1 files changed, 102 insertions, 0 deletions
diff --git a/src/services/graphql/comments.ts b/src/services/graphql/comments.ts
new file mode 100644
index 0000000..28ddfd0
--- /dev/null
+++ b/src/services/graphql/comments.ts
@@ -0,0 +1,102 @@
+import { Comment } from '@ts/types/app';
+import { RawComment } from '@ts/types/raw-data';
+import { getAuthorFromRawData } from '@utils/helpers/author';
+import { fetchAPI, getAPIUrl, SendCommentVars } from './api';
+import { sendCommentMutation } from './comments.mutation';
+import { commentsQuery } from './comments.query';
+
+/**
+ * Create a comments tree with replies.
+ *
+ * @param {Comment[]} comments - A flatten comments list.
+ * @returns {Comment[]} An array of comments with replies.
+ */
+export const buildCommentsTree = (comments: Comment[]): Comment[] => {
+  type CommentsHashTable = {
+    [key: string]: Comment;
+  };
+
+  const hashTable: CommentsHashTable = Object.create(null);
+  const commentsTree: Comment[] = [];
+
+  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;
+};
+
+/**
+ * Convert a comment from RawComment to Comment type.
+ *
+ * @param {RawComment} comment - A raw comment.
+ * @returns {Comment} A formatted comment.
+ */
+export const getCommentFromRawData = (comment: RawComment): Comment => {
+  const { author, databaseId, date, parentDatabaseId, ...data } = comment;
+
+  return {
+    id: databaseId,
+    meta: {
+      author: getAuthorFromRawData(author.node, 'comment'),
+      date,
+    },
+    parentId: parentDatabaseId,
+    replies: [],
+    ...data,
+  };
+};
+
+/**
+ * Retrieve a comments list by post id.
+ *
+ * @param {number} id - A post id.
+ * @returns {Promise<Comment[]>} The comments list.
+ */
+export const getPostComments = async (id: number): Promise<Comment[]> => {
+  const response = await fetchAPI<RawComment, typeof commentsQuery>({
+    api: getAPIUrl(),
+    query: commentsQuery,
+    variables: { contentId: id },
+  });
+
+  const comments = response.comments.nodes.map((comment) =>
+    getCommentFromRawData(comment)
+  );
+
+  return buildCommentsTree(comments);
+};
+
+export type SentComment = {
+  clientMutationId: string;
+  success: boolean;
+  comment: {
+    approved: boolean;
+  } | null;
+};
+
+/**
+ * Send a comment using GraphQL API.
+ *
+ * @param {SendCommentVars} data - The comment data.
+ * @returns {Promise<SentEmail>} The mutation response.
+ */
+export const sendComment = async (
+  data: SendCommentVars
+): Promise<SentComment> => {
+  const response = await fetchAPI<SentComment, typeof sendCommentMutation>({
+    api: getAPIUrl(),
+    query: sendCommentMutation,
+    variables: { ...data },
+  });
+
+  return response.createComment;
+};