From f4c7ab4e306d2f04324853e67032d370abd65d0c Mon Sep 17 00:00:00 2001
From: Armand Philippot <git@armandphilippot.com>
Date: Fri, 20 May 2022 15:37:08 +0200
Subject: chore: handle blog pagination when JS is disabled

---
 src/services/graphql/api.ts            |  9 +++++++++
 src/services/graphql/articles.query.ts | 12 ++++++++++++
 src/services/graphql/articles.ts       | 28 +++++++++++++++++++++++++++-
 3 files changed, 48 insertions(+), 1 deletion(-)

(limited to 'src/services/graphql')

diff --git a/src/services/graphql/api.ts b/src/services/graphql/api.ts
index 9f68ddc..009aea4 100644
--- a/src/services/graphql/api.ts
+++ b/src/services/graphql/api.ts
@@ -2,6 +2,7 @@ import { settings } from '@utils/config';
 import {
   articleBySlugQuery,
   articlesCardQuery,
+  articlesEndCursor,
   articlesQuery,
   articlesSlugQuery,
   totalArticlesQuery,
@@ -28,6 +29,7 @@ export type Queries =
   | typeof articlesQuery
   | typeof articleBySlugQuery
   | typeof articlesCardQuery
+  | typeof articlesEndCursor
   | typeof articlesSlugQuery
   | typeof commentsQuery
   | typeof thematicBySlugQuery
@@ -100,9 +102,15 @@ export type NodesResponse<T> = {
   nodes: T[];
 };
 
+export type EndCursor = Pick<
+  EdgesResponse<Pick<PageInfo, 'endCursor'>>,
+  'pageInfo'
+>;
+
 export type ResponseMap<T> = {
   [articleBySlugQuery]: ArticleResponse<T>;
   [articlesCardQuery]: ArticlesResponse<NodesResponse<T>>;
+  [articlesEndCursor]: ArticlesResponse<EndCursor>;
   [articlesQuery]: ArticlesResponse<EdgesResponse<T>>;
   [articlesSlugQuery]: ArticlesResponse<EdgesResponse<T>>;
   [commentsQuery]: CommentsResponse<NodesResponse<T>>;
@@ -213,6 +221,7 @@ export type SendMailVars = {
 export type VariablesMap = {
   [articleBySlugQuery]: BySlugVar;
   [articlesCardQuery]: EdgesVars;
+  [articlesEndCursor]: EdgesVars;
   [articlesQuery]: EdgesVars;
   [articlesSlugQuery]: EdgesVars;
   [commentsQuery]: ByContentIdVar;
diff --git a/src/services/graphql/articles.query.ts b/src/services/graphql/articles.query.ts
index e02ca8e..7bd0901 100644
--- a/src/services/graphql/articles.query.ts
+++ b/src/services/graphql/articles.query.ts
@@ -184,3 +184,15 @@ export const totalArticlesQuery = `query PostsTotal($search: String = "") {
     }
   }
 }`;
+
+/**
+ * Query the end cursor based on the queried posts number.
+ */
+export const articlesEndCursor = `query EndCursorAfter($first: Int) {
+  posts(first: $first) {
+    pageInfo {
+      hasNextPage
+      endCursor
+    }
+  }
+}`;
diff --git a/src/services/graphql/articles.ts b/src/services/graphql/articles.ts
index 41052c4..f130872 100644
--- a/src/services/graphql/articles.ts
+++ b/src/services/graphql/articles.ts
@@ -7,10 +7,18 @@ import {
 import { getAuthorFromRawData } from '@utils/helpers/author';
 import { getImageFromRawData } from '@utils/helpers/images';
 import { getPageLinkFromRawData } from '@utils/helpers/pages';
-import { EdgesResponse, EdgesVars, fetchAPI, getAPIUrl, PageInfo } from './api';
+import {
+  EdgesResponse,
+  EdgesVars,
+  EndCursor,
+  fetchAPI,
+  getAPIUrl,
+  PageInfo,
+} from './api';
 import {
   articleBySlugQuery,
   articlesCardQuery,
+  articlesEndCursor,
   articlesQuery,
   articlesSlugQuery,
   totalArticlesQuery,
@@ -173,3 +181,21 @@ export const getAllArticlesSlugs = async (): Promise<string[]> => {
 
   return response.posts.edges.map((edge) => edge.node.slug);
 };
+
+/**
+ * Retrieve the last cursor.
+ *
+ * @param {EdgesVars} props - An object of GraphQL variables.
+ * @returns {Promise<string>} - The end cursor.
+ */
+export const getArticlesEndCursor = async (
+  props: EdgesVars
+): Promise<string> => {
+  const response = await fetchAPI<EndCursor, typeof articlesEndCursor>({
+    api: getAPIUrl(),
+    query: articlesEndCursor,
+    variables: { ...props },
+  });
+
+  return response.posts.pageInfo.endCursor;
+};
-- 
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