1 files changed, 93 insertions, 2 deletions
diff --git a/src/services/CommentService.ts b/src/services/CommentService.ts
index 2faaa8db..6d71ce9c 100644
--- a/src/services/CommentService.ts
+++ b/src/services/CommentService.ts
@@ -1,8 +1,18 @@
 import AsyncStorage from '@react-native-community/async-storage';
 import {Alert} from 'react-native';
-import {COMMENTS_ENDPOINT, COMMENT_THREAD_ENDPOINT} from '../constants';
+import {
+  COMMENTS_ENDPOINT,
+  COMMENT_REACTIONS_ENDPOINT,
+  COMMENT_REACTIONS_REPLY_ENDPOINT,
+  COMMENT_THREAD_ENDPOINT,
+} from '../constants';
 import {ERROR_FAILED_TO_COMMENT} from '../constants/strings';
-import {CommentType} from '../types';
+import {
+  CommentThreadType,
+  CommentType,
+  ProfilePreviewType,
+  ReactionOptionsType,
+} from '../types';
 
 export const getComments = async (
   objectId: string,
@@ -116,3 +126,84 @@ export const deleteComment = async (id: string, isThread: boolean) => {
     return false;
   }
 };
+
+/**
+ * If `user_reaction` is undefined, we like the comment, if `user_reaction`
+ * is defined, we unlike the comment.
+ *
+ * @param comment the comment object that contains `user_reaction` (or not)
+ * @returns
+ */
+export const handleLikeUnlikeComment = async (
+  comment: CommentType | CommentThreadType,
+  liked: boolean,
+) => {
+  try {
+    const isReply = 'parent_comment' in comment;
+    const token = await AsyncStorage.getItem('token');
+    let url = isReply
+      ? COMMENT_REACTIONS_REPLY_ENDPOINT
+      : COMMENT_REACTIONS_ENDPOINT;
+    if (liked) {
+      // unlike a comment
+      url += `${comment.comment_id}/?reaction_type=LIKE`;
+      const response = await fetch(url, {
+        method: 'DELETE',
+        headers: {
+          Authorization: 'Token ' + token,
+        },
+      });
+      return response.status === 200;
+    } else {
+      // like a comment
+      const form = new FormData();
+      form.append('comment_id', comment.comment_id);
+      form.append('reaction_type', ReactionOptionsType.Like);
+      const response = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'multipart/form-data',
+          Authorization: 'Token ' + token,
+        },
+        body: form,
+      });
+      return response.status === 200;
+    }
+  } catch (error) {
+    console.log('Unable to like/unlike a comment');
+    console.error(error);
+  }
+};
+
+export const getUsersReactedToAComment = async (
+  comment: CommentType | CommentThreadType,
+) => {
+  try {
+    const isReply = 'parent_comment' in comment;
+    const token = await AsyncStorage.getItem('token');
+    let url = isReply
+      ? COMMENT_REACTIONS_REPLY_ENDPOINT
+      : COMMENT_REACTIONS_ENDPOINT;
+    url += `?comment_id=${comment.comment_id}`;
+    const response = await fetch(url, {
+      method: 'GET',
+      headers: {
+        Authorization: 'Token ' + token,
+      },
+    });
+    const typedResponse: {
+      reaction: ReactionOptionsType;
+      user_list: ProfilePreviewType[];
+    }[] = await response.json();
+    for (const obj of typedResponse) {
+      if (obj.reaction === ReactionOptionsType.Like) {
+        return obj.user_list;
+      }
+    }
+    return [];
+  } catch (error) {
+    console.log('Unable to fetch list of users whom reacted to a comment');
+    console.error(error);
+  }
+  return [];
+};