// @flow
import { COMMENT_SERVER_API } from 'config';

const Comments = {
  url: COMMENT_SERVER_API,
  enabled: Boolean(COMMENT_SERVER_API),
  isCustomServer: false,

  setServerUrl: (customUrl: ?string) => {
    Comments.url = customUrl === undefined ? COMMENT_SERVER_API : customUrl;
    Comments.enabled = Boolean(Comments.url);
    Comments.isCustomServer = Comments.url !== COMMENT_SERVER_API;
  },

  moderation_block: (params: ModerationBlockParams) => fetchCommentsApi('moderation.Block', params),
  moderation_unblock: (params: ModerationBlockParams) => fetchCommentsApi('moderation.UnBlock', params),
  moderation_block_list: (params: ModerationBlockParams) => fetchCommentsApi('moderation.BlockedList', params),
  moderation_add_delegate: (params: ModerationAddDelegateParams) => fetchCommentsApi('moderation.AddDelegate', params),
  moderation_remove_delegate: (params: ModerationRemoveDelegateParams) =>
    fetchCommentsApi('moderation.RemoveDelegate', params),
  moderation_list_delegates: (params: ModerationListDelegatesParams) =>
    fetchCommentsApi('moderation.ListDelegates', params),
  moderation_am_i: (params: ModerationAmIParams) => fetchCommentsApi('moderation.AmI', params),
  comment_list: (params: CommentListParams) => fetchCommentsApi('comment.List', params),
  comment_abandon: (params: CommentAbandonParams) => fetchCommentsApi('comment.Abandon', params),
  comment_create: (params: CommentCreateParams) => fetchCommentsApi('comment.Create', params),
  comment_by_id: (params: CommentByIdParams) => fetchCommentsApi('comment.ByID', params),
  comment_pin: (params: CommentPinParams) => fetchCommentsApi('comment.Pin', params),
  comment_edit: (params: CommentEditParams) => fetchCommentsApi('comment.Edit', params),
  reaction_list: (params: ReactionListParams) => fetchCommentsApi('reaction.List', params),
  reaction_react: (params: ReactionReactParams) => fetchCommentsApi('reaction.React', params),
  setting_list: (params: SettingsParams) => fetchCommentsApi('setting.List', params),
  setting_block_word: (params: BlockWordParams) => fetchCommentsApi('setting.BlockWord', params),
  setting_unblock_word: (params: BlockWordParams) => fetchCommentsApi('setting.UnBlockWord', params),
  setting_list_blocked_words: (params: SettingsParams) => fetchCommentsApi('setting.ListBlockedWords', params),
  setting_update: (params: UpdateSettingsParams) => fetchCommentsApi('setting.Update', params),
  super_list: (params: SuperListParams) => fetchCommentsApi('comment.SuperChatList', params),
};

function fetchCommentsApi(method: string, params: {}) {
  if (!Comments.url) {
    return Promise.reject(new Error('Commenting server is not set.'));
  } else if (!Comments.enabled) {
    return Promise.reject('Comments are not currently enabled.'); // eslint-disable-line
  }

  const url = `${Comments.url}?m=${method}`;
  const options = {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      jsonrpc: '2.0',
      id: 1,
      method,
      params,
    }),
  };

  return fetch(url, options)
    .then((res) => res.json())
    .then((res) => {
      if (res.error) {
        throw new Error(res.error.message);
      }
      return res.result;
    });
}

export default Comments;