// This is the built-in review completion condition that
// Reviewable uses by default.

// It checks that all files have been reviewed by at least one
// user and that all discussions have been resolved.  All the
// information about the current review is supplied in a
// predefined `review` variable that will look like the JSON
// structure on the right.  You can edit it here for testing
// how the code will behave in different scenarios.

// You can load other examples from the dropdown menu above.

let reasons = [];  // pieces of the status description
let shortReasons = [];  // pieces of the short status desc.
const summary = review.summary;  // shortcut to summary

const completed =
 !summary.numUnresolvedDiscussions &&
 !summary.numUnreviewedFiles;

if (summary.numUnreviewedFiles) {
 reasons.push(
   (summary.numFiles - summary.numUnreviewedFiles) +
   ' of ' + summary.numFiles + ' files reviewed');
 shortReasons.push(
   summary.numUnreviewedFiles + ' file' +
   (summary.numUnreviewedFiles > 1 ? 's' : '')
 );
} else {
 reasons.push('all files reviewed');
}

if (summary.numUnresolvedDiscussions) {
 reasons.push(
   summary.numUnresolvedDiscussions +
   ' unresolved discussion' +
   (summary.numUnresolvedDiscussions > 1 ? 's' : ''));
 shortReasons.push(
   summary.numUnresolvedDiscussions + ' discussion' +
   (summary.numUnresolvedDiscussions > 1 ? 's' : '')
 );
} else {
 reasons.push('all discussions resolved');
}

let discussionBlockers = _(review.discussions)
   .where({resolved: false})
   .pluck('participants')
   .flatten()
   .where({resolved: false})
   .map(user => _.pick(user, 'username'))
   .value();

let fileBlockers = _(review.files)
   .filter(file => ​_.isEmpty(_​.last(file.revisions).reviewers))
   .map(file => _(file.revisions).findLast(
     rev => !_.isEmpty(rev.reviewers)))
   .compact()
   .pluck('reviewers')
   .flatten()
   .value();

if (!completed && _.some(fileBlockers, user => !user)) {
 fileBlockers =
   fileBlockers.concat(review.pullRequest.assignees);
}

let shortDescription;
if (completed) {
 shortDescription =
   summary.numFiles + ' file' +
   (summary.numFiles > 1 ? 's' : '') + ' reviewed';
} else {
 shortDescription = shortReasons.join(', ') + ' left';
}

return {
 completed,
 description: reasons.join(', '),
 shortDescription,
 pendingReviewers:
   _.uniq(fileBlockers.concat(discussionBlockers), 'username')
};