#currency one page app

##features

• Check current rate of every given currency against any other currency of the user’s choice
• Visualise the historical change in rate between any two dates of the user’s choice, against any currency of the user’s choice
• Calculate retrospective purchasing outcomes, for example: If I had purchased £200 worth of CAD in September 2008, how much CAD would I have today?

##usage

git clone
node index.js

visit localhost:3000/currencies to use the application

Alternatively currency-one-page-app.html could be deployed standalone.

##development

###technology

• Node.js, angular and Bootstrap.
• https://exchangeratesapi.io/ (Foreign Exchange Rates API, as requested)
• CDN usage to create the simplest possible solution

###progress

• Initially this Node.js code was committed to provide a module free handler for our application
• Started with a file reader to store the users preference and then realised this would need authentication
• After this commit I started to look at users and authentication, then as this is "needed" I moved on to look at templating
• While looking at templating I decided to use angular and keep this as pure JavaScript as possible and as I've already made it clear I can use the package manager... maybe I can complete without?
• Templating and users were not needed so I returned to focus on the main requirements and started to use angular in a single test html to develop this
• Despite focus not on presentation I like to use an application that looks appealing so I added basic bootstrap, flags, currency symbol and basic table styling
• If I had purchased £200 worth of CAD in September 2008, how much CAD would I have today?
• noticed that I'd only done the calculation at load time, added call so that any param changed updates the value
• Noticed limitations of the API, would suggest using a different one that client request (no rates before 2000 start of ECB/EUR?; cannot get rates certain rate dates; AFAIK ECB updates the rates daily)
• linked currency-one-page-app.html to the simple Node.js server/router
• many smaller refactors and comments - added this readme.md instead of a comment in index.js
• fixed many cases of retrospective purchasing failures... instead of requesting the rate on the first of the month, request for the whole month and use the first returned

###todo

• html5 dates are not friendly (or respecting min/max) so replace with month/year dropdowns
• automated testing to ensure the current calculation is correct
• error handling of failed api calls
• improve graph: series colours; title; better axis;
• add currency and country names, not just codes
• add a select for base currency at the top of the page
• order currencies alphbetically
• add another retrospective purchasing outcome, if I brought that amount every month since that date
• add another graph for the above retrospective purchasing outcome
• how much would GBP 226 have purchased in CAD if purchased in September 2008
• caching of results (as pre api provider request) also improve performance ability to work as PWA
• User authentication (sign up, manage profile, login, logout, etc) to store their base currency - requires routing and auth