1 files changed, 164 insertions, 0 deletions
diff --git a/src/services/graphql/topics.ts b/src/services/graphql/topics.ts
new file mode 100644
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--- /dev/null
+++ b/src/services/graphql/topics.ts
@@ -0,0 +1,164 @@
+import { PageLink, Slug, Topic } from '@ts/types/app';
+import {
+  RawArticle,
+  RawTopic,
+  RawTopicPreview,
+  TotalItems,
+} from '@ts/types/raw-data';
+import { getImageFromRawData } from '@utils/helpers/images';
+import { getPageLinkFromRawData } from '@utils/helpers/pages';
+import { EdgesResponse, EdgesVars, fetchAPI, getAPIUrl } from './api';
+import { getArticleFromRawData } from './articles';
+import {
+  topicBySlugQuery,
+  topicsListQuery,
+  topicsSlugQuery,
+  totalTopicsQuery,
+} from './topics.query';
+
+/**
+ * Retrieve the total number of topics.
+ *
+ * @returns {Promise<number>} - The topics total number.
+ */
+export const getTotalTopics = async (): Promise<number> => {
+  const response = await fetchAPI<TotalItems, typeof totalTopicsQuery>({
+    api: getAPIUrl(),
+    query: totalTopicsQuery,
+  });
+
+  return response.topics.pageInfo.total;
+};
+
+/**
+ * Retrieve the given number of topics from API.
+ *
+ * @param {EdgesVars} props - An object of GraphQL variables.
+ * @returns {Promise<EdgesResponse<RawTopicPreview>>} The topics data.
+ */
+export const getTopicsPreview = async (
+  props: EdgesVars
+): Promise<EdgesResponse<RawTopicPreview>> => {
+  const response = await fetchAPI<RawTopicPreview, typeof topicsListQuery>({
+    api: getAPIUrl(),
+    query: topicsListQuery,
+    variables: props,
+  });
+
+  return response.topics;
+};
+
+/**
+ * Convert raw data to a Topic object.
+ *
+ * @param {RawTopic} data - The page raw data.
+ * @returns {Topic} The page data.
+ */
+export const getTopicFromRawData = (data: RawTopic): Topic => {
+  const {
+    acfTopics,
+    contentParts,
+    databaseId,
+    date,
+    featuredImage,
+    info,
+    modified,
+    slug,
+    title,
+    seo,
+  } = data;
+
+  /**
+   * Retrieve an array of related topics.
+   *
+   * @param posts - The topic posts.
+   * @returns {PageLink[]} An array of topics links.
+   */
+  const getRelatedThematics = (posts: RawArticle[]): PageLink[] => {
+    const thematics: PageLink[] = [];
+
+    posts.forEach((post) => {
+      if (post.acfPosts.postsInThematic) {
+        post.acfPosts.postsInThematic.forEach((thematic) =>
+          thematics.push(getPageLinkFromRawData(thematic, 'thematic'))
+        );
+      }
+    });
+
+    const thematicsIds = thematics.map((thematic) => thematic.id);
+    const uniqueThematics = thematics.filter(
+      ({ id }, index) => !thematicsIds.includes(id, index + 1)
+    );
+    const sortThematicByName = (a: PageLink, b: PageLink) => {
+      var nameA = a.name.toUpperCase(); // ignore upper and lowercase
+      var nameB = b.name.toUpperCase(); // ignore upper and lowercase
+      if (nameA < nameB) {
+        return -1;
+      }
+      if (nameA > nameB) {
+        return 1;
+      }
+
+      // names must be equal
+      return 0;
+    };
+
+    return uniqueThematics.sort(sortThematicByName);
+  };
+
+  return {
+    content: contentParts.afterMore,
+    id: databaseId,
+    intro: contentParts.beforeMore,
+    meta: {
+      articles: acfTopics.postsInTopic.map((post) =>
+        getArticleFromRawData(post)
+      ),
+      cover: featuredImage?.node
+        ? getImageFromRawData(featuredImage.node)
+        : undefined,
+      dates: { publication: date, update: modified },
+      website: acfTopics.officialWebsite,
+      seo: {
+        description: seo?.metaDesc || '',
+        title: seo?.title || '',
+      },
+      thematics: getRelatedThematics(acfTopics.postsInTopic),
+      wordsCount: info.wordsCount,
+    },
+    slug,
+    title,
+  };
+};
+
+/**
+ * Retrieve a Topic object by slug.
+ *
+ * @param {string} slug - The topic slug.
+ * @returns {Promise<Article>} The requested topic.
+ */
+export const getTopicBySlug = async (slug: string): Promise<Topic> => {
+  const response = await fetchAPI<RawTopic, typeof topicBySlugQuery>({
+    api: getAPIUrl(),
+    query: topicBySlugQuery,
+    variables: { slug },
+  });
+
+  return getTopicFromRawData(response.topic);
+};
+
+/**
+ * Retrieve all the topics slugs.
+ *
+ * @returns {Promise<string[]>} - An array of topics slugs.
+ */
+export const getAllTopicsSlugs = async (): Promise<string[]> => {
+  const totalTopics = await getTotalTopics();
+  const response = await fetchAPI<Slug, typeof topicsSlugQuery>({
+    api: getAPIUrl(),
+    query: topicsSlugQuery,
+    variables: { first: totalTopics },
+  });
+
+  return response.topics.edges.map((edge) => edge.node.slug);
+};