practice-tracker/server.cpp

#include "crow.h"
#include "crow/middlewares/cors.h"

#include <driver.h>
#include <statement.h>

using namespace sql;
using namespace std;

Driver *driver;
Connection *con;
Statement *stmt;

void exiting(){
	delete con;
	delete stmt;
}

void connect(){
	con = driver->connect(getenv("DBURL"),getenv("DBUSER"),getenv("DBPWD"));
	con->setSchema("practice");
	stmt = con->createStatement();
}

int main()
{
	crow::App<crow::CORSHandler> app;

	driver = get_driver_instance();

	CROW_ROUTE(app, "/categories")([](){
		connect();
		crow::json::wvalue entries;

		ResultSet *res = stmt->executeQuery("SELECT practice_categories.id, practice_categories.name AS category, instruments.name AS instrument FROM practice_categories JOIN instruments ON practice_categories.instrument_id = instruments.id ORDER BY instruments.name ASC, category ASC");

		int i = 0;
		while (res->next()) {
			int id = res->getInt("id");
			string category = res->getString("category");
			string instrument = res->getString("instrument");
			entries[i] = {{"id", id}, {"category", category}, {"instrument", instrument}};
			i++;
		}

		delete res;
		return entries;
	});

	CROW_ROUTE(app, "/summary")([](){
		connect();
		crow::json::wvalue entries;

		ResultSet *res = stmt->executeQuery("SELECT * FROM summary ORDER BY chunks_practiced ASC;");

		int i = 0;
		while (res->next()) {
			int category_id = res->getInt("category_id");
			string category = res->getString("category");
			string instrument = res->getString("instrument");
			double chunks_practiced = res->getDouble("chunks_practiced"); 
			int weight = res->getInt("weight");
			entries[i] = {{"category_id", category_id}, {"category", category}, {"instrument", instrument}, {"chunks_practiced", chunks_practiced}, {"weight", weight}};
			i++;
		}

		delete res;
		return entries;
	});

	CROW_ROUTE(app, "/mins-left-to-practice-today")([](){
		connect();
		crow::json::wvalue entries;

		ResultSet *res = stmt->executeQuery("SELECT * FROM mins_left_to_practice_today;");

		res->next();
		double time_left = res->getDouble("time_left"); 
		entries = {{"time_left", time_left}};

		delete res;
		return entries;
	});

	CROW_ROUTE(app, "/show-category/<int>")([](int category_id){
		connect();
		crow::json::wvalue entries;

		ResultSet *res = stmt->executeQuery("call show_category("+to_string(category_id)+");");

		int i = 0;
		res->afterLast();
		while (res->previous()) {
			int id = res->getInt("id");
			string description = res->getString("description");
			int seconds = res->getInt("seconds");
			string comments = res->getString("comments");
			string created_at = res->getString("created_at");
			int category_id = res->getInt("category_id");
			string category = res->getString("category");
			string instrument = res->getString("instrument");
			entries[i] = {
				{"id", id},
				{"description", description},
				{"seconds", seconds},
				{"comments", comments},
				{"created_at", created_at},
				{"category_id", category_id},
				{"category", category},
				{"instrument", instrument}
			};
			i++;
		}

		delete res;
		return entries;
	});

	app.port(18080).run();

	atexit(exiting);
}