<?php

abstract class DifferentialConduitAPIMethod extends ConduitAPIMethod {

  final public function getApplication() {
    return PhabricatorApplication::getByClass(
      'PhabricatorDifferentialApplication');
  }

  protected function buildDiffInfoDictionary(DifferentialDiff $diff) {
    $uri = '/differential/diff/'.$diff->getID().'/';
    $uri = PhabricatorEnv::getProductionURI($uri);

    return array(
      'id'   => $diff->getID(),
      'phid' => $diff->getPHID(),
      'uri'  => $uri,
    );
  }

  protected function buildInlineInfoDictionary(
    DifferentialInlineComment $inline,
    DifferentialChangeset $changeset = null) {

    $file_path = null;
    $diff_id = null;
    if ($changeset) {
      $file_path = $inline->getIsNewFile()
        ? $changeset->getFilename()
        : $changeset->getOldFile();

      $diff_id = $changeset->getDiffID();
    }

    return array(
      'id'          => $inline->getID(),
      'authorPHID'  => $inline->getAuthorPHID(),
      'filePath'    => $file_path,
      'isNewFile'   => $inline->getIsNewFile(),
      'lineNumber'  => $inline->getLineNumber(),
      'lineLength'  => $inline->getLineLength(),
      'diffID'      => $diff_id,
      'content'     => $inline->getContent(),
    );
  }

  protected function applyFieldEdit(
    ConduitAPIRequest $request,
    DifferentialRevision $revision,
    DifferentialDiff $diff,
    array $fields,
    $message) {

    $viewer = $request->getUser();

    // We're going to build the body of a "differential.revision.edit" API
    // request, then just call that code directly.

    $xactions = array();
    $xactions[] = array(
      'type' => DifferentialRevisionEditEngine::KEY_UPDATE,
      'value' => $diff->getPHID(),
    );

    $field_map = DifferentialCommitMessageField::newEnabledFields($viewer);
    $values = $request->getValue('fields', array());
    foreach ($values as $key => $value) {
      $field = idx($field_map, $key);
      if (!$field) {
        // NOTE: We're just ignoring fields we don't know about. This isn't
        // ideal, but the way the workflow currently works involves us getting
        // several read-only fields, like the revision ID field, which we should
        // just skip.
        continue;
      }

      // The transaction itself will be validated so this is somewhat
      // redundant, but this validator will sometimes give us a better error
      // message or a better reaction to a bad value type.
      $value = $field->readFieldValueFromConduit($value);

      foreach ($field->getFieldTransactions($value) as $xaction) {
        $xactions[] = $xaction;
      }
    }

    $message = $request->getValue('message');
    if (strlen($message)) {
      // This is a little awkward, and should move elsewhere or be removed. It
      // largely exists for legacy reasons. See some discussion in T7899.
      $first_line = head(phutil_split_lines($message, false));

      $first_line = id(new PhutilUTF8StringTruncator())
        ->setMaximumBytes(250)
        ->setMaximumGlyphs(80)
        ->truncateString($first_line);

      $diff->setDescription($first_line);
      $diff->save();

      $xactions[] = array(
        'type' => PhabricatorCommentEditEngineExtension::EDITKEY,
        'value' => $message,
      );
    }

    $method = 'differential.revision.edit';
    $params = array(
      'transactions' => $xactions,
    );

    if ($revision->getID()) {
      $params['objectIdentifier'] = $revision->getID();
    }

    return id(new ConduitCall($method, $params, $strict = true))
      ->setUser($viewer)
      ->execute();
  }

  protected function loadCustomFieldsForRevisions(
    PhabricatorUser $viewer,
    array $revisions) {
    assert_instances_of($revisions, 'DifferentialRevision');

    if (!$revisions) {
      return array();
    }

    $field_lists = array();
    foreach ($revisions as $revision) {
      $revision_phid = $revision->getPHID();

      $field_list = PhabricatorCustomField::getObjectFields(
        $revision,
        PhabricatorCustomField::ROLE_CONDUIT);

      $field_list
        ->setViewer($viewer)
        ->readFieldsFromObject($revision);

      $field_lists[$revision_phid] = $field_list;
    }

    $all_fields = array();
    foreach ($field_lists as $field_list) {
      foreach ($field_list->getFields() as $field) {
        $all_fields[] = $field;
      }
    }

    id(new PhabricatorCustomFieldStorageQuery())
      ->addFields($all_fields)
      ->execute();

    $results = array();
    foreach ($field_lists as $revision_phid => $field_list) {
      $results[$revision_phid] = array();
      foreach ($field_list->getFields() as $field) {
        $field_key = $field->getFieldKeyForConduit();
        $value = $field->getConduitDictionaryValue();
        $results[$revision_phid][$field_key] = $value;
      }
    }

    // For compatibility, fill in these "custom fields" by querying for them
    // efficiently. See T11404 for discussion.

    $legacy_edge_map = array(
      'phabricator:projects' =>
        PhabricatorProjectObjectHasProjectEdgeType::EDGECONST,
      'phabricator:depends-on' =>
        DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST,
    );

    $query = id(new PhabricatorEdgeQuery())
      ->withSourcePHIDs(array_keys($results))
      ->withEdgeTypes($legacy_edge_map);

    $query->execute();

    foreach ($results as $revision_phid => $dict) {
      foreach ($legacy_edge_map as $edge_key => $edge_type) {
        $phid_list = $query->getDestinationPHIDs(
          array($revision_phid),
          array($edge_type));

        $results[$revision_phid][$edge_key] = $phid_list;
      }
    }

    return $results;
  }

}