1 files changed, 303 insertions, 16 deletions
diff --git a/src/services/graphql/api.ts b/src/services/graphql/api.ts
index a5be026..009aea4 100644
--- a/src/services/graphql/api.ts
+++ b/src/services/graphql/api.ts
@@ -1,25 +1,312 @@
-import { RequestType, VariablesType } from '@ts/types/app';
 import { settings } from '@utils/config';
-import { GraphQLClient } from 'graphql-request';
+import {
+  articleBySlugQuery,
+  articlesCardQuery,
+  articlesEndCursor,
+  articlesQuery,
+  articlesSlugQuery,
+  totalArticlesQuery,
+} from './articles.query';
+import { sendCommentMutation } from './comments.mutation';
+import { commentsQuery } from './comments.query';
+import { sendMailMutation } from './contact.mutation';
+import {
+  thematicBySlugQuery,
+  thematicsListQuery,
+  thematicsSlugQuery,
+  totalThematicsQuery,
+} from './thematics.query';
+import {
+  topicBySlugQuery,
+  topicsListQuery,
+  topicsSlugQuery,
+  totalTopicsQuery,
+} from './topics.query';
 
-export const getGraphQLClient = (): GraphQLClient => {
-  const apiUrl = settings.api.url;
+export type Mutations = typeof sendMailMutation | typeof sendCommentMutation;
 
-  if (!apiUrl) throw new Error('API URL not defined.');
+export type Queries =
+  | typeof articlesQuery
+  | typeof articleBySlugQuery
+  | typeof articlesCardQuery
+  | typeof articlesEndCursor
+  | typeof articlesSlugQuery
+  | typeof commentsQuery
+  | typeof thematicBySlugQuery
+  | typeof thematicsListQuery
+  | typeof thematicsSlugQuery
+  | typeof topicBySlugQuery
+  | typeof topicsListQuery
+  | typeof topicsSlugQuery
+  | typeof totalArticlesQuery
+  | typeof totalThematicsQuery
+  | typeof totalTopicsQuery;
 
-  return new GraphQLClient(apiUrl);
+export type ArticleResponse<T> = {
+  post: T;
 };
 
-export const fetchApi = async <T extends RequestType>(
-  query: string,
-  variables: VariablesType<T>
-): Promise<T> => {
-  const client = getGraphQLClient();
+export type ArticlesResponse<T> = {
+  posts: T;
+};
+
+export type CommentsResponse<T> = {
+  comments: T;
+};
+
+export type SendCommentResponse<T> = {
+  createComment: T;
+};
+
+export type SendMailResponse<T> = {
+  sendEmail: T;
+};
 
