Qt: Allow rebinding keyboard controls (#779)

* Initial input UI draft

Co-Authored-By: Paris Oplopoios <parisoplop@gmail.com>

* More keybinding work

Co-Authored-By: Paris Oplopoios <parisoplop@gmail.com>

* Nit

Co-Authored-By: Paris Oplopoios <parisoplop@gmail.com>

* More nits

Co-Authored-By: Paris Oplopoios <parisoplop@gmail.com>

---------

Co-authored-by: Paris Oplopoios <parisoplop@gmail.com>

src/core/services/hid.cpp

@@ -1,6 +1,8 @@
 #include "services/hid.hpp"
 
-#include <bit>
+#include <algorithm>
+#include <cctype>
+#include <unordered_map>
 
 #include "ipc.hpp"
 #include "kernel.hpp"
@@ -242,4 +244,61 @@ void HIDService::updateInputs(u64 currentTick) {
 			kernel.signalEvent(e.value());
 		}
 	}
-}
+}
+
+// Key serialization helpers
+namespace HID::Keys {
+	const char* keyToName(u32 key) {
+		static std::unordered_map<u32, const char*> keyMap = {
+			{A, "A"},
+			{B, "B"},
+			{Select, "Select"},
+			{Start, "Start"},
+			{Right, "D-Pad Right"},
+			{Left, "D-Pad Left"},
+			{Up, "D-Pad Up"},
+			{Down, "D-Pad Down"},
+			{R, "R"},
+			{L, "L"},
+			{X, "X"},
+			{Y, "Y"},
+			{ZL, "ZL"},
+			{ZR, "ZR"},
+			{CirclePadRight, "CirclePad Right"},
+			{CirclePadLeft, "CirclePad Left"},
+			{CirclePadUp, "CirclePad Up"},
+			{CirclePadDown, "CirclePad Down"},
+		};
+
+		auto it = keyMap.find(key);
+		return it != keyMap.end() ? it->second : "Unknown key";
+	}
+
+	u32 nameToKey(std::string name) {
+		static std::unordered_map<std::string, u32> keyMap = {
+			{"a", A},
+			{"b", B},
+			{"select", Select},
+			{"start", Start},
+			{"d-pad right", Right},
+			{"d-pad left", Left},
+			{"d-pad up", Up},
+			{"d-pad down", Down},
+			{"r", R},
+			{"l", L},
+			{"x", X},
+			{"y", Y},
+			{"zl", ZL},
+			{"zr", ZR},
+			{"circlepad right", CirclePadRight},
+			{"circlepad left", CirclePadLeft},
+			{"circlepad up", CirclePadUp},
+			{"circlepad down", CirclePadDown},
+		};
+
+		std::transform(name.begin(), name.end(), name.begin(), [](char c) { return std::tolower(c); });
+		auto it = keyMap.find(name);
+
+		return it != keyMap.end() ? it->second : HID::Keys::Null;
+	}
+}  // namespace HID::Keys