syntax = "proto3";

package subreddits.v1;

import "subreddits/v1/count.proto";
import "subreddits/v1/create.proto";
import "subreddits/v1/delete.proto";
import "subreddits/v1/exist.proto";
import "subreddits/v1/get.proto";
import "subreddits/v1/list.proto";
import "subreddits/v1/resolve.proto";
import "subreddits/v1/update.proto";

service SubredditsService {
  // CreateSubreddit creates a new subreddit
  //
  // Returns the subreddit name.
  //
  // Returns the following error codes:
  //   - connect.CodeAlreadyExists if subreddit with the same name already exists.
  //   - connect.CodeInvalidArgument if validation failed, e.g. Invalid schedule cron format.
  //   - connect.CodeNotFound if the subreddit does not exist.
  rpc CreateSubreddit(CreateSubredditRequest) returns (CreateSubredditResponse);

  // GetSubreddit returns a subreddit by its name.
  //
  // Returns error with connect.CodeNotFound if subreddit does not exist.
  rpc GetSubreddit(GetSubredditRequest) returns (GetSubredditResponse);

  // ListSubreddits returns a list of subreddits.
  rpc ListSubreddits(ListSubredditsRequest) returns (ListSubredditsResponse);

  // UpdateSubreddit updates a subreddit.
  //
  // Only the fields that are set in the request will be updated.
  //
  // Returns error with connect.CodeNotFound if subreddit does not exist.
  rpc UpdateSubreddit(UpdateSubredditRequest) returns (UpdateSubredditResponse);

  // DeleteSubreddit deletes a subreddit.
  //
  // Returns error with connect.CodeNotFound if subreddit does not exist.
  rpc DeleteSubreddit(DeleteSubredditRequest) returns (DeleteSubredditResponse);

  // ResolveSubredditName resolves the given subreddit name.
  //
  // The returned resolved_name is the name that is actually
  // used in Reddit.
  //
  // Returns error with connect.CodeNotFound if subreddit does not exist.
  // So this rpc endpoint also acts to check subreddit's existence.
  rpc ResolveSubredditName(ResolveSubredditNameRequest) returns (ResolveSubredditNameResponse);

  // Count the existing subreddits using given filter.
  //
  // Default values count all.
  rpc CountSubreddits(CountSubredditsRequest) returns (CountSubredditsResponse);

  // SubredditExists checks if the subreddits already handled in database.
  //
  // THIS ENDPOINT DOES NOT CALL REDDIT API, ONLY DATABASE.
  //
  // Use ResolveSubredditName to check if subreddit actually exists in Reddit.
  rpc SubredditExists(SubredditExistsRequest) returns (SubredditExistsResponse);
}