refactor big contact

src/chat_gui/theme.hpp

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <imgui/imgui.h>
+
+#include <entt/container/dense_map.hpp>
+#include <entt/core/type_info.hpp>
+
+#include <string>
+#include <type_traits>
+
+// default is resolving to its value
+template<typename T>
+std::string typeValueName(T V) {
+	return std::to_string(static_cast<std::underlying_type_t<T>>(V));
+}
+
+// stores theming values and colors not expressed by imgui directly
+struct Theme {
+	using key_type = entt::id_type;
+
+	entt::dense_map<key_type, ImVec4> colors;
+	entt::dense_map<key_type, std::string> colors_name;
+
+	// TODO: spec out dependencies
+
+	// TODO: what for
+	entt::dense_map<key_type, float> single_values;
+
+	std::string name; // theme name
+
+	Theme(void);
+
+	// call when any color changed, so dependencies can be resolved
+	void update(void);
+
+	template<auto V>
+	void setColor(ImVec4 color) {
+		constexpr auto key = entt::type_hash<entt::tag<V>>::value();
+		colors[key] = color;
+
+		if (!colors_name.contains(key)) {
+			std::string key_name = static_cast<std::string>(
+				entt::type_name<decltype(V)>::value()
+			) + ":" + typeValueName(V);
+			colors_name[key] = key_name;
+		}
+	}
+	template<auto V>
+	ImVec4 getColor(void) const {
+		constexpr auto key = entt::type_hash<entt::tag<V>>::value();
+		const auto it = colors.find(key);
+		if (it != colors.end()) {
+			return it->second;
+		} else {
+			return {}; // TODO: pink as default?
+		}
+	}
+
+	template<auto V>
+	std::string_view getColorName(void) const {
+		constexpr auto key = entt::type_hash<entt::tag<V>>::value();
+		if (colors_name.contains(key)) {
+			return colors_name.at(key);
+		} else {
+			return "unk";
+		}
+	}
+
+	// TODO: actually serialize from config?
+	bool load(void);
+	bool store(void);
+};
+
+Theme getDefaultThemeDark(void);
+Theme getDefaultThemeLight(void);
+