From c6767e24f5d8d9624f79b6ac952b576008c5845a Mon Sep 17 00:00:00 2001
From: Michael Diego <6419886+itsmichaeldiego@users.noreply.github.com>
Date: Wed, 3 Apr 2019 10:19:42 -0300
Subject: [PATCH] Revert "Google Map loader respecting the app language change
 (#726)" (#738)

This reverts commit 55fd1b06a375e2126e8dea95d5f32943f4009553.
---
 package.json                     |   3 +-
 src/loaders/google_map_loader.js | 132 +++++++++++++++----------------
 yarn.lock                        |   4 +
 3 files changed, 71 insertions(+), 68 deletions(-)

diff --git a/package.json b/package.json
index 1dbf088..5a25b54 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,8 @@
   },
   "dependencies": {
     "@mapbox/point-geometry": "^0.1.0",
-    "eventemitter3": "^1.1.0"
+    "eventemitter3": "^1.1.0",
+    "scriptjs": "^2.5.7"
   },
   "devDependencies": {
     "autoprefixer": "^6.3.6",
diff --git a/src/loaders/google_map_loader.js b/src/loaders/google_map_loader.js
index 676d758..ce29d73 100644
--- a/src/loaders/google_map_loader.js
+++ b/src/loaders/google_map_loader.js
@@ -1,89 +1,87 @@
 const BASE_URL = 'https://maps';
 const DEFAULT_URL = `${BASE_URL}.googleapis.com`;
-const API_PATH = '/maps/api/js?callback=googleMapsAPILoadedPromise';
-const EVENT_GMAPS_LOADED = 'EVENT_GMAPS_LOADED';
+const API_PATH = '/maps/api/js?callback=_$_google_map_initialize_$_';
 
-const getBaseUrl = region => {
+const getUrl = region => {
   if (region && region.toLowerCase() === 'cn') {
     return `${BASE_URL}.google.cn`;
   }
   return DEFAULT_URL;
 };
 
-let currentResolver = null;
-let lastBaseUrl = '';
-let lastScriptUrl = '';
-let googleMapsPromise;
+let $script_ = null;
 
-const destroyOldGoogleMapsInstance = url => {
-  document
-    .querySelectorAll(`script[src^='${url}']`)
-    .forEach(script => script.remove());
-  if (window.google) delete window.google.maps;
-};
+let loadPromise_;
 
-// Callback for the Google Maps API src
-window.googleMapsAPILoadedPromise = () =>
-  window.dispatchEvent(new CustomEvent(EVENT_GMAPS_LOADED));
+let resolveCustomPromise_;
 
-const getScriptUrl = bootstrapURLKeys => {
-  const baseUrl = getBaseUrl(bootstrapURLKeys.region);
-  const params = Object.keys(bootstrapURLKeys).reduce(
-    (r, key) => `${r}&${key}=${bootstrapURLKeys[key]}`,
-    ''
-  );
-  return `${baseUrl}${API_PATH}${params}`;
-};
+const _customPromise = new Promise(resolve => {
+  resolveCustomPromise_ = resolve;
+});
 
-const loadScript = url => {
-  const script = document.createElement('script');
+// TODO add libraries language and other map options
+export default (bootstrapURLKeys, heatmapLibrary) => {
+  if (!$script_) {
+    $script_ = require('scriptjs'); // eslint-disable-line
+  }
 
-  script.type = 'text/javascript';
-  script.async = true;
-  script.src = url;
-  document.querySelector('head').appendChild(script);
+  // call from outside google-map-react
+  // will be as soon as loadPromise_ resolved
+  if (!bootstrapURLKeys) {
+    return _customPromise;
+  }
 
-  return new Promise(resolve => {
-    if (currentResolver) {
-      window.removeEventListener(EVENT_GMAPS_LOADED, currentResolver);
+  if (loadPromise_) {
+    return loadPromise_;
+  }
+
+  loadPromise_ = new Promise((resolve, reject) => {
+    if (typeof window === 'undefined') {
+      reject(new Error('google map cannot be loaded outside browser env'));
+      return;
     }
-    currentResolver = () => {
-      resolve();
+
+    if (window.google && window.google.maps) {
+      resolve(window.google.maps);
+      return;
+    }
+
+    if (typeof window._$_google_map_initialize_$_ !== 'undefined') {
+      reject(new Error('google map initialization error'));
+    }
+
+    window._$_google_map_initialize_$_ = () => {
+      delete window._$_google_map_initialize_$_;
+      resolve(window.google.maps);
     };
-    window.addEventListener(EVENT_GMAPS_LOADED, currentResolver);
-  });
-};
 
-const loadGoogleMaps = bootstrapURLKeys =>
-  new Promise(async resolve => {
-    lastScriptUrl = getScriptUrl(bootstrapURLKeys);
-    await loadScript(lastScriptUrl);
-    resolve(window.google.maps);
+    if (process.env.NODE_ENV !== 'production') {
+      if (Object.keys(bootstrapURLKeys).indexOf('callback') > -1) {
+        const message = `"callback" key in bootstrapURLKeys is not allowed,
+                          use onGoogleApiLoaded property instead`;
+        // eslint-disable-next-line no-console
+        console.error(message);
+        throw new Error(message);
+      }
+    }
+
+    const params = Object.keys(bootstrapURLKeys).reduce(
+      (r, key) => `${r}&${key}=${bootstrapURLKeys[key]}`,
+      ''
+    );
+
+    const baseUrl = getUrl(bootstrapURLKeys.region);
+    const libraries = heatmapLibrary ? '&libraries=visualization' : '';
+
+    $script_(
+      `${baseUrl}${API_PATH}${params}${libraries}`,
+      () =>
+        typeof window.google === 'undefined' &&
+        reject(new Error('google map initialization error (not loaded)'))
+    );
   });
 
-export default bootstrapURLKeys => {
-  if (typeof window === 'undefined') {
-    throw new Error('google map cannot be loaded outside browser env');
-  }
+  resolveCustomPromise_(loadPromise_);
 
-  if (process.env.NODE_ENV !== 'production') {
-    if (Object.keys(bootstrapURLKeys).includes('callback')) {
-      const message = `'callback' key in bootstrapURLKeys is not allowed, use onGoogleapiLoadedPromise property instead`;
-      // eslint-disable-next-line no-console
-      console.error(message);
-      throw new Error(message);
-    }
-  }
-  if (googleMapsPromise) {
-    if (lastScriptUrl !== getScriptUrl(bootstrapURLKeys)) {
-      destroyOldGoogleMapsInstance(lastBaseUrl);
-      googleMapsPromise = loadGoogleMaps(bootstrapURLKeys);
-    }
-    return googleMapsPromise;
-  }
-
-  googleMapsPromise = loadGoogleMaps(bootstrapURLKeys);
-  lastBaseUrl = getBaseUrl(bootstrapURLKeys.region);
-
-  return googleMapsPromise;
+  return loadPromise_;
 };
diff --git a/yarn.lock b/yarn.lock
index 6c768ce..378cdd0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4989,6 +4989,10 @@ sax@^1.2.4, sax@~1.2.1:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
 
+scriptjs@^2.5.7:
+  version "2.5.8"
+  resolved "https://registry.yarnpkg.com/scriptjs/-/scriptjs-2.5.8.tgz#d0c43955c2e6bad33b6e4edf7b53b8965aa7ca5f"
+
 scss-tokenizer@^0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/scss-tokenizer/-/scss-tokenizer-0.2.3.tgz#8eb06db9a9723333824d3f5530641149847ce5d1"