-  try {
-    return await client.request(query, variables);
-  } catch (error) {
-    console.error(error, undefined, 2);
-    process.exit(1);
+export type ThematicResponse<T> = {
+  thematic: T;
+};
+
+export type ThematicsResponse<T> = {
+  thematics: T;
+};
+
+export type TopicResponse<T> = {
+  topic: T;
+};
+
+export type TopicsResponse<T> = {
+  topics: T;
+};
+
+export type PageInfo = {
+  endCursor: string;
+  hasNextPage: boolean;
+  total: number;
+};
+
+export type Edges<T> = {
+  cursor: string;
+  node: T;
+};
+
+export type EdgesResponse<T> = {
+  edges: Edges<T>[];
+  pageInfo: PageInfo;
+};
+
+export type NodeResponse<T> = {
+  node: T;
+};
+
+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>>;
+  [sendCommentMutation]: SendCommentResponse<T>;
+  [sendMailMutation]: SendMailResponse<T>;
+  [thematicBySlugQuery]: ThematicResponse<T>;
+  [thematicsListQuery]: ThematicsResponse<EdgesResponse<T>>;
+  [thematicsSlugQuery]: ThematicsResponse<EdgesResponse<T>>;
+  [topicBySlugQuery]: TopicResponse<T>;
+  [topicsListQuery]: TopicsResponse<EdgesResponse<T>>;
+  [topicsSlugQuery]: TopicsResponse<EdgesResponse<T>>;
+  [totalArticlesQuery]: ArticlesResponse<T>;
+  [totalThematicsQuery]: ThematicsResponse<T>;
+  [totalTopicsQuery]: TopicsResponse<T>;
+};
+
+export type GraphQLResponse<
+  T extends keyof ResponseMap<U>,
+  U
+> = ResponseMap<U>[T];
+
+export type BySlugVar = {
+  /**
+   * A slug.
+   */
+  slug: string;
+};
+
+export type EdgesVars = {
+  /**
+   * A cursor.
+   */
+  after?: string;
+  /**
+   * The number of items to return.
+   */
+  first: number;
+  /**
+   * A search query.
+   */
+  search?: string;
+};
+
+export type ByContentIdVar = {
+  /**
+   * An article id.
+   */
+  contentId: number;
+};
+
+export type SearchVar = {
+  /**
+   * A search term.
+   */
+  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;
+};
+
+export type VariablesMap = {
+  [articleBySlugQuery]: BySlugVar;
+  [articlesCardQuery]: EdgesVars;
+  [articlesEndCursor]: EdgesVars;
+  [articlesQuery]: EdgesVars;
+  [articlesSlugQuery]: EdgesVars;
+  [commentsQuery]: ByContentIdVar;
+  [sendCommentMutation]: SendCommentVars;
+  [sendMailMutation]: SendMailVars;
+  [thematicBySlugQuery]: BySlugVar;
+  [thematicsListQuery]: EdgesVars;
+  [thematicsSlugQuery]: EdgesVars;
+  [topicBySlugQuery]: BySlugVar;
+  [topicsListQuery]: EdgesVars;
+  [topicsSlugQuery]: EdgesVars;
+  [totalArticlesQuery]: SearchVar;
+  [totalThematicsQuery]: null;
+  [totalTopicsQuery]: null;
+};
+
+export type FetchAPIProps<T extends Queries | Mutations> = {
+  /**
+   * A GraphQL API URL.
+   */
+  api: string;
+  /**
+   * A GraphQL query.
+   */
+  query: T;
+  /**
+   * (Optional) The query variables.
+   */
+  variables?: VariablesMap[T];
+};
+
+/**
+ * Fetch a GraphQL API.
+ * @param {object} obj - An object.
+ * @param {string} obj.api - A GraphQL API URL.
+ * @param {Queries} obj.query - A GraphQL query.
+ * @param {object} [obj.variables] - The query variables.
+ */
+export async function fetchAPI<T, U extends Queries | Mutations>({
+  api,
+  query,
+  variables,
+}: FetchAPIProps<U>): Promise<GraphQLResponse<U, T>> {
+  const response = await fetch(api, {
+    method: 'POST',
+    headers: {
+      'content-type': 'application/json;charset=UTF-8',
+    },
+    body: JSON.stringify({
+      query,
+      variables,
+    }),
+  });
+
+  type JSONResponse = {
+    data?: GraphQLResponse<U, T>;
+    errors?: Array<{ message: string }>;
+  };
+
+  const { data, errors }: JSONResponse = await response.json();
+
+  if (response.ok) {
+    if (!data) return Promise.reject(new Error(`No data found"`));
+
+    return data;
+  } else {
+    console.error('Failed to fetch API');
+    const error = new Error(
+      errors?.map((e) => e.message).join('\n') ?? 'unknown'
+    );
+    return Promise.reject(error);
+  }
+}
+
+/**
+ * Retrieve the API url from settings.
+ *
+ * @returns {string} The API url.
+ */
+export const getAPIUrl = (): string => {
+  const { url } = settings.api;
+
+  if (!url) {
+    throw new Error('API url is not defined.');
   }
+
+  return url;
 };