<?php

/**
 * @group conduit
 */
abstract class ConduitAPI_diffusion_abstractquery_Method
  extends ConduitAPI_diffusion_Method {

  private $diffusionRequest;
  protected function setDiffusionRequest(DiffusionRequest $request) {
    $this->diffusionRequest = $request;
    return $this;
  }
  protected function getDiffusionRequest() {
    return $this->diffusionRequest;
  }

  final public function defineErrorTypes() {
    return $this->defineCustomErrorTypes() +
      array(
        'ERR-UNKNOWN-REPOSITORY-VCS' =>
          pht('Unknown repository VCS type.'),
        'ERR-UNSUPPORTED-VCS' =>
          pht('VCS is not supported for this method.'));
  }
  /**
   * Subclasses should override this to specify custom error types.
   */
  protected function defineCustomErrorTypes() {
    return array();
  }

  final public function defineParamTypes() {
    return $this->defineCustomParamTypes() +
      array(
      'callsign' => 'required string');
  }
  /**
   * Subclasses should override this to specify custom param types.
   */
  protected function defineCustomParamTypes() {
    return array();
  }

  /**
   * Subclasses should override these methods with the proper result for the
   * pertinent version control system, e.g. getGitResult for Git.
   *
   * If the result is not supported for that VCS, do not implement it. e.g.
   * Subversion (SVN) does not support branches.
   */
  protected function getGitResult(ConduitAPIRequest $request) {
    throw new ConduitException('ERR-UNSUPPORTED-VCS');
  }
  protected function getSVNResult(ConduitAPIRequest $request) {
    throw new ConduitException('ERR-UNSUPPORTED-VCS');
  }
  protected function getMercurialResult(ConduitAPIRequest $request) {
    throw new ConduitException('ERR-UNSUPPORTED-VCS');
  }

  /**
   * This method is final because each query will need to construct a
   * @{class:DiffusionRequest} and use it. Consolidating this codepath and
   * enforcing @{method:getDiffusionRequest} works when we need it is good.
   *
   * @{method:getResult} should be overridden by subclasses as necessary, e.g.
   * there is a common operation across all version control systems that
   * should occur after @{method:getResult}, like formatting a timestamp.
   */
  final protected function execute(ConduitAPIRequest $request) {
    $drequest = DiffusionRequest::newFromDictionary(
      array(
        'callsign'  => $request->getValue('callsign'),
      ));
    $this->setDiffusionRequest($drequest);

    return $this->getResult($request);
  }

  protected function getResult(ConduitAPIRequest $request) {
    $drequest = $this->getDiffusionRequest();
    $repository = $drequest->getRepository();
    $result = null;
    switch ($repository->getVersionControlSystem()) {
      case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
        $result = $this->getGitResult($request);
        break;
      case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
        $result = $this->getMercurialResult($request);
        break;
      case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
        $result = $this->getSVNResult($request);
        break;
      default:
        throw new ConduitException('ERR-UNKNOWN-REPOSITORY-VCS');
        break;
    }
    return $result;
  }
}