3 files changed, 183 insertions, 1 deletions
diff --git a/src/services/graphql/api.ts b/src/services/graphql/api.ts
index 171ab23..9f68ddc 100644
--- a/src/services/graphql/api.ts
+++ b/src/services/graphql/api.ts
@@ -6,6 +6,7 @@ import {
   articlesSlugQuery,
   totalArticlesQuery,
 } from './articles.query';
+import { sendCommentMutation } from './comments.mutation';
 import { commentsQuery } from './comments.query';
 import { sendMailMutation } from './contact.mutation';
 import {
@@ -21,7 +22,7 @@ import {
   totalTopicsQuery,
 } from './topics.query';
 
-export type Mutations = typeof sendMailMutation;
+export type Mutations = typeof sendMailMutation | typeof sendCommentMutation;
 
 export type Queries =
   | typeof articlesQuery
@@ -51,6 +52,10 @@ export type CommentsResponse<T> = {
   comments: T;
 };
 
+export type SendCommentResponse<T> = {
+  createComment: T;
+};
+
 export type SendMailResponse<T> = {
   sendEmail: T;
 };
@@ -101,6 +106,7 @@ export type ResponseMap<T> = {
   [articlesQuery]: ArticlesResponse<EdgesResponse<T>>;
   [articlesSlugQuery]: ArticlesResponse<EdgesResponse<T>>;
   [commentsQuery]: CommentsResponse<NodesResponse<T>>;
+  [sendCommentMutation]: SendCommentResponse<T>;
   [sendMailMutation]: SendMailResponse<T>;
   [thematicBySlugQuery]: ThematicResponse<T>;
   [thematicsListQuery]: ThematicsResponse<EdgesResponse<T>>;
@@ -154,10 +160,53 @@ export type SearchVar = {
   search?: string;
 };
 
+export type SendCommentVars = {
+  /**
+   * The author name.
+   */
+  author: string;
+  /**
+   * The author e-mail address.
+   */
+  authorEmail: string;
+  /**
+   * The author website.
+   */
+  authorUrl: string;
+  /**
+   * A mutation id.
+   */
+  clientMutationId: string;
+  /**
+   * A post or page id.
+   */
+  commentOn: number;
+  /**
+   * The comment body.
+   */
+  content: string;
+  /**
+   * The comment parent.
+   */
+  parent?: number;
+};
+
 export type SendMailVars = {
+  /**
+   * The mail body.
+   */
   body: string;
+  /**
+   * A mutation id.
+   */
   clientMutationId: string;
+  /**
+   * The reply to e-mail address.
+   */
   replyTo: string;
+  /**
+   * The mail subject.
+   */
   subject: string;
 };
 
@@ -167,6 +216,7 @@ export type VariablesMap = {
   [articlesQuery]: EdgesVars;
   [articlesSlugQuery]: EdgesVars;
   [commentsQuery]: ByContentIdVar;
+  [sendCommentMutation]: SendCommentVars;
   [sendMailMutation]: SendMailVars;
   [thematicBySlugQuery]: BySlugVar;
   [thematicsListQuery]: EdgesVars;
diff --git a/src/services/graphql/comments.mutation.ts b/src/services/graphql/comments.mutation.ts
new file mode 100644
index 0000000..f52c7e9
--- /dev/null
+++ b/src/services/graphql/comments.mutation.ts
@@ -0,0 +1,30 @@
+/**
+ * Send comment mutation.
+ */
+export const sendCommentMutation = `mutation CreateComment(
+  $author: String!
+  $authorEmail: String!
+  $authorUrl: String!
+  $content: String!
+  $parent: ID = null
+  $commentOn: Int!
+  $clientMutationId: String!
+) {
+  createComment(
+    input: {
+      author: $author
+      authorEmail: $authorEmail
+      authorUrl: $authorUrl
+      content: $content
+      parent: $parent
+      commentOn: $commentOn
+      clientMutationId: $clientMutationId
+    }
+  ) {
+    clientMutationId
+    success
+    comment {
+      approved
+    }
+  }
+}`;
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;
+};