Added payment and basic deduction and increase of cash

src/CommandEvents.cpp

@@ -1,20 +1,67 @@
 #include "Base/SQL.hpp"
 #include "Commands.hpp"
+#include <cstdint>
+#include <dpp/dispatcher.h>
 #include <dpp/snowflake.h>
+#include <string>
 
 void commandPing(const dpp::slashcommand_t &event) { event.reply("Pong"); }
 void commandBalance(const dpp::slashcommand_t &event) {
-  dpp::snowflake userid = event.command.get_issuing_user().id;
+  std::string balance = getUserBalance(event.command.get_issuing_user().id);
+  event.reply(COMMAND_BALANCE_RESPONSE(balance));
+}
+
+void commandPay(const dpp::slashcommand_t &event) {
+  std::string recipient =
+      std::get<dpp::snowflake>(event.get_parameter("recipient")).str();
+  std::uint64_t amount = std::get<std::int64_t>(event.get_parameter("amount"));
+
+  // See if we can deduct the payment first
+  if (!deductFromUsersBalance(event.command.get_issuing_user().id, amount)) {
+    event.reply(COMMAND_PAY_FAIL_INSUFFICIENT_AMOUNT(recipient,
+                                                     std::to_string(amount)));
+    return;
+  }
+
+  // Lets pay them
+  increaseFromUsersBalance(recipient, amount);
+  event.reply(COMMAND_PAY_SUCCESS(recipient, std::to_string(amount)));
+}
+
+inline void increaseFromUsersBalance(const dpp::snowflake userid,
+                                     std::uint64_t amount) {
+  std::uint64_t balance = std::stoi(getUserBalance(userid));
+  execSQL("UPDATE MONEY SET CASH=" + std::to_string(balance + amount) +
+          " WHERE UID=" + userid.str());
+}
+
+inline bool deductFromUsersBalance(const dpp::snowflake userid,
+                                   std::uint64_t amount) {
+  std::uint64_t balance = std::stoi(getUserBalance(userid));
+  if (balance < amount) {
+    return false;
+  }
+
+  execSQL("UPDATE MONEY SET CASH=" + std::to_string(balance - amount) +
+          " WHERE UID=" + userid.str());
+
+  return true;
+}
+
+inline std::string getUserBalance(const dpp::snowflake userid) {
   std::string balance;
   execSQL("SELECT CASH FROM MONEY WHERE UID=" + userid.str(), &balance);
 
   if (balance.empty()) {
-    execSQL("INSERT INTO MONEY (UID) VALUES (" + userid.str() + ");");
+    addUserToDatabase(userid);
     balance = "0";
   } else {
     std::uint8_t begining = balance.find(':') + 1;
     balance = balance.substr(begining, balance.find(';') - begining);
   }
-
-  event.reply(COMMAND_BALANCE_RESPONSE(balance));
+  return balance;
+}
+
+inline void addUserToDatabase(const dpp::snowflake userid) {
+  execSQL("INSERT INTO MONEY (UID) VALUES (" + userid.str() + ");");
 }