Update hard-coded currency UI with currency specific params (#488)

* Update hard-coded currency UI with currency specific params

* Rename extension methods to match currency option names; Move cents extension to numeric class extension

* Use currency's precision to show the cents part in accounts show page

---------

Co-authored-by: Sriram Krishnan <sriram@seafoodsouq.com>

config/initializers/constants.rb

@@ -12,7 +12,7 @@ CURRENCY_OPTIONS = Hash.new { |hash, key| hash[key] = default_currency_options.d
   "NZD": { unit: "NZ$", precision: 2, delimiter: ",", separator: "." },
   "AUD": { unit: "A$", precision: 2, delimiter: ",", separator: "." },
   "KRW": { unit: "₩", precision: 0, delimiter: ",", separator: "." },
-  "INR": { unit: "₹", precision: 0, delimiter: ",", separator: "." }
+  "INR": { unit: "₹", precision: 2, delimiter: ",", separator: "." }
 )
 
 EXCHANGE_RATE_ENABLED = ENV["OPEN_EXCHANGE_APP_ID"].present?

config/initializers/numeric_extensions.rb

@@ -0,0 +1,11 @@
+class Numeric
+  def cents(precision: 2)
+    return "" unless precision.positive?
+
+    cents = self.to_s.split(".")[1]
+    cents = "" unless cents.to_i.positive?
+
+    zero_padded_cents = cents.ljust(precision, "0")
+    zero_padded_cents[0..precision - 1]
+  end
+end

config/initializers/string_extensions.rb

@@ -0,0 +1,13 @@
+class String
+  def unit
+    CURRENCY_OPTIONS[self.to_sym][:unit]
+  end
+
+  def separator
+    CURRENCY_OPTIONS[self.to_sym][:separator]
+  end
+
+  def precision
+    CURRENCY_OPTIONS[self.to_sym][:precision]
+  end
+end