Wt version main.cpp

// Osman Zakir
// 4 / 4 / 2018
// currency_converter_app main.cpp
// This is a currency converter web application written in Wt.  The GUI is a Google Map with an info window that displays a form
// The form takes the user's input for what currencies to convert to and from, respectively, and the amount to convert.  The form submits
// to the executable made by this C++ code file

#include <Wt/WApplication.h>
#include <Wt/WServer.h>
#include <Wt/Http/Client.h>
#include <Wt/Http/Request.h>
#include <Wt/Http/Response.h>
#include <Wt/Json/Serializer.h>
#include <Wt/Json/Parser.h>
#include <Wt/Json/Array.h>
#include <Wt/Json/Object.h>
#include <Wt/Json/Value.h>
#include <Wt/WString.h>
#include <Wt/WEnvironment.h>
#include <Wt/WTemplate.h>
#include <Wt/WContainerWidget.h>
#include <Wt/WJavaScript.h>
#include <Wt/Utils.h>

class CurrencyConverterApp : public Wt::WApplication
{
public:
	CurrencyConverterApp(const Wt::WEnvironment &env);
private:
	double convert(const double amount, const std::string &to_currency);
};

int main(int argc, char *argv[])
{
	return Wt::WRun(argc, argv, [](const Wt::WEnvironment &env) {
		return std::make_unique<CurrencyConverterApp>(env);
	});
}

CurrencyConverterApp::CurrencyConverterApp(const Wt::WEnvironment &env)
	: Wt::WApplication{ env }
{
	std::string key;
	bool api_key = readConfigurationProperty("google_api_key", key);
	std::string urlencode_key = Wt::Utils::urlEncode(key);
	auto t = root()->addNew<Wt::WTemplate>();
	t->setTemplateText(
		"<div id=\"map\"></div>"
		"<script src=\"resources/scripts.js\" type=\"text/javascript\"></script>"
		"<script async defer src=\"https://maps.googleapis.com/maps/api/js?key=${urlencode_key}&callback=initMap\"></script>",
		Wt::TextFormat::UnsafeXHTML);
	t->bindString("urlencode_key", urlencode_key);
	setTitle("DragonOsman Currency Converter");
}

double CurrencyConverterApp::convert(const double amount, const std::string &to_currency)
{
	// TODO: Try to match passed in to_currency with array of supported currencies
	//       and do the conversion for the currency that checks out.  Return the result.
	return 0.0;
}