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import { SingleComment } from '@ts/types/app';
import { GraphQLEdgesInput } from '@ts/types/graphql/generics';
import { SendCommentInput, SentComment } from '@ts/types/graphql/mutations';
import { ContentId } from '@ts/types/graphql/queries';
import { RawComment, RawCommentsPage } from '@ts/types/raw-data';
import { getAuthorFromRawData } from '@utils/helpers/author';
import { fetchAPI } from './api';
import { sendCommentMutation } from './comments.mutation';
import { commentsQuery } from './comments.query';
/**
* Convert a comment from RawComment type to SingleComment type.
*
* @param {RawComment} comment - A raw comment.
* @returns {SingleComment} A formatted comment.
*/
export const getCommentFromRawData = (comment: RawComment): SingleComment => {
const { author, databaseId, date, parentDatabaseId, ...data } = comment;
return {
id: databaseId,
meta: {
author: getAuthorFromRawData(author.node, 'comment'),
date,
},
parentId: parentDatabaseId === 0 ? undefined : parentDatabaseId,
replies: [],
...data,
};
};
/**
* Convert an array of RawComment type to an array of SingleComment type.
*
* @param {RawComment[]} comments - The raw comments.
* @returns {SingleComment[]} The formatted comments.
*/
export const getCommentsFromRawData = (
comments: RawComment[]
): SingleComment[] => {
return comments.map((comment) => getCommentFromRawData(comment));
};
/**
* Create a comments tree with replies.
*
* @param {SingleComment[]} comments - A flatten comments list.
* @returns {SingleComment[]} An array of comments with replies.
*/
export const buildCommentsTree = (
comments: SingleComment[]
): SingleComment[] => {
type CommentsHashTable = {
[key: string]: SingleComment;
};
const hashTable: CommentsHashTable = Object.create(null);
const commentsTree: SingleComment[] = [];
comments.forEach(
(comment) => (hashTable[comment.id] = { ...comment, replies: [] })
);
comments.forEach((comment) => {
if (!comment.parentId) {
commentsTree.push(hashTable[comment.id]);
} else {
hashTable[comment.parentId].replies.push(hashTable[comment.id]);
}
});
return commentsTree;
};
type FetchCommentsInput = ContentId &
Pick<GraphQLEdgesInput, 'after' | 'first'>;
/**
* Retrieve a raw comments page from GraphQL.
*
* @param {FetchCommentsInput} variables - An object of variables.
* @returns {Promise<RawCommentsPage>} A raw comments page.
*/
export const fetchRawComments = async (
variables: FetchCommentsInput
): Promise<RawCommentsPage> => {
const response = await fetchAPI<RawComment, typeof commentsQuery>({
query: commentsQuery,
variables,
});
return {
comments: response.comments.edges.map((edge) => edge.node),
hasNextPage: response.comments.pageInfo.hasNextPage,
endCursor: response.comments.pageInfo.endCursor,
};
};
/**
* Fetch recursively all the comments on a post.
*
* @param {FetchCommentsInput} variables - An object of query variables.
* @param {RawCommentsPage[]} pages - An accumulator to keep track of pages.
* @returns {Promise<RawCommentsPage[]>} The raw comments pages.
*/
export const fetchAllRawCommentsPages = async (
variables: FetchCommentsInput,
pages: RawCommentsPage[] = []
): Promise<RawCommentsPage[]> => {
return fetchRawComments(variables).then((page) => {
pages.push(page);
if (page.hasNextPage) {
return fetchAllRawCommentsPages(
{ ...variables, after: page.endCursor },
pages
);
} else {
return pages;
}
});
};
/**
* Method to compare two comments dates and sort them from older to newest.
*
* @param {SingleComment} a - A comment.
* @param {SingleComment} b - Another comment.
* @returns {number} The difference between dates.
*/
export const compareCommentsDate = (
a: SingleComment,
b: SingleComment
): number => {
return +new Date(a.meta.date) - +new Date(b.meta.date);
};
/**
* Retrieve all the comments on a post.
*
* @param {number} id - A post id.
* @returns {Promise<SingleComment[]>} The comments list.
*/
export const getAllComments = async ({
contentId,
}: {
contentId: number;
}): Promise<SingleComment[]> => {
const pages = await fetchAllRawCommentsPages({ contentId });
const comments = pages
.map((page) => getCommentsFromRawData(page.comments))
.flat()
.sort(compareCommentsDate);
return buildCommentsTree(comments);
};
/**
* Send a comment using GraphQL API.
*
* @param {SendCommentVars} data - The comment data.
* @returns {Promise<SentComment>} The mutation response.
*/
export const sendComment = async (
data: SendCommentInput
): Promise<SentComment> => {
const response = await fetchAPI<SentComment, typeof sendCommentMutation>({
query: sendCommentMutation,
variables: { ...data },
});
return response.createComment;
};
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