From 4b18989fefba1f80c5788325b0f7e9906b5ac48b Mon Sep 17 00:00:00 2001
From: dave <starpumadev@gmail.com>
Date: Sat, 9 Feb 2019 23:05:23 -0500
Subject: #332 - add follow/not follow button to follow list

---
 .../follow_manipulate/follow_manipulate.js         | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 src/services/follow_manipulate/follow_manipulate.js

(limited to 'src/services')

diff --git a/src/services/follow_manipulate/follow_manipulate.js b/src/services/follow_manipulate/follow_manipulate.js
new file mode 100644
index 00000000..1e9bd679
--- /dev/null
+++ b/src/services/follow_manipulate/follow_manipulate.js
@@ -0,0 +1,74 @@
+const fetchUser = (attempt, user, store) => new Promise((resolve, reject) => {
+  setTimeout(() => {
+    store.state.api.backendInteractor.fetchUser({ id: user.id })
+      .then((user) => store.commit('addNewUsers', [user]))
+      .then(() => resolve([user.following, attempt]))
+      .catch((e) => reject(e))
+  }, 500)
+}).then(([following, attempt]) => {
+  if (!following && attempt <= 3) {
+    // If we BE reports that we still not following that user - retry,
+    // increment attempts by one
+    return fetchUser(++attempt, user, store)
+  } else {
+    // If we run out of attempts, just return whatever status is.
+    return following
+  }
+})
+
+export const requestFollow = (user, store) => new Promise((resolve, reject) => {
+  store.state.api.backendInteractor.followUser(user.id)
+    .then((updated) => {
+      store.commit('addNewUsers', [updated])
+
+      // For locked users we just mark it that we sent the follow request
+      if (updated.locked) {
+        resolve({
+          sent: true,
+          updated
+        })
+      }
+
+      if (updated.following) {
+        // If we get result immediately, just stop.
+        resolve({
+          sent: false,
+          updated
+        })
+      }
+
+      // But usually we don't get result immediately, so we ask server
+      // for updated user profile to confirm if we are following them
+      // Sometimes it takes several tries. Sometimes we end up not following
+      // user anyway, probably because they locked themselves and we
+      // don't know that yet.
+      // Recursive Promise, it will call itself up to 3 times.
+
+      return fetchUser(1, user, store)
+        .then((following) => {
+          if (following) {
+            // We confirmed and everything's good.
+            resolve({
+              sent: false,
+              updated
+            })
+          } else {
+            // If after all the tries, just treat it as if user is locked
+            resolve({
+              sent: false,
+              updated
+            })
+          }
+        })
+    })
+})
+
+export const requestUnfollow = (user, store) => new Promise((resolve, reject) => {
+  store.state.api.backendInteractor.unfollowUser(user.id)
+    .then((updated) => {
+      store.commit('addNewUsers', [updated])
+      resolve({
+        updated
+      })
+    })
+})
-- 
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