From 86fcff1e5eaa7189cec7477877872f496d4a513d Mon Sep 17 00:00:00 2001
From: Nathan Booker <nathan.booker@bigcommerce.com>
Date: Sat, 29 Jun 2019 17:46:38 -0500
Subject: [PATCH] Add "localizePrice" helper

---
 helpers/lib/icu-detect.js     | 15 ++++++++++++
 helpers/localizePrice.js      | 46 +++++++++++++++++++++++++++++++++++
 spec/helpers.js               |  1 +
 spec/helpers/localizePrice.js | 40 ++++++++++++++++++++++++++++++
 4 files changed, 102 insertions(+)
 create mode 100644 helpers/lib/icu-detect.js
 create mode 100644 helpers/localizePrice.js
 create mode 100644 spec/helpers/localizePrice.js

diff --git a/helpers/lib/icu-detect.js b/helpers/lib/icu-detect.js
new file mode 100644
index 00000000..20d98dcf
--- /dev/null
+++ b/helpers/lib/icu-detect.js
@@ -0,0 +1,15 @@
+'use strict';
+
+const hasFullICU = (() => {
+    try {
+        const january = new Date(9e8);
+        const spanish = new Intl.DateTimeFormat('es', { month: 'long' });
+        return spanish.format(january) === 'enero';
+    } catch (err) {
+        return false;
+    }
+})();
+
+module.exports = {
+    hasFullICU
+};
diff --git a/helpers/localizePrice.js b/helpers/localizePrice.js
new file mode 100644
index 00000000..6a2e6bd6
--- /dev/null
+++ b/helpers/localizePrice.js
@@ -0,0 +1,46 @@
+'use strict';
+const utils = require('handlebars-utils');
+// Detect ICU support
+const { hasFullICU } = require('./lib/icu-detect.js');
+
+const factory = () => {
+    return function(price, locale) {
+        if (!utils.isObject(price) || !utils.isString(price.currency)
+            || isNaN(price.value) || !utils.isString(price.formatted)) {
+            // Return empty string if this does not appear to be a price object
+            return '';
+        }
+
+        if (!utils.isString(locale) || locale.length < 2) {
+            // Valid browser language strings are at least two characters
+            // https://www.metamodpro.com/browser-language-codes
+            // If provided locale is less than two characters (or not a string),
+            // return the normal formatted price
+            return price.formatted;
+        }
+
+        // If the if full ICU is not installed, fall back to normal price
+        if (!hasFullICU){
+            return price.formatted;
+        }
+
+        // Try to format the price to the provided locale,
+        // but if anything goes wrong,
+        // just return the usual price
+        // Could happen if the full ICU is not installed,
+        // or if an invalid locale is provided.
+        try {
+            return new Intl.NumberFormat(
+                locale, { style: 'currency', currency: price.currency}
+            ).format(price.value);
+        }
+        catch (err){
+            return price.formatted;
+        }
+    };
+};
+
+module.exports = [{
+    name: 'localizePrice',
+    factory: factory,
+}];
diff --git a/spec/helpers.js b/spec/helpers.js
index deb26835..fb89a60e 100644
--- a/spec/helpers.js
+++ b/spec/helpers.js
@@ -50,6 +50,7 @@ describe('helper registration', () => {
             'lang',
             'langJson',
             'limit',
+            'localizePrice',
             'money',
             'nl2br',
             'occurrences',
diff --git a/spec/helpers/localizePrice.js b/spec/helpers/localizePrice.js
new file mode 100644
index 00000000..e1a0619d
--- /dev/null
+++ b/spec/helpers/localizePrice.js
@@ -0,0 +1,40 @@
+require('full-icu');
+
+const Lab = require('lab'),
+      lab = exports.lab = Lab.script(),
+      describe = lab.experiment,
+      it = lab.it,
+      specHelpers = require('../spec-helpers'),
+      testRunner = specHelpers.testRunner
+
+describe('localizePrice helper', function() {
+    const context = {
+        "price": {
+            "tax_label": "GST",
+            "without_tax": {
+                "currency": "USD",
+                "formatted": "$123,456.78",
+                "value": 123456.78
+            }
+        }
+    };
+
+    const runTestCases = testRunner({context});
+
+    it('should return return correct prices across a number of locales', function(done) {
+        runTestCases([
+            {
+                input: '{{localizePrice price.without_tax "en-US"}}',
+                output: '$123,456.78',
+            },
+            {
+                input: '{{localizePrice price.without_tax "ja-JP"}}',
+                output: '$123,456.78',
+            },
+            {
+                input: '{{localizePrice price.without_tax "de"}}',
+                output: '123.456,78 $',
+            },
+        ], done);
+    });
+});