From 06f969b64eb05496474c1fefe4060e84ef3edcbb Mon Sep 17 00:00:00 2001
From: Daniel Lugo <danlugo92@gmail.com>
Date: Tue, 23 Jun 2020 19:26:53 -0400
Subject: [PATCH] wall getters

---
 services/gunDB/contact-api/getters/index.js |  1 +
 services/gunDB/contact-api/getters/wall.js  | 60 +++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 services/gunDB/contact-api/getters/wall.js

diff --git a/services/gunDB/contact-api/getters/index.js b/services/gunDB/contact-api/getters/index.js
index 54d80fd5..5074b5dd 100644
--- a/services/gunDB/contact-api/getters/index.js
+++ b/services/gunDB/contact-api/getters/index.js
@@ -89,3 +89,4 @@ const getMyUser = async () => {
 
 module.exports.getMyUser = getMyUser
 module.exports.Follows = require('./follows')
+module.exports.Wall = require('./wall')
diff --git a/services/gunDB/contact-api/getters/wall.js b/services/gunDB/contact-api/getters/wall.js
new file mode 100644
index 00000000..50824099
--- /dev/null
+++ b/services/gunDB/contact-api/getters/wall.js
@@ -0,0 +1,60 @@
+/**
+ * @format
+ */
+const Common = require('shock-common')
+const Utils = require('../utils')
+const Key = require('../key')
+
+/**
+ * @returns {Promise<number>}
+ */
+const getTotalPages = () =>
+  /** @type {Promise<number>} */ (Utils.tryAndWait(
+    (_, user) =>
+      user
+        .get(Key.WALL)
+        .get(Key.NUM_OF_PAGES)
+        .then(),
+    v => typeof v !== 'number'
+  ))
+
+/**
+ * Won't fail if given an invalid page, will return an empty set.
+ * @param {number} page
+ * @returns {Promise<Common.SchemaTypes.WallPage>}
+ */
+const getWallPage = async page => {
+  const totalPages = await getTotalPages()
+  const empty = {
+    count: 0,
+    posts: {}
+  }
+
+  if (page === 0) {
+    return empty
+  }
+
+  const actualPageIdx = page < 0 ? totalPages + (page + 1) : page - 1
+
+  const thePage = await Utils.tryAndWait(
+    (_, user) =>
+      new Promise(res => {
+        user
+          .get(Key.WALL)
+          .get(Key.PAGES)
+          .get(actualPageIdx.toString())
+          .load(res)
+      })
+  )
+
+  if (Common.Schema.isWallPage(thePage)) {
+    return thePage
+  }
+
+  return empty
+}
+
+module.exports = {
+  getTotalPages,
+  getWallPage
+}