Move all firbase dependencies from actions layer to firebaseService layer (#13)

app/firebaseServices/comments/CommentService.ts

@@ -3,15 +3,69 @@ import { firebaseRef, firebaseAuth } from 'app/firebase/'
 
 import { SocialError } from 'domain/common'
 import { ICommentService } from 'services/comments'
+import { Comment } from 'domain/comments'
 
 /**
  * Firbase comment service
- * 
+ *
  * @export
  * @class CommentService
  * @implements {ICommentService}
  */
 export class CommentService implements ICommentService {
+  public addComment: (postId: string, comment: Comment)
+    => Promise<string> = (postId, comment) => {
+      return new Promise<string>((resolve,reject) => {
+        let commentRef: any = firebaseRef.child(`postComments/${postId}`).push(comment)
+        commentRef.then(() => {
+          resolve(commentRef.key)
+        })
+        .catch((error: any) => {
+          reject(new SocialError(error.code,error.message))
+        })
+      })
+    }
 
+  public getComments: ()
+    => Promise<{ [postId: string]: { [commentId: string]: Comment } }> = () => {
+      return new Promise<{ [postId: string]: { [commentId: string]: Comment }}>((resolve,reject) => {
+        let commentsRef: any = firebaseRef.child(`postComments`)
+        commentsRef.on('value', (snapshot: any) => {
+          let comments: {[postId: string]: {[commentId: string]: Comment}} = snapshot!.val() || {}
+          resolve(comments)
+        })
+      })
+    }
 
-}
+  public updateComment: (userId: string, postId: string, comment: Comment)
+    => Promise<void> = (userId, postId, comment) => {
+      return new Promise<void>((resolve,reject) => {
+
+        let updates: any = {}
+        updates[`postComments/${postId}/${userId}`] = comment
+        firebaseRef.update(updates)
+        .then(() => {
+          resolve()
+        })
+        .catch((error: any) => {
+          reject(new SocialError(error.code,error.message))
+        })
+      })
+    }
+
+  public deleteComment: (commentId: string, postId: string)
+    => Promise<void> = (commentId, postId) => {
+      return new Promise<void>((resolve,reject) => {
+
+        let updates: any = {}
+        updates[`postComments/${postId}/${commentId}`] = null
+        firebaseRef.update(updates)
+          .then(() => {
+            resolve()
+          })
+          .catch((error: any) => {
+            reject(new SocialError(error.code,error.message))
+          })
+      })
+    }
+}