors = array();
      $issues = array();
    }

    $key_name = self::PROPERTY_PHABRICATOR_NAME;
    $key_uri = self::PROPERTY_PHABRICATOR_URI;

    if (!strlen($values[$key_name])) {
      $errors[] = pht('Phabricator instance name is required.');
      $issues[$key_name] = pht('Required');
    } else if (!preg_match('/^[a-z0-9.]+\z/', $values[$key_name])) {
      $errors[] = pht(
        'Phabricator instance name must contain only lowercase letters, '.
        'digits, and periods.');
      $issues[$key_name] = pht('Invalid');
    }

    if (!strlen($values[$key_uri])) {
      $errors[] = pht('Phabricator base URI is required.');
      $issues[$key_uri] = pht('Required');
    } else {
      $uri = new PhutilURI($values[$key_uri]);
      if (!$uri->getProtocol()) {
        $errors[] = pht(
          'Phabricator base URI should include protocol (like "%s").',
          'https://');
        $issues[$key_uri] = pht('Invalid');
      }
    }

    if (!$errors && $is_setup) {
      $config = $this->getProviderConfig();

      $config->setProviderDomain($values[$key_name]);
    }

    return array($errors, $issues, $values);
  }

  public function extendEditForm(
    AphrontRequest $request,
    AphrontFormView $form,
    array $values,
    array $issues) {

    $is_setup = $this->isCreate();

    $e_required = $request->isFormPost() ? null : true;

    $v_name = $values[self::PROPERTY_PHABRICATOR_NAME];
    if ($is_setup) {
      $e_name = idx($issues, self::PROPERTY_PHABRICATOR_NAME, $e_required);
    } else {
      $e_name = null;
    }

    $v_uri = $values[self::PROPERTY_PHABRICATOR_URI];
    $e_uri = idx($issues, self::PROPERTY_PHABRICATOR_URI, $e_required);

    if ($is_setup) {
      $form
       ->appendChild(
          id(new AphrontFormTextControl())
            ->setLabel(pht('Phabricator Instance Name'))
            ->setValue($v_name)
            ->setName(self::PROPERTY_PHABRICATOR_NAME)
            ->setError($e_name)
            ->setCaption(pht(
            'Use lowercase letters, digits, and periods. For example: %s',
            phutil_tag(
              'tt',
              array(),
              '`phabricator.oauthserver`'))));
    } else {
      $form
        ->appendChild(
          id(new AphrontFormStaticControl())
            ->setLabel(pht('Phabricator Instance Name'))
            ->setValue($v_name));
    }

    $form
      ->appendChild(
        id(new AphrontFormTextControl())
          ->setLabel(pht('Phabricator Base URI'))
          ->setValue($v_uri)
          ->setName(self::PROPERTY_PHABRICATOR_URI)
          ->setCaption(
            pht(
              'The URI where the OAuth server instance of Phabricator is '.
              'installed. For example: %s',
              phutil_tag('tt', array(), 'https://phabricator.mycompany.com/')))
          ->setError($e_uri));

    if (!$is_setup) {
      parent::extendEditForm($request, $form, $values, $issues);
    }
  }

  public function hasSetupStep() {
    return true;
  }

  public function getPhabricatorURI() {
    $config = $this->getProviderConfig();
    return $config->getProperty(self::PROPERTY_PHABRICATOR_URI);
  }

